./Ultimate.py --spec ../../sv-benchmarks/c/properties/unreach-call.prp --file ../../sv-benchmarks/c/nla-digbench-scaling/egcd3-ll_valuebound20.c --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for ERROR reachability Using default analysis Version 0e0057cc Calling Ultimate with: /usr/lib/jvm/java-1.11.0-openjdk-amd64/bin/java -Dosgi.configuration.area=/tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_34ce422d-fb76-4dd4-808c-ba8e1f9cec70/bin/utaipan-verify-nQ1chXbOIh/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_34ce422d-fb76-4dd4-808c-ba8e1f9cec70/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_34ce422d-fb76-4dd4-808c-ba8e1f9cec70/bin/utaipan-verify-nQ1chXbOIh/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_34ce422d-fb76-4dd4-808c-ba8e1f9cec70/bin/utaipan-verify-nQ1chXbOIh/config/TaipanReach.xml -i ../../sv-benchmarks/c/nla-digbench-scaling/egcd3-ll_valuebound20.c -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_34ce422d-fb76-4dd4-808c-ba8e1f9cec70/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_34ce422d-fb76-4dd4-808c-ba8e1f9cec70/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 39b854852f8258ff198098e27d83a5b0e296df48090ebea0d59d234417af0752 --- Real Ultimate output --- This is Ultimate 0.2.4-dev-0e0057c [2023-12-02 12:22:06,384 INFO L188 SettingsManager]: Resetting all preferences to default values... [2023-12-02 12:22:06,450 INFO L114 SettingsManager]: Loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_34ce422d-fb76-4dd4-808c-ba8e1f9cec70/bin/utaipan-verify-nQ1chXbOIh/config/svcomp-Reach-32bit-Taipan_Default.epf [2023-12-02 12:22:06,454 WARN L101 SettingsManager]: Preference file contains the following unknown settings: [2023-12-02 12:22:06,455 WARN L103 SettingsManager]: * de.uni_freiburg.informatik.ultimate.core.Log level for class [2023-12-02 12:22:06,479 INFO L130 SettingsManager]: Preferences different from defaults after loading the file: [2023-12-02 12:22:06,479 INFO L151 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2023-12-02 12:22:06,480 INFO L153 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2023-12-02 12:22:06,481 INFO L151 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2023-12-02 12:22:06,481 INFO L153 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2023-12-02 12:22:06,482 INFO L153 SettingsManager]: * User list type=DISABLED [2023-12-02 12:22:06,483 INFO L151 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2023-12-02 12:22:06,483 INFO L153 SettingsManager]: * Explicit value domain=true [2023-12-02 12:22:06,484 INFO L153 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2023-12-02 12:22:06,484 INFO L153 SettingsManager]: * Octagon Domain=false [2023-12-02 12:22:06,485 INFO L153 SettingsManager]: * Abstract domain=CompoundDomain [2023-12-02 12:22:06,485 INFO L153 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2023-12-02 12:22:06,486 INFO L153 SettingsManager]: * Use the RCFG-of-the-future interface=true [2023-12-02 12:22:06,487 INFO L153 SettingsManager]: * Interval Domain=false [2023-12-02 12:22:06,487 INFO L151 SettingsManager]: Preferences of Sifa differ from their defaults: [2023-12-02 12:22:06,488 INFO L153 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2023-12-02 12:22:06,491 INFO L153 SettingsManager]: * Simplification Technique=POLY_PAC [2023-12-02 12:22:06,491 INFO L151 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2023-12-02 12:22:06,492 INFO L153 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2023-12-02 12:22:06,492 INFO L153 SettingsManager]: * sizeof long=4 [2023-12-02 12:22:06,492 INFO L153 SettingsManager]: * Overapproximate operations on floating types=true [2023-12-02 12:22:06,492 INFO L153 SettingsManager]: * sizeof POINTER=4 [2023-12-02 12:22:06,493 INFO L153 SettingsManager]: * Check division by zero=IGNORE [2023-12-02 12:22:06,493 INFO L153 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2023-12-02 12:22:06,493 INFO L153 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2023-12-02 12:22:06,494 INFO L153 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2023-12-02 12:22:06,494 INFO L153 SettingsManager]: * sizeof long double=12 [2023-12-02 12:22:06,494 INFO L153 SettingsManager]: * Check if freed pointer was valid=false [2023-12-02 12:22:06,495 INFO L153 SettingsManager]: * Use constant arrays=true [2023-12-02 12:22:06,495 INFO L151 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2023-12-02 12:22:06,495 INFO L153 SettingsManager]: * Only consider context switches at boundaries of atomic blocks=true [2023-12-02 12:22:06,495 INFO L153 SettingsManager]: * SMT solver=External_DefaultMode [2023-12-02 12:22:06,495 INFO L153 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2023-12-02 12:22:06,496 INFO L151 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2023-12-02 12:22:06,496 INFO L153 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2023-12-02 12:22:06,496 INFO L153 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopHeads [2023-12-02 12:22:06,496 INFO L153 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2023-12-02 12:22:06,497 INFO L153 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2023-12-02 12:22:06,497 INFO L153 SettingsManager]: * Apply one-shot large block encoding in concurrent analysis=false [2023-12-02 12:22:06,497 INFO L153 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2023-12-02 12:22:06,497 INFO L153 SettingsManager]: * Trace refinement exception blacklist=NONE [2023-12-02 12:22:06,497 INFO L153 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2023-12-02 12:22:06,497 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_34ce422d-fb76-4dd4-808c-ba8e1f9cec70/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_34ce422d-fb76-4dd4-808c-ba8e1f9cec70/bin/utaipan-verify-nQ1chXbOIh Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> 39b854852f8258ff198098e27d83a5b0e296df48090ebea0d59d234417af0752 [2023-12-02 12:22:06,725 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2023-12-02 12:22:06,747 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2023-12-02 12:22:06,750 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2023-12-02 12:22:06,752 INFO L270 PluginConnector]: Initializing CDTParser... [2023-12-02 12:22:06,752 INFO L274 PluginConnector]: CDTParser initialized [2023-12-02 12:22:06,753 INFO L431 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_34ce422d-fb76-4dd4-808c-ba8e1f9cec70/bin/utaipan-verify-nQ1chXbOIh/../../sv-benchmarks/c/nla-digbench-scaling/egcd3-ll_valuebound20.c [2023-12-02 12:22:09,592 INFO L533 CDTParser]: Created temporary CDT project at NULL [2023-12-02 12:22:09,768 INFO L384 CDTParser]: Found 1 translation units. [2023-12-02 12:22:09,769 INFO L180 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_34ce422d-fb76-4dd4-808c-ba8e1f9cec70/sv-benchmarks/c/nla-digbench-scaling/egcd3-ll_valuebound20.c [2023-12-02 12:22:09,777 INFO L427 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_34ce422d-fb76-4dd4-808c-ba8e1f9cec70/bin/utaipan-verify-nQ1chXbOIh/data/9f7875a02/a33b28f5219342359aa2696181f4b02e/FLAG416ecb11f [2023-12-02 12:22:09,789 INFO L435 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_34ce422d-fb76-4dd4-808c-ba8e1f9cec70/bin/utaipan-verify-nQ1chXbOIh/data/9f7875a02/a33b28f5219342359aa2696181f4b02e [2023-12-02 12:22:09,792 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2023-12-02 12:22:09,793 INFO L133 ToolchainWalker]: Walking toolchain with 6 elements. [2023-12-02 12:22:09,794 INFO L112 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2023-12-02 12:22:09,795 INFO L270 PluginConnector]: Initializing CACSL2BoogieTranslator... [2023-12-02 12:22:09,800 INFO L274 PluginConnector]: CACSL2BoogieTranslator initialized [2023-12-02 12:22:09,800 INFO L184 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 02.12 12:22:09" (1/1) ... [2023-12-02 12:22:09,802 INFO L204 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@49becb55 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 12:22:09, skipping insertion in model container [2023-12-02 12:22:09,802 INFO L184 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 02.12 12:22:09" (1/1) ... [2023-12-02 12:22:09,826 INFO L177 MainTranslator]: Built tables and reachable declarations [2023-12-02 12:22:10,006 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_34ce422d-fb76-4dd4-808c-ba8e1f9cec70/sv-benchmarks/c/nla-digbench-scaling/egcd3-ll_valuebound20.c[490,503] [2023-12-02 12:22:10,025 INFO L209 PostProcessor]: Analyzing one entry point: main [2023-12-02 12:22:10,035 INFO L202 MainTranslator]: Completed pre-run [2023-12-02 12:22:10,047 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_34ce422d-fb76-4dd4-808c-ba8e1f9cec70/sv-benchmarks/c/nla-digbench-scaling/egcd3-ll_valuebound20.c[490,503] [2023-12-02 12:22:10,056 INFO L209 PostProcessor]: Analyzing one entry point: main [2023-12-02 12:22:10,071 INFO L206 MainTranslator]: Completed translation [2023-12-02 12:22:10,071 INFO L201 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 12:22:10 WrapperNode [2023-12-02 12:22:10,071 INFO L131 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2023-12-02 12:22:10,073 INFO L112 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2023-12-02 12:22:10,073 INFO L270 PluginConnector]: Initializing Boogie Procedure Inliner... [2023-12-02 12:22:10,073 INFO L274 PluginConnector]: Boogie Procedure Inliner initialized [2023-12-02 12:22:10,080 INFO L184 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 12:22:10" (1/1) ... [2023-12-02 12:22:10,087 INFO L184 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 12:22:10" (1/1) ... [2023-12-02 12:22:10,107 INFO L138 Inliner]: procedures = 14, calls = 16, calls flagged for inlining = 2, calls inlined = 2, statements flattened = 83 [2023-12-02 12:22:10,107 INFO L131 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2023-12-02 12:22:10,108 INFO L112 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2023-12-02 12:22:10,108 INFO L270 PluginConnector]: Initializing Boogie Preprocessor... [2023-12-02 12:22:10,108 INFO L274 PluginConnector]: Boogie Preprocessor initialized [2023-12-02 12:22:10,117 INFO L184 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 12:22:10" (1/1) ... [2023-12-02 12:22:10,118 INFO L184 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 12:22:10" (1/1) ... [2023-12-02 12:22:10,120 INFO L184 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 12:22:10" (1/1) ... [2023-12-02 12:22:10,120 INFO L184 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 12:22:10" (1/1) ... [2023-12-02 12:22:10,124 INFO L184 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 12:22:10" (1/1) ... [2023-12-02 12:22:10,128 INFO L184 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 12:22:10" (1/1) ... [2023-12-02 12:22:10,129 INFO L184 PluginConnector]: Executing the observer LTLStepAnnotator from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 12:22:10" (1/1) ... [2023-12-02 12:22:10,130 INFO L184 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 12:22:10" (1/1) ... [2023-12-02 12:22:10,132 INFO L131 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2023-12-02 12:22:10,133 INFO L112 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2023-12-02 12:22:10,133 INFO L270 PluginConnector]: Initializing RCFGBuilder... [2023-12-02 12:22:10,133 INFO L274 PluginConnector]: RCFGBuilder initialized [2023-12-02 12:22:10,134 INFO L184 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 12:22:10" (1/1) ... [2023-12-02 12:22:10,140 INFO L173 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2023-12-02 12:22:10,151 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_34ce422d-fb76-4dd4-808c-ba8e1f9cec70/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 12:22:10,163 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_34ce422d-fb76-4dd4-808c-ba8e1f9cec70/bin/utaipan-verify-nQ1chXbOIh/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2023-12-02 12:22:10,169 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_34ce422d-fb76-4dd4-808c-ba8e1f9cec70/bin/utaipan-verify-nQ1chXbOIh/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2023-12-02 12:22:10,202 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2023-12-02 12:22:10,203 INFO L130 BoogieDeclarations]: Found specification of procedure assume_abort_if_not [2023-12-02 12:22:10,203 INFO L138 BoogieDeclarations]: Found implementation of procedure assume_abort_if_not [2023-12-02 12:22:10,203 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2023-12-02 12:22:10,203 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2023-12-02 12:22:10,203 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2023-12-02 12:22:10,204 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2023-12-02 12:22:10,204 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2023-12-02 12:22:10,273 INFO L241 CfgBuilder]: Building ICFG [2023-12-02 12:22:10,275 INFO L267 CfgBuilder]: Building CFG for each procedure with an implementation [2023-12-02 12:22:10,425 INFO L282 CfgBuilder]: Performing block encoding [2023-12-02 12:22:10,450 INFO L304 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2023-12-02 12:22:10,450 INFO L309 CfgBuilder]: Removed 3 assume(true) statements. [2023-12-02 12:22:10,451 INFO L201 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 02.12 12:22:10 BoogieIcfgContainer [2023-12-02 12:22:10,452 INFO L131 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2023-12-02 12:22:10,455 INFO L112 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2023-12-02 12:22:10,455 INFO L270 PluginConnector]: Initializing TraceAbstraction... [2023-12-02 12:22:10,458 INFO L274 PluginConnector]: TraceAbstraction initialized [2023-12-02 12:22:10,459 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 02.12 12:22:09" (1/3) ... [2023-12-02 12:22:10,459 INFO L204 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@20fb41e1 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 02.12 12:22:10, skipping insertion in model container [2023-12-02 12:22:10,460 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 12:22:10" (2/3) ... [2023-12-02 12:22:10,460 INFO L204 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@20fb41e1 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 02.12 12:22:10, skipping insertion in model container [2023-12-02 12:22:10,460 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 02.12 12:22:10" (3/3) ... [2023-12-02 12:22:10,462 INFO L112 eAbstractionObserver]: Analyzing ICFG egcd3-ll_valuebound20.c [2023-12-02 12:22:10,482 INFO L203 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2023-12-02 12:22:10,483 INFO L162 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2023-12-02 12:22:10,532 INFO L356 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2023-12-02 12:22:10,540 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;@7b457cbd, mLbeIndependenceSettings=[IndependenceType=SEMANTIC, AbstractionType=NONE, UseConditional=false, UseSemiCommutativity=true, Solver=Z3, SolverTimeout=1000ms] [2023-12-02 12:22:10,540 INFO L358 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2023-12-02 12:22:10,544 INFO L276 IsEmpty]: Start isEmpty. Operand has 30 states, 17 states have (on average 1.4705882352941178) internal successors, (25), 18 states have internal predecessors, (25), 9 states have call successors, (9), 2 states have call predecessors, (9), 2 states have return successors, (9), 9 states have call predecessors, (9), 9 states have call successors, (9) [2023-12-02 12:22:10,552 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2023-12-02 12:22:10,552 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 12:22:10,553 INFO L195 NwaCegarLoop]: trace histogram [4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-12-02 12:22:10,554 INFO L420 AbstractCegarLoop]: === Iteration 1 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 12:22:10,559 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 12:22:10,559 INFO L85 PathProgramCache]: Analyzing trace with hash 1539547475, now seen corresponding path program 1 times [2023-12-02 12:22:10,569 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 12:22:10,570 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2117531360] [2023-12-02 12:22:10,570 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 12:22:10,570 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 12:22:10,685 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 12:22:10,720 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 12:22:10,720 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2117531360] [2023-12-02 12:22:10,721 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unsupported non-linear arithmetic [2023-12-02 12:22:10,721 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [937559481] [2023-12-02 12:22:10,721 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 12:22:10,722 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 12:22:10,722 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_34ce422d-fb76-4dd4-808c-ba8e1f9cec70/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 12:22:10,723 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_34ce422d-fb76-4dd4-808c-ba8e1f9cec70/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 12:22:10,725 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_34ce422d-fb76-4dd4-808c-ba8e1f9cec70/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2023-12-02 12:22:10,797 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 12:22:10,800 INFO L262 TraceCheckSpWp]: Trace formula consists of 79 conjuncts, 1 conjunts are in the unsatisfiable core [2023-12-02 12:22:10,805 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 12:22:10,833 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2023-12-02 12:22:10,833 INFO L323 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2023-12-02 12:22:10,834 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [937559481] provided 1 perfect and 0 imperfect interpolant sequences [2023-12-02 12:22:10,834 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-12-02 12:22:10,835 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2023-12-02 12:22:10,837 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1896896550] [2023-12-02 12:22:10,838 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-12-02 12:22:10,843 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 2 states [2023-12-02 12:22:10,844 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 12:22:10,875 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 2 interpolants. [2023-12-02 12:22:10,876 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2023-12-02 12:22:10,878 INFO L87 Difference]: Start difference. First operand has 30 states, 17 states have (on average 1.4705882352941178) internal successors, (25), 18 states have internal predecessors, (25), 9 states have call successors, (9), 2 states have call predecessors, (9), 2 states have return successors, (9), 9 states have call predecessors, (9), 9 states have call successors, (9) Second operand has 2 states, 2 states have (on average 4.0) internal successors, (8), 2 states have internal predecessors, (8), 2 states have call successors, (5), 2 states have call predecessors, (5), 1 states have return successors, (4), 1 states have call predecessors, (4), 1 states have call successors, (4) [2023-12-02 12:22:10,913 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 12:22:10,914 INFO L93 Difference]: Finished difference Result 51 states and 79 transitions. [2023-12-02 12:22:10,915 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2023-12-02 12:22:10,916 INFO L78 Accepts]: Start accepts. Automaton has has 2 states, 2 states have (on average 4.0) internal successors, (8), 2 states have internal predecessors, (8), 2 states have call successors, (5), 2 states have call predecessors, (5), 1 states have return successors, (4), 1 states have call predecessors, (4), 1 states have call successors, (4) Word has length 20 [2023-12-02 12:22:10,917 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 12:22:10,924 INFO L225 Difference]: With dead ends: 51 [2023-12-02 12:22:10,925 INFO L226 Difference]: Without dead ends: 28 [2023-12-02 12:22:10,928 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 19 GetRequests, 19 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 12:22:10,932 INFO L413 NwaCegarLoop]: 36 mSDtfsCounter, 0 mSDsluCounter, 0 mSDsCounter, 0 mSdLazyCounter, 3 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 36 SdHoareTripleChecker+Invalid, 5 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 3 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2023-12-02 12:22:10,933 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [0 Valid, 36 Invalid, 5 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 3 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2023-12-02 12:22:10,951 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 28 states. [2023-12-02 12:22:10,969 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 28 to 28. [2023-12-02 12:22:10,971 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 28 states, 16 states have (on average 1.25) internal successors, (20), 17 states have internal predecessors, (20), 9 states have call successors, (9), 2 states have call predecessors, (9), 2 states have return successors, (8), 8 states have call predecessors, (8), 8 states have call successors, (8) [2023-12-02 12:22:10,972 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 28 states to 28 states and 37 transitions. [2023-12-02 12:22:10,974 INFO L78 Accepts]: Start accepts. Automaton has 28 states and 37 transitions. Word has length 20 [2023-12-02 12:22:10,975 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 12:22:10,975 INFO L495 AbstractCegarLoop]: Abstraction has 28 states and 37 transitions. [2023-12-02 12:22:10,976 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 2 states, 2 states have (on average 4.0) internal successors, (8), 2 states have internal predecessors, (8), 2 states have call successors, (5), 2 states have call predecessors, (5), 1 states have return successors, (4), 1 states have call predecessors, (4), 1 states have call successors, (4) [2023-12-02 12:22:10,976 INFO L276 IsEmpty]: Start isEmpty. Operand 28 states and 37 transitions. [2023-12-02 12:22:10,977 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2023-12-02 12:22:10,977 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 12:22:10,978 INFO L195 NwaCegarLoop]: trace histogram [4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-12-02 12:22:10,984 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_34ce422d-fb76-4dd4-808c-ba8e1f9cec70/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0 [2023-12-02 12:22:11,178 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_34ce422d-fb76-4dd4-808c-ba8e1f9cec70/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable0 [2023-12-02 12:22:11,179 INFO L420 AbstractCegarLoop]: === Iteration 2 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 12:22:11,180 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 12:22:11,180 INFO L85 PathProgramCache]: Analyzing trace with hash 1863391506, now seen corresponding path program 1 times [2023-12-02 12:22:11,180 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 12:22:11,181 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1237627221] [2023-12-02 12:22:11,181 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 12:22:11,181 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 12:22:11,202 ERROR L246 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2023-12-02 12:22:11,202 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1532675692] [2023-12-02 12:22:11,203 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 12:22:11,203 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 12:22:11,203 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_34ce422d-fb76-4dd4-808c-ba8e1f9cec70/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 12:22:11,204 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_34ce422d-fb76-4dd4-808c-ba8e1f9cec70/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 12:22:11,208 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_34ce422d-fb76-4dd4-808c-ba8e1f9cec70/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2023-12-02 12:22:11,274 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 12:22:11,275 INFO L262 TraceCheckSpWp]: Trace formula consists of 81 conjuncts, 7 conjunts are in the unsatisfiable core [2023-12-02 12:22:11,278 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 12:22:11,344 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 3 proven. 