./Ultimate.py --spec ../../sv-benchmarks/c/properties/unreach-call.prp --file ../../sv-benchmarks/c/nla-digbench-scaling/egcd2-ll_unwindbound20.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_e6365f1c-6e1a-454b-8e39-744a0dfb75e7/bin/utaipan-verify-nQ1chXbOIh/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e6365f1c-6e1a-454b-8e39-744a0dfb75e7/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_e6365f1c-6e1a-454b-8e39-744a0dfb75e7/bin/utaipan-verify-nQ1chXbOIh/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e6365f1c-6e1a-454b-8e39-744a0dfb75e7/bin/utaipan-verify-nQ1chXbOIh/config/TaipanReach.xml -i ../../sv-benchmarks/c/nla-digbench-scaling/egcd2-ll_unwindbound20.c -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e6365f1c-6e1a-454b-8e39-744a0dfb75e7/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_e6365f1c-6e1a-454b-8e39-744a0dfb75e7/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 9e9911e775b3214ba13077b05d83e9364947724e9afa3bb89f51b07ee325bd90 --- Real Ultimate output --- This is Ultimate 0.2.4-dev-0e0057c [2023-12-02 12:30:03,587 INFO L188 SettingsManager]: Resetting all preferences to default values... [2023-12-02 12:30:03,651 INFO L114 SettingsManager]: Loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e6365f1c-6e1a-454b-8e39-744a0dfb75e7/bin/utaipan-verify-nQ1chXbOIh/config/svcomp-Reach-32bit-Taipan_Default.epf [2023-12-02 12:30:03,655 WARN L101 SettingsManager]: Preference file contains the following unknown settings: [2023-12-02 12:30:03,656 WARN L103 SettingsManager]: * de.uni_freiburg.informatik.ultimate.core.Log level for class [2023-12-02 12:30:03,681 INFO L130 SettingsManager]: Preferences different from defaults after loading the file: [2023-12-02 12:30:03,682 INFO L151 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2023-12-02 12:30:03,682 INFO L153 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2023-12-02 12:30:03,683 INFO L151 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2023-12-02 12:30:03,683 INFO L153 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2023-12-02 12:30:03,684 INFO L153 SettingsManager]: * User list type=DISABLED [2023-12-02 12:30:03,685 INFO L151 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2023-12-02 12:30:03,685 INFO L153 SettingsManager]: * Explicit value domain=true [2023-12-02 12:30:03,686 INFO L153 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2023-12-02 12:30:03,686 INFO L153 SettingsManager]: * Octagon Domain=false [2023-12-02 12:30:03,687 INFO L153 SettingsManager]: * Abstract domain=CompoundDomain [2023-12-02 12:30:03,687 INFO L153 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2023-12-02 12:30:03,688 INFO L153 SettingsManager]: * Use the RCFG-of-the-future interface=true [2023-12-02 12:30:03,688 INFO L153 SettingsManager]: * Interval Domain=false [2023-12-02 12:30:03,689 INFO L151 SettingsManager]: Preferences of Sifa differ from their defaults: [2023-12-02 12:30:03,690 INFO L153 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2023-12-02 12:30:03,690 INFO L153 SettingsManager]: * Simplification Technique=POLY_PAC [2023-12-02 12:30:03,691 INFO L151 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2023-12-02 12:30:03,692 INFO L153 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2023-12-02 12:30:03,692 INFO L153 SettingsManager]: * sizeof long=4 [2023-12-02 12:30:03,693 INFO L153 SettingsManager]: * Overapproximate operations on floating types=true [2023-12-02 12:30:03,693 INFO L153 SettingsManager]: * sizeof POINTER=4 [2023-12-02 12:30:03,693 INFO L153 SettingsManager]: * Check division by zero=IGNORE [2023-12-02 12:30:03,694 INFO L153 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2023-12-02 12:30:03,694 INFO L153 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2023-12-02 12:30:03,695 INFO L153 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2023-12-02 12:30:03,695 INFO L153 SettingsManager]: * sizeof long double=12 [2023-12-02 12:30:03,695 INFO L153 SettingsManager]: * Check if freed pointer was valid=false [2023-12-02 12:30:03,696 INFO L153 SettingsManager]: * Use constant arrays=true [2023-12-02 12:30:03,696 INFO L151 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2023-12-02 12:30:03,696 INFO L153 SettingsManager]: * Only consider context switches at boundaries of atomic blocks=true [2023-12-02 12:30:03,696 INFO L153 SettingsManager]: * SMT solver=External_DefaultMode [2023-12-02 12:30:03,697 INFO L153 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2023-12-02 12:30:03,697 INFO L151 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2023-12-02 12:30:03,697 INFO L153 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2023-12-02 12:30:03,697 INFO L153 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopHeads [2023-12-02 12:30:03,697 INFO L153 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2023-12-02 12:30:03,698 INFO L153 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2023-12-02 12:30:03,698 INFO L153 SettingsManager]: * Apply one-shot large block encoding in concurrent analysis=false [2023-12-02 12:30:03,698 INFO L153 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2023-12-02 12:30:03,698 INFO L153 SettingsManager]: * Trace refinement exception blacklist=NONE [2023-12-02 12:30:03,698 INFO L153 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2023-12-02 12:30:03,699 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_e6365f1c-6e1a-454b-8e39-744a0dfb75e7/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e6365f1c-6e1a-454b-8e39-744a0dfb75e7/bin/utaipan-verify-nQ1chXbOIh Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> 9e9911e775b3214ba13077b05d83e9364947724e9afa3bb89f51b07ee325bd90 [2023-12-02 12:30:03,931 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2023-12-02 12:30:03,953 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2023-12-02 12:30:03,956 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2023-12-02 12:30:03,957 INFO L270 PluginConnector]: Initializing CDTParser... [2023-12-02 12:30:03,958 INFO L274 PluginConnector]: CDTParser initialized [2023-12-02 12:30:03,959 INFO L431 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e6365f1c-6e1a-454b-8e39-744a0dfb75e7/bin/utaipan-verify-nQ1chXbOIh/../../sv-benchmarks/c/nla-digbench-scaling/egcd2-ll_unwindbound20.c [2023-12-02 12:30:06,733 INFO L533 CDTParser]: Created temporary CDT project at NULL [2023-12-02 12:30:06,914 INFO L384 CDTParser]: Found 1 translation units. [2023-12-02 12:30:06,914 INFO L180 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e6365f1c-6e1a-454b-8e39-744a0dfb75e7/sv-benchmarks/c/nla-digbench-scaling/egcd2-ll_unwindbound20.c [2023-12-02 12:30:06,920 INFO L427 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e6365f1c-6e1a-454b-8e39-744a0dfb75e7/bin/utaipan-verify-nQ1chXbOIh/data/e4b9411c4/148cb47ba8524358adcaa38ea66f5441/FLAGd1030b691 [2023-12-02 12:30:06,932 INFO L435 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e6365f1c-6e1a-454b-8e39-744a0dfb75e7/bin/utaipan-verify-nQ1chXbOIh/data/e4b9411c4/148cb47ba8524358adcaa38ea66f5441 [2023-12-02 12:30:06,934 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2023-12-02 12:30:06,935 INFO L133 ToolchainWalker]: Walking toolchain with 6 elements. [2023-12-02 12:30:06,936 INFO L112 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2023-12-02 12:30:06,936 INFO L270 PluginConnector]: Initializing CACSL2BoogieTranslator... [2023-12-02 12:30:06,942 INFO L274 PluginConnector]: CACSL2BoogieTranslator initialized [2023-12-02 12:30:06,943 INFO L184 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 02.12 12:30:06" (1/1) ... [2023-12-02 12:30:06,944 INFO L204 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@2f12b404 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 12:30:06, skipping insertion in model container [2023-12-02 12:30:06,944 INFO L184 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 02.12 12:30:06" (1/1) ... [2023-12-02 12:30:06,966 INFO L177 MainTranslator]: Built tables and reachable declarations [2023-12-02 12:30:07,128 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_e6365f1c-6e1a-454b-8e39-744a0dfb75e7/sv-benchmarks/c/nla-digbench-scaling/egcd2-ll_unwindbound20.c[490,503] [2023-12-02 12:30:07,153 INFO L209 PostProcessor]: Analyzing one entry point: main [2023-12-02 12:30:07,164 INFO L202 MainTranslator]: Completed pre-run [2023-12-02 12:30:07,179 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_e6365f1c-6e1a-454b-8e39-744a0dfb75e7/sv-benchmarks/c/nla-digbench-scaling/egcd2-ll_unwindbound20.c[490,503] [2023-12-02 12:30:07,190 INFO L209 PostProcessor]: Analyzing one entry point: main [2023-12-02 12:30:07,207 INFO L206 MainTranslator]: Completed translation [2023-12-02 12:30:07,207 INFO L201 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 12:30:07 WrapperNode [2023-12-02 12:30:07,207 INFO L131 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2023-12-02 12:30:07,209 INFO L112 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2023-12-02 12:30:07,209 INFO L270 PluginConnector]: Initializing Boogie Procedure Inliner... [2023-12-02 12:30:07,209 INFO L274 PluginConnector]: Boogie Procedure Inliner initialized [2023-12-02 12:30:07,217 INFO L184 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 12:30:07" (1/1) ... [2023-12-02 12:30:07,225 INFO L184 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 12:30:07" (1/1) ... [2023-12-02 12:30:07,249 INFO L138 Inliner]: procedures = 14, calls = 17, calls flagged for inlining = 2, calls inlined = 2, statements flattened = 86 [2023-12-02 12:30:07,249 INFO L131 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2023-12-02 12:30:07,250 INFO L112 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2023-12-02 12:30:07,250 INFO L270 PluginConnector]: Initializing Boogie Preprocessor... [2023-12-02 12:30:07,250 INFO L274 PluginConnector]: Boogie Preprocessor initialized [2023-12-02 12:30:07,260 INFO L184 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 12:30:07" (1/1) ... [2023-12-02 12:30:07,260 INFO L184 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 12:30:07" (1/1) ... [2023-12-02 12:30:07,262 INFO L184 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 12:30:07" (1/1) ... [2023-12-02 12:30:07,262 INFO L184 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 12:30:07" (1/1) ... [2023-12-02 12:30:07,267 INFO