0 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2023-12-02 12:22:11,345 INFO L323 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2023-12-02 12:22:11,345 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 12:22:11,345 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1237627221] [2023-12-02 12:22:11,345 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2023-12-02 12:22:11,345 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1532675692] [2023-12-02 12:22:11,346 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1532675692] provided 1 perfect and 0 imperfect interpolant sequences [2023-12-02 12:22:11,346 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-12-02 12:22:11,346 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2023-12-02 12:22:11,346 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1652272218] [2023-12-02 12:22:11,347 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-12-02 12:22:11,347 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2023-12-02 12:22:11,348 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 12:22:11,349 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2023-12-02 12:22:11,349 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2023-12-02 12:22:11,349 INFO L87 Difference]: Start difference. First operand 28 states and 37 transitions. Second operand has 5 states, 4 states have (on average 2.5) internal successors, (10), 4 states have internal predecessors, (10), 2 states have call successors, (5), 2 states have call predecessors, (5), 2 states have return successors, (4), 2 states have call predecessors, (4), 1 states have call successors, (4) [2023-12-02 12:22:11,436 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 12:22:11,436 INFO L93 Difference]: Finished difference Result 47 states and 62 transitions. [2023-12-02 12:22:11,437 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2023-12-02 12:22:11,437 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 4 states have (on average 2.5) internal successors, (10), 4 states have internal predecessors, (10), 2 states have call successors, (5), 2 states have call predecessors, (5), 2 states have return successors, (4), 2 states have call predecessors, (4), 1 states have call successors, (4) Word has length 21 [2023-12-02 12:22:11,437 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 12:22:11,438 INFO L225 Difference]: With dead ends: 47 [2023-12-02 12:22:11,438 INFO L226 Difference]: Without dead ends: 40 [2023-12-02 12:22:11,439 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 21 GetRequests, 17 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 12:22:11,441 INFO L413 NwaCegarLoop]: 26 mSDtfsCounter, 30 mSDsluCounter, 61 mSDsCounter, 0 mSdLazyCounter, 42 mSolverCounterSat, 8 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 34 SdHoareTripleChecker+Valid, 87 SdHoareTripleChecker+Invalid, 50 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 8 IncrementalHoareTripleChecker+Valid, 42 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-12-02 12:22:11,441 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [34 Valid, 87 Invalid, 50 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [8 Valid, 42 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-12-02 12:22:11,442 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 40 states. [2023-12-02 12:22:11,450 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 40 to 30. [2023-12-02 12:22:11,451 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 30 states, 18 states have (on average 1.2222222222222223) internal successors, (22), 19 states have internal predecessors, (22), 9 states have call successors, (9), 2 states have call predecessors, (9), 2 states have return successors, (8), 8 states have call predecessors, (8), 8 states have call successors, (8) [2023-12-02 12:22:11,452 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 30 states to 30 states and 39 transitions. [2023-12-02 12:22:11,452 INFO L78 Accepts]: Start accepts. Automaton has 30 states and 39 transitions. Word has length 21 [2023-12-02 12:22:11,452 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 12:22:11,453 INFO L495 AbstractCegarLoop]: Abstraction has 30 states and 39 transitions. [2023-12-02 12:22:11,453 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 4 states have (on average 2.5) internal successors, (10), 4 states have internal predecessors, (10), 2 states have call successors, (5), 2 states have call predecessors, (5), 2 states have return successors, (4), 2 states have call predecessors, (4), 1 states have call successors, (4) [2023-12-02 12:22:11,453 INFO L276 IsEmpty]: Start isEmpty. Operand 30 states and 39 transitions. [2023-12-02 12:22:11,454 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2023-12-02 12:22:11,454 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 12:22:11,454 INFO L195 NwaCegarLoop]: trace histogram [4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-12-02 12:22:11,458 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_34ce422d-fb76-4dd4-808c-ba8e1f9cec70/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Ended with exit code 0 [2023-12-02 12:22:11,654 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1,3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_34ce422d-fb76-4dd4-808c-ba8e1f9cec70/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 12:22:11,655 INFO L420 AbstractCegarLoop]: === Iteration 3 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 12:22:11,655 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 12:22:11,655 INFO L85 PathProgramCache]: Analyzing trace with hash -73319670, now seen corresponding path program 1 times [2023-12-02 12:22:11,656 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 12:22:11,656 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1330678051] [2023-12-02 12:22:11,656 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 12:22:11,656 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 12:22:11,675 ERROR L246 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2023-12-02 12:22:11,676 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1518838767] [2023-12-02 12:22:11,676 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 12:22:11,676 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 12:22:11,677 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_34ce422d-fb76-4dd4-808c-ba8e1f9cec70/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 12:22:11,678 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_34ce422d-fb76-4dd4-808c-ba8e1f9cec70/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 12:22:11,692 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_34ce422d-fb76-4dd4-808c-ba8e1f9cec70/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2023-12-02 12:22:11,737 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 12:22:11,739 INFO L262 TraceCheckSpWp]: Trace formula consists of 91 conjuncts, 17 conjunts are in the unsatisfiable core [2023-12-02 12:22:11,742 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 12:22:11,893 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 3 proven. 0 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2023-12-02 12:22:11,893 INFO L323 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2023-12-02 12:22:11,894 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 12:22:11,894 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1330678051] [2023-12-02 12:22:11,894 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2023-12-02 12:22:11,894 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1518838767] [2023-12-02 12:22:11,895 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1518838767] provided 1 perfect and 0 imperfect interpolant sequences [2023-12-02 12:22:11,895 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-12-02 12:22:11,895 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [7] imperfect sequences [] total 7 [2023-12-02 12:22:11,896 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2082252792] [2023-12-02 12:22:11,896 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-12-02 12:22:11,896 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2023-12-02 12:22:11,897 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 12:22:11,897 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2023-12-02 12:22:11,898 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=12, Invalid=30, Unknown=0, NotChecked=0, Total=42 [2023-12-02 12:22:11,898 INFO L87 Difference]: Start difference. First operand 30 states and 39 transitions. Second operand has 7 states, 6 states have (on average 2.1666666666666665) internal successors, (13), 5 states have internal predecessors, (13), 2 states have call successors, (5), 2 states have call predecessors, (5), 2 states have return successors, (4), 2 states have call predecessors, (4), 1 states have call successors, (4) [2023-12-02 12:22:12,025 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 12:22:12,025 INFO L93 Difference]: Finished difference Result 46 states and 60 transitions. [2023-12-02 12:22:12,026 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2023-12-02 12:22:12,026 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 6 states have (on average 2.1666666666666665) internal successors, (13), 5 states have internal predecessors, (13), 2 states have call successors, (5), 2 states have call predecessors, (5), 2 states have return successors, (4), 2 states have call predecessors, (4), 1 states have call successors, (4) Word has length 24 [2023-12-02 12:22:12,026 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 12:22:12,027 INFO L225 Difference]: With dead ends: 46 [2023-12-02 12:22:12,028 INFO L226 Difference]: Without dead ends: 44 [2023-12-02 12:22:12,028 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 24 GetRequests, 18 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=16, Invalid=40, Unknown=0, NotChecked=0, Total=56 [2023-12-02 12:22:12,030 INFO L413 NwaCegarLoop]: 25 mSDtfsCounter, 25 mSDsluCounter, 87 mSDsCounter, 0 mSdLazyCounter, 71 mSolverCounterSat, 4 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 33 SdHoareTripleChecker+Valid, 112 SdHoareTripleChecker+Invalid, 75 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 4 IncrementalHoareTripleChecker+Valid, 71 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-12-02 12:22:12,030 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [33 Valid, 112 Invalid, 75 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [4 Valid, 71 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-12-02 12:22:12,031 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 44 states. [2023-12-02 12:22:12,042 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 44 to 43. [2023-12-02 12:22:12,043 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 43 states, 26 states have (on average 1.2307692307692308) internal successors, (32), 27 states have internal predecessors, (32), 13 states have call successors, (13), 3 states have call predecessors, (13), 3 states have return successors, (12), 12 states have call predecessors, (12), 12 states have call successors, (12) [2023-12-02 12:22:12,044 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 43 states to 43 states and 57 transitions. [2023-12-02 12:22:12,045 INFO L78 Accepts]: Start accepts. Automaton has 43 states and 57 transitions. Word has length 24 [2023-12-02 12:22:12,045 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 12:22:12,045 INFO L495 AbstractCegarLoop]: Abstraction has 43 states and 57 transitions. [2023-12-02 12:22:12,045 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 6 states have (on average 2.1666666666666665) internal successors, (13), 5 states have internal predecessors, (13), 2 states have call successors, (5), 2 states have call predecessors, (5), 2 states have return successors, (4), 2 states have call predecessors, (4), 1 states have call successors, (4) [2023-12-02 12:22:12,046 INFO L276 IsEmpty]: Start isEmpty. Operand 43 states and 57 transitions. [2023-12-02 12:22:12,047 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2023-12-02 12:22:12,047 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 12:22:12,047 INFO L195 NwaCegarLoop]: trace histogram [4, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-12-02 12:22:12,051 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_34ce422d-fb76-4dd4-808c-ba8e1f9cec70/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Ended with exit code 0 [2023-12-02 12:22:12,251 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_34ce422d-fb76-4dd4-808c-ba8e1f9cec70/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable2 [2023-12-02 12:22:12,252 INFO L420 AbstractCegarLoop]: === Iteration 4 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 12:22:12,252 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 12:22:12,252 INFO L85 PathProgramCache]: Analyzing trace with hash -1101454984, now seen corresponding path program 1 times [2023-12-02 12:22:12,252 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 12:22:12,253 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [223429385] [2023-12-02 12:22:12,253 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 12:22:12,253 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 12:22:12,269 ERROR L246 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2023-12-02 12:22:12,269 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [756227273] [2023-12-02 12:22:12,269 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 12:22:12,269 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 12:22:12,269 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_34ce422d-fb76-4dd4-808c-ba8e1f9cec70/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 12:22:12,270 INFO L229 MonitoredProcess]: Starting monitored process 5 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_34ce422d-fb76-4dd4-808c-ba8e1f9cec70/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 12:22:12,271 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_34ce422d-fb76-4dd4-808c-ba8e1f9cec70/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2023-12-02 12:22:12,315 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 12:22:12,316 INFO L262 TraceCheckSpWp]: Trace formula consists of 101 conjuncts, 9 conjunts are in the unsatisfiable core [2023-12-02 12:22:12,319 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 12:22:12,365 INFO L134 CoverageAnalysis]: Checked inductivity of 14 backedges. 2 proven. 3 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2023-12-02 12:22:12,365 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-12-02 12:22:12,441 INFO L134 CoverageAnalysis]: Checked inductivity of 14 backedges. 2 proven. 3 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2023-12-02 12:22:12,442 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 12:22:12,442 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [223429385] [2023-12-02 12:22:12,442 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2023-12-02 12:22:12,442 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [756227273] [2023-12-02 12:22:12,442 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [756227273] provided 0 perfect and 2 imperfect interpolant sequences [2023-12-02 12:22:12,442 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [130063743] [2023-12-02 12:22:12,461 INFO L159 IcfgInterpreter]: Started Sifa with 19 locations of interest [2023-12-02 12:22:12,462 INFO L166 IcfgInterpreter]: Building call graph [2023-12-02 12:22:12,465 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-12-02 12:22:12,470 INFO L176 IcfgInterpreter]: Starting interpretation [2023-12-02 12:22:12,470 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-12-02 12:22:13,527 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 3 for LOIs [2023-12-02 12:22:13,528 INFO L180 IcfgInterpreter]: Interpretation finished [2023-12-02 12:22:14,447 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSifa [130063743] provided 1 perfect and 0 imperfect interpolant sequences [2023-12-02 12:22:14,447 INFO L185 FreeRefinementEngine]: Found 1 perfect and 2 imperfect interpolant sequences. [2023-12-02 12:22:14,448 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [12] imperfect sequences [7, 7] total 18 [2023-12-02 12:22:14,448 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1177172180] [2023-12-02 12:22:14,448 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-12-02 12:22:14,449 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 13 states [2023-12-02 12:22:14,449 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 12:22:14,450 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2023-12-02 12:22:14,450 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=93, Invalid=213, Unknown=0, NotChecked=0, Total=306 [2023-12-02 12:22:14,450 INFO L87 Difference]: Start difference. First operand 43 states and 57 transitions. Second operand has 13 states, 8 states have (on average 1.625) internal successors, (13), 7 states have internal predecessors, (13), 5 states have call successors, (5), 2 states have call predecessors, (5), 1 states have return successors, (4), 4 states have call predecessors, (4), 4 states have call successors, (4) [2023-12-02 12:22:14,737 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 12:22:14,738 INFO L93 Difference]: Finished difference Result 81 states and 113 transitions. [2023-12-02 12:22:14,738 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2023-12-02 12:22:14,739 INFO L78 Accepts]: Start accepts. Automaton has has 13 states, 8 states have (on average 1.625) internal successors, (13), 7 states have internal predecessors, (13), 5 states have call successors, (5), 2 states have call predecessors, (5), 1 states have return successors, (4), 4 states have call predecessors, (4), 4 states have call successors, (4) Word has length 26 [2023-12-02 12:22:14,739 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 12:22:14,740 INFO L225 Difference]: With dead ends: 81 [2023-12-02 12:22:14,741 INFO L226 Difference]: Without dead ends: 74 [2023-12-02 12:22:14,741 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 76 GetRequests, 56 SyntacticMatches, 4 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 25 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=93, Invalid=213, Unknown=0, NotChecked=0, Total=306 [2023-12-02 12:22:14,743 INFO L413 NwaCegarLoop]: 19 mSDtfsCounter, 54 mSDsluCounter, 26 mSDsCounter, 0 mSdLazyCounter, 101 mSolverCounterSat, 26 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 66 SdHoareTripleChecker+Valid, 45 SdHoareTripleChecker+Invalid, 127 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 26 IncrementalHoareTripleChecker+Valid, 101 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2023-12-02 12:22:14,743 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [66 Valid, 45 Invalid, 127 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [26 Valid, 101 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2023-12-02 12:22:14,744 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 74 states. [2023-12-02 12:22:14,766 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 74 to 50. [2023-12-02 12:22:14,766 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 50 states, 33 states have (on average 1.2424242424242424) internal successors, (41), 34 states have internal predecessors, (41), 13 states have call successors, (13), 3 states have call predecessors, (13), 3 states have return successors, (12), 12 states have call predecessors, (12), 12 states have call successors, (12) [2023-12-02 12:22:14,768 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 50 states to 50 states and 66 transitions. [2023-12-02 12:22:14,768 INFO L78 Accepts]: Start accepts. Automaton has 50 states and 66 transitions. Word has length 26 [2023-12-02 12:22:14,769 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 12:22:14,769 INFO L495 AbstractCegarLoop]: Abstraction has 50 states and 66 transitions. [2023-12-02 12:22:14,769 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 13 states, 8 states have (on average 1.625) internal successors, (13), 7 states have internal predecessors, (13), 5 states have call successors, (5), 2 states have call predecessors, (5), 1 states have return successors, (4), 4 states have call predecessors, (4), 4 states have call successors, (4) [2023-12-02 12:22:14,769 INFO L276 IsEmpty]: Start isEmpty. Operand 50 states and 66 transitions. [2023-12-02 12:22:14,770 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 30 [2023-12-02 12:22:14,770 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 12:22:14,771 INFO L195 NwaCegarLoop]: trace histogram [4, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-12-02 12:22:14,775 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_34ce422d-fb76-4dd4-808c-ba8e1f9cec70/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Forceful destruction successful, exit code 0 [2023-12-02 12:22:14,975 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3,5 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_34ce422d-fb76-4dd4-808c-ba8e1f9cec70/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 12:22:14,976 INFO L420 AbstractCegarLoop]: === Iteration 5 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 12:22:14,976 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 12:22:14,976 INFO L85 PathProgramCache]: Analyzing trace with hash -156943002, now seen corresponding path program 1 times [2023-12-02 12:22:14,976 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 12:22:14,976 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2073276484] [2023-12-02 12:22:14,977 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 12:22:14,977 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 12:22:14,988 ERROR L246 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2023-12-02 12:22:14,988 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1441832682] [2023-12-02 12:22:14,988 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 12:22:14,988 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 12:22:14,988 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_34ce422d-fb76-4dd4-808c-ba8e1f9cec70/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 12:22:14,989 INFO L229 MonitoredProcess]: Starting monitored process 6 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_34ce422d-fb76-4dd4-808c-ba8e1f9cec70/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 12:22:14,990 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_34ce422d-fb76-4dd4-808c-ba8e1f9cec70/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2023-12-02 12:22:15,042 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 12:22:15,043 INFO L262 TraceCheckSpWp]: Trace formula consists of 100 conjuncts, 27 conjunts are in the unsatisfiable core [2023-12-02 12:22:15,046 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 12:22:15,221 INFO L134 CoverageAnalysis]: Checked inductivity of 14 backedges. 2 proven. 4 refuted. 0 times theorem prover too weak. 8 trivial. 0 not checked. [2023-12-02 12:22:15,221 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-12-02 12:22:15,319 INFO L134 CoverageAnalysis]: Checked inductivity of 14 backedges. 2 proven. 0 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2023-12-02 12:22:15,320 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 12:22:15,320 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2073276484] [2023-12-02 12:22:15,320 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2023-12-02 12:22:15,320 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1441832682] [2023-12-02 12:22:15,320 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1441832682] provided 1 perfect and 1 imperfect interpolant sequences [2023-12-02 12:22:15,321 INFO L185 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2023-12-02 12:22:15,321 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [10] total 12 [2023-12-02 12:22:15,321 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [225014653] [2023-12-02 12:22:15,321 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-12-02 12:22:15,321 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2023-12-02 12:22:15,322 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 12:22:15,322 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2023-12-02 12:22:15,322 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=27, Invalid=105, Unknown=0, NotChecked=0, Total=132 [2023-12-02 12:22:15,323 INFO L87 Difference]: Start difference. First operand 50 states and 66 transitions. Second operand has 5 states, 5 states have (on average 3.0) internal successors, (15), 4 states have internal predecessors, (15), 2 states have call successors, (6), 2 states have call predecessors, (6), 1 states have return successors, (5), 2 states have call predecessors, (5), 2 states have call successors, (5) [2023-12-02 12:22:15,397 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 12:22:15,398 INFO L93 Difference]: Finished difference Result 58 states and 73 transitions. [2023-12-02 12:22:15,398 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2023-12-02 12:22:15,398 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 3.0) internal successors, (15), 4 states have internal predecessors, (15), 2 states have call successors, (6), 2 states have call predecessors, (6), 1 states have return successors, (5), 2 states have call predecessors, (5), 2 states have call successors, (5) Word has length 29 [2023-12-02 12:22:15,399 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 12:22:15,400 INFO L225 Difference]: With dead ends: 58 [2023-12-02 12:22:15,400 INFO L226 Difference]: Without dead ends: 56 [2023-12-02 12:22:15,401 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 57 GetRequests, 46 SyntacticMatches, 0 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 18 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=31, Invalid=125, Unknown=0, NotChecked=0, Total=156 [2023-12-02 12:22:15,402 INFO L413 NwaCegarLoop]: 31 mSDtfsCounter, 8 mSDsluCounter, 79 mSDsCounter, 0 mSdLazyCounter, 41 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 11 SdHoareTripleChecker+Valid, 110 SdHoareTripleChecker+Invalid, 42 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 41 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2023-12-02 12:22:15,402 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [11 Valid, 110 Invalid, 42 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 41 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2023-12-02 12:22:15,403 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 56 states. [2023-12-02 12:22:15,425 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 56 to 54. [2023-12-02 12:22:15,425 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 54 states, 36 states have (on average 1.2222222222222223) internal successors, (44), 37 states have internal predecessors, (44), 13 states have call successors, (13), 4 states have call predecessors, (13), 4 states have return successors, (12), 12 states have call predecessors, (12), 12 states have call successors, (12) [2023-12-02 12:22:15,426 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 54 states to 54 states and 69 transitions. [2023-12-02 12:22:15,426 INFO L78 Accepts]: Start accepts. Automaton has 54 states and 69 transitions. Word has length 29 [2023-12-02 12:22:15,427 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 12:22:15,427 INFO L495 AbstractCegarLoop]: Abstraction has 54 states and 69 transitions. [2023-12-02 12:22:15,427 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 3.0) internal successors, (15), 4 states have internal predecessors, (15), 2 states have call successors, (6), 2 states have call predecessors, (6), 1 states have return successors, (5), 2 states have call predecessors, (5), 2 states have call successors, (5) [2023-12-02 12:22:15,427 INFO L276 IsEmpty]: Start isEmpty. Operand 54 states and 69 transitions. [2023-12-02 12:22:15,428 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 30 [2023-12-02 12:22:15,428 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 12:22:15,428 INFO L195 NwaCegarLoop]: trace histogram [4, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-12-02 12:22:15,433 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_34ce422d-fb76-4dd4-808c-ba8e1f9cec70/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Ended with exit code 0 [2023-12-02 12:22:15,629 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,6 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_34ce422d-fb76-4dd4-808c-ba8e1f9cec70/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 12:22:15,629 INFO L420 AbstractCegarLoop]: === Iteration 6 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 12:22:15,629 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 12:22:15,630 INFO L85 PathProgramCache]: Analyzing trace with hash 187338980, now seen corresponding path program 1 times [2023-12-02 12:22:15,630 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 12:22:15,630 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [409103319] [2023-12-02 12:22:15,630 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 12:22:15,630 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 12:22:15,641 ERROR L246 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2023-12-02 12:22:15,642 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [2005291232] [2023-12-02 12:22:15,642 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 12:22:15,642 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 12:22:15,642 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_34ce422d-fb76-4dd4-808c-ba8e1f9cec70/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 12:22:15,643 INFO L229 MonitoredProcess]: Starting monitored process 7 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_34ce422d-fb76-4dd4-808c-ba8e1f9cec70/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 12:22:15,648 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_34ce422d-fb76-4dd4-808c-ba8e1f9cec70/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Waiting until timeout for monitored process [2023-12-02 12:22:15,698 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 12:22:15,699 INFO L262 TraceCheckSpWp]: Trace formula consists of 111 conjuncts, 29 conjunts are in the unsatisfiable core [2023-12-02 12:22:15,701 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 12:22:15,874 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 2 proven. 5 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2023-12-02 12:22:15,874 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-12-02 12:22:15,969 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2023-12-02 12:22:15,969 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 12:22:15,970 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [409103319] [2023-12-02 12:22:15,970 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2023-12-02 12:22:15,970 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2005291232] [2023-12-02 12:22:15,970 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2005291232] provided 0 perfect and 2 imperfect interpolant sequences [2023-12-02 12:22:15,970 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [512795846] [2023-12-02 12:22:15,973 INFO L159 IcfgInterpreter]: Started Sifa with 20 locations of interest [2023-12-02 12:22:15,973 INFO L166 IcfgInterpreter]: Building call graph [2023-12-02 12:22:15,973 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-12-02 12:22:15,973 INFO L176 IcfgInterpreter]: Starting interpretation [2023-12-02 12:22:15,974 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-12-02 12:22:16,560 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 84 for LOIs [2023-12-02 12:22:16,644 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 3 for LOIs [2023-12-02 12:22:16,646 INFO L180 IcfgInterpreter]: Interpretation finished [2023-12-02 12:22:18,245 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSifa [512795846] provided 1 perfect and 0 imperfect interpolant sequences [2023-12-02 12:22:18,246 INFO L185 FreeRefinementEngine]: Found 1 perfect and 2 imperfect interpolant sequences. [2023-12-02 12:22:18,246 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [15] imperfect sequences [9, 6] total 27 [2023-12-02 12:22:18,246 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1764914792] [2023-12-02 12:22:18,246 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-12-02 12:22:18,247 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 16 states [2023-12-02 12:22:18,247 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 12:22:18,248 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2023-12-02 12:22:18,248 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=140, Invalid=562, Unknown=0, NotChecked=0, Total=702 [2023-12-02 12:22:18,248 INFO L87 Difference]: Start difference. First operand 54 states and 69 transitions. Second operand has 16 states, 11 states have (on average 1.2727272727272727) internal successors, (14), 9 states have internal predecessors, (14), 5 states have call successors, (5), 2 states have call predecessors, (5), 1 states have return successors, (4), 4 states have call predecessors, (4), 4 states have call successors, (4) [2023-12-02 12:22:18,647 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 12:22:18,647 INFO L93 Difference]: Finished difference Result 98 states and 138 transitions. [2023-12-02 12:22:18,647 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2023-12-02 12:22:18,647 INFO L78 Accepts]: Start accepts. Automaton has has 16 states, 11 states have (on average 1.2727272727272727) internal successors, (14), 9 states have internal predecessors, (14), 5 states have call successors, (5), 2 states have call predecessors, (5), 1 states have return successors, (4), 4 states have call predecessors, (4), 4 states have call successors, (4) Word has length 29 [2023-12-02 12:22:18,648 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 12:22:18,649 INFO L225 Difference]: With dead ends: 98 [2023-12-02 12:22:18,649 INFO L226 Difference]: Without dead ends: 96 [2023-12-02 12:22:18,649 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 85 GetRequests, 60 SyntacticMatches, 0 SemanticMatches, 25 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 159 ImplicationChecksByTransitivity, 1.7s TimeCoverageRelationStatistics Valid=140, Invalid=562, Unknown=0, NotChecked=0, Total=702 [2023-12-02 12:22:18,650 INFO L413 NwaCegarLoop]: 17 mSDtfsCounter, 46 mSDsluCounter, 40 mSDsCounter, 0 mSdLazyCounter, 174 mSolverCounterSat, 35 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 62 SdHoareTripleChecker+Valid, 57 SdHoareTripleChecker+Invalid, 209 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 35 IncrementalHoareTripleChecker+Valid, 174 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2023-12-02 12:22:18,650 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [62 Valid, 57 Invalid, 209 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [35 Valid, 174 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2023-12-02 12:22:18,651 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 96 states. [2023-12-02 12:22:18,694 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 96 to 89. [2023-12-02 12:22:18,694 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 89 states, 50 states have (on average 1.24) internal successors, (62), 53 states have internal predecessors, (62), 33 states have call successors, (33), 5 states have call predecessors, (33), 5 states have return successors, (32), 30 states have call predecessors, (32), 32 states have call successors, (32) [2023-12-02 12:22:18,696 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 89 states to 89 states and 127 transitions. [2023-12-02 12:22:18,696 INFO L78 Accepts]: Start accepts. Automaton has 89 states and 127 transitions. Word has length 29 [2023-12-02 12:22:18,696 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 12:22:18,696 INFO L495 AbstractCegarLoop]: Abstraction has 89 states and 127 transitions. [2023-12-02 12:22:18,696 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 16 states, 11 states have (on average 1.2727272727272727) internal successors, (14), 9 states have internal predecessors, (14), 5 states have call successors, (5), 2 states have call predecessors, (5), 1 states have return successors, (4), 4 states have call predecessors, (4), 4 states have call successors, (4) [2023-12-02 12:22:18,697 INFO L276 IsEmpty]: Start isEmpty. Operand 89 states and 127 transitions. [2023-12-02 12:22:18,699 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 52 [2023-12-02 12:22:18,699 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 12:22:18,699 INFO L195 NwaCegarLoop]: trace histogram [5, 4, 4, 4, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-12-02 12:22:18,703 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_34ce422d-fb76-4dd4-808c-ba8e1f9cec70/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Ended with exit code 0 [2023-12-02 12:22:18,899 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 7 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_34ce422d-fb76-4dd4-808c-ba8e1f9cec70/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable5 [2023-12-02 12:22:18,899 INFO L420 AbstractCegarLoop]: === Iteration 7 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 12:22:18,900 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 12:22:18,900 INFO L85 PathProgramCache]: Analyzing trace with hash -1193022788, now seen corresponding path program 1 times [2023-12-02 12:22:18,900 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 12:22:18,900 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2113662277] [2023-12-02 12:22:18,900 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 12:22:18,900 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 12:22:18,910 ERROR L246 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2023-12-02 12:22:18,910 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1831099389] [2023-12-02 12:22:18,910 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 12:22:18,911 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 12:22:18,911 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_34ce422d-fb76-4dd4-808c-ba8e1f9cec70/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 12:22:18,912 INFO L229 MonitoredProcess]: Starting monitored process 8 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_34ce422d-fb76-4dd4-808c-ba8e1f9cec70/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 12:22:18,913 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_34ce422d-fb76-4dd4-808c-ba8e1f9cec70/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Waiting until timeout for monitored process [2023-12-02 12:22:18,966 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 12:22:18,968 INFO L262 TraceCheckSpWp]: Trace formula consists of 149 conjuncts, 56 conjunts are in the unsatisfiable core [2023-12-02 12:22:18,972 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 12:22:19,629 INFO L134 CoverageAnalysis]: Checked inductivity of 48 backedges. 12 proven. 12 refuted. 0 times theorem prover too weak. 24 trivial. 0 not checked. [2023-12-02 12:22:19,629 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-12-02 12:22:20,488 INFO L134 CoverageAnalysis]: Checked inductivity of 48 backedges. 10 proven. 11 refuted. 0 times theorem prover too weak. 27 trivial. 0 not checked. [2023-12-02 12:22:20,488 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 12:22:20,489 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2113662277] [2023-12-02 12:22:20,489 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2023-12-02 12:22:20,489 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1831099389] [2023-12-02 12:22:20,489 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1831099389] provided 0 perfect and 2 imperfect interpolant sequences [2023-12-02 12:22:20,489 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [970390552] [2023-12-02 12:22:20,492 INFO L159 IcfgInterpreter]: Started Sifa with 28 locations of interest [2023-12-02 12:22:20,492 INFO L166 IcfgInterpreter]: Building call graph [2023-12-02 12:22:20,492 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-12-02 12:22:20,493 INFO L176 IcfgInterpreter]: Starting interpretation [2023-12-02 12:22:20,493 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-12-02 12:22:25,229 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 1 for LOIs [2023-12-02 12:22:25,232 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 3 for LOIs [2023-12-02 12:22:25,233 INFO L180 IcfgInterpreter]: Interpretation finished [2023-12-02 12:22:27,498 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '2127#(and (= |__VERIFIER_assert_#in~cond| 0) (= __VERIFIER_assert_~cond 0))' at error location [2023-12-02 12:22:27,498 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-12-02 12:22:27,498 INFO L185 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2023-12-02 12:22:27,498 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 13] total 25 [2023-12-02 12:22:27,498 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [736649049] [2023-12-02 12:22:27,498 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2023-12-02 12:22:27,499 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 25 states [2023-12-02 12:22:27,499 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 12:22:27,500 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2023-12-02 12:22:27,501 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=174, Invalid=1548, Unknown=0, NotChecked=0, Total=1722 [2023-12-02 12:22:27,502 INFO L87 Difference]: Start difference. First operand 89 states and 127 transitions. Second operand has 25 states, 22 states have (on average 1.9545454545454546) internal successors, (43), 22 states have internal predecessors, (43), 7 states have call successors, (15), 3 states have call predecessors, (15), 3 states have return successors, (14), 5 states have call predecessors, (14), 5 states have call successors, (14) [2023-12-02 12:22:38,052 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 12:22:38,052 INFO L93 Difference]: Finished difference Result 256 states and 375 transitions. [2023-12-02 12:22:38,053 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 35 states. [2023-12-02 12:22:38,053 INFO L78 Accepts]: Start accepts. Automaton has has 25 states, 22 states have (on average 1.9545454545454546) internal successors, (43), 22 states have internal predecessors, (43), 7 states have call successors, (15), 3 states have call predecessors, (15), 3 states have return successors, (14), 5 states have call predecessors, (14), 5 states have call successors, (14) Word has length 51 [2023-12-02 12:22:38,054 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 12:22:38,057 INFO L225 Difference]: With dead ends: 256 [2023-12-02 12:22:38,057 INFO L226 Difference]: Without dead ends: 218 [2023-12-02 12:22:38,059 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 178 GetRequests, 111 SyntacticMatches, 1 SemanticMatches, 66 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1283 ImplicationChecksByTransitivity, 8.1s TimeCoverageRelationStatistics Valid=583, Invalid=3973, Unknown=0, NotChecked=0, Total=4556 [2023-12-02 12:22:38,060 INFO L413 NwaCegarLoop]: 23 mSDtfsCounter, 149 mSDsluCounter, 317 mSDsCounter, 0 mSdLazyCounter, 711 mSolverCounterSat, 126 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 5.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 155 SdHoareTripleChecker+Valid, 340 SdHoareTripleChecker+Invalid, 837 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 126 IncrementalHoareTripleChecker+Valid, 711 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 5.2s IncrementalHoareTripleChecker+Time [2023-12-02 12:22:38,061 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [155 Valid, 340 Invalid, 837 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [126 Valid, 711 Invalid, 0 Unknown, 0 Unchecked, 5.2s Time] [2023-12-02 12:22:38,061 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 218 states. [2023-12-02 12:22:38,160 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 218 to 161. [2023-12-02 12:22:38,161 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 161 states, 104 states have (on average 1.25) internal successors, (130), 106 states have internal predecessors, (130), 49 states have call successors, (49), 7 states have call predecessors, (49), 7 states have return successors, (48), 47 states have call predecessors, (48), 48 states have call successors, (48) [2023-12-02 12:22:38,163 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 161 states to 161 states and 227 transitions. [2023-12-02 12:22:38,163 INFO L78 Accepts]: Start accepts. Automaton has 161 states and 227 transitions. Word has length 51 [2023-12-02 12:22:38,163 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 12:22:38,164 INFO L495 AbstractCegarLoop]: Abstraction has 161 states and 227 transitions. [2023-12-02 12:22:38,164 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 25 states, 22 states have (on average 1.9545454545454546) internal successors, (43), 22 states have internal predecessors, (43), 7 states have call successors, (15), 3 states have call predecessors, (15), 3 states have return successors, (14), 5 states have call predecessors, (14), 5 states have call successors, (14) [2023-12-02 12:22:38,164 INFO L276 IsEmpty]: Start isEmpty. Operand 161 states and 227 transitions. [2023-12-02 12:22:38,167 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 62 [2023-12-02 12:22:38,167 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 12:22:38,167 INFO L195 NwaCegarLoop]: trace histogram [8, 7, 7, 4, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-12-02 12:22:38,172 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_34ce422d-fb76-4dd4-808c-ba8e1f9cec70/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Ended with exit code 0 [2023-12-02 12:22:38,372 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6,8 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_34ce422d-fb76-4dd4-808c-ba8e1f9cec70/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 12:22:38,372 INFO L420 AbstractCegarLoop]: === Iteration 8 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 12:22:38,373 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 12:22:38,373 INFO L85 PathProgramCache]: Analyzing trace with hash 1047855047, now seen corresponding path program 1 times [2023-12-02 12:22:38,373 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 12:22:38,373 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1457007813] [2023-12-02 12:22:38,373 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 12:22:38,373 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 12:22:38,385 ERROR L246 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2023-12-02 12:22:38,385 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [2008757012] [2023-12-02 12:22:38,385 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 12:22:38,385 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 12:22:38,386 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_34ce422d-fb76-4dd4-808c-ba8e1f9cec70/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 12:22:38,387 INFO L229 MonitoredProcess]: Starting monitored process 9 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_34ce422d-fb76-4dd4-808c-ba8e1f9cec70/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 12:22:38,388 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_34ce422d-fb76-4dd4-808c-ba8e1f9cec70/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Waiting until timeout for monitored process [2023-12-02 12:22:38,443 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 12:22:38,444 INFO L262 TraceCheckSpWp]: Trace formula consists of 160 conjuncts, 24 conjunts are in the unsatisfiable core [2023-12-02 12:22:38,447 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 12:22:38,573 INFO L134 CoverageAnalysis]: Checked inductivity of 115 backedges. 25 proven. 15 refuted. 0 times theorem prover too weak. 75 trivial. 0 not checked. [2023-12-02 12:22:38,573 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-12-02 12:22:38,657 INFO L134 CoverageAnalysis]: Checked inductivity of 115 backedges. 27 proven. 10 refuted. 0 times theorem prover too weak. 78 trivial. 0 not checked. [2023-12-02 12:22:38,657 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 12:22:38,657 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1457007813] [2023-12-02 12:22:38,657 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2023-12-02 12:22:38,657 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2008757012] [2023-12-02 12:22:38,658 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2008757012] provided 0 perfect and 2 imperfect interpolant sequences [2023-12-02 12:22:38,658 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [2061770965] [2023-12-02 12:22:38,660 INFO L159 IcfgInterpreter]: Started Sifa with 25 locations of interest [2023-12-02 12:22:38,660 INFO L166 IcfgInterpreter]: Building call graph [2023-12-02 12:22:38,661 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-12-02 12:22:38,661 INFO L176 IcfgInterpreter]: Starting interpretation [2023-12-02 12:22:38,661 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-12-02 12:22:41,309 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 1 for LOIs [2023-12-02 12:22:41,312 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 3 for LOIs [2023-12-02 12:22:41,313 INFO L180 IcfgInterpreter]: Interpretation finished [2023-12-02 12:22:42,193 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '3230#(and (= |__VERIFIER_assert_#in~cond| 0) (= __VERIFIER_assert_~cond 0))' at error location [2023-12-02 12:22:42,193 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-12-02 12:22:42,193 INFO L185 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2023-12-02 12:22:42,193 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 6] total 15 [2023-12-02 12:22:42,193 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1401311123] [2023-12-02 12:22:42,193 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2023-12-02 12:22:42,194 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 15 states [2023-12-02 12:22:42,194 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 12:22:42,195 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2023-12-02 12:22:42,195 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=130, Invalid=740, Unknown=0, NotChecked=0, Total=870 [2023-12-02 12:22:42,195 INFO L87 Difference]: Start difference. First operand 161 states and 227 transitions. Second operand has 15 states, 14 states have (on average 2.357142857142857) internal successors, (33), 12 states have internal predecessors, (33), 4 states have call successors, (20), 3 states have call predecessors, (20), 3 states have return successors, (19), 6 states have call predecessors, (19), 4 states have call successors, (19) [2023-12-02 12:22:42,516 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 12:22:42,516 INFO L93 Difference]: Finished difference Result 198 states and 276 transitions. [2023-12-02 12:22:42,516 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2023-12-02 12:22:42,517 INFO L78 Accepts]: Start accepts. Automaton has has 15 states, 14 states have (on average 2.357142857142857) internal successors, (33), 12 states have internal predecessors, (33), 4 states have call successors, (20), 3 states have call predecessors, (20), 3 states have return successors, (19), 6 states have call predecessors, (19), 4 states have call successors, (19) Word has length 61 [2023-12-02 12:22:42,517 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 12:22:42,520 INFO L225 Difference]: With dead ends: 198 [2023-12-02 12:22:42,520 INFO L226 Difference]: Without dead ends: 196 [2023-12-02 12:22:42,521 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 193 GetRequests, 158 SyntacticMatches, 1 SemanticMatches, 34 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 315 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=178, Invalid=1082, Unknown=0, NotChecked=0, Total=1260 [2023-12-02 12:22:42,522 INFO L413 NwaCegarLoop]: 23 mSDtfsCounter, 51 mSDsluCounter, 116 mSDsCounter, 0 mSdLazyCounter, 199 mSolverCounterSat, 23 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 51 SdHoareTripleChecker+Valid, 139 SdHoareTripleChecker+Invalid, 222 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 23 IncrementalHoareTripleChecker+Valid, 199 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-12-02 12:22:42,522 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [51 Valid, 139 Invalid, 222 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [23 Valid, 199 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-12-02 12:22:42,523 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 196 states. [2023-12-02 12:22:42,617 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 196 to 173. [2023-12-02 12:22:42,617 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 173 states, 113 states have (on average 1.2300884955752212) internal successors, (139), 115 states have internal predecessors, (139), 49 states have call successors, (49), 10 states have call predecessors, (49), 10 states have return successors, (48), 47 states have call predecessors, (48), 48 states have call successors, (48) [2023-12-02 12:22:42,619 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 173 states to 173 states and 236 transitions. [2023-12-02 12:22:42,619 INFO L78 Accepts]: Start accepts. Automaton has 173 states and 236 transitions. Word has length 61 [2023-12-02 12:22:42,619 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 12:22:42,619 INFO L495 AbstractCegarLoop]: Abstraction has 173 states and 236 transitions. [2023-12-02 12:22:42,620 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 15 states, 14 states have (on average 2.357142857142857) internal successors, (33), 12 states have internal predecessors, (33), 4 states have call successors, (20), 3 states have call predecessors, (20), 3 states have return successors, (19), 6 states have call predecessors, (19), 4 states have call successors, (19) [2023-12-02 12:22:42,620 INFO L276 IsEmpty]: Start isEmpty. Operand 173 states and 236 transitions. [2023-12-02 12:22:42,622 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 60 [2023-12-02 12:22:42,622 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 12:22:42,622 INFO L195 NwaCegarLoop]: trace histogram [5, 4, 4, 4, 4, 3, 3, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-12-02 12:22:42,627 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_34ce422d-fb76-4dd4-808c-ba8e1f9cec70/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Ended with exit code 0 [2023-12-02 12:22:42,822 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7,9 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_34ce422d-fb76-4dd4-808c-ba8e1f9cec70/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 12:22:42,823 INFO L420 AbstractCegarLoop]: === Iteration 9 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 12:22:42,823 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 12:22:42,823 INFO L85 PathProgramCache]: Analyzing trace with hash -94425734, now seen corresponding path program 1 times [2023-12-02 12:22:42,823 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 12:22:42,823 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1506174941] [2023-12-02 12:22:42,824 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 12:22:42,824 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 12:22:42,835 ERROR L246 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2023-12-02 12:22:42,835 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [2059486880] [2023-12-02 12:22:42,835 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 12:22:42,835 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 12:22:42,836 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_34ce422d-fb76-4dd4-808c-ba8e1f9cec70/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 12:22:42,837 INFO L229 MonitoredProcess]: Starting monitored process 10 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_34ce422d-fb76-4dd4-808c-ba8e1f9cec70/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 12:22:42,838 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_34ce422d-fb76-4dd4-808c-ba8e1f9cec70/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Waiting until timeout for monitored process [2023-12-02 12:22:42,895 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 12:22:42,897 INFO L262 TraceCheckSpWp]: Trace formula consists of 179 conjuncts, 32 conjunts are in the unsatisfiable core [2023-12-02 12:22:42,899 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 12:22:43,568 INFO L134 CoverageAnalysis]: Checked inductivity of 65 backedges. 