L184 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 12:30:07" (1/1) ... [2023-12-02 12:30:07,271 INFO L184 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 12:30:07" (1/1) ... [2023-12-02 12:30:07,273 INFO L184 PluginConnector]: Executing the observer LTLStepAnnotator from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 12:30:07" (1/1) ... [2023-12-02 12:30:07,274 INFO L184 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 12:30:07" (1/1) ... [2023-12-02 12:30:07,276 INFO L131 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2023-12-02 12:30:07,278 INFO L112 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2023-12-02 12:30:07,278 INFO L270 PluginConnector]: Initializing RCFGBuilder... [2023-12-02 12:30:07,278 INFO L274 PluginConnector]: RCFGBuilder initialized [2023-12-02 12:30:07,279 INFO L184 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 12:30:07" (1/1) ... [2023-12-02 12:30:07,286 INFO L173 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2023-12-02 12:30:07,299 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e6365f1c-6e1a-454b-8e39-744a0dfb75e7/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 12:30:07,315 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e6365f1c-6e1a-454b-8e39-744a0dfb75e7/bin/utaipan-verify-nQ1chXbOIh/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2023-12-02 12:30:07,324 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e6365f1c-6e1a-454b-8e39-744a0dfb75e7/bin/utaipan-verify-nQ1chXbOIh/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2023-12-02 12:30:07,356 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2023-12-02 12:30:07,357 INFO L130 BoogieDeclarations]: Found specification of procedure assume_abort_if_not [2023-12-02 12:30:07,357 INFO L138 BoogieDeclarations]: Found implementation of procedure assume_abort_if_not [2023-12-02 12:30:07,357 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2023-12-02 12:30:07,357 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2023-12-02 12:30:07,357 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2023-12-02 12:30:07,357 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2023-12-02 12:30:07,358 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2023-12-02 12:30:07,438 INFO L241 CfgBuilder]: Building ICFG [2023-12-02 12:30:07,441 INFO L267 CfgBuilder]: Building CFG for each procedure with an implementation [2023-12-02 12:30:07,626 INFO L282 CfgBuilder]: Performing block encoding [2023-12-02 12:30:07,653 INFO L304 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2023-12-02 12:30:07,654 INFO L309 CfgBuilder]: Removed 2 assume(true) statements. [2023-12-02 12:30:07,655 INFO L201 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 02.12 12:30:07 BoogieIcfgContainer [2023-12-02 12:30:07,655 INFO L131 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2023-12-02 12:30:07,658 INFO L112 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2023-12-02 12:30:07,658 INFO L270 PluginConnector]: Initializing TraceAbstraction... [2023-12-02 12:30:07,662 INFO L274 PluginConnector]: TraceAbstraction initialized [2023-12-02 12:30:07,662 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 02.12 12:30:06" (1/3) ... [2023-12-02 12:30:07,663 INFO L204 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@39f4acbc and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 02.12 12:30:07, skipping insertion in model container [2023-12-02 12:30:07,663 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 12:30:07" (2/3) ... [2023-12-02 12:30:07,664 INFO L204 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@39f4acbc and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 02.12 12:30:07, skipping insertion in model container [2023-12-02 12:30:07,664 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 02.12 12:30:07" (3/3) ... [2023-12-02 12:30:07,665 INFO L112 eAbstractionObserver]: Analyzing ICFG egcd2-ll_unwindbound20.c [2023-12-02 12:30:07,684 INFO L203 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2023-12-02 12:30:07,684 INFO L162 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2023-12-02 12:30:07,728 INFO L356 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2023-12-02 12:30:07,735 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;@1494a304, mLbeIndependenceSettings=[IndependenceType=SEMANTIC, AbstractionType=NONE, UseConditional=false, UseSemiCommutativity=true, Solver=Z3, SolverTimeout=1000ms] [2023-12-02 12:30:07,735 INFO L358 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2023-12-02 12:30:07,739 INFO L276 IsEmpty]: Start isEmpty. Operand has 29 states, 15 states have (on average 1.5333333333333334) internal successors, (23), 17 states have internal predecessors, (23), 10 states have call successors, (10), 2 states have call predecessors, (10), 2 states have return successors, (10), 10 states have call predecessors, (10), 10 states have call successors, (10) [2023-12-02 12:30:07,746 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2023-12-02 12:30:07,746 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 12:30:07,747 INFO L195 NwaCegarLoop]: trace histogram [4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-12-02 12:30:07,747 INFO L420 AbstractCegarLoop]: === Iteration 1 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 12:30:07,753 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 12:30:07,753 INFO L85 PathProgramCache]: Analyzing trace with hash 1288775727, now seen corresponding path program 1 times [2023-12-02 12:30:07,762 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 12:30:07,762 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [657498659] [2023-12-02 12:30:07,762 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 12:30:07,763 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 12:30:07,856 ERROR L246 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2023-12-02 12:30:07,857 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1254642038] [2023-12-02 12:30:07,857 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 12:30:07,857 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 12:30:07,858 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e6365f1c-6e1a-454b-8e39-744a0dfb75e7/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 12:30:07,872 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e6365f1c-6e1a-454b-8e39-744a0dfb75e7/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 12:30:07,874 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e6365f1c-6e1a-454b-8e39-744a0dfb75e7/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2023-12-02 12:30:07,970 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 12:30:07,973 INFO L262 TraceCheckSpWp]: Trace formula consists of 89 conjuncts, 1 conjunts are in the unsatisfiable core [2023-12-02 12:30:07,979 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 12:30:08,030 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 12:30:08,031 INFO L323 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2023-12-02 12:30:08,031 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 12:30:08,031 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [657498659] [2023-12-02 12:30:08,031 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2023-12-02 12:30:08,032 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1254642038] [2023-12-02 12:30:08,033 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1254642038] provided 1 perfect and 0 imperfect interpolant sequences [2023-12-02 12:30:08,033 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-12-02 12:30:08,033 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2023-12-02 12:30:08,036 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1544441742] [2023-12-02 12:30:08,037 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-12-02 12:30:08,041 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 2 states [2023-12-02 12:30:08,042 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 12:30:08,076 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 2 interpolants. [2023-12-02 12:30:08,076 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2023-12-02 12:30:08,079 INFO L87 Difference]: Start difference. First operand has 29 states, 15 states have (on average 1.5333333333333334) internal successors, (23), 17 states have internal predecessors, (23), 10 states have call successors, (10), 2 states have call predecessors, (10), 2 states have return successors, (10), 10 states have call predecessors, (10), 10 states have call successors, (10) Second operand has 2 states, 2 states have (on average 3.5) internal successors, (7), 2 states have internal predecessors, (7), 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 12:30:08,113 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 12:30:08,113 INFO L93 Difference]: Finished difference Result 50 states and 81 transitions. [2023-12-02 12:30:08,114 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2023-12-02 12:30:08,116 INFO L78 Accepts]: Start accepts. Automaton has has 2 states, 2 states have (on average 3.5) internal successors, (7), 2 states have internal predecessors, (7), 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 19 [2023-12-02 12:30:08,117 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 12:30:08,125 INFO L225 Difference]: With dead ends: 50 [2023-12-02 12:30:08,125 INFO L226 Difference]: Without dead ends: 27 [2023-12-02 12:30:08,129 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 18 GetRequests, 18 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 12:30:08,134 INFO L413 NwaCegarLoop]: 37 mSDtfsCounter, 0 mSDsluCounter, 0 mSDsCounter, 0 mSdLazyCounter, 3 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 37 SdHoareTripleChecker+Invalid, 3 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 3 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2023-12-02 12:30:08,135 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [0 Valid, 37 Invalid, 3 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 3 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2023-12-02 12:30:08,154 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 27 states. [2023-12-02 12:30:08,173 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 27 to 27. [2023-12-02 12:30:08,175 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 27 states, 14 states have (on average 1.3571428571428572) internal successors, (19), 16 states have internal predecessors, (19), 10 states have call successors, (10), 2 states have call predecessors, (10), 2 states have return successors, (9), 9 states have call predecessors, (9), 9 states have call successors, (9) [2023-12-02 12:30:08,177 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 27 states to 27 states and 38 transitions. [2023-12-02 12:30:08,178 INFO L78 Accepts]: Start accepts. Automaton has 27 states and 38 transitions. Word has length 19 [2023-12-02 12:30:08,180 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 12:30:08,180 INFO L495 AbstractCegarLoop]: Abstraction has 27 states and 38 transitions. [2023-12-02 12:30:08,180 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 2 states, 2 states have (on average 3.5) internal successors, (7), 2 states have internal predecessors, (7), 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 12:30:08,180 INFO L276 IsEmpty]: Start isEmpty. Operand 27 states and 38 transitions. [2023-12-02 12:30:08,182 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2023-12-02 12:30:08,182 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 12:30:08,182 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 12:30:08,192 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e6365f1c-6e1a-454b-8e39-744a0dfb75e7/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0 [2023-12-02 12:30:08,384 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0,2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e6365f1c-6e1a-454b-8e39-744a0dfb75e7/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 12:30:08,385 INFO L420 AbstractCegarLoop]: === Iteration 2 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 12:30:08,385 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 12:30:08,386 INFO L85 PathProgramCache]: Analyzing trace with hash 226858993, now seen corresponding path program 1 times [2023-12-02 12:30:08,386 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 12:30:08,386 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1970387572] [2023-12-02 12:30:08,386 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 12:30:08,387 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 12:30:08,405 ERROR L246 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2023-12-02 12:30:08,405 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [885519323] [2023-12-02 12:30:08,406 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 12:30:08,406 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 12:30:08,406 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e6365f1c-6e1a-454b-8e39-744a0dfb75e7/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 12:30:08,408 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e6365f1c-6e1a-454b-8e39-744a0dfb75e7/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 12:30:08,411 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e6365f1c-6e1a-454b-8e39-744a0dfb75e7/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2023-12-02 12:30:08,476 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 12:30:08,477 INFO L262 TraceCheckSpWp]: Trace formula consists of 93 conjuncts, 3 conjunts are in the unsatisfiable core [2023-12-02 12:30:08,479 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 12:30:08,555 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 12:30:08,555 INFO L323 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2023-12-02 12:30:08,556 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 12:30:08,556 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1970387572] [2023-12-02 12:30:08,556 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2023-12-02 12:30:08,557 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [885519323] [2023-12-02 12:30:08,557 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [885519323] provided 1 perfect and 0 imperfect interpolant sequences [2023-12-02 12:30:08,557 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-12-02 12:30:08,558 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2023-12-02 12:30:08,558 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [936162531] [2023-12-02 12:30:08,558 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-12-02 12:30:08,559 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2023-12-02 12:30:08,559 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 12:30:08,560 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2023-12-02 12:30:08,560 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2023-12-02 12:30:08,560 INFO L87 Difference]: Start difference. First operand 27 states and 38 transitions. Second operand has 4 states, 4 states have (on average 2.0) internal successors, (8), 3 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 12:30:08,587 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 12:30:08,587 INFO L93 Difference]: Finished difference Result 37 states and 49 transitions. [2023-12-02 12:30:08,588 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2023-12-02 12:30:08,588 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 2.0) internal successors, (8), 3 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 12:30:08,589 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 12:30:08,589 INFO L225 Difference]: With dead ends: 37 [2023-12-02 12:30:08,590 INFO L226 Difference]: Without dead ends: 29 [2023-12-02 12:30:08,590 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 19 GetRequests, 17 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2023-12-02 12:30:08,592 INFO L413 NwaCegarLoop]: 34 mSDtfsCounter, 0 mSDsluCounter, 57 mSDsCounter, 0 mSdLazyCounter, 12 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 91 SdHoareTripleChecker+Invalid, 12 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 12 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2023-12-02 12:30:08,593 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [0 Valid, 91 Invalid, 12 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 12 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2023-12-02 12:30:08,594 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 29 states. [2023-12-02 12:30:08,600 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 29 to 29. [2023-12-02 12:30:08,601 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 29 states, 16 states have (on average 1.3125) internal successors, (21), 17 states have internal predecessors, (21), 10 states have call successors, (10), 2 states have call predecessors, (10), 2 states have return successors, (9), 9 states have call predecessors, (9), 9 states have call successors, (9) [2023-12-02 12:30:08,602 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 29 states to 29 states and 40 transitions. [2023-12-02 12:30:08,602 INFO L78 Accepts]: Start accepts. Automaton has 29 states and 40 transitions. Word has length 20 [2023-12-02 12:30:08,603 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 12:30:08,603 INFO L495 AbstractCegarLoop]: Abstraction has 29 states and 40 transitions. [2023-12-02 12:30:08,603 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 2.0) internal successors, (8), 3 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 12:30:08,603 INFO L276 IsEmpty]: Start isEmpty. Operand 29 states and 40 transitions. [2023-12-02 12:30:08,604 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2023-12-02 12:30:08,604 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 12:30:08,605 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 12:30:08,610 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e6365f1c-6e1a-454b-8e39-744a0dfb75e7/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Forceful destruction successful, exit code 0 [2023-12-02 12:30:08,808 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1,3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e6365f1c-6e1a-454b-8e39-744a0dfb75e7/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 12:30:08,808 INFO L420 AbstractCegarLoop]: === Iteration 3 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 12:30:08,809 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 12:30:08,809 INFO L85 PathProgramCache]: Analyzing trace with hash -1563892497, now seen corresponding path program 1 times [2023-12-02 12:30:08,809 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 12:30:08,809 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [847401894] [2023-12-02 12:30:08,810 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 12:30:08,810 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 12:30:08,827 ERROR L246 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2023-12-02 12:30:08,828 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1329410736] [2023-12-02 12:30:08,828 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 12:30:08,828 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 12:30:08,828 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e6365f1c-6e1a-454b-8e39-744a0dfb75e7/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 12:30:08,830 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e6365f1c-6e1a-454b-8e39-744a0dfb75e7/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 12:30:08,840 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e6365f1c-6e1a-454b-8e39-744a0dfb75e7/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2023-12-02 12:30:08,890 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 12:30:08,891 INFO L262 TraceCheckSpWp]: Trace formula consists of 95 conjuncts, 7 conjunts are in the unsatisfiable core [2023-12-02 12:30:08,893 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 12:30:08,936 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 1 proven. 2 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2023-12-02 12:30:08,936 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-12-02 12:30:09,009 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 1 proven. 