12 proven. 29 refuted. 0 times theorem prover too weak. 24 trivial. 0 not checked. [2023-12-02 12:22:43,568 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-12-02 12:22:44,014 INFO L134 CoverageAnalysis]: Checked inductivity of 65 backedges. 25 proven. 9 refuted. 0 times theorem prover too weak. 31 trivial. 0 not checked. [2023-12-02 12:22:44,015 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 12:22:44,015 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1506174941] [2023-12-02 12:22:44,015 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2023-12-02 12:22:44,015 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2059486880] [2023-12-02 12:22:44,015 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2059486880] provided 0 perfect and 2 imperfect interpolant sequences [2023-12-02 12:22:44,015 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [145861743] [2023-12-02 12:22:44,018 INFO L159 IcfgInterpreter]: Started Sifa with 27 locations of interest [2023-12-02 12:22:44,018 INFO L166 IcfgInterpreter]: Building call graph [2023-12-02 12:22:44,018 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-12-02 12:22:44,018 INFO L176 IcfgInterpreter]: Starting interpretation [2023-12-02 12:22:44,018 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-12-02 12:22:48,586 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 9 for LOIs [2023-12-02 12:22:48,590 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 3 for LOIs [2023-12-02 12:22:48,591 INFO L180 IcfgInterpreter]: Interpretation finished [2023-12-02 12:22:49,405 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '4203#(and (= |__VERIFIER_assert_#in~cond| 0) (= __VERIFIER_assert_~cond 0))' at error location [2023-12-02 12:22:49,405 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-12-02 12:22:49,405 INFO L185 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2023-12-02 12:22:49,405 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 8] total 22 [2023-12-02 12:22:49,405 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [453577758] [2023-12-02 12:22:49,405 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2023-12-02 12:22:49,406 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 22 states [2023-12-02 12:22:49,406 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 12:22:49,406 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2023-12-02 12:22:49,407 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=154, Invalid=1406, Unknown=0, NotChecked=0, Total=1560 [2023-12-02 12:22:49,407 INFO L87 Difference]: Start difference. First operand 173 states and 236 transitions. Second operand has 22 states, 21 states have (on average 2.6666666666666665) internal successors, (56), 18 states have internal predecessors, (56), 7 states have call successors, (15), 3 states have call predecessors, (15), 3 states have return successors, (14), 5 states have call predecessors, (14), 5 states have call successors, (14) [2023-12-02 12:23:36,222 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 12:23:44,191 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 12:23:44,192 INFO L93 Difference]: Finished difference Result 345 states and 482 transitions. [2023-12-02 12:23:44,192 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 33 states. [2023-12-02 12:23:44,192 INFO L78 Accepts]: Start accepts. Automaton has has 22 states, 21 states have (on average 2.6666666666666665) internal successors, (56), 18 states have internal predecessors, (56), 7 states have call successors, (15), 3 states have call predecessors, (15), 3 states have return successors, (14), 5 states have call predecessors, (14), 5 states have call successors, (14) Word has length 59 [2023-12-02 12:23:44,193 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 12:23:44,195 INFO L225 Difference]: With dead ends: 345 [2023-12-02 12:23:44,195 INFO L226 Difference]: Without dead ends: 289 [2023-12-02 12:23:44,199 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 214 GetRequests, 149 SyntacticMatches, 1 SemanticMatches, 64 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1163 ImplicationChecksByTransitivity, 37.7s TimeCoverageRelationStatistics Valid=513, Invalid=3777, Unknown=0, NotChecked=0, Total=4290 [2023-12-02 12:23:44,199 INFO L413 NwaCegarLoop]: 53 mSDtfsCounter, 144 mSDsluCounter, 404 mSDsCounter, 0 mSdLazyCounter, 739 mSolverCounterSat, 107 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 18.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 145 SdHoareTripleChecker+Valid, 457 SdHoareTripleChecker+Invalid, 846 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 107 IncrementalHoareTripleChecker+Valid, 739 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 18.3s IncrementalHoareTripleChecker+Time [2023-12-02 12:23:44,200 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [145 Valid, 457 Invalid, 846 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [107 Valid, 739 Invalid, 0 Unknown, 0 Unchecked, 18.3s Time] [2023-12-02 12:23:44,201 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 289 states. [2023-12-02 12:23:44,318 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 289 to 214. [2023-12-02 12:23:44,319 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 214 states, 145 states have (on average 1.2137931034482758) internal successors, (176), 150 states have internal predecessors, (176), 55 states have call successors, (55), 13 states have call predecessors, (55), 13 states have return successors, (54), 50 states have call predecessors, (54), 54 states have call successors, (54) [2023-12-02 12:23:44,321 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 214 states to 214 states and 285 transitions. [2023-12-02 12:23:44,321 INFO L78 Accepts]: Start accepts. Automaton has 214 states and 285 transitions. Word has length 59 [2023-12-02 12:23:44,321 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 12:23:44,321 INFO L495 AbstractCegarLoop]: Abstraction has 214 states and 285 transitions. [2023-12-02 12:23:44,322 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 22 states, 21 states have (on average 2.6666666666666665) internal successors, (56), 18 states have internal predecessors, (56), 7 states have call successors, (15), 3 states have call predecessors, (15), 3 states have return successors, (14), 5 states have call predecessors, (14), 5 states have call successors, (14) [2023-12-02 12:23:44,322 INFO L276 IsEmpty]: Start isEmpty. Operand 214 states and 285 transitions. [2023-12-02 12:23:44,323 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 60 [2023-12-02 12:23:44,323 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 12:23:44,323 INFO L195 NwaCegarLoop]: trace histogram [5, 4, 4, 4, 4, 3, 3, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-12-02 12:23:44,328 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_34ce422d-fb76-4dd4-808c-ba8e1f9cec70/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Ended with exit code 0 [2023-12-02 12:23:44,524 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8,10 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_34ce422d-fb76-4dd4-808c-ba8e1f9cec70/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 12:23:44,524 INFO L420 AbstractCegarLoop]: === Iteration 10 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 12:23:44,524 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 12:23:44,525 INFO L85 PathProgramCache]: Analyzing trace with hash -1223812978, now seen corresponding path program 2 times [2023-12-02 12:23:44,525 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 12:23:44,525 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1469695970] [2023-12-02 12:23:44,525 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 12:23:44,525 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 12:23:44,536 ERROR L246 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2023-12-02 12:23:44,536 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1261654201] [2023-12-02 12:23:44,536 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2023-12-02 12:23:44,536 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 12:23:44,536 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_34ce422d-fb76-4dd4-808c-ba8e1f9cec70/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 12:23:44,537 INFO L229 MonitoredProcess]: Starting monitored process 11 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_34ce422d-fb76-4dd4-808c-ba8e1f9cec70/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 12:23:44,538 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_34ce422d-fb76-4dd4-808c-ba8e1f9cec70/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Waiting until timeout for monitored process [2023-12-02 12:23:44,586 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2023-12-02 12:23:44,586 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-12-02 12:23:44,587 INFO L262 TraceCheckSpWp]: Trace formula consists of 123 conjuncts, 5 conjunts are in the unsatisfiable core [2023-12-02 12:23:44,589 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 12:23:44,608 INFO L134 CoverageAnalysis]: Checked inductivity of 65 backedges. 27 proven. 0 refuted. 0 times theorem prover too weak. 38 trivial. 0 not checked. [2023-12-02 12:23:44,608 INFO L323 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2023-12-02 12:23:44,609 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 12:23:44,609 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1469695970] [2023-12-02 12:23:44,609 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2023-12-02 12:23:44,609 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1261654201] [2023-12-02 12:23:44,609 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1261654201] provided 1 perfect and 0 imperfect interpolant sequences [2023-12-02 12:23:44,609 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-12-02 12:23:44,609 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2023-12-02 12:23:44,609 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1538166215] [2023-12-02 12:23:44,610 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-12-02 12:23:44,610 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2023-12-02 12:23:44,610 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 12:23:44,611 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2023-12-02 12:23:44,611 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2023-12-02 12:23:44,611 INFO L87 Difference]: Start difference. First operand 214 states and 285 transitions. Second operand has 5 states, 5 states have (on average 5.8) internal successors, (29), 5 states have internal predecessors, (29), 2 states have call successors, (9), 2 states have call predecessors, (9), 1 states have return successors, (8), 1 states have call predecessors, (8), 1 states have call successors, (8) [2023-12-02 12:23:44,832 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 12:23:44,832 INFO L93 Difference]: Finished difference Result 280 states and 378 transitions. [2023-12-02 12:23:44,832 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2023-12-02 12:23:44,832 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 5.8) internal successors, (29), 5 states have internal predecessors, (29), 2 states have call successors, (9), 2 states have call predecessors, (9), 1 states have return successors, (8), 1 states have call predecessors, (8), 1 states have call successors, (8) Word has length 59 [2023-12-02 12:23:44,833 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 12:23:44,835 INFO L225 Difference]: With dead ends: 280 [2023-12-02 12:23:44,835 INFO L226 Difference]: Without dead ends: 224 [2023-12-02 12:23:44,836 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 61 GetRequests, 56 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=15, Invalid=27, Unknown=0, NotChecked=0, Total=42 [2023-12-02 12:23:44,837 INFO L413 NwaCegarLoop]: 44 mSDtfsCounter, 19 mSDsluCounter, 99 mSDsCounter, 0 mSdLazyCounter, 58 mSolverCounterSat, 8 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 23 SdHoareTripleChecker+Valid, 143 SdHoareTripleChecker+Invalid, 66 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 8 IncrementalHoareTripleChecker+Valid, 58 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2023-12-02 12:23:44,837 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [23 Valid, 143 Invalid, 66 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [8 Valid, 58 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2023-12-02 12:23:44,838 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 224 states. [2023-12-02 12:23:44,955 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 224 to 180. [2023-12-02 12:23:44,955 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 180 states, 119 states have (on average 1.184873949579832) internal successors, (141), 121 states have internal predecessors, (141), 47 states have call successors, (47), 13 states have call predecessors, (47), 13 states have return successors, (46), 45 states have call predecessors, (46), 46 states have call successors, (46) [2023-12-02 12:23:44,957 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 180 states to 180 states and 234 transitions. [2023-12-02 12:23:44,957 INFO L78 Accepts]: Start accepts. Automaton has 180 states and 234 transitions. Word has length 59 [2023-12-02 12:23:44,957 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 12:23:44,957 INFO L495 AbstractCegarLoop]: Abstraction has 180 states and 234 transitions. [2023-12-02 12:23:44,957 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 5.8) internal successors, (29), 5 states have internal predecessors, (29), 2 states have call successors, (9), 2 states have call predecessors, (9), 1 states have return successors, (8), 1 states have call predecessors, (8), 1 states have call successors, (8) [2023-12-02 12:23:44,957 INFO L276 IsEmpty]: Start isEmpty. Operand 180 states and 234 transitions. [2023-12-02 12:23:44,958 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 65 [2023-12-02 12:23:44,959 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 12:23:44,959 INFO L195 NwaCegarLoop]: trace histogram [7, 6, 6, 4, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-12-02 12:23:44,963 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_34ce422d-fb76-4dd4-808c-ba8e1f9cec70/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Ended with exit code 0 [2023-12-02 12:23:45,159 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 11 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_34ce422d-fb76-4dd4-808c-ba8e1f9cec70/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable9 [2023-12-02 12:23:45,160 INFO L420 AbstractCegarLoop]: === Iteration 11 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 12:23:45,160 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 12:23:45,160 INFO L85 PathProgramCache]: Analyzing trace with hash -365871756, now seen corresponding path program 3 times [2023-12-02 12:23:45,160 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 12:23:45,160 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [790512193] [2023-12-02 12:23:45,161 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 12:23:45,161 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 12:23:45,170 ERROR L246 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2023-12-02 12:23:45,171 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [241174384] [2023-12-02 12:23:45,171 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2023-12-02 12:23:45,171 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 12:23:45,171 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_34ce422d-fb76-4dd4-808c-ba8e1f9cec70/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 12:23:45,172 INFO L229 MonitoredProcess]: Starting monitored process 12 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_34ce422d-fb76-4dd4-808c-ba8e1f9cec70/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 12:23:45,173 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_34ce422d-fb76-4dd4-808c-ba8e1f9cec70/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Waiting until timeout for monitored process [2023-12-02 12:23:45,224 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2023-12-02 12:23:45,224 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-12-02 12:23:45,225 INFO L262 TraceCheckSpWp]: Trace formula consists of 146 conjuncts, 4 conjunts are in the unsatisfiable core [2023-12-02 12:23:45,227 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 12:23:45,254 INFO L134 CoverageAnalysis]: Checked inductivity of 96 backedges. 48 proven. 0 refuted. 0 times theorem prover too weak. 48 trivial. 0 not checked. [2023-12-02 12:23:45,254 INFO L323 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2023-12-02 12:23:45,254 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 12:23:45,254 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [790512193] [2023-12-02 12:23:45,254 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2023-12-02 12:23:45,254 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [241174384] [2023-12-02 12:23:45,254 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [241174384] provided 1 perfect and 0 imperfect interpolant sequences [2023-12-02 12:23:45,255 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-12-02 12:23:45,255 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2023-12-02 12:23:45,255 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1289108789] [2023-12-02 12:23:45,255 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-12-02 12:23:45,255 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2023-12-02 12:23:45,255 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 12:23:45,256 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2023-12-02 12:23:45,256 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2023-12-02 12:23:45,256 INFO L87 Difference]: Start difference. First operand 180 states and 234 transitions. Second operand has 5 states, 5 states have (on average 4.8) internal successors, (24), 5 states have internal predecessors, (24), 3 states have call successors, (11), 2 states have call predecessors, (11), 2 states have return successors, (10), 3 states have call predecessors, (10), 3 states have call successors, (10) [2023-12-02 12:23:45,434 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 12:23:45,434 INFO L93 Difference]: Finished difference Result 308 states and 413 transitions. [2023-12-02 12:23:45,435 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2023-12-02 12:23:45,435 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 4.8) internal successors, (24), 5 states have internal predecessors, (24), 3 states have call successors, (11), 2 states have call predecessors, (11), 2 states have return successors, (10), 3 states have call predecessors, (10), 3 states have call successors, (10) Word has length 64 [2023-12-02 12:23:45,435 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 12:23:45,437 INFO L225 Difference]: With dead ends: 308 [2023-12-02 12:23:45,437 INFO L226 Difference]: Without dead ends: 216 [2023-12-02 12:23:45,438 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 63 GetRequests, 60 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2023-12-02 12:23:45,438 INFO L413 NwaCegarLoop]: 32 mSDtfsCounter, 0 mSDsluCounter, 72 mSDsCounter, 0 mSdLazyCounter, 48 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 104 SdHoareTripleChecker+Invalid, 49 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 48 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2023-12-02 12:23:45,439 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [0 Valid, 104 Invalid, 49 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 48 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2023-12-02 12:23:45,439 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 216 states. [2023-12-02 12:23:45,560 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 216 to 207. [2023-12-02 12:23:45,561 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 207 states, 130 states have (on average 1.176923076923077) internal successors, (153), 132 states have internal predecessors, (153), 63 states have call successors, (63), 13 states have call predecessors, (63), 13 states have return successors, (62), 61 states have call predecessors, (62), 62 states have call successors, (62) [2023-12-02 12:23:45,563 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 207 states to 207 states and 278 transitions. [2023-12-02 12:23:45,563 INFO L78 Accepts]: Start accepts. Automaton has 207 states and 278 transitions. Word has length 64 [2023-12-02 12:23:45,564 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 12:23:45,564 INFO L495 AbstractCegarLoop]: Abstraction has 207 states and 278 transitions. [2023-12-02 12:23:45,564 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 4.8) internal successors, (24), 5 states have internal predecessors, (24), 3 states have call successors, (11), 2 states have call predecessors, (11), 2 states have return successors, (10), 3 states have call predecessors, (10), 3 states have call successors, (10) [2023-12-02 12:23:45,564 INFO L276 IsEmpty]: Start isEmpty. Operand 207 states and 278 transitions. [2023-12-02 12:23:45,565 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 65 [2023-12-02 12:23:45,565 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 12:23:45,566 INFO L195 NwaCegarLoop]: trace histogram [7, 6, 6, 4, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-12-02 12:23:45,571 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_34ce422d-fb76-4dd4-808c-ba8e1f9cec70/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Forceful destruction successful, exit code 0 [2023-12-02 12:23:45,766 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable10,12 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_34ce422d-fb76-4dd4-808c-ba8e1f9cec70/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 12:23:45,766 INFO L420 AbstractCegarLoop]: === Iteration 12 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 12:23:45,767 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 12:23:45,767 INFO L85 PathProgramCache]: Analyzing trace with hash 255729376, now seen corresponding path program 4 times [2023-12-02 12:23:45,767 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 12:23:45,767 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1202605060] [2023-12-02 12:23:45,767 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 12:23:45,767 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 12:23:45,778 ERROR L246 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2023-12-02 12:23:45,778 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1517504973] [2023-12-02 12:23:45,778 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2023-12-02 12:23:45,778 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 12:23:45,779 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_34ce422d-fb76-4dd4-808c-ba8e1f9cec70/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 12:23:45,780 INFO L229 MonitoredProcess]: Starting monitored process 13 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_34ce422d-fb76-4dd4-808c-ba8e1f9cec70/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 12:23:45,780 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_34ce422d-fb76-4dd4-808c-ba8e1f9cec70/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Waiting until timeout for monitored process [2023-12-02 12:23:45,836 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 12:23:45,837 INFO L262 TraceCheckSpWp]: Trace formula consists of 177 conjuncts, 23 conjunts are in the unsatisfiable core [2023-12-02 12:23:45,840 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 12:23:45,944 INFO L134 CoverageAnalysis]: Checked inductivity of 96 backedges. 20 proven. 7 refuted. 0 times theorem prover too weak. 69 trivial. 0 not checked. [2023-12-02 12:23:45,944 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-12-02 12:23:46,014 INFO L134 CoverageAnalysis]: Checked inductivity of 96 backedges. 20 proven. 0 refuted. 0 times theorem prover too weak. 76 trivial. 