2 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2023-12-02 12:30:09,009 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 12:30:09,009 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [847401894] [2023-12-02 12:30:09,010 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2023-12-02 12:30:09,010 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1329410736] [2023-12-02 12:30:09,010 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1329410736] provided 0 perfect and 2 imperfect interpolant sequences [2023-12-02 12:30:09,010 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1198838088] [2023-12-02 12:30:09,029 INFO L159 IcfgInterpreter]: Started Sifa with 16 locations of interest [2023-12-02 12:30:09,029 INFO L166 IcfgInterpreter]: Building call graph [2023-12-02 12:30:09,033 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-12-02 12:30:09,037 INFO L176 IcfgInterpreter]: Starting interpretation [2023-12-02 12:30:09,038 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-12-02 12:30:09,980 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 7 for LOIs [2023-12-02 12:30:09,981 INFO L180 IcfgInterpreter]: Interpretation finished [2023-12-02 12:30:11,142 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSifa [1198838088] provided 1 perfect and 0 imperfect interpolant sequences [2023-12-02 12:30:11,142 INFO L185 FreeRefinementEngine]: Found 1 perfect and 2 imperfect interpolant sequences. [2023-12-02 12:30:11,142 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [11] imperfect sequences [5, 5] total 15 [2023-12-02 12:30:11,143 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [262693749] [2023-12-02 12:30:11,143 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-12-02 12:30:11,144 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 12 states [2023-12-02 12:30:11,144 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 12:30:11,145 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2023-12-02 12:30:11,145 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=62, Invalid=148, Unknown=0, NotChecked=0, Total=210 [2023-12-02 12:30:11,145 INFO L87 Difference]: Start difference. First operand 29 states and 40 transitions. Second operand has 12 states, 7 states have (on average 1.2857142857142858) internal successors, (9), 6 states have internal predecessors, (9), 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 12:30:11,312 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 12:30:11,312 INFO L93 Difference]: Finished difference Result 38 states and 50 transitions. [2023-12-02 12:30:11,313 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2023-12-02 12:30:11,313 INFO L78 Accepts]: Start accepts. Automaton has has 12 states, 7 states have (on average 1.2857142857142858) internal successors, (9), 6 states have internal predecessors, (9), 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 21 [2023-12-02 12:30:11,313 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 12:30:11,314 INFO L225 Difference]: With dead ends: 38 [2023-12-02 12:30:11,314 INFO L226 Difference]: Without dead ends: 30 [2023-12-02 12:30:11,315 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 61 GetRequests, 46 SyntacticMatches, 2 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 30 ImplicationChecksByTransitivity, 1.2s TimeCoverageRelationStatistics Valid=62, Invalid=148, Unknown=0, NotChecked=0, Total=210 [2023-12-02 12:30:11,316 INFO L413 NwaCegarLoop]: 28 mSDtfsCounter, 0 mSDsluCounter, 80 mSDsCounter, 0 mSdLazyCounter, 90 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 108 SdHoareTripleChecker+Invalid, 90 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 90 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-12-02 12:30:11,317 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [0 Valid, 108 Invalid, 90 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 90 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-12-02 12:30:11,318 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 30 states. [2023-12-02 12:30:11,326 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 30 to 30. [2023-12-02 12:30:11,327 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 30 states, 17 states have (on average 1.2941176470588236) internal successors, (22), 18 states have internal predecessors, (22), 10 states have call successors, (10), 2 states have call predecessors, (10), 2 states have return successors, (9), 9 states have call predecessors, (9), 9 states have call successors, (9) [2023-12-02 12:30:11,328 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 30 states to 30 states and 41 transitions. [2023-12-02 12:30:11,328 INFO L78 Accepts]: Start accepts. Automaton has 30 states and 41 transitions. Word has length 21 [2023-12-02 12:30:11,328 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 12:30:11,329 INFO L495 AbstractCegarLoop]: Abstraction has 30 states and 41 transitions. [2023-12-02 12:30:11,329 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 12 states, 7 states have (on average 1.2857142857142858) internal successors, (9), 6 states have internal predecessors, (9), 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 12:30:11,329 INFO L276 IsEmpty]: Start isEmpty. Operand 30 states and 41 transitions. [2023-12-02 12:30:11,330 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 24 [2023-12-02 12:30:11,330 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 12:30:11,330 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] [2023-12-02 12:30:11,336 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e6365f1c-6e1a-454b-8e39-744a0dfb75e7/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Forceful destruction successful, exit code 0 [2023-12-02 12:30:11,530 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2,4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e6365f1c-6e1a-454b-8e39-744a0dfb75e7/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 12:30:11,531 INFO L420 AbstractCegarLoop]: === Iteration 4 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 12:30:11,531 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 12:30:11,531 INFO L85 PathProgramCache]: Analyzing trace with hash 281079646, now seen corresponding path program 1 times [2023-12-02 12:30:11,531 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 12:30:11,532 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [252819079] [2023-12-02 12:30:11,532 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 12:30:11,532 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 12:30:11,543 ERROR L246 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2023-12-02 12:30:11,544 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1656936384] [2023-12-02 12:30:11,544 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 12:30:11,544 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 12:30:11,544 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e6365f1c-6e1a-454b-8e39-744a0dfb75e7/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 12:30:11,545 INFO L229 MonitoredProcess]: Starting monitored process 5 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e6365f1c-6e1a-454b-8e39-744a0dfb75e7/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 12:30:11,546 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e6365f1c-6e1a-454b-8e39-744a0dfb75e7/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2023-12-02 12:30:11,600 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 12:30:11,601 INFO L262 TraceCheckSpWp]: Trace formula consists of 103 conjuncts, 17 conjunts are in the unsatisfiable core [2023-12-02 12:30:11,603 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 12:30:11,679 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 1 proven. 2 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2023-12-02 12:30:11,679 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-12-02 12:30:11,749 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 12:30:11,749 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 12:30:11,749 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [252819079] [2023-12-02 12:30:11,749 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2023-12-02 12:30:11,750 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1656936384] [2023-12-02 12:30:11,750 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1656936384] provided 1 perfect and 1 imperfect interpolant sequences [2023-12-02 12:30:11,750 INFO L185 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2023-12-02 12:30:11,750 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [8] total 11 [2023-12-02 12:30:11,750 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [146687189] [2023-12-02 12:30:11,750 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-12-02 12:30:11,751 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2023-12-02 12:30:11,751 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 12:30:11,752 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2023-12-02 12:30:11,752 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=23, Invalid=87, Unknown=0, NotChecked=0, Total=110 [2023-12-02 12:30:11,752 INFO L87 Difference]: Start difference. First operand 30 states and 41 transitions. Second operand has 5 states, 5 states have (on average 2.2) internal successors, (11), 4 states have internal predecessors, (11), 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 12:30:11,842 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 12:30:11,843 INFO L93 Difference]: Finished difference Result 36 states and 46 transitions. [2023-12-02 12:30:11,843 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2023-12-02 12:30:11,844 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 2.2) internal successors, (11), 4 states have internal predecessors, (11), 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 23 [2023-12-02 12:30:11,844 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 12:30:11,845 INFO L225 Difference]: With dead ends: 36 [2023-12-02 12:30:11,845 INFO L226 Difference]: Without dead ends: 34 [2023-12-02 12:30:11,845 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 45 GetRequests, 35 SyntacticMatches, 0 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 9 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=27, Invalid=105, Unknown=0, NotChecked=0, Total=132 [2023-12-02 12:30:11,846 INFO L413 NwaCegarLoop]: 30 mSDtfsCounter, 8 mSDsluCounter, 74 mSDsCounter, 0 mSdLazyCounter, 35 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 12 SdHoareTripleChecker+Valid, 104 SdHoareTripleChecker+Invalid, 37 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 35 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-12-02 12:30:11,847 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [12 Valid, 104 Invalid, 37 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 35 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-12-02 12:30:11,848 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 34 states. [2023-12-02 12:30:11,857 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 34 to 34. [2023-12-02 12:30:11,858 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 34 states, 20 states have (on average 1.25) internal successors, (25), 21 states have internal predecessors, (25), 10 states have call successors, (10), 3 states have call predecessors, (10), 3 states have return successors, (9), 9 states have call predecessors, (9), 9 states have call successors, (9) [2023-12-02 12:30:11,859 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 34 states to 34 states and 44 transitions. [2023-12-02 12:30:11,859 INFO L78 Accepts]: Start accepts. Automaton has 34 states and 44 transitions. Word has length 23 [2023-12-02 12:30:11,859 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 12:30:11,860 INFO L495 AbstractCegarLoop]: Abstraction has 34 states and 44 transitions. [2023-12-02 12:30:11,860 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 2.2) internal successors, (11), 4 states have internal predecessors, (11), 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 12:30:11,860 INFO L276 IsEmpty]: Start isEmpty. Operand 34 states and 44 transitions. [2023-12-02 12:30:11,861 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2023-12-02 12:30:11,861 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 12:30:11,861 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 12:30:11,867 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e6365f1c-6e1a-454b-8e39-744a0dfb75e7/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Forceful destruction successful, exit code 0 [2023-12-02 12:30:12,064 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3,5 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e6365f1c-6e1a-454b-8e39-744a0dfb75e7/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 12:30:12,064 INFO L420 AbstractCegarLoop]: === Iteration 5 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 12:30:12,065 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 12:30:12,065 INFO L85 PathProgramCache]: Analyzing trace with hash -717512630, now seen corresponding path program 1 times [2023-12-02 12:30:12,065 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 12:30:12,065 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1574095791] [2023-12-02 12:30:12,066 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 12:30:12,066 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 12:30:12,078 ERROR L246 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2023-12-02 12:30:12,078 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1587384891] [2023-12-02 12:30:12,079 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 12:30:12,079 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 12:30:12,079 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e6365f1c-6e1a-454b-8e39-744a0dfb75e7/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 12:30:12,080 INFO L229 MonitoredProcess]: Starting monitored process 6 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e6365f1c-6e1a-454b-8e39-744a0dfb75e7/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 12:30:12,081 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e6365f1c-6e1a-454b-8e39-744a0dfb75e7/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2023-12-02 12:30:12,133 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 12:30:12,134 INFO L262 TraceCheckSpWp]: Trace formula consists of 120 conjuncts, 5 conjunts are in the unsatisfiable core [2023-12-02 12:30:12,136 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 12:30:12,176 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 12:30:12,176 INFO L323 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2023-12-02 12:30:12,177 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 12:30:12,177 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1574095791] [2023-12-02 12:30:12,177 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2023-12-02 12:30:12,177 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1587384891] [2023-12-02 12:30:12,177 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1587384891] provided 1 perfect and 0 imperfect interpolant sequences [2023-12-02 12:30:12,177 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-12-02 12:30:12,178 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2023-12-02 12:30:12,178 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1615325277] [2023-12-02 12:30:12,178 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-12-02 12:30:12,178 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2023-12-02 12:30:12,178 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 12:30:12,179 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2023-12-02 12:30:12,179 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2023-12-02 12:30:12,179 INFO L87 Difference]: Start difference. First operand 34 states and 44 transitions. Second operand has 5 states, 5 states have (on average 2.8) internal successors, (14), 4 states have internal predecessors, (14), 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 12:30:12,210 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 12:30:12,210 INFO L93 Difference]: Finished difference Result 59 states and 77 transitions. [2023-12-02 12:30:12,211 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2023-12-02 12:30:12,212 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 2.8) internal successors, (14), 4 states have internal predecessors, (14), 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 26 [2023-12-02 12:30:12,212 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 12:30:12,213 INFO L225 Difference]: With dead ends: 59 [2023-12-02 12:30:12,213 INFO L226 Difference]: Without dead ends: 36 [2023-12-02 12:30:12,214 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 25 GetRequests, 22 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 12:30:12,215 INFO L413 NwaCegarLoop]: 33 mSDtfsCounter, 0 mSDsluCounter, 80 mSDsCounter, 0 mSdLazyCounter, 17 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 113 SdHoareTripleChecker+Invalid, 17 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 17 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2023-12-02 12:30:12,215 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [0 Valid, 113 Invalid, 17 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 17 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2023-12-02 12:30:12,216 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 36 states. [2023-12-02 12:30:12,226 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 36 to 36. [2023-12-02 12:30:12,227 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 36 states, 22 states have (on average 1.2272727272727273) internal successors, (27), 23 states have internal predecessors, (27), 10 states have call successors, (10), 3 states have call predecessors, (10), 3 states have return successors, (9), 9 states have call predecessors, (9), 9 states have call successors, (9) [2023-12-02 12:30:12,228 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 36 states to 36 states and 46 transitions. [2023-12-02 12:30:12,228 INFO L78 Accepts]: Start accepts. Automaton has 36 states and 46 transitions. Word has length 26 [2023-12-02 12:30:12,228 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 12:30:12,229 INFO L495 AbstractCegarLoop]: Abstraction has 36 states and 46 transitions. [2023-12-02 12:30:12,229 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 2.8) internal successors, (14), 4 states have internal predecessors, (14), 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 12:30:12,229 INFO L276 IsEmpty]: Start isEmpty. Operand 36 states and 46 transitions. [2023-12-02 12:30:12,230 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 29 [2023-12-02 12:30:12,230 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 12:30:12,230 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] [2023-12-02 12:30:12,236 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e6365f1c-6e1a-454b-8e39-744a0dfb75e7/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Ended with exit code 0 [2023-12-02 12:30:12,430 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,6 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e6365f1c-6e1a-454b-8e39-744a0dfb75e7/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 12:30:12,431 INFO L420 AbstractCegarLoop]: === Iteration 6 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 12:30:12,431 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 12:30:12,431 INFO L85 PathProgramCache]: Analyzing trace with hash -207347326, now seen corresponding path program 1 times [2023-12-02 12:30:12,431 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 12:30:12,431 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1553598358] [2023-12-02 12:30:12,432 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 12:30:12,432 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 12:30:12,442 ERROR L246 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2023-12-02 12:30:12,442 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1206219691] [2023-12-02 12:30:12,443 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 12:30:12,443 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 12:30:12,443 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e6365f1c-6e1a-454b-8e39-744a0dfb75e7/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 12:30:12,444 INFO L229 MonitoredProcess]: Starting monitored process 7 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e6365f1c-6e1a-454b-8e39-744a0dfb75e7/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 12:30:12,446 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e6365f1c-6e1a-454b-8e39-744a0dfb75e7/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Waiting until timeout for monitored process [2023-12-02 12:30:12,491 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 12:30:12,493 INFO L262 TraceCheckSpWp]: Trace formula consists of 112 conjuncts, 23 conjunts are in the unsatisfiable core [2023-12-02 12:30:12,495 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 12:30:12,662 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 12:30:12,663 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-12-02 