0 not checked. [2023-12-02 12:23:46,014 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 12:23:46,014 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1202605060] [2023-12-02 12:23:46,014 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2023-12-02 12:23:46,014 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1517504973] [2023-12-02 12:23:46,014 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1517504973] provided 1 perfect and 1 imperfect interpolant sequences [2023-12-02 12:23:46,014 INFO L185 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2023-12-02 12:23:46,014 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [11] total 14 [2023-12-02 12:23:46,015 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2146114775] [2023-12-02 12:23:46,015 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-12-02 12:23:46,015 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2023-12-02 12:23:46,015 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 12:23:46,016 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2023-12-02 12:23:46,016 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=31, Invalid=151, Unknown=0, NotChecked=0, Total=182 [2023-12-02 12:23:46,016 INFO L87 Difference]: Start difference. First operand 207 states and 278 transitions. Second operand has 5 states, 5 states have (on average 4.6) internal successors, (23), 4 states have internal predecessors, (23), 2 states have call successors, (11), 2 states have call predecessors, (11), 1 states have return successors, (10), 2 states have call predecessors, (10), 2 states have call successors, (10) [2023-12-02 12:23:46,252 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 12:23:46,252 INFO L93 Difference]: Finished difference Result 236 states and 318 transitions. [2023-12-02 12:23:46,252 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2023-12-02 12:23:46,253 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 4.6) internal successors, (23), 4 states have internal predecessors, (23), 2 states have call successors, (11), 2 states have call predecessors, (11), 1 states have return successors, (10), 2 states have call predecessors, (10), 2 states have call successors, (10) Word has length 64 [2023-12-02 12:23:46,253 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 12:23:46,254 INFO L225 Difference]: With dead ends: 236 [2023-12-02 12:23:46,254 INFO L226 Difference]: Without dead ends: 234 [2023-12-02 12:23:46,255 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 127 GetRequests, 114 SyntacticMatches, 0 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 25 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=35, Invalid=175, Unknown=0, NotChecked=0, Total=210 [2023-12-02 12:23:46,255 INFO L413 NwaCegarLoop]: 29 mSDtfsCounter, 7 mSDsluCounter, 73 mSDsCounter, 0 mSdLazyCounter, 49 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 9 SdHoareTripleChecker+Valid, 102 SdHoareTripleChecker+Invalid, 50 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 49 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2023-12-02 12:23:46,255 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [9 Valid, 102 Invalid, 50 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 49 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2023-12-02 12:23:46,256 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 234 states. [2023-12-02 12:23:46,404 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 234 to 230. [2023-12-02 12:23:46,405 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 230 states, 141 states have (on average 1.1843971631205674) internal successors, (167), 142 states have internal predecessors, (167), 73 states have call successors, (73), 15 states have call predecessors, (73), 15 states have return successors, (72), 72 states have call predecessors, (72), 72 states have call successors, (72) [2023-12-02 12:23:46,407 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 230 states to 230 states and 312 transitions. [2023-12-02 12:23:46,407 INFO L78 Accepts]: Start accepts. Automaton has 230 states and 312 transitions. Word has length 64 [2023-12-02 12:23:46,407 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 12:23:46,407 INFO L495 AbstractCegarLoop]: Abstraction has 230 states and 312 transitions. [2023-12-02 12:23:46,407 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 4.6) internal successors, (23), 4 states have internal predecessors, (23), 2 states have call successors, (11), 2 states have call predecessors, (11), 1 states have return successors, (10), 2 states have call predecessors, (10), 2 states have call successors, (10) [2023-12-02 12:23:46,407 INFO L276 IsEmpty]: Start isEmpty. Operand 230 states and 312 transitions. [2023-12-02 12:23:46,408 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 65 [2023-12-02 12:23:46,408 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 12:23:46,408 INFO L195 NwaCegarLoop]: trace histogram [6, 5, 5, 4, 4, 3, 3, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-12-02 12:23:46,413 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_34ce422d-fb76-4dd4-808c-ba8e1f9cec70/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Ended with exit code 0 [2023-12-02 12:23:46,609 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable11,13 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_34ce422d-fb76-4dd4-808c-ba8e1f9cec70/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 12:23:46,609 INFO L420 AbstractCegarLoop]: === Iteration 13 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 12:23:46,610 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 12:23:46,610 INFO L85 PathProgramCache]: Analyzing trace with hash 1508724982, now seen corresponding path program 5 times [2023-12-02 12:23:46,610 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 12:23:46,610 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [207965089] [2023-12-02 12:23:46,610 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 12:23:46,610 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 12:23:46,619 ERROR L246 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2023-12-02 12:23:46,619 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [357818085] [2023-12-02 12:23:46,619 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2023-12-02 12:23:46,619 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 12:23:46,619 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_34ce422d-fb76-4dd4-808c-ba8e1f9cec70/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 12:23:46,620 INFO L229 MonitoredProcess]: Starting monitored process 14 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_34ce422d-fb76-4dd4-808c-ba8e1f9cec70/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 12:23:46,621 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_34ce422d-fb76-4dd4-808c-ba8e1f9cec70/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (14)] Waiting until timeout for monitored process [2023-12-02 12:23:46,689 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2023-12-02 12:23:46,689 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-12-02 12:23:46,692 INFO L262 TraceCheckSpWp]: Trace formula consists of 153 conjuncts, 70 conjunts are in the unsatisfiable core [2023-12-02 12:23:46,694 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 12:23:47,538 INFO L134 CoverageAnalysis]: Checked inductivity of 84 backedges. 24 proven. 23 refuted. 0 times theorem prover too weak. 37 trivial. 0 not checked. [2023-12-02 12:23:47,538 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-12-02 12:23:49,386 INFO L134 CoverageAnalysis]: Checked inductivity of 84 backedges. 23 proven. 21 refuted. 0 times theorem prover too weak. 40 trivial. 0 not checked. [2023-12-02 12:23:49,386 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 12:23:49,387 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [207965089] [2023-12-02 12:23:49,387 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2023-12-02 12:23:49,387 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [357818085] [2023-12-02 12:23:49,387 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [357818085] provided 0 perfect and 2 imperfect interpolant sequences [2023-12-02 12:23:49,387 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [93931521] [2023-12-02 12:23:49,389 INFO L159 IcfgInterpreter]: Started Sifa with 27 locations of interest [2023-12-02 12:23:49,390 INFO L166 IcfgInterpreter]: Building call graph [2023-12-02 12:23:49,390 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-12-02 12:23:49,390 INFO L176 IcfgInterpreter]: Starting interpretation [2023-12-02 12:23:49,390 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-12-02 12:23:53,601 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 9 for LOIs [2023-12-02 12:23:53,606 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 3 for LOIs [2023-12-02 12:23:53,607 INFO L180 IcfgInterpreter]: Interpretation finished [2023-12-02 12:23:56,569 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '8534#(and (= |__VERIFIER_assert_#in~cond| 0) (= __VERIFIER_assert_~cond 0))' at error location [2023-12-02 12:23:56,569 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-12-02 12:23:56,569 INFO L185 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2023-12-02 12:23:56,569 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [18, 15] total 30 [2023-12-02 12:23:56,570 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [207301588] [2023-12-02 12:23:56,570 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2023-12-02 12:23:56,570 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 30 states [2023-12-02 12:23:56,570 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 12:23:56,571 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 30 interpolants. [2023-12-02 12:23:56,572 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=255, Invalid=2001, Unknown=0, NotChecked=0, Total=2256 [2023-12-02 12:23:56,573 INFO L87 Difference]: Start difference. First operand 230 states and 312 transitions. Second operand has 30 states, 27 states have (on average 2.185185185185185) internal successors, (59), 26 states have internal predecessors, (59), 7 states have call successors, (16), 3 states have call predecessors, (16), 3 states have return successors, (15), 6 states have call predecessors, (15), 5 states have call successors, (15) [2023-12-02 12:24:04,103 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 12:24:10,401 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 12:24:10,401 INFO L93 Difference]: Finished difference Result 323 states and 432 transitions. [2023-12-02 12:24:10,401 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 38 states. [2023-12-02 12:24:10,402 INFO L78 Accepts]: Start accepts. Automaton has has 30 states, 27 states have (on average 2.185185185185185) internal successors, (59), 26 states have internal predecessors, (59), 7 states have call successors, (16), 3 states have call predecessors, (16), 3 states have return successors, (15), 6 states have call predecessors, (15), 5 states have call successors, (15) Word has length 64 [2023-12-02 12:24:10,402 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 12:24:10,404 INFO L225 Difference]: With dead ends: 323 [2023-12-02 12:24:10,404 INFO L226 Difference]: Without dead ends: 321 [2023-12-02 12:24:10,407 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 220 GetRequests, 145 SyntacticMatches, 1 SemanticMatches, 74 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1713 ImplicationChecksByTransitivity, 10.7s TimeCoverageRelationStatistics Valid=803, Invalid=4897, Unknown=0, NotChecked=0, Total=5700 [2023-12-02 12:24:10,408 INFO L413 NwaCegarLoop]: 30 mSDtfsCounter, 254 mSDsluCounter, 404 mSDsCounter, 0 mSdLazyCounter, 744 mSolverCounterSat, 231 mSolverCounterUnsat, 1 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 7.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 254 SdHoareTripleChecker+Valid, 434 SdHoareTripleChecker+Invalid, 976 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 231 IncrementalHoareTripleChecker+Valid, 744 IncrementalHoareTripleChecker+Invalid, 1 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 7.2s IncrementalHoareTripleChecker+Time [2023-12-02 12:24:10,408 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [254 Valid, 434 Invalid, 976 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [231 Valid, 744 Invalid, 1 Unknown, 0 Unchecked, 7.2s Time] [2023-12-02 12:24:10,409 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 321 states. [2023-12-02 12:24:10,672 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 321 to 303. [2023-12-02 12:24:10,673 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 303 states, 190 states have (on average 1.1736842105263159) internal successors, (223), 193 states have internal predecessors, (223), 93 states have call successors, (93), 19 states have call predecessors, (93), 19 states have return successors, (92), 90 states have call predecessors, (92), 92 states have call successors, (92) [2023-12-02 12:24:10,676 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 303 states to 303 states and 408 transitions. [2023-12-02 12:24:10,676 INFO L78 Accepts]: Start accepts. Automaton has 303 states and 408 transitions. Word has length 64 [2023-12-02 12:24:10,676 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 12:24:10,676 INFO L495 AbstractCegarLoop]: Abstraction has 303 states and 408 transitions. [2023-12-02 12:24:10,676 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 30 states, 27 states have (on average 2.185185185185185) internal successors, (59), 26 states have internal predecessors, (59), 7 states have call successors, (16), 3 states have call predecessors, (16), 3 states have return successors, (15), 6 states have call predecessors, (15), 5 states have call successors, (15) [2023-12-02 12:24:10,677 INFO L276 IsEmpty]: Start isEmpty. Operand 303 states and 408 transitions. [2023-12-02 12:24:10,678 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 79 [2023-12-02 12:24:10,678 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 12:24:10,678 INFO L195 NwaCegarLoop]: trace histogram [9, 8, 8, 4, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-12-02 12:24:10,683 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_34ce422d-fb76-4dd4-808c-ba8e1f9cec70/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (14)] Ended with exit code 0 [2023-12-02 12:24:10,878 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable12,14 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_34ce422d-fb76-4dd4-808c-ba8e1f9cec70/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 12:24:10,879 INFO L420 AbstractCegarLoop]: === Iteration 14 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 12:24:10,879 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 12:24:10,879 INFO L85 PathProgramCache]: Analyzing trace with hash 1897496259, now seen corresponding path program 1 times [2023-12-02 12:24:10,879 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 12:24:10,879 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1798540389] [2023-12-02 12:24:10,879 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 12:24:10,880 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 12:24:10,886 ERROR L246 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2023-12-02 12:24:10,886 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1540535645] [2023-12-02 12:24:10,887 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 12:24:10,887 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 12:24:10,887 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_34ce422d-fb76-4dd4-808c-ba8e1f9cec70/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 12:24:10,888 INFO L229 MonitoredProcess]: Starting monitored process 15 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_34ce422d-fb76-4dd4-808c-ba8e1f9cec70/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 12:24:10,889 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_34ce422d-fb76-4dd4-808c-ba8e1f9cec70/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (15)] Waiting until timeout for monitored process [2023-12-02 12:24:10,957 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 12:24:10,960 INFO L262 TraceCheckSpWp]: Trace formula consists of 211 conjuncts, 76 conjunts are in the unsatisfiable core [2023-12-02 12:24:10,963 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 12:24:11,882 INFO L134 CoverageAnalysis]: Checked inductivity of 159 backedges. 32 proven. 27 refuted. 0 times theorem prover too weak. 100 trivial. 0 not checked. [2023-12-02 12:24:11,882 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-12-02 12:24:20,277 INFO L134 CoverageAnalysis]: Checked inductivity of 159 backedges. 30 proven. 26 refuted. 0 times theorem prover too weak. 103 trivial. 0 not checked. [2023-12-02 12:24:20,277 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 12:24:20,277 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1798540389] [2023-12-02 12:24:20,277 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2023-12-02 12:24:20,277 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1540535645] [2023-12-02 12:24:20,278 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1540535645] provided 0 perfect and 2 imperfect interpolant sequences [2023-12-02 12:24:20,278 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1932683477] [2023-12-02 12:24:20,280 INFO L159 IcfgInterpreter]: Started Sifa with 28 locations of interest [2023-12-02 12:24:20,280 INFO L166 IcfgInterpreter]: Building call graph [2023-12-02 12:24:20,281 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-12-02 12:24:20,281 INFO L176 IcfgInterpreter]: Starting interpretation [2023-12-02 12:24:20,281 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-12-02 12:24:22,947 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 1 for LOIs [2023-12-02 12:24:22,950 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 3 for LOIs [2023-12-02 12:24:22,952 INFO L180 IcfgInterpreter]: Interpretation finished [2023-12-02 12:24:27,306 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '10072#(and (= |__VERIFIER_assert_#in~cond| 0) (= __VERIFIER_assert_~cond 0))' at error location [2023-12-02 12:24:27,306 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-12-02 12:24:27,306 INFO L185 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2023-12-02 12:24:27,306 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [19, 16] total 32 [2023-12-02 12:24:27,307 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1862099373] [2023-12-02 12:24:27,307 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2023-12-02 12:24:27,307 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 32 states [2023-12-02 12:24:27,307 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 12:24:27,308 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 32 interpolants. [2023-12-02 12:24:27,310 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=233, Invalid=2023, Unknown=0, NotChecked=0, Total=2256 [2023-12-02 12:24:27,310 INFO L87 Difference]: Start difference. First operand 303 states and 408 transitions. Second operand has 32 states, 29 states have (on average 1.9655172413793103) internal successors, (57), 30 states have internal predecessors, (57), 9 states have call successors, (23), 3 states have call predecessors, (23), 3 states have return successors, (22), 7 states have call predecessors, (22), 7 states have call successors, (22) [2023-12-02 12:25:00,672 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 12:25:00,672 INFO L93 Difference]: Finished difference Result 494 states and 685 transitions. [2023-12-02 12:25:00,673 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 58 states. [2023-12-02 12:25:00,673 INFO L78 Accepts]: Start accepts. Automaton has has 32 states, 29 states have (on average 1.9655172413793103) internal successors, (57), 30 states have internal predecessors, (57), 9 states have call successors, (23), 3 states have call predecessors, (23), 3 states have return successors, (22), 7 states have call predecessors, (22), 7 states have call successors, (22) Word has length 78 [2023-12-02 12:25:00,673 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 12:25:00,676 INFO L225 Difference]: With dead ends: 494 [2023-12-02 12:25:00,676 INFO L226 Difference]: Without dead ends: 490 [2023-12-02 12:25:00,679 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 281 GetRequests, 186 SyntacticMatches, 1 SemanticMatches, 94 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2756 ImplicationChecksByTransitivity, 26.7s TimeCoverageRelationStatistics Valid=1368, Invalid=7752, Unknown=0, NotChecked=0, Total=9120 [2023-12-02 12:25:00,679 INFO L413 NwaCegarLoop]: 46 mSDtfsCounter, 281 mSDsluCounter, 720 mSDsCounter, 0 mSdLazyCounter, 1406 mSolverCounterSat, 274 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 12.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 281 SdHoareTripleChecker+Valid, 766 SdHoareTripleChecker+Invalid, 1680 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 274 IncrementalHoareTripleChecker+Valid, 1406 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 12.7s IncrementalHoareTripleChecker+Time [2023-12-02 12:25:00,680 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [281 Valid, 766 Invalid, 1680 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [274 Valid, 1406 Invalid, 0 Unknown, 0 Unchecked, 12.7s Time] [2023-12-02 12:25:00,680 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 490 states. [2023-12-02 12:25:01,202 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 490 to 466. [2023-12-02 12:25:01,203 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 466 states, 294 states have (on average 1.1870748299319729) internal successors, (349), 298 states have internal predecessors, (349), 147 states have call successors, (147), 24 states have call predecessors, (147), 24 states have return successors, (146), 143 states have call predecessors, (146), 146 states have call successors, (146) [2023-12-02 12:25:01,206 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 466 states to 466 states and 642 transitions. [2023-12-02 12:25:01,206 INFO L78 Accepts]: Start accepts. Automaton has 466 states and 642 transitions. Word has length 78 [2023-12-02 12:25:01,206 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 12:25:01,206 INFO L495 AbstractCegarLoop]: Abstraction has 466 states and 642 transitions. [2023-12-02 12:25:01,206 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 32 states, 29 states have (on average 1.9655172413793103) internal successors, (57), 30 states have internal predecessors, (57), 9 states have call successors, (23), 3 states have call predecessors, (23), 3 states have return successors, (22), 7 states have call predecessors, (22), 7 states have call successors, (22) [2023-12-02 12:25:01,207 INFO L276 IsEmpty]: Start isEmpty. Operand 466 states and 642 transitions. [2023-12-02 12:25:01,208 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 82 [2023-12-02 12:25:01,208 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 12:25:01,208 INFO L195 NwaCegarLoop]: trace histogram [11, 10, 10, 4, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-12-02 12:25:01,213 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_34ce422d-fb76-4dd4-808c-ba8e1f9cec70/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (15)] Ended with exit code 0 [2023-12-02 12:25:01,408 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 15 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_34ce422d-fb76-4dd4-808c-ba8e1f9cec70/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable13 [2023-12-02 12:25:01,409 INFO L420 AbstractCegarLoop]: === Iteration 15 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 12:25:01,409 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 12:25:01,409 INFO L85 PathProgramCache]: Analyzing trace with hash -1729932497, now seen corresponding path program 1 times [2023-12-02 12:25:01,409 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 12:25:01,409 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [633332505] [2023-12-02 12:25:01,409 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 12:25:01,410 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 12:25:01,419 ERROR L246 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2023-12-02 12:25:01,419 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [609920615] [2023-12-02 12:25:01,419 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 12:25:01,420 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 12:25:01,420 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_34ce422d-fb76-4dd4-808c-ba8e1f9cec70/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 12:25:01,421 INFO L229 MonitoredProcess]: Starting monitored process 16 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_34ce422d-fb76-4dd4-808c-ba8e1f9cec70/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 12:25:01,422 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_34ce422d-fb76-4dd4-808c-ba8e1f9cec70/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (16)] Waiting until timeout for monitored process [2023-12-02 12:25:01,491 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 12:25:01,492 INFO L262 TraceCheckSpWp]: Trace formula consists of 199 conjuncts, 31 conjunts are in the unsatisfiable core [2023-12-02 12:25:01,495 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 12:25:01,767 INFO L134 CoverageAnalysis]: Checked inductivity of 228 backedges. 22 proven. 17 refuted. 0 times theorem prover too weak. 189 trivial. 0 not checked. [2023-12-02 12:25:01,767 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-12-02 12:25:03,032 INFO L134 CoverageAnalysis]: Checked inductivity of 228 backedges. 22 proven. 14 refuted. 0 times theorem prover too weak. 192 trivial. 0 not checked. [2023-12-02 12:25:03,032 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 12:25:03,032 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [633332505] [2023-12-02 12:25:03,033 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2023-12-02 12:25:03,033 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [609920615] [2023-12-02 12:25:03,033 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [609920615] provided 0 perfect and 2 imperfect interpolant sequences [2023-12-02 12:25:03,033 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [2090203666] [2023-12-02 12:25:03,035 INFO L159 IcfgInterpreter]: Started Sifa with 26 locations of interest [2023-12-02 12:25:03,035 INFO L166 IcfgInterpreter]: Building call graph [2023-12-02 12:25:03,035 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-12-02 12:25:03,035 INFO L176 IcfgInterpreter]: Starting interpretation [2023-12-02 12:25:03,035 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-12-02 12:25:04,485 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 1 for LOIs [2023-12-02 12:25:04,489 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 3 for LOIs [2023-12-02 12:25:04,489 INFO L180 IcfgInterpreter]: Interpretation finished [2023-12-02 12:25:06,231 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '12183#(and (= |__VERIFIER_assert_#in~cond| 0) (= __VERIFIER_assert_~cond 0))' at error location [2023-12-02 12:25:06,231 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-12-02 12:25:06,232 INFO L185 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2023-12-02 12:25:06,232 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 10] total 20 [2023-12-02 12:25:06,232 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2142316892] [2023-12-02 12:25:06,232 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2023-12-02 12:25:06,233 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 20 states [2023-12-02 12:25:06,233 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 12:25:06,233 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2023-12-02 12:25:06,234 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=152, Invalid=1108, Unknown=0, NotChecked=0, Total=1260 [2023-12-02 12:25:06,234 INFO L87 Difference]: Start difference. First operand 466 states and 642 transitions. Second operand has 20 states, 19 states have (on average 1.9473684210526316) internal successors, (37), 17 states have internal predecessors, (37), 8 states have call successors, (27), 3 states have call predecessors, (27), 2 states have return successors, (26), 8 states have call predecessors, (26), 8 states have call successors, (26) [2023-12-02 12:25:09,764 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 12:25:09,764 INFO L93 Difference]: Finished difference Result 892 states and 1344 transitions. [2023-12-02 12:25:09,765 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 26 states. [2023-12-02 12:25:09,765 INFO L78 Accepts]: Start accepts. Automaton has has 20 states, 19 states have (on average 1.9473684210526316) internal successors, (37), 17 states have internal predecessors, (37), 8 states have call successors, (27), 3 states have call predecessors, (27), 2 states have return successors, (26), 8 states have call predecessors, (26), 8 states have call successors, (26) Word has length 81 [2023-12-02 12:25:09,766 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 12:25:09,770 INFO L225 Difference]: With dead ends: 892 [2023-12-02 12:25:09,770 INFO L226 Difference]: Without dead ends: 890 [2023-12-02 12:25:09,772 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 261 GetRequests, 207 SyntacticMatches, 0 SemanticMatches, 54 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 808 ImplicationChecksByTransitivity, 3.5s TimeCoverageRelationStatistics Valid=439, Invalid=2641, Unknown=0, NotChecked=0, Total=3080 [2023-12-02 12:25:09,772 INFO L413 NwaCegarLoop]: 39 mSDtfsCounter, 147 mSDsluCounter, 267 mSDsCounter, 0 mSdLazyCounter, 310 mSolverCounterSat, 137 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.7s Time, 0 mProtectedPredicate, 0 mProtectedAction, 151 SdHoareTripleChecker+Valid, 306 SdHoareTripleChecker+Invalid, 447 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 137 IncrementalHoareTripleChecker+Valid, 310 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.7s IncrementalHoareTripleChecker+Time [2023-12-02 12:25:09,772 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [151 Valid, 306 Invalid, 447 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [137 Valid, 310 Invalid, 0 Unknown, 0 Unchecked, 0.7s Time] [2023-12-02 12:25:09,773 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 890 states. [2023-12-02 12:25:11,105 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 890 to 836. [2023-12-02 12:25:11,107 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 836 states, 444 states have (on average 1.268018018018018) internal successors, (563), 448 states have internal predecessors, (563), 363 states have call successors, (363), 28 states have call predecessors, (363), 28 states have return successors, (362), 359 states have call predecessors, (362), 362 states have call successors, (362) [2023-12-02 12:25:11,111 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 836 states to 836 states and 1288 transitions. [2023-12-02 12:25:11,111 INFO L78 Accepts]: Start accepts. Automaton has 836 states and 1288 transitions. Word has length 81 [2023-12-02 12:25:11,111 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 12:25:11,112 INFO L495 AbstractCegarLoop]: Abstraction has 836 states and 1288 transitions. [2023-12-02 12:25:11,112 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 20 states, 19 states have (on average 1.9473684210526316) internal successors, (37), 17 states have internal predecessors, (37), 8 states have call successors, (27), 3 states have call predecessors, (27), 2 states have return successors, (26), 8 states have call predecessors, (26), 8 states have call successors, (26) [2023-12-02 12:25:11,112 INFO L276 IsEmpty]: Start isEmpty. Operand 836 states and 1288 transitions. [2023-12-02 12:25:11,114 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 87 [2023-12-02 12:25:11,114 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 12:25:11,114 INFO L195 NwaCegarLoop]: trace histogram [9, 8, 8, 5, 4, 4, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-12-02 12:25:11,119 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_34ce422d-fb76-4dd4-808c-ba8e1f9cec70/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (16)] Ended with exit code 0 [2023-12-02 12:25:11,314 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 16 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_34ce422d-fb76-4dd4-808c-ba8e1f9cec70/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable14 [2023-12-02 12:25:11,315 INFO L420 AbstractCegarLoop]: === Iteration 16 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 12:25:11,315 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 12:25:11,315 INFO L85 PathProgramCache]: Analyzing trace with hash 1618080332, now seen corresponding path program 2 times [2023-12-02 12:25:11,315 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 12:25:11,315 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [704134128] [2023-12-02 12:25:11,315 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 12:25:11,315 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 12:25:11,324 ERROR L246 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2023-12-02 12:25:11,324 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1941109393] [2023-12-02 12:25:11,324 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2023-12-02 12:25:11,324 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 12:25:11,324 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_34ce422d-fb76-4dd4-808c-ba8e1f9cec70/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 12:25:11,325 INFO L229 MonitoredProcess]: Starting monitored process 17 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_34ce422d-fb76-4dd4-808c-ba8e1f9cec70/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 12:25:11,326 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_34ce422d-fb76-4dd4-808c-ba8e1f9cec70/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (17)] Waiting until timeout for monitored process [2023-12-02 12:25:11,376 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2023-12-02 12:25:11,376 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-12-02 12:25:11,377 INFO L262 TraceCheckSpWp]: Trace formula consists of 134 conjuncts, 8 conjunts are in the unsatisfiable core [2023-12-02 12:25:11,378 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 12:25:11,420 INFO L134 CoverageAnalysis]: Checked inductivity of 182 backedges. 45 proven. 5 refuted. 0 times theorem prover too weak. 132 trivial. 0 not checked. [2023-12-02 12:25:11,420 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-12-02 12:25:11,476 INFO L134 CoverageAnalysis]: Checked inductivity of 182 backedges. 45 proven. 5 refuted. 0 times theorem prover too weak. 132 trivial. 0 not checked. [2023-12-02 12:25:11,476 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 12:25:11,476 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [704134128] [2023-12-02 12:25:11,476 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2023-12-02 12:25:11,477 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1941109393] [2023-12-02 12:25:11,477 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1941109393] provided 0 perfect and 2 imperfect interpolant sequences [2023-12-02 12:25:11,477 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [2016578069] [2023-12-02 12:25:11,479 INFO L159 IcfgInterpreter]: Started Sifa with 28 locations of interest [2023-12-02 12:25:11,479 INFO L166 IcfgInterpreter]: Building call graph [2023-12-02 12:25:11,479 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-12-02 12:25:11,479 INFO L176 IcfgInterpreter]: Starting interpretation [2023-12-02 12:25:11,479 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-12-02 12:25:15,270 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 1 for LOIs [2023-12-02 12:25:15,273 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 3 for LOIs [2023-12-02 12:25:15,274 INFO L180 IcfgInterpreter]: Interpretation finished [2023-12-02 12:25:15,737 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '15579#(and (= |__VERIFIER_assert_#in~cond| 0) (= __VERIFIER_assert_~cond 0))' at error location [2023-12-02 12:25:15,737 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-12-02 12:25:15,737 INFO L185 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2023-12-02 12:25:15,738 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8] total 8 [2023-12-02 12:25:15,738 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1689792267] [2023-12-02 12:25:15,738 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2023-12-02 12:25:15,738 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2023-12-02 12:25:15,738 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 12:25:15,739 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2023-12-02 12:25:15,739 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=78, Invalid=522, Unknown=0, NotChecked=0, Total=600 [2023-12-02 12:25:15,739 INFO L87 Difference]: Start difference. First operand 836 states and 1288 transitions. Second operand has 8 states, 8 states have (on average 4.125) internal successors, (33), 8 states have internal predecessors, (33), 3 states have call successors, (13), 2 states have call predecessors, (13), 1 states have return successors, (12), 2 states have call predecessors, (12), 2 states have call successors, (12) [2023-12-02 12:25:17,626 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 12:25:17,626 INFO L93 Difference]: Finished difference Result 995 states and 1535 transitions. [2023-12-02 12:25:17,626 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2023-12-02 12:25:17,627 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 8 states have (on average 4.125) internal successors, (33), 8 states have internal predecessors, (33), 3 states have call successors, (13), 2 states have call predecessors, (13), 1 states have return successors, (12), 2 states have call predecessors, (12), 2 states have call successors, (12) Word has length 86 [2023-12-02 12:25:17,627 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 12:25:17,634 INFO L225 Difference]: With dead ends: 995 [2023-12-02 12:25:17,634 INFO L226 Difference]: Without dead ends: 988 [2023-12-02 12:25:17,635 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 270 GetRequests, 231 SyntacticMatches, 5 SemanticMatches, 34 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 239 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=158, Invalid=1102, Unknown=0, NotChecked=0, Total=1260 [2023-12-02 12:25:17,635 INFO L413 NwaCegarLoop]: 56 mSDtfsCounter, 56 mSDsluCounter, 241 mSDsCounter, 0 mSdLazyCounter, 156 mSolverCounterSat, 44 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 60 SdHoareTripleChecker+Valid, 297 SdHoareTripleChecker+Invalid, 200 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 44 IncrementalHoareTripleChecker+Valid, 156 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2023-12-02 12:25:17,636 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [60 Valid, 297 Invalid, 200 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [44 Valid, 156 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2023-12-02 12:25:17,637 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 988 states. [2023-12-02 12:25:18,871 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 988 to 791. [2023-12-02 12:25:18,873 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 791 states, 409 states have (on average 1.2811735941320292) internal successors, (524), 412 states have internal predecessors, (524), 353 states have call successors, (353), 28 states have call predecessors, (353), 28 states have return successors, (352), 350 states have call predecessors, (352), 352 states have call successors, (352) [2023-12-02 12:25:18,879 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 791 states to 791 states and 1229 transitions. [2023-12-02 12:25:18,879 INFO L78 Accepts]: Start accepts. Automaton has 791 states and 1229 transitions. Word has length 86 [2023-12-02 12:25:18,880 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 12:25:18,880 INFO L495 AbstractCegarLoop]: Abstraction has 791 states and 1229 transitions. [2023-12-02 12:25:18,880 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 8 states, 8 states have (on average 4.125) internal successors, (33), 8 states have internal predecessors, (33), 3 states have call successors, (13), 2 states have call predecessors, (13), 1 states have return successors, (12), 2 states have call predecessors, (12), 2 states have call successors, (12) [2023-12-02 12:25:18,880 INFO L276 IsEmpty]: Start isEmpty. Operand 791 states and 1229 transitions. [2023-12-02 12:25:18,882 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 99 [2023-12-02 12:25:18,882 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 12:25:18,882 INFO L195 NwaCegarLoop]: trace histogram [13, 12, 12, 4, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-12-02 12:25:18,886 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_34ce422d-fb76-4dd4-808c-ba8e1f9cec70/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (17)] Ended with exit code 0 [2023-12-02 12:25:19,083 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 17 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_34ce422d-fb76-4dd4-808c-ba8e1f9cec70/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable15 [2023-12-02 12:25:19,083 INFO L420 AbstractCegarLoop]: === Iteration 17 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 12:25:19,083 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 12:25:19,083 INFO L85 PathProgramCache]: Analyzing trace with hash 355863159, now seen corresponding path program 2 times [2023-12-02 12:25:19,083 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 12:25:19,084 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1793752940] [2023-12-02 12:25:19,084 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 12:25:19,084 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 12:25:19,091 ERROR L246 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2023-12-02 12:25:19,091 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [181204249] [2023-12-02 12:25:19,091 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2023-12-02 12:25:19,091 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 12:25:19,091 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_34ce422d-fb76-4dd4-808c-ba8e1f9cec70/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 12:25:19,092 INFO L229 MonitoredProcess]: Starting monitored process 18 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_34ce422d-fb76-4dd4-808c-ba8e1f9cec70/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 12:25:19,093 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_34ce422d-fb76-4dd4-808c-ba8e1f9cec70/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (18)] Waiting until timeout for monitored process [2023-12-02 12:25:19,153 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 5 check-sat command(s) [2023-12-02 12:25:19,153 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-12-02 12:25:19,154 INFO L262 TraceCheckSpWp]: Trace formula consists of 185 conjuncts, 62 conjunts are in the unsatisfiable core [2023-12-02 12:25:19,158 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 12:25:20,114 INFO L134 CoverageAnalysis]: Checked inductivity of 327 backedges. 27 proven. 27 refuted. 0 times theorem prover too weak. 273 trivial. 0 not checked. [2023-12-02 12:25:20,114 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-12-02 12:25:22,562 INFO L134 CoverageAnalysis]: Checked inductivity of 327 backedges. 24 proven. 27 refuted. 0 times theorem prover too weak. 276 trivial. 0 not checked. [2023-12-02 12:25:22,562 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 12:25:22,562 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1793752940] [2023-12-02 12:25:22,562 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2023-12-02 12:25:22,562 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [181204249] [2023-12-02 12:25:22,562 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [181204249] provided 0 perfect and 2 imperfect interpolant sequences [2023-12-02 12:25:22,562 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [655809698] [2023-12-02 12:25:22,564 INFO L159 IcfgInterpreter]: Started Sifa with 28 locations of interest [2023-12-02 12:25:22,564 INFO L166 IcfgInterpreter]: Building call graph [2023-12-02 12:25:22,564 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-12-02 12:25:22,565 INFO L176 IcfgInterpreter]: Starting interpretation [2023-12-02 12:25:22,565 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-12-02 12:25:25,105 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 1 for LOIs [2023-12-02 12:25:25,107 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 3 for LOIs [2023-12-02 12:25:25,108 INFO L180 IcfgInterpreter]: Interpretation finished [2023-12-02 12:25:29,499 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '19183#(and (= |__VERIFIER_assert_#in~cond| 0) (= __VERIFIER_assert_~cond 0))' at error location [2023-12-02 12:25:29,499 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-12-02 12:25:29,499 INFO L185 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2023-12-02 12:25:29,499 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 14] total 28 [2023-12-02 12:25:29,500 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [755200332] [2023-12-02 12:25:29,500 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2023-12-02 12:25:29,500 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 28 states [2023-12-02 12:25:29,500 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 12:25:29,501 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 28 interpolants. [2023-12-02 12:25:29,502 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=199, Invalid=1781, Unknown=0, NotChecked=0, Total=1980 [2023-12-02 12:25:29,503 INFO L87 Difference]: Start difference. First operand 791 states and 1229 transitions. Second operand has 28 states, 25 states have (on average 2.08) internal successors, (52), 25 states have internal predecessors, (52), 9 states have call successors, (30), 3 states have call predecessors, (30), 2 states have return successors, (29), 8 states have call predecessors, (29), 7 states have call successors, (29) [2023-12-02 12:25:52,271 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 12:26:19,874 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 12:26:19,874 INFO L93 Difference]: Finished difference Result 1133 states and 1746 transitions. [2023-12-02 12:26:19,875 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 68 states. [2023-12-02 12:26:19,875 INFO L78 Accepts]: Start accepts. Automaton has has 28 states, 25 states have (on average 2.08) internal successors, (52), 25 states have internal predecessors, (52), 9 states have call successors, (30), 3 states have call predecessors, (30), 2 states have return successors, (29), 8 states have call predecessors, (29), 7 states have call successors, (29) Word has length 98 [2023-12-02 12:26:19,875 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 12:26:19,882 INFO L225 Difference]: With dead ends: 1133 [2023-12-02 12:26:19,882 INFO L226 Difference]: Without dead ends: 1125 [2023-12-02 12:26:19,887 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 352 GetRequests, 249 SyntacticMatches, 0 SemanticMatches, 103 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3181 ImplicationChecksByTransitivity, 40.6s TimeCoverageRelationStatistics Valid=1567, Invalid=9353, Unknown=0, NotChecked=0, Total=10920 [2023-12-02 12:26:19,888 INFO L413 NwaCegarLoop]: 44 mSDtfsCounter, 262 mSDsluCounter, 609 mSDsCounter, 0 mSdLazyCounter, 1157 mSolverCounterSat, 266 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 13.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 262 SdHoareTripleChecker+Valid, 653 SdHoareTripleChecker+Invalid, 1423 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 266 IncrementalHoareTripleChecker+Valid, 1157 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 13.2s IncrementalHoareTripleChecker+Time [2023-12-02 12:26:19,888 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [262 Valid, 653 Invalid, 1423 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [266 Valid, 1157 Invalid, 0 Unknown, 0 Unchecked, 13.2s Time] [2023-12-02 12:26:19,889 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1125 states. [2023-12-02 12:26:21,492 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1125 to 973. [2023-12-02 12:26:21,495 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 973 states, 504 states have (on average 1.2797619047619047) internal successors, (645), 507 states have internal predecessors, (645), 433 states have call successors, (433), 35 states have call predecessors, (433), 35 states have return successors, (432), 430 states have call predecessors, (432), 432 states have call successors, (432) [2023-12-02 12:26:21,511 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 973 states to 973 states and 1510 transitions. [2023-12-02 12:26:21,511 INFO L78 Accepts]: Start accepts. Automaton has 973 states and 1510 transitions. Word has length 98 [2023-12-02 12:26:21,511 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 12:26:21,512 INFO L495 AbstractCegarLoop]: Abstraction has 973 states and 1510 transitions. [2023-12-02 12:26:21,512 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 28 states, 25 states have (on average 2.08) internal successors, (52), 25 states have internal predecessors, (52), 9 states have call successors, (30), 3 states have call predecessors, (30), 2 states have return successors, (29), 8 states have call predecessors, (29), 7 states have call successors, (29) [2023-12-02 12:26:21,512 INFO L276 IsEmpty]: Start isEmpty. Operand 973 states and 1510 transitions. [2023-12-02 12:26:21,514 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 112 [2023-12-02 12:26:21,514 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 12:26:21,515 INFO L195 NwaCegarLoop]: trace histogram [14, 13, 13, 5, 4, 4, 4, 4, 4, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-12-02 12:26:21,519 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_34ce422d-fb76-4dd4-808c-ba8e1f9cec70/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (18)] Ended with exit code 0 [2023-12-02 12:26:21,715 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 18 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_34ce422d-fb76-4dd4-808c-ba8e1f9cec70/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable16 [2023-12-02 12:26:21,715 INFO L420 AbstractCegarLoop]: === Iteration 18 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 12:26:21,716 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 12:26:21,716 INFO L85 PathProgramCache]: Analyzing trace with hash 1435979099, now seen corresponding path program 1 times [2023-12-02 12:26:21,716 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 12:26:21,716 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [534822003] [2023-12-02 12:26:21,716 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 12:26:21,716 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 12:26:21,724 ERROR L246 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2023-12-02 12:26:21,724 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1477051700] [2023-12-02 12:26:21,724 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 12:26:21,724 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 12:26:21,725 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_34ce422d-fb76-4dd4-808c-ba8e1f9cec70/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 12:26:21,725 INFO L229 MonitoredProcess]: Starting monitored process 19 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_34ce422d-fb76-4dd4-808c-ba8e1f9cec70/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 12:26:21,726 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_34ce422d-fb76-4dd4-808c-ba8e1f9cec70/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (19)] Waiting until timeout for monitored process [2023-12-02 12:26:21,793 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 12:26:21,795 INFO L262 TraceCheckSpWp]: Trace formula consists of 278 conjuncts, 71 conjunts are in the unsatisfiable core [2023-12-02 12:26:21,798 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 12:26:23,091 INFO L134 CoverageAnalysis]: Checked inductivity of 405 backedges. 28 proven. 56 refuted. 0 times theorem prover too weak. 321 trivial. 0 not checked. [2023-12-02 12:26:23,091 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-12-02 12:26:26,190 INFO L134 CoverageAnalysis]: Checked inductivity of 405 backedges. 26 proven. 55 refuted. 0 times theorem prover too weak. 324 trivial. 0 not checked. [2023-12-02 12:26:26,190 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 12:26:26,190 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [534822003] [2023-12-02 12:26:26,190 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2023-12-02 12:26:26,190 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1477051700] [2023-12-02 12:26:26,190 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1477051700] provided 0 perfect and 2 imperfect interpolant sequences [2023-12-02 12:26:26,190 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [312430197] [2023-12-02 12:26:26,192 INFO L159 IcfgInterpreter]: Started Sifa with 27 locations of interest [2023-12-02 12:26:26,192 INFO L166 IcfgInterpreter]: Building call graph [2023-12-02 12:26:26,192 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-12-02 12:26:26,192 INFO L176 IcfgInterpreter]: Starting interpretation [2023-12-02 12:26:26,193 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-12-02 12:26:28,493 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 9 for LOIs [2023-12-02 12:26:28,497 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 3 for LOIs [2023-12-02 12:26:28,498 INFO L180 IcfgInterpreter]: Interpretation finished [2023-12-02 12:26:32,445 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '23489#(and (= |__VERIFIER_assert_#in~cond| 0) (= __VERIFIER_assert_~cond 0))' at error location [2023-12-02 12:26:32,445 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-12-02 12:26:32,445 INFO L185 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2023-12-02 12:26:32,445 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [18, 16] total 32 [2023-12-02 12:26:32,445 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [632108132] [2023-12-02 12:26:32,445 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2023-12-02 12:26:32,446 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 32 states [2023-12-02 12:26:32,446 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 12:26:32,447 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 32 interpolants. [2023-12-02 12:26:32,448 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=234, Invalid=2118, Unknown=0, NotChecked=0, Total=2352 [2023-12-02 12:26:32,448 INFO L87 Difference]: Start difference. First operand 973 states and 1510 transitions. Second operand has 32 states, 31 states have (on average 2.193548387096774) internal successors, (68), 29 states have internal predecessors, (68), 10 states have call successors, (33), 3 states have call predecessors, (33), 2 states have return successors, (32), 10 states have call predecessors, (32), 10 states have call successors, (32) [2023-12-02 12:26:41,551 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2023-12-02 12:26:43,554 WARN L539 Checker$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 12:27:32,678 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 12:27:32,678 INFO L93 Difference]: Finished difference Result 1478 states and 2294 transitions. [2023-12-02 12:27:32,679 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 61 states. [2023-12-02 12:27:32,679 INFO L78 Accepts]: Start accepts. Automaton has has 32 states, 31 states have (on average 2.193548387096774) internal successors, (68), 29 states have internal predecessors, (68), 10 states have call successors, (33), 3 states have call predecessors, (33), 2 states have return successors, (32), 10 states have call predecessors, (32), 10 states have call successors, (32) Word has length 111 [2023-12-02 12:27:32,679 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 12:27:32,686 INFO L225 Difference]: With dead ends: 1478 [2023-12-02 12:27:32,687 INFO L226 Difference]: Without dead ends: 1476 [2023-12-02 12:27:32,690 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 385 GetRequests, 284 SyntacticMatches, 2 SemanticMatches, 99 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2968 ImplicationChecksByTransitivity, 41.9s TimeCoverageRelationStatistics Valid=1474, Invalid=8626, Unknown=0, NotChecked=0, Total=10100 [2023-12-02 12:27:32,690 INFO L413 NwaCegarLoop]: 46 mSDtfsCounter, 337 mSDsluCounter, 757 mSDsCounter, 0 mSdLazyCounter, 1266 mSolverCounterSat, 353 mSolverCounterUnsat, 2 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 21.