12:30:12,750 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 12:30:12,750 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 12:30:12,750 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1553598358] [2023-12-02 12:30:12,750 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2023-12-02 12:30:12,751 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1206219691] [2023-12-02 12:30:12,751 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1206219691] provided 1 perfect and 1 imperfect interpolant sequences [2023-12-02 12:30:12,751 INFO L185 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2023-12-02 12:30:12,751 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [10] total 12 [2023-12-02 12:30:12,751 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1440008089] [2023-12-02 12:30:12,751 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-12-02 12:30:12,752 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2023-12-02 12:30:12,752 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 12:30:12,752 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2023-12-02 12:30:12,753 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=27, Invalid=105, Unknown=0, NotChecked=0, Total=132 [2023-12-02 12:30:12,753 INFO L87 Difference]: Start difference. First operand 36 states and 46 transitions. Second operand has 5 states, 5 states have (on average 2.8) internal successors, (14), 4 states have internal predecessors, (14), 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 12:30:12,831 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 12:30:12,831 INFO L93 Difference]: Finished difference Result 50 states and 65 transitions. [2023-12-02 12:30:12,832 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2023-12-02 12:30:12,832 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 2.8) internal successors, (14), 4 states have internal predecessors, (14), 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 28 [2023-12-02 12:30:12,833 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 12:30:12,833 INFO L225 Difference]: With dead ends: 50 [2023-12-02 12:30:12,833 INFO L226 Difference]: Without dead ends: 48 [2023-12-02 12:30:12,834 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 55 GetRequests, 44 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 12:30:12,835 INFO L413 NwaCegarLoop]: 34 mSDtfsCounter, 7 mSDsluCounter, 87 mSDsCounter, 0 mSdLazyCounter, 32 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 10 SdHoareTripleChecker+Valid, 121 SdHoareTripleChecker+Invalid, 33 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 32 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2023-12-02 12:30:12,835 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [10 Valid, 121 Invalid, 33 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 32 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2023-12-02 12:30:12,836 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 48 states. [2023-12-02 12:30:12,848 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 48 to 47. [2023-12-02 12:30:12,848 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 47 states, 28 states have (on average 1.25) internal successors, (35), 29 states have internal predecessors, (35), 14 states have call successors, (14), 4 states have call predecessors, (14), 4 states have return successors, (13), 13 states have call predecessors, (13), 13 states have call successors, (13) [2023-12-02 12:30:12,849 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 47 states to 47 states and 62 transitions. [2023-12-02 12:30:12,849 INFO L78 Accepts]: Start accepts. Automaton has 47 states and 62 transitions. Word has length 28 [2023-12-02 12:30:12,850 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 12:30:12,850 INFO L495 AbstractCegarLoop]: Abstraction has 47 states and 62 transitions. [2023-12-02 12:30:12,850 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 2.8) internal successors, (14), 4 states have internal predecessors, (14), 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 12:30:12,850 INFO L276 IsEmpty]: Start isEmpty. Operand 47 states and 62 transitions. [2023-12-02 12:30:12,851 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 34 [2023-12-02 12:30:12,851 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 12:30:12,851 INFO L195 NwaCegarLoop]: trace histogram [4, 3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-12-02 12:30:12,858 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e6365f1c-6e1a-454b-8e39-744a0dfb75e7/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Ended with exit code 0 [2023-12-02 12:30:13,057 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5,7 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e6365f1c-6e1a-454b-8e39-744a0dfb75e7/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 12:30:13,057 INFO L420 AbstractCegarLoop]: === Iteration 7 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 12:30:13,058 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 12:30:13,058 INFO L85 PathProgramCache]: Analyzing trace with hash -159662690, now seen corresponding path program 1 times [2023-12-02 12:30:13,058 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 12:30:13,058 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [227167875] [2023-12-02 12:30:13,058 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 12:30:13,058 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 12:30:13,069 ERROR L246 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2023-12-02 12:30:13,069 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1750609462] [2023-12-02 12:30:13,069 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 12:30:13,069 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 12:30:13,070 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e6365f1c-6e1a-454b-8e39-744a0dfb75e7/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 12:30:13,070 INFO L229 MonitoredProcess]: Starting monitored process 8 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e6365f1c-6e1a-454b-8e39-744a0dfb75e7/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 12:30:13,071 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e6365f1c-6e1a-454b-8e39-744a0dfb75e7/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Waiting until timeout for monitored process [2023-12-02 12:30:13,125 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 12:30:13,126 INFO L262 TraceCheckSpWp]: Trace formula consists of 121 conjuncts, 23 conjunts are in the unsatisfiable core [2023-12-02 12:30:13,129 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 12:30:13,305 INFO L134 CoverageAnalysis]: Checked inductivity of 20 backedges. 6 proven. 4 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2023-12-02 12:30:13,305 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-12-02 12:30:13,461 INFO L134 CoverageAnalysis]: Checked inductivity of 20 backedges. 4 proven. 0 refuted. 0 times theorem prover too weak. 16 trivial. 0 not checked. [2023-12-02 12:30:13,461 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 12:30:13,461 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [227167875] [2023-12-02 12:30:13,461 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2023-12-02 12:30:13,461 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1750609462] [2023-12-02 12:30:13,462 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1750609462] provided 1 perfect and 1 imperfect interpolant sequences [2023-12-02 12:30:13,462 INFO L185 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2023-12-02 12:30:13,462 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [10] total 12 [2023-12-02 12:30:13,462 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [820960008] [2023-12-02 12:30:13,462 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-12-02 12:30:13,462 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2023-12-02 12:30:13,463 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 12:30:13,463 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2023-12-02 12:30:13,463 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=27, Invalid=105, Unknown=0, NotChecked=0, Total=132 [2023-12-02 12:30:13,463 INFO L87 Difference]: Start difference. First operand 47 states and 62 transitions. Second operand has 5 states, 5 states have (on average 2.8) internal successors, (14), 4 states have internal predecessors, (14), 2 states have call successors, (7), 2 states have call predecessors, (7), 1 states have return successors, (6), 2 states have call predecessors, (6), 2 states have call successors, (6) [2023-12-02 12:30:13,530 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 12:30:13,531 INFO L93 Difference]: Finished difference Result 54 states and 68 transitions. [2023-12-02 12:30:13,531 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2023-12-02 12:30:13,531 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 2.8) internal successors, (14), 4 states have internal predecessors, (14), 2 states have call successors, (7), 2 states have call predecessors, (7), 1 states have return successors, (6), 2 states have call predecessors, (6), 2 states have call successors, (6) Word has length 33 [2023-12-02 12:30:13,532 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 12:30:13,532 INFO L225 Difference]: With dead ends: 54 [2023-12-02 12:30:13,532 INFO L226 Difference]: Without dead ends: 52 [2023-12-02 12:30:13,533 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 65 GetRequests, 54 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 12:30:13,534 INFO L413 NwaCegarLoop]: 32 mSDtfsCounter, 7 mSDsluCounter, 80 mSDsCounter, 0 mSdLazyCounter, 41 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 9 SdHoareTripleChecker+Valid, 112 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 12:30:13,534 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [9 Valid, 112 Invalid, 42 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 41 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2023-12-02 12:30:13,535 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 52 states. [2023-12-02 12:30:13,547 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 52 to 51. [2023-12-02 12:30:13,548 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 51 states, 31 states have (on average 1.2258064516129032) internal successors, (38), 32 states have internal predecessors, (38), 14 states have call successors, (14), 5 states have call predecessors, (14), 5 states have return successors, (13), 13 states have call predecessors, (13), 13 states have call successors, (13) [2023-12-02 12:30:13,548 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 51 states to 51 states and 65 transitions. [2023-12-02 12:30:13,549 INFO L78 Accepts]: Start accepts. Automaton has 51 states and 65 transitions. Word has length 33 [2023-12-02 12:30:13,549 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 12:30:13,549 INFO L495 AbstractCegarLoop]: Abstraction has 51 states and 65 transitions. [2023-12-02 12:30:13,549 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 2.8) internal successors, (14), 4 states have internal predecessors, (14), 2 states have call successors, (7), 2 states have call predecessors, (7), 1 states have return successors, (6), 2 states have call predecessors, (6), 2 states have call successors, (6) [2023-12-02 12:30:13,549 INFO L276 IsEmpty]: Start isEmpty. Operand 51 states and 65 transitions. [2023-12-02 12:30:13,550 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 39 [2023-12-02 12:30:13,550 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 12:30:13,551 INFO L195 NwaCegarLoop]: trace histogram [4, 4, 3, 3, 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 12:30:13,556 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e6365f1c-6e1a-454b-8e39-744a0dfb75e7/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Forceful destruction successful, exit code 0 [2023-12-02 12:30:13,751 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6,8 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e6365f1c-6e1a-454b-8e39-744a0dfb75e7/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 12:30:13,751 INFO L420 AbstractCegarLoop]: === Iteration 8 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 12:30:13,752 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 12:30:13,752 INFO L85 PathProgramCache]: Analyzing trace with hash -2048234814, now seen corresponding path program 1 times [2023-12-02 12:30:13,752 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 12:30:13,752 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2087241515] [2023-12-02 12:30:13,752 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 12:30:13,752 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 12:30:13,761 ERROR L246 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2023-12-02 12:30:13,761 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1273587889] [2023-12-02 12:30:13,761 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 12:30:13,762 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 12:30:13,762 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e6365f1c-6e1a-454b-8e39-744a0dfb75e7/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 12:30:13,763 INFO L229 MonitoredProcess]: Starting monitored process 9 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e6365f1c-6e1a-454b-8e39-744a0dfb75e7/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 12:30:13,764 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e6365f1c-6e1a-454b-8e39-744a0dfb75e7/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Waiting until timeout for monitored process [2023-12-02 12:30:13,812 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 12:30:13,814 INFO L262 TraceCheckSpWp]: Trace formula consists of 130 conjuncts, 24 conjunts are in the unsatisfiable core [2023-12-02 12:30:13,816 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 12:30:14,031 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 13 proven. 2 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2023-12-02 12:30:14,031 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-12-02 12:30:14,153 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 12:30:14,153 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2087241515] [2023-12-02 12:30:14,153 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2023-12-02 12:30:14,153 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1273587889] [2023-12-02 12:30:14,153 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1273587889] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 12:30:14,153 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [2062518808] [2023-12-02 12:30:14,156 INFO L159 IcfgInterpreter]: Started Sifa with 23 locations of interest [2023-12-02 12:30:14,156 INFO L166 IcfgInterpreter]: Building call graph [2023-12-02 12:30:14,156 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-12-02 12:30:14,157 INFO L176 IcfgInterpreter]: Starting interpretation [2023-12-02 12:30:14,157 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-12-02 12:30:15,043 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 9 for LOIs [2023-12-02 12:30:15,047 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 7 for LOIs [2023-12-02 12:30:15,048 INFO L180 IcfgInterpreter]: Interpretation finished [2023-12-02 12:30:18,475 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSifa [2062518808] provided 1 perfect and 0 imperfect interpolant sequences [2023-12-02 12:30:18,475 INFO L185 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2023-12-02 12:30:18,475 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [16] imperfect sequences [9] total 24 [2023-12-02 12:30:18,475 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [590869170] [2023-12-02 12:30:18,476 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-12-02 12:30:18,476 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 17 states [2023-12-02 12:30:18,476 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 12:30:18,477 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2023-12-02 12:30:18,477 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=122, Invalid=580, Unknown=0, NotChecked=0, Total=702 [2023-12-02 12:30:18,477 INFO L87 Difference]: Start difference. First operand 51 states and 65 transitions. Second operand has 17 states, 11 states have (on average 1.1818181818181819) internal successors, (13), 10 states have internal predecessors, (13), 5 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (7), 5 states have call predecessors, (7), 5 states have call successors, (7) [2023-12-02 12:30:18,975 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 12:30:18,975 INFO L93 Difference]: Finished difference Result 75 states and 90 transitions. [2023-12-02 12:30:18,975 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2023-12-02 12:30:18,975 INFO L78 Accepts]: Start accepts. Automaton has has 17 states, 11 states have (on average 1.1818181818181819) internal successors, (13), 10 states have internal predecessors, (13), 5 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (7), 5 states have call predecessors, (7), 5 states have call successors, (7) Word has length 38 [2023-12-02 12:30:18,976 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 12:30:18,977 INFO L225 Difference]: With dead ends: 75 [2023-12-02 12:30:18,977 INFO L226 Difference]: Without dead ends: 73 [2023-12-02 12:30:18,977 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 80 GetRequests, 52 SyntacticMatches, 3 SemanticMatches, 25 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 227 ImplicationChecksByTransitivity, 3.6s TimeCoverageRelationStatistics Valid=122, Invalid=580, Unknown=0, NotChecked=0, Total=702 [2023-12-02 12:30:18,978 INFO L413 NwaCegarLoop]: 17 mSDtfsCounter, 1 mSDsluCounter, 82 mSDsCounter, 0 mSdLazyCounter, 271 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 2 SdHoareTripleChecker+Valid, 99 SdHoareTripleChecker+Invalid, 271 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 271 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2023-12-02 12:30:18,978 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [2 Valid, 99 Invalid, 271 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 271 Invalid, 0 Unknown, 0 Unchecked, 0.5s Time] [2023-12-02 12:30:18,978 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 73 states. [2023-12-02 12:30:18,991 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 73 to 71. [2023-12-02 12:30:18,992 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 71 states, 43 states have (on average 1.1627906976744187) internal successors, (50), 45 states have internal predecessors, (50), 18 states have call successors, (18), 9 states have call predecessors, (18), 9 states have return successors, (17), 16 states have call predecessors, (17), 17 states have call successors, (17) [2023-12-02 12:30:18,992 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 71 states to 71 states and 85 transitions. [2023-12-02 12:30:18,993 INFO L78 Accepts]: Start accepts. Automaton has 71 states and 85 transitions. Word has length 38 [2023-12-02 12:30:18,993 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 12:30:18,993 INFO L495 AbstractCegarLoop]: Abstraction has 71 states and 85 transitions. [2023-12-02 12:30:18,993 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 17 states, 11 states have (on average 1.1818181818181819) internal successors, (13), 10 states have internal predecessors, (13), 5 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (7), 5 states have call predecessors, (7), 5 states have call successors, (7) [2023-12-02 12:30:18,993 INFO L276 IsEmpty]: Start isEmpty. Operand 71 states and 85 transitions. [2023-12-02 12:30:18,994 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 48 [2023-12-02 12:30:18,994 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 12:30:18,994 INFO L195 NwaCegarLoop]: trace histogram [5, 4, 4, 4, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-12-02 12:30:18,999 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e6365f1c-6e1a-454b-8e39-744a0dfb75e7/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Forceful destruction successful, exit code 0 [2023-12-02 12:30:19,195 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7,9 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e6365f1c-6e1a-454b-8e39-744a0dfb75e7/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 12:30:19,195 INFO L420 AbstractCegarLoop]: === Iteration 9 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 12:30:19,196 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 12:30:19,196 INFO L85 PathProgramCache]: Analyzing trace with hash 2026078407, now seen corresponding path