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 337 SdHoareTripleChecker+Valid, 803 SdHoareTripleChecker+Invalid, 1621 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 353 IncrementalHoareTripleChecker+Valid, 1266 IncrementalHoareTripleChecker+Invalid, 2 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 21.7s IncrementalHoareTripleChecker+Time [2023-12-02 12:27:32,690 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [337 Valid, 803 Invalid, 1621 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [353 Valid, 1266 Invalid, 2 Unknown, 0 Unchecked, 21.7s Time] [2023-12-02 12:27:32,692 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1476 states. [2023-12-02 12:27:35,064 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1476 to 1283. [2023-12-02 12:27:35,066 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1283 states, 670 states have (on average 1.282089552238806) internal successors, (859), 675 states have internal predecessors, (859), 569 states have call successors, (569), 43 states have call predecessors, (569), 43 states have return successors, (568), 564 states have call predecessors, (568), 568 states have call successors, (568) [2023-12-02 12:27:35,071 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1283 states to 1283 states and 1996 transitions. [2023-12-02 12:27:35,071 INFO L78 Accepts]: Start accepts. Automaton has 1283 states and 1996 transitions. Word has length 111 [2023-12-02 12:27:35,072 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 12:27:35,072 INFO L495 AbstractCegarLoop]: Abstraction has 1283 states and 1996 transitions. [2023-12-02 12:27:35,072 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 32 states, 31 states have (on average 2.193548387096774) internal successors, (68), 29 states have internal predecessors, (68), 10 states have call successors, (33), 3 states have call predecessors, (33), 2 states have return successors, (32), 10 states have call predecessors, (32), 10 states have call successors, (32) [2023-12-02 12:27:35,072 INFO L276 IsEmpty]: Start isEmpty. Operand 1283 states and 1996 transitions. [2023-12-02 12:27:35,074 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 126 [2023-12-02 12:27:35,074 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 12:27:35,074 INFO L195 NwaCegarLoop]: trace histogram [17, 16, 16, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 3, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-12-02 12:27:35,080 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_34ce422d-fb76-4dd4-808c-ba8e1f9cec70/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (19)] Ended with exit code 0 [2023-12-02 12:27:35,275 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 19 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_34ce422d-fb76-4dd4-808c-ba8e1f9cec70/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable17 [2023-12-02 12:27:35,275 INFO L420 AbstractCegarLoop]: === Iteration 19 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 12:27:35,275 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 12:27:35,275 INFO L85 PathProgramCache]: Analyzing trace with hash -1702861936, now seen corresponding path program 3 times [2023-12-02 12:27:35,275 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 12:27:35,275 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1626843150] [2023-12-02 12:27:35,276 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 12:27:35,276 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 12:27:35,284 ERROR L246 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2023-12-02 12:27:35,284 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [850097191] [2023-12-02 12:27:35,284 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2023-12-02 12:27:35,284 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 12:27:35,284 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_34ce422d-fb76-4dd4-808c-ba8e1f9cec70/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 12:27:35,285 INFO L229 MonitoredProcess]: Starting monitored process 20 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_34ce422d-fb76-4dd4-808c-ba8e1f9cec70/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 12:27:35,286 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_34ce422d-fb76-4dd4-808c-ba8e1f9cec70/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (20)] Waiting until timeout for monitored process [2023-12-02 12:27:35,358 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2023-12-02 12:27:35,359 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-12-02 12:27:35,361 INFO L262 TraceCheckSpWp]: Trace formula consists of 270 conjuncts, 88 conjunts are in the unsatisfiable core [2023-12-02 12:27:35,364 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 12:27:36,535 INFO L134 CoverageAnalysis]: Checked inductivity of 580 backedges. 72 proven. 64 refuted. 0 times theorem prover too weak. 444 trivial. 0 not checked. [2023-12-02 12:27:36,535 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-12-02 12:27:47,714 INFO L134 CoverageAnalysis]: Checked inductivity of 580 backedges. 70 proven. 63 refuted. 0 times theorem prover too weak. 447 trivial. 0 not checked. [2023-12-02 12:27:47,714 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 12:27:47,714 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1626843150] [2023-12-02 12:27:47,714 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2023-12-02 12:27:47,714 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [850097191] [2023-12-02 12:27:47,714 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [850097191] provided 0 perfect and 2 imperfect interpolant sequences [2023-12-02 12:27:47,715 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1274483827] [2023-12-02 12:27:47,716 INFO L159 IcfgInterpreter]: Started Sifa with 28 locations of interest [2023-12-02 12:27:47,716 INFO L166 IcfgInterpreter]: Building call graph [2023-12-02 12:27:47,716 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-12-02 12:27:47,717 INFO L176 IcfgInterpreter]: Starting interpretation [2023-12-02 12:27:47,717 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-12-02 12:27:50,052 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 1 for LOIs [2023-12-02 12:27:50,055 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 3 for LOIs [2023-12-02 12:27:50,056 INFO L180 IcfgInterpreter]: Interpretation finished [2023-12-02 12:27:55,108 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '28961#(and (= |__VERIFIER_assert_#in~cond| 0) (= __VERIFIER_assert_~cond 0))' at error location [2023-12-02 12:27:55,108 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-12-02 12:27:55,108 INFO L185 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2023-12-02 12:27:55,108 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [21, 19] total 37 [2023-12-02 12:27:55,109 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2132697460] [2023-12-02 12:27:55,109 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2023-12-02 12:27:55,109 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 37 states [2023-12-02 12:27:55,109 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 12:27:55,110 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 37 interpolants. [2023-12-02 12:27:55,110 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=288, Invalid=2468, Unknown=0, NotChecked=0, Total=2756 [2023-12-02 12:27:55,111 INFO L87 Difference]: Start difference. First operand 1283 states and 1996 transitions. Second operand has 37 states, 34 states have (on average 2.088235294117647) internal successors, (71), 34 states have internal predecessors, (71), 13 states have call successors, (39), 3 states have call predecessors, (39), 3 states have return successors, (38), 11 states have call predecessors, (38), 11 states have call successors, (38) [2023-12-02 12:28:08,918 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 12:29:19,208 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 12:29:19,208 INFO L93 Difference]: Finished difference Result 1866 states and 2909 transitions. [2023-12-02 12:29:19,209 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 86 states. [2023-12-02 12:29:19,209 INFO L78 Accepts]: Start accepts. Automaton has has 37 states, 34 states have (on average 2.088235294117647) internal successors, (71), 34 states have internal predecessors, (71), 13 states have call successors, (39), 3 states have call predecessors, (39), 3 states have return successors, (38), 11 states have call predecessors, (38), 11 states have call successors, (38) Word has length 125 [2023-12-02 12:29:19,210 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 12:29:19,218 INFO L225 Difference]: With dead ends: 1866 [2023-12-02 12:29:19,218 INFO L226 Difference]: Without dead ends: 1858 [2023-12-02 12:29:19,221 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 450 GetRequests, 322 SyntacticMatches, 1 SemanticMatches, 127 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5159 ImplicationChecksByTransitivity, 64.6s TimeCoverageRelationStatistics Valid=2522, Invalid=13989, Unknown=1, NotChecked=0, Total=16512 [2023-12-02 12:29:19,221 INFO L413 NwaCegarLoop]: 58 mSDtfsCounter, 317 mSDsluCounter, 1160 mSDsCounter, 0 mSdLazyCounter, 1899 mSolverCounterSat, 346 mSolverCounterUnsat, 1 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 23.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 323 SdHoareTripleChecker+Valid, 1218 SdHoareTripleChecker+Invalid, 2246 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 346 IncrementalHoareTripleChecker+Valid, 1899 IncrementalHoareTripleChecker+Invalid, 1 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 23.6s IncrementalHoareTripleChecker+Time [2023-12-02 12:29:19,222 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [323 Valid, 1218 Invalid, 2246 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [346 Valid, 1899 Invalid, 1 Unknown, 0 Unchecked, 23.6s Time] [2023-12-02 12:29:19,223 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1858 states. [2023-12-02 12:29:22,764 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1858 to 1600. [2023-12-02 12:29:22,767 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1600 states, 837 states have (on average 1.2831541218637992) internal successors, (1074), 842 states have internal predecessors, (1074), 713 states have call successors, (713), 49 states have call predecessors, (713), 49 states have return successors, (712), 708 states have call predecessors, (712), 712 states have call successors, (712) [2023-12-02 12:29:22,773 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1600 states to 1600 states and 2499 transitions. [2023-12-02 12:29:22,773 INFO L78 Accepts]: Start accepts. Automaton has 1600 states and 2499 transitions. Word has length 125 [2023-12-02 12:29:22,774 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 12:29:22,774 INFO L495 AbstractCegarLoop]: Abstraction has 1600 states and 2499 transitions. [2023-12-02 12:29:22,774 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 37 states, 34 states have (on average 2.088235294117647) internal successors, (71), 34 states have internal predecessors, (71), 13 states have call successors, (39), 3 states have call predecessors, (39), 3 states have return successors, (38), 11 states have call predecessors, (38), 11 states have call successors, (38) [2023-12-02 12:29:22,774 INFO L276 IsEmpty]: Start isEmpty. Operand 1600 states and 2499 transitions. [2023-12-02 12:29:22,776 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 126 [2023-12-02 12:29:22,776 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 12:29:22,776 INFO L195 NwaCegarLoop]: trace histogram [17, 16, 16, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 3, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-12-02 12:29:22,781 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_34ce422d-fb76-4dd4-808c-ba8e1f9cec70/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (20)] Ended with exit code 0 [2023-12-02 12:29:22,977 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable18,20 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_34ce422d-fb76-4dd4-808c-ba8e1f9cec70/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 12:29:22,977 INFO L420 AbstractCegarLoop]: === Iteration 20 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 12:29:22,977 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 12:29:22,977 INFO L85 PathProgramCache]: Analyzing trace with hash -1054120344, now seen corresponding path program 4 times [2023-12-02 12:29:22,977 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 12:29:22,977 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1107824236] [2023-12-02 12:29:22,977 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 12:29:22,978 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 12:29:22,985 ERROR L246 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2023-12-02 12:29:22,985 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [851686659] [2023-12-02 12:29:22,985 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2023-12-02 12:29:22,985 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 12:29:22,986 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_34ce422d-fb76-4dd4-808c-ba8e1f9cec70/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 12:29:22,986 INFO L229 MonitoredProcess]: Starting monitored process 21 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_34ce422d-fb76-4dd4-808c-ba8e1f9cec70/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 12:29:22,987 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_34ce422d-fb76-4dd4-808c-ba8e1f9cec70/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (21)] Waiting until timeout for monitored process [2023-12-02 12:29:23,076 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 12:29:23,079 INFO L262 TraceCheckSpWp]: Trace formula consists of 301 conjuncts, 88 conjunts are in the unsatisfiable core [2023-12-02 12:29:23,082 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 12:29:24,363 INFO L134 CoverageAnalysis]: Checked inductivity of 580 backedges. 72 proven. 64 refuted. 0 times theorem prover too weak. 444 trivial. 0 not checked. [2023-12-02 12:29:24,363 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-12-02 12:29:41,632 INFO L134 CoverageAnalysis]: Checked inductivity of 580 backedges. 70 proven. 63 refuted. 0 times theorem prover too weak. 447 trivial. 0 not checked. [2023-12-02 12:29:41,632 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 12:29:41,632 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1107824236] [2023-12-02 12:29:41,632 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2023-12-02 12:29:41,632 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [851686659] [2023-12-02 12:29:41,632 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [851686659] provided 0 perfect and 2 imperfect interpolant sequences [2023-12-02 12:29:41,632 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [594743258] [2023-12-02 12:29:41,634 INFO L159 IcfgInterpreter]: Started Sifa with 28 locations of interest [2023-12-02 12:29:41,634 INFO L166 IcfgInterpreter]: Building call graph [2023-12-02 12:29:41,634 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-12-02 12:29:41,634 INFO L176 IcfgInterpreter]: Starting interpretation [2023-12-02 12:29:41,634 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-12-02 12:29:44,002 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 1 for LOIs [2023-12-02 12:29:44,005 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 3 for LOIs [2023-12-02 12:29:44,006 INFO L180 IcfgInterpreter]: Interpretation finished [2023-12-02 12:29:53,147 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '35658#(and (= |__VERIFIER_assert_#in~cond| 0) (= __VERIFIER_assert_~cond 0))' at error location [2023-12-02 12:29:53,147 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-12-02 12:29:53,147 INFO L185 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2023-12-02 12:29:53,147 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [21, 19] total 37 [2023-12-02 12:29:53,147 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [468515269] [2023-12-02 12:29:53,147 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2023-12-02 12:29:53,148 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 37 states [2023-12-02 12:29:53,148 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 12:29:53,149 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 37 interpolants. [2023-12-02 12:29:53,149 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=294, Invalid=2462, Unknown=0, NotChecked=0, Total=2756 [2023-12-02 12:29:53,149 INFO L87 Difference]: Start difference. First operand 1600 states and 2499 transitions. Second operand has 37 states, 34 states have (on average 2.088235294117647) internal successors, (71), 35 states have internal predecessors, (71), 13 states have call successors, (39), 3 states have call predecessors, (39), 3 states have return successors, (38), 11 states have call predecessors, (38), 11 states have call successors, (38) [2023-12-02 12:30:15,583 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.18s for a HTC check with result INVALID. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2023-12-02 12:30:17,598 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2023-12-02 12:30:21,301 WARN L539 Checker$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 12:30:22,657 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.36s for a HTC check with result INVALID. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2023-12-02 12:30:41,383 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.11s for a HTC check with result INVALID. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2023-12-02 12:30:59,729 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2023-12-02 12:31:01,733 WARN L539 Checker$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 12:31:15,778 WARN L293 SmtUtils]: Spent 8.59s on a formula simplification that was a NOOP. DAG size: 123 (called from [L 391] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2023-12-02 12:31:35,700 WARN L293 SmtUtils]: Spent 8.24s on a formula simplification. DAG size of input: 115 DAG size of output: 113 (called from [L 391] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2023-12-02 12:31:52,230 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2023-12-02 12:32:09,943 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.58s for a HTC check with result INVALID. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2023-12-02 12:32:12,575 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.36s for a HTC check with result INVALID. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2023-12-02 12:32:16,067 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 12:32:16,067 INFO L93 Difference]: Finished difference Result 1880 states and 2896 transitions. [2023-12-02 12:32:16,068 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 74 states. [2023-12-02 12:32:16,068 INFO L78 Accepts]: Start accepts. Automaton has has 37 states, 34 states have (on average 2.088235294117647) internal successors, (71), 35 states have internal predecessors, (71), 13 states have call successors, (39), 3 states have call predecessors, (39), 3 states have return successors, (38), 11 states have call predecessors, (38), 11 states have call successors, (38) Word has length 125 [2023-12-02 12:32:16,068 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 12:32:16,079 INFO L225 Difference]: With dead ends: 1880 [2023-12-02 12:32:16,079 INFO L226 Difference]: Without dead ends: 1872 [2023-12-02 12:32:16,081 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 438 GetRequests, 322 SyntacticMatches, 1 SemanticMatches, 115 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3955 ImplicationChecksByTransitivity, 106.3s TimeCoverageRelationStatistics Valid=2173, Invalid=11399, Unknown=0, NotChecked=0, Total=13572 [2023-12-02 12:32:16,082 INFO L413 NwaCegarLoop]: 57 mSDtfsCounter, 340 mSDsluCounter, 1059 mSDsCounter, 0 mSdLazyCounter, 1958 mSolverCounterSat, 374 mSolverCounterUnsat, 5 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 46.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 340 SdHoareTripleChecker+Valid, 1116 SdHoareTripleChecker+Invalid, 2337 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 374 IncrementalHoareTripleChecker+Valid, 1958 IncrementalHoareTripleChecker+Invalid, 5 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 46.4s IncrementalHoareTripleChecker+Time [2023-12-02 12:32:16,082 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [340 Valid, 1116 Invalid, 2337 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [374 Valid, 1958 Invalid, 5 Unknown, 0 Unchecked, 46.4s Time] [2023-12-02 12:32:16,084 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1872 states. [2023-12-02 12:32:21,572 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1872 to 1769. [2023-12-02 12:32:21,574 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1769 states, 925 states have (on average 1.2875675675675675) internal successors, (1191), 930 states have internal predecessors, (1191), 789 states have call successors, (789), 54 states have call predecessors, (789), 54 states have return successors, (788), 784 states have call predecessors, (788), 788 states have call successors, (788) [2023-12-02 12:32:21,584 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1769 states to 1769 states and 2768 transitions. [2023-12-02 12:32:21,584 INFO L78 Accepts]: Start accepts. Automaton has 1769 states and 2768 transitions. Word has length 125 [2023-12-02 12:32:21,584 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 12:32:21,584 INFO L495 AbstractCegarLoop]: Abstraction has 1769 states and 2768 transitions. [2023-12-02 12:32:21,584 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 37 states, 34 states have (on average 2.088235294117647) internal successors, (71), 35 states have internal predecessors, (71), 13 states have call successors, (39), 3 states have call predecessors, (39), 3 states have return successors, (38), 11 states have call predecessors, (38), 11 states have call successors, (38) [2023-12-02 12:32:21,584 INFO L276 IsEmpty]: Start isEmpty. Operand 1769 states and 2768 transitions. [2023-12-02 12:32:21,587 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 129 [2023-12-02 12:32:21,587 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 12:32:21,587 INFO L195 NwaCegarLoop]: trace histogram [17, 16, 16, 5, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 3, 3, 3, 3, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-12-02 12:32:21,593 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_34ce422d-fb76-4dd4-808c-ba8e1f9cec70/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (21)] Ended with exit code 0 [2023-12-02 12:32:21,787 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable19,21 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_34ce422d-fb76-4dd4-808c-ba8e1f9cec70/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 12:32:21,788 INFO L420 AbstractCegarLoop]: === Iteration 21 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 12:32:21,788 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 12:32:21,788 INFO L85 PathProgramCache]: Analyzing trace with hash 254217485, now seen corresponding path program 5 times [2023-12-02 12:32:21,788 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 12:32:21,788 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [862163999] [2023-12-02 12:32:21,788 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 12:32:21,788 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 12:32:21,797 ERROR L246 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2023-12-02 12:32:21,797 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1962259771] [2023-12-02 12:32:21,797 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2023-12-02 12:32:21,797 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 12:32:21,798 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_34ce422d-fb76-4dd4-808c-ba8e1f9cec70/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 12:32:21,798 INFO L229 MonitoredProcess]: Starting monitored process 22 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_34ce422d-fb76-4dd4-808c-ba8e1f9cec70/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 12:32:21,799 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_34ce422d-fb76-4dd4-808c-ba8e1f9cec70/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (22)] Waiting until timeout for monitored process [2023-12-02 12:32:21,863 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 5 check-sat command(s) [2023-12-02 12:32:21,864 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-12-02 12:32:21,866 INFO L262 TraceCheckSpWp]: Trace formula consists of 235 conjuncts, 87 conjunts are in the unsatisfiable core [2023-12-02 12:32:21,869 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 12:32:23,515 INFO L134 CoverageAnalysis]: Checked inductivity of 590 backedges. 35 proven. 66 refuted. 0 times theorem prover too weak. 489 trivial. 0 not checked. [2023-12-02 12:32:23,516 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-12-02 12:32:32,247 INFO L134 CoverageAnalysis]: Checked inductivity of 590 backedges. 32 proven. 66 refuted. 0 times theorem prover too weak. 492 trivial. 