program 1 times [2023-12-02 12:30:19,196 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 12:30:19,196 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [115901505] [2023-12-02 12:30:19,196 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 12:30:19,196 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 12:30:19,203 ERROR L246 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2023-12-02 12:30:19,203 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1637049571] [2023-12-02 12:30:19,203 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 12:30:19,204 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 12:30:19,204 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e6365f1c-6e1a-454b-8e39-744a0dfb75e7/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 12:30:19,205 INFO L229 MonitoredProcess]: Starting monitored process 10 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e6365f1c-6e1a-454b-8e39-744a0dfb75e7/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 12:30:19,206 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e6365f1c-6e1a-454b-8e39-744a0dfb75e7/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Waiting until timeout for monitored process [2023-12-02 12:30:19,259 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 12:30:19,260 INFO L262 TraceCheckSpWp]: Trace formula consists of 157 conjuncts, 7 conjunts are in the unsatisfiable core [2023-12-02 12:30:19,262 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 12:30:19,318 INFO L134 CoverageAnalysis]: Checked inductivity of 46 backedges. 8 proven. 2 refuted. 0 times theorem prover too weak. 36 trivial. 0 not checked. [2023-12-02 12:30:19,318 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-12-02 12:30:19,374 INFO L134 CoverageAnalysis]: Checked inductivity of 46 backedges. 8 proven. 2 refuted. 0 times theorem prover too weak. 36 trivial. 0 not checked. [2023-12-02 12:30:19,375 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 12:30:19,375 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [115901505] [2023-12-02 12:30:19,375 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2023-12-02 12:30:19,375 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1637049571] [2023-12-02 12:30:19,375 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1637049571] provided 0 perfect and 2 imperfect interpolant sequences [2023-12-02 12:30:19,375 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [2001785063] [2023-12-02 12:30:19,378 INFO L159 IcfgInterpreter]: Started Sifa with 26 locations of interest [2023-12-02 12:30:19,378 INFO L166 IcfgInterpreter]: Building call graph [2023-12-02 12:30:19,378 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-12-02 12:30:19,379 INFO L176 IcfgInterpreter]: Starting interpretation [2023-12-02 12:30:19,379 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-12-02 12:30:24,204 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 113 for LOIs [2023-12-02 12:30:24,445 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 7 for LOIs [2023-12-02 12:30:24,447 INFO L180 IcfgInterpreter]: Interpretation finished [2023-12-02 12:30:30,348 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '2391#(and (<= 2 ~counter~0) (<= 1 |#StackHeapBarrier|) (= |__VERIFIER_assert_#in~cond| 0) (= __VERIFIER_assert_~cond 0) (<= ~counter~0 20))' at error location [2023-12-02 12:30:30,348 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-12-02 12:30:30,348 INFO L185 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2023-12-02 12:30:30,348 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 6] total 10 [2023-12-02 12:30:30,348 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [882188166] [2023-12-02 12:30:30,348 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2023-12-02 12:30:30,349 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 10 states [2023-12-02 12:30:30,349 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 12:30:30,349 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2023-12-02 12:30:30,350 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=163, Invalid=593, Unknown=0, NotChecked=0, Total=756 [2023-12-02 12:30:30,350 INFO L87 Difference]: Start difference. First operand 71 states and 85 transitions. Second operand has 10 states, 10 states have (on average 3.3) internal successors, (33), 10 states have internal predecessors, (33), 5 states have call successors, (17), 4 states have call predecessors, (17), 3 states have return successors, (16), 4 states have call predecessors, (16), 4 states have call successors, (16) [2023-12-02 12:30:30,547 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 12:30:30,547 INFO L93 Difference]: Finished difference Result 192 states and 235 transitions. [2023-12-02 12:30:30,548 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2023-12-02 12:30:30,548 INFO L78 Accepts]: Start accepts. Automaton has has 10 states, 10 states have (on average 3.3) internal successors, (33), 10 states have internal predecessors, (33), 5 states have call successors, (17), 4 states have call predecessors, (17), 3 states have return successors, (16), 4 states have call predecessors, (16), 4 states have call successors, (16) Word has length 47 [2023-12-02 12:30:30,548 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 12:30:30,550 INFO L225 Difference]: With dead ends: 192 [2023-12-02 12:30:30,550 INFO L226 Difference]: Without dead ends: 184 [2023-12-02 12:30:30,551 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 143 GetRequests, 109 SyntacticMatches, 4 SemanticMatches, 30 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 439 ImplicationChecksByTransitivity, 6.0s TimeCoverageRelationStatistics Valid=197, Invalid=795, Unknown=0, NotChecked=0, Total=992 [2023-12-02 12:30:30,552 INFO L413 NwaCegarLoop]: 33 mSDtfsCounter, 76 mSDsluCounter, 118 mSDsCounter, 0 mSdLazyCounter, 85 mSolverCounterSat, 16 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 76 SdHoareTripleChecker+Valid, 151 SdHoareTripleChecker+Invalid, 101 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 16 IncrementalHoareTripleChecker+Valid, 85 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-12-02 12:30:30,552 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [76 Valid, 151 Invalid, 101 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [16 Valid, 85 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-12-02 12:30:30,553 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 184 states. [2023-12-02 12:30:30,583 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 184 to 176. [2023-12-02 12:30:30,584 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 176 states, 110 states have (on average 1.2181818181818183) internal successors, (134), 114 states have internal predecessors, (134), 44 states have call successors, (44), 21 states have call predecessors, (44), 21 states have return successors, (40), 40 states have call predecessors, (40), 40 states have call successors, (40) [2023-12-02 12:30:30,586 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 176 states to 176 states and 218 transitions. [2023-12-02 12:30:30,586 INFO L78 Accepts]: Start accepts. Automaton has 176 states and 218 transitions. Word has length 47 [2023-12-02 12:30:30,587 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 12:30:30,587 INFO L495 AbstractCegarLoop]: Abstraction has 176 states and 218 transitions. [2023-12-02 12:30:30,587 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 10 states, 10 states have (on average 3.3) internal successors, (33), 10 states have internal predecessors, (33), 5 states have call successors, (17), 4 states have call predecessors, (17), 3 states have return successors, (16), 4 states have call predecessors, (16), 4 states have call successors, (16) [2023-12-02 12:30:30,587 INFO L276 IsEmpty]: Start isEmpty. Operand 176 states and 218 transitions. [2023-12-02 12:30:30,588 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 49 [2023-12-02 12:30:30,589 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 12:30:30,589 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] [2023-12-02 12:30:30,594 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e6365f1c-6e1a-454b-8e39-744a0dfb75e7/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Ended with exit code 0 [2023-12-02 12:30:30,792 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8,10 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e6365f1c-6e1a-454b-8e39-744a0dfb75e7/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 12:30:30,792 INFO L420 AbstractCegarLoop]: === Iteration 10 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 12:30:30,793 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 12:30:30,793 INFO L85 PathProgramCache]: Analyzing trace with hash -1622665511, now seen corresponding path program 1 times [2023-12-02 12:30:30,793 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 12:30:30,793 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1787725760] [2023-12-02 12:30:30,793 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 12:30:30,793 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 12:30:30,800 ERROR L246 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2023-12-02 12:30:30,800 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1397131652] [2023-12-02 12:30:30,800 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 12:30:30,800 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 12:30:30,801 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e6365f1c-6e1a-454b-8e39-744a0dfb75e7/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 12:30:30,801 INFO L229 MonitoredProcess]: Starting monitored process 11 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e6365f1c-6e1a-454b-8e39-744a0dfb75e7/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 12:30:30,802 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e6365f1c-6e1a-454b-8e39-744a0dfb75e7/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Waiting until timeout for monitored process [2023-12-02 12:30:30,848 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 12:30:30,850 INFO L262 TraceCheckSpWp]: Trace formula consists of 159 conjuncts, 9 conjunts are in the unsatisfiable core [2023-12-02 12:30:30,852 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 12:30:30,892 INFO L134 CoverageAnalysis]: Checked inductivity of