0 not checked. [2023-12-02 12:32:32,247 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 12:32:32,248 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [862163999] [2023-12-02 12:32:32,248 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2023-12-02 12:32:32,248 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1962259771] [2023-12-02 12:32:32,248 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1962259771] provided 0 perfect and 2 imperfect interpolant sequences [2023-12-02 12:32:32,248 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [898228504] [2023-12-02 12:32:32,249 INFO L159 IcfgInterpreter]: Started Sifa with 28 locations of interest [2023-12-02 12:32:32,249 INFO L166 IcfgInterpreter]: Building call graph [2023-12-02 12:32:32,250 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-12-02 12:32:32,250 INFO L176 IcfgInterpreter]: Starting interpretation [2023-12-02 12:32:32,250 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-12-02 12:32:34,864 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 1 for LOIs [2023-12-02 12:32:34,867 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 3 for LOIs [2023-12-02 12:32:34,867 INFO L180 IcfgInterpreter]: Interpretation finished [2023-12-02 12:32:39,399 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '42633#(and (= |__VERIFIER_assert_#in~cond| 0) (= __VERIFIER_assert_~cond 0))' at error location [2023-12-02 12:32:39,400 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-12-02 12:32:39,400 INFO L185 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2023-12-02 12:32:39,400 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [21, 18] total 37 [2023-12-02 12:32:39,400 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1260763690] [2023-12-02 12:32:39,400 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2023-12-02 12:32:39,401 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 37 states [2023-12-02 12:32:39,401 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 12:32:39,401 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 37 interpolants. [2023-12-02 12:32:39,402 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=280, Invalid=2582, Unknown=0, NotChecked=0, Total=2862 [2023-12-02 12:32:39,403 INFO L87 Difference]: Start difference. First operand 1769 states and 2768 transitions. Second operand has 37 states, 34 states have (on average 2.1176470588235294) internal successors, (72), 34 states have internal predecessors, (72), 11 states have call successors, (38), 3 states have call predecessors, (38), 2 states have return successors, (37), 10 states have call predecessors, (37), 9 states have call successors, (37) [2023-12-02 12:33:29,940 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.58s for a HTC check with result INVALID. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2023-12-02 12:35:12,774 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 12:35:12,774 INFO L93 Difference]: Finished difference Result 2313 states and 3589 transitions. [2023-12-02 12:35:12,774 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 113 states. [2023-12-02 12:35:12,775 INFO L78 Accepts]: Start accepts. Automaton has has 37 states, 34 states have (on average 2.1176470588235294) internal successors, (72), 34 states have internal predecessors, (72), 11 states have call successors, (38), 3 states have call predecessors, (38), 2 states have return successors, (37), 10 states have call predecessors, (37), 9 states have call successors, (37) Word has length 128 [2023-12-02 12:35:12,775 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 12:35:12,786 INFO L225 Difference]: With dead ends: 2313 [2023-12-02 12:35:12,786 INFO L226 Difference]: Without dead ends: 2305 [2023-12-02 12:35:12,789 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 486 GetRequests, 330 SyntacticMatches, 0 SemanticMatches, 156 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 7988 ImplicationChecksByTransitivity, 126.9s TimeCoverageRelationStatistics Valid=3633, Invalid=21172, Unknown=1, NotChecked=0, Total=24806 [2023-12-02 12:35:12,790 INFO L413 NwaCegarLoop]: 52 mSDtfsCounter, 474 mSDsluCounter, 972 mSDsCounter, 0 mSdLazyCounter, 1647 mSolverCounterSat, 548 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 28.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 474 SdHoareTripleChecker+Valid, 1024 SdHoareTripleChecker+Invalid, 2195 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 548 IncrementalHoareTripleChecker+Valid, 1647 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 28.3s IncrementalHoareTripleChecker+Time [2023-12-02 12:35:12,790 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [474 Valid, 1024 Invalid, 2195 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [548 Valid, 1647 Invalid, 0 Unknown, 0 Unchecked, 28.3s Time] [2023-12-02 12:35:12,792 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2305 states. [2023-12-02 12:35:19,083 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2305 to 1947. [2023-12-02 12:35:19,086 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1947 states, 1024 states have (on average 1.2841796875) internal successors, (1315), 1030 states have internal predecessors, (1315), 863 states have call successors, (863), 59 states have call predecessors, (863), 59 states have return successors, (862), 857 states have call predecessors, (862), 862 states have call successors, (862) [2023-12-02 12:35:19,091 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1947 states to 1947 states and 3040 transitions. [2023-12-02 12:35:19,092 INFO L78 Accepts]: Start accepts. Automaton has 1947 states and 3040 transitions. Word has length 128 [2023-12-02 12:35:19,092 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 12:35:19,092 INFO L495 AbstractCegarLoop]: Abstraction has 1947 states and 3040 transitions. [2023-12-02 12:35:19,092 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 37 states, 34 states have (on average 2.1176470588235294) internal successors, (72), 34 states have internal predecessors, (72), 11 states have call successors, (38), 3 states have call predecessors, (38), 2 states have return successors, (37), 10 states have call predecessors, (37), 9 states have call successors, (37) [2023-12-02 12:35:19,092 INFO L276 IsEmpty]: Start isEmpty. Operand 1947 states and 3040 transitions. [2023-12-02 12:35:19,095 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 134 [2023-12-02 12:35:19,095 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 12:35:19,095 INFO L195 NwaCegarLoop]: trace histogram [17, 16, 16, 6, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 3, 3, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-12-02 12:35:19,100 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_34ce422d-fb76-4dd4-808c-ba8e1f9cec70/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (22)] Ended with exit code 0 [2023-12-02 12:35:19,296 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable20,22 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_34ce422d-fb76-4dd4-808c-ba8e1f9cec70/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 12:35:19,296 INFO L420 AbstractCegarLoop]: === Iteration 22 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 12:35:19,296 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 12:35:19,296 INFO L85 PathProgramCache]: Analyzing trace with hash -1309664975, now seen corresponding path program 6 times [2023-12-02 12:35:19,296 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 12:35:19,296 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [109841671] [2023-12-02 12:35:19,297 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 12:35:19,297 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 12:35:19,306 ERROR L246 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2023-12-02 12:35:19,306 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1010519939] [2023-12-02 12:35:19,306 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2023-12-02 12:35:19,306 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 12:35:19,306 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_34ce422d-fb76-4dd4-808c-ba8e1f9cec70/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 12:35:19,307 INFO L229 MonitoredProcess]: Starting monitored process 23 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_34ce422d-fb76-4dd4-808c-ba8e1f9cec70/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 12:35:19,308 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_34ce422d-fb76-4dd4-808c-ba8e1f9cec70/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (23)] Waiting until timeout for monitored process [2023-12-02 12:35:19,478 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2023-12-02 12:35:19,478 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-12-02 12:35:19,481 INFO L262 TraceCheckSpWp]: Trace formula consists of 296 conjuncts, 118 conjunts are in the unsatisfiable core [2023-12-02 12:35:19,485 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 12:35:21,601 INFO L134 CoverageAnalysis]: Checked inductivity of 608 backedges. 112 proven. 124 refuted. 0 times theorem prover too weak. 372 trivial. 0 not checked. [2023-12-02 12:35:21,601 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-12-02 12:35:32,013 INFO L134 CoverageAnalysis]: Checked inductivity of 608 backedges. 152 proven. 22 refuted. 0 times theorem prover too weak. 434 trivial. 0 not checked. [2023-12-02 12:35:32,014 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 12:35:32,014 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [109841671] [2023-12-02 12:35:32,014 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2023-12-02 12:35:32,014 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1010519939] [2023-12-02 12:35:32,014 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1010519939] provided 0 perfect and 2 imperfect interpolant sequences [2023-12-02 12:35:32,014 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1886457681] [2023-12-02 12:35:32,016 INFO L159 IcfgInterpreter]: Started Sifa with 28 locations of interest [2023-12-02 12:35:32,016 INFO L166 IcfgInterpreter]: Building call graph [2023-12-02 12:35:32,016 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-12-02 12:35:32,016 INFO L176 IcfgInterpreter]: Starting interpretation [2023-12-02 12:35:32,016 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-12-02 12:35:34,301 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 9 for LOIs [2023-12-02 12:35:34,305 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 3 for LOIs [2023-12-02 12:35:34,305 INFO L180 IcfgInterpreter]: Interpretation finished [2023-12-02 12:35:40,598 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '50727#(and (= |__VERIFIER_assert_#in~cond| 0) (= __VERIFIER_assert_~cond 0))' at error location [2023-12-02 12:35:40,598 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-12-02 12:35:40,598 INFO L185 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2023-12-02 12:35:40,598 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [26, 13] total 36 [2023-12-02 12:35:40,599 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1593308035] [2023-12-02 12:35:40,599 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2023-12-02 12:35:40,599 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 36 states [2023-12-02 12:35:40,599 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 12:35:40,600 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 36 interpolants. [2023-12-02 12:35:40,600 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=276, Invalid=2694, Unknown=0, NotChecked=0, Total=2970 [2023-12-02 12:35:40,600 INFO L87 Difference]: Start difference. First operand 1947 states and 3040 transitions. Second operand has 36 states, 32 states have (on average 2.34375) internal successors, (75), 33 states have internal predecessors, (75), 13 states have call successors, (35), 3 states have call predecessors, (35), 3 states have return successors, (34), 9 states have call predecessors, (34), 11 states have call successors, (34) [2023-12-02 12:36:04,972 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 12:36:20,727 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 12:36:20,727 INFO L93 Difference]: Finished difference Result 2283 states and 3527 transitions. [2023-12-02 12:36:20,727 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 59 states. [2023-12-02 12:36:20,728 INFO L78 Accepts]: Start accepts. Automaton has has 36 states, 32 states have (on average 2.34375) internal successors, (75), 33 states have internal predecessors, (75), 13 states have call successors, (35), 3 states have call predecessors, (35), 3 states have return successors, (34), 9 states have call predecessors, (34), 11 states have call successors, (34) Word has length 133 [2023-12-02 12:36:20,728 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 12:36:20,743 INFO L225 Difference]: With dead ends: 2283 [2023-12-02 12:36:20,743 INFO L226 Difference]: Without dead ends: 2275 [2023-12-02 12:36:20,746 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 458 GetRequests, 359 SyntacticMatches, 1 SemanticMatches, 98 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2898 ImplicationChecksByTransitivity, 26.7s TimeCoverageRelationStatistics Valid=1088, Invalid=8812, Unknown=0, NotChecked=0, Total=9900 [2023-12-02 12:36:20,746 INFO L413 NwaCegarLoop]: 54 mSDtfsCounter, 217 mSDsluCounter, 1039 mSDsCounter, 0 mSdLazyCounter, 1985 mSolverCounterSat, 313 mSolverCounterUnsat, 1 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 14.8s Time, 0 mProtectedPredicate, 0 mProtectedAction, 230 SdHoareTripleChecker+Valid, 1093 SdHoareTripleChecker+Invalid, 2299 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 313 IncrementalHoareTripleChecker+Valid, 1985 IncrementalHoareTripleChecker+Invalid, 1 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 15.1s IncrementalHoareTripleChecker+Time [2023-12-02 12:36:20,747 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [230 Valid, 1093 Invalid, 2299 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [313 Valid, 1985 Invalid, 1 Unknown, 0 Unchecked, 15.1s Time] [2023-12-02 12:36:20,749 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2275 states. [2023-12-02 12:36:27,766 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2275 to 2059. [2023-12-02 12:36:27,769 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2059 states, 1066 states have (on average 1.2898686679174485) internal successors, (1375), 1071 states have internal predecessors, (1375), 925 states have call successors, (925), 67 states have call predecessors, (925), 67 states have return successors, (924), 920 states have call predecessors, (924), 924 states have call successors, (924) [2023-12-02 12:36:27,774 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2059 states to 2059 states and 3224 transitions. [2023-12-02 12:36:27,775 INFO L78 Accepts]: Start accepts. Automaton has 2059 states and 3224 transitions. Word has length 133 [2023-12-02 12:36:27,775 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 12:36:27,775 INFO L495 AbstractCegarLoop]: Abstraction has 2059 states and 3224 transitions. [2023-12-02 12:36:27,775 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 36 states, 32 states have (on average 2.34375) internal successors, (75), 33 states have internal predecessors, (75), 13 states have call successors, (35), 3 states have call predecessors, (35), 3 states have return successors, (34), 9 states have call predecessors, (34), 11 states have call successors, (34) [2023-12-02 12:36:27,775 INFO L276 IsEmpty]: Start isEmpty. Operand 2059 states and 3224 transitions. [2023-12-02 12:36:27,778 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 143 [2023-12-02 12:36:27,779 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 12:36:27,779 INFO L195 NwaCegarLoop]: trace histogram [21, 20, 20, 5, 5, 5, 5, 5, 5, 5, 5, 5, 4, 3, 3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-12-02 12:36:27,783 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_34ce422d-fb76-4dd4-808c-ba8e1f9cec70/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (23)] Forceful destruction successful, exit code 0 [2023-12-02 12:36:27,979 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable21,23 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_34ce422d-fb76-4dd4-808c-ba8e1f9cec70/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 12:36:27,980 INFO L420 AbstractCegarLoop]: === Iteration 23 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 12:36:27,980 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 12:36:27,980 INFO L85 PathProgramCache]: Analyzing trace with hash 932652153, now seen corresponding path program 7 times [2023-12-02 12:36:27,980 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 12:36:27,980 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [262626543] [2023-12-02 12:36:27,980 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 12:36:27,980 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 12:36:27,988 ERROR L246 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2023-12-02 12:36:27,989 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1905924371] [2023-12-02 12:36:27,989 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2023-12-02 12:36:27,989 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 12:36:27,989 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_34ce422d-fb76-4dd4-808c-ba8e1f9cec70/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 12:36:27,990 INFO L229 MonitoredProcess]: Starting monitored process 24 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_34ce422d-fb76-4dd4-808c-ba8e1f9cec70/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 12:36:27,992 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_34ce422d-fb76-4dd4-808c-ba8e1f9cec70/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (24)] Waiting until timeout for monitored process [2023-12-02 12:36:28,059 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 12:36:28,061 INFO L262 TraceCheckSpWp]: Trace formula consists of 323 conjuncts, 6 conjunts are in the unsatisfiable core [2023-12-02 12:36:28,063 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 12:36:28,114 INFO L134 CoverageAnalysis]: Checked inductivity of 881 backedges. 453 proven. 18 refuted. 0 times theorem prover too weak. 410 trivial. 0 not checked. [2023-12-02 12:36:28,114 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-12-02 12:36:28,201 INFO L134 CoverageAnalysis]: Checked inductivity of 881 backedges. 85 proven. 18 refuted. 0 times theorem prover too weak. 778 trivial. 0 not checked. [2023-12-02 12:36:28,201 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 12:36:28,201 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [262626543] [2023-12-02 12:36:28,201 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2023-12-02 12:36:28,201 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1905924371] [2023-12-02 12:36:28,201 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1905924371] provided 0 perfect and 2 imperfect interpolant sequences [2023-12-02 12:36:28,201 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [2029207879] [2023-12-02 12:36:28,203 INFO L159 IcfgInterpreter]: Started Sifa with 28 locations of interest [2023-12-02 12:36:28,203 INFO L166 IcfgInterpreter]: Building call graph [2023-12-02 12:36:28,203 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-12-02 12:36:28,203 INFO L176 IcfgInterpreter]: Starting interpretation [2023-12-02 12:36:28,203 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-12-02 12:36:30,695 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 1 for LOIs [2023-12-02 12:36:30,697 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 3 for LOIs [2023-12-02 12:36:30,698 INFO L180 IcfgInterpreter]: Interpretation finished [2023-12-02 12:36:31,441 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '58890#(and (= |__VERIFIER_assert_#in~cond| 0) (= __VERIFIER_assert_~cond 0))' at error location [2023-12-02 12:36:31,441 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-12-02 12:36:31,441 INFO L185 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2023-12-02 12:36:31,441 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7] total 8 [2023-12-02 12:36:31,441 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2072432033] [2023-12-02 12:36:31,442 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2023-12-02 12:36:31,442 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2023-12-02 12:36:31,442 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 12:36:31,443 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2023-12-02 12:36:31,443 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=75, Invalid=477, Unknown=0, NotChecked=0, Total=552 [2023-12-02 12:36:31,443 INFO L87 Difference]: Start difference. First operand 2059 states and 3224 transitions. Second operand has 8 states, 8 states have (on average 4.5) internal successors, (36), 8 states have internal predecessors, (36), 5 states have call successors, (25), 2 states have call predecessors, (25), 2 states have return successors, (24), 5 states have call predecessors, (24), 5 states have call successors, (24) [2023-12-02 12:36:39,001 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 12:36:39,001 INFO L93 Difference]: Finished difference Result 3348 states and 5255 transitions. [2023-12-02 12:36:39,002 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2023-12-02 12:36:39,002 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 8 states have (on average 4.5) internal successors, (36), 8 states have internal predecessors, (36), 5 states have call successors, (25), 2 states have call predecessors, (25), 2 states have return successors, (24), 5 states have call predecessors, (24), 5 states have call successors, (24) Word has length 142 [2023-12-02 12:36:39,002 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 12:36:39,014 INFO L225 Difference]: With dead ends: 3348 [2023-12-02 12:36:39,014 INFO L226 Difference]: Without dead ends: 2228 [2023-12-02 12:36:39,017 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 426 GetRequests, 396 SyntacticMatches, 6 SemanticMatches, 24 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 149 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=89, Invalid=561, Unknown=0, NotChecked=0, Total=650 [2023-12-02 12:36:39,018 INFO L413 NwaCegarLoop]: 51 mSDtfsCounter, 6 mSDsluCounter, 159 mSDsCounter, 0 mSdLazyCounter, 117 mSolverCounterSat, 18 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 6 SdHoareTripleChecker+Valid, 210 SdHoareTripleChecker+Invalid, 135 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 18 IncrementalHoareTripleChecker+Valid, 117 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-12-02 12:36:39,018 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [6 Valid, 210 Invalid, 135 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [18 Valid, 117 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-12-02 12:36:39,020 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2228 states. [2023-12-02 12:36:46,052 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2228 to 2092. [2023-12-02 12:36:46,056 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2092 states, 1108 states have (on average 1.273465703971119) internal successors, (1411), 1138 states have internal predecessors, (1411), 918 states have call successors, (918), 65 states have call predecessors, (918), 65 states have return successors, (917), 888 states have call predecessors, (917), 917 states have call successors, (917) [2023-12-02 12:36:46,063 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2092 states to 2092 states and 3246 transitions. [2023-12-02 12:36:46,064 INFO L78 Accepts]: Start accepts. Automaton has 2092 states and 3246 transitions. Word has length 142 [2023-12-02 12:36:46,064 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 12:36:46,065 INFO L495 AbstractCegarLoop]: Abstraction has 2092 states and 3246 transitions. [2023-12-02 12:36:46,065 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 8 states, 8 states have (on average 4.5) internal successors, (36), 8 states have internal predecessors, (36), 5 states have call successors, (25), 2 states have call predecessors, (25), 2 states have return successors, (24), 5 states have call predecessors, (24), 5 states have call successors, (24) [2023-12-02 12:36:46,065 INFO L276 IsEmpty]: Start isEmpty. Operand 2092 states and 3246 transitions. [2023-12-02 12:36:46,069 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 143 [2023-12-02 12:36:46,069 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 12:36:46,069 INFO L195 NwaCegarLoop]: trace histogram [21, 20, 20, 5, 5, 5, 5, 5, 5, 5, 5, 5, 4, 3, 3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-12-02 12:36:46,074 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_34ce422d-fb76-4dd4-808c-ba8e1f9cec70/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (24)] Forceful destruction successful, exit code 0 [2023-12-02 12:36:46,269 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable22,24 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_34ce422d-fb76-4dd4-808c-ba8e1f9cec70/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 12:36:46,270 INFO L420 AbstractCegarLoop]: === Iteration 24 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 12:36:46,270 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 12:36:46,270 INFO L85 PathProgramCache]: Analyzing trace with hash -1298153257, now seen corresponding path program 8 times [2023-12-02 12:36:46,270 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 12:36:46,270 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1467124521] [2023-12-02 12:36:46,270 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 12:36:46,271 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 12:36:46,280 ERROR L246 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2023-12-02 12:36:46,280 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [181868439] [2023-12-02 12:36:46,280 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2023-12-02 12:36:46,280 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 12:36:46,280 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_34ce422d-fb76-4dd4-808c-ba8e1f9cec70/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 12:36:46,281 INFO L229 MonitoredProcess]: Starting monitored process 25 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_34ce422d-fb76-4dd4-808c-ba8e1f9cec70/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 12:36:46,282 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_34ce422d-fb76-4dd4-808c-ba8e1f9cec70/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (25)] Waiting until timeout for monitored process [2023-12-02 12:36:46,408 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 5 check-sat command(s) [2023-12-02 12:36:46,408 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-12-02 12:36:46,410 INFO L262 TraceCheckSpWp]: Trace formula consists of 209 conjuncts, 72 conjunts are in the unsatisfiable core [2023-12-02 12:36:46,413 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 12:36:49,194 INFO L134 CoverageAnalysis]: Checked inductivity of 881 backedges. 134 proven. 80 refuted. 0 times theorem prover too weak. 667 trivial. 0 not checked. [2023-12-02 12:36:49,194 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-12-02 12:37:02,566 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 12:37:02,566 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1467124521] [2023-12-02 12:37:02,566 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2023-12-02 12:37:02,566 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [181868439] [2023-12-02 12:37:02,566 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [181868439] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 12:37:02,566 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [415627240] [2023-12-02 12:37:02,567 INFO L159 IcfgInterpreter]: Started Sifa with 28 locations of interest [2023-12-02 12:37:02,567 INFO L166 IcfgInterpreter]: Building call graph [2023-12-02 12:37:02,567 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-12-02 12:37:02,567 INFO L176 IcfgInterpreter]: Starting interpretation [2023-12-02 12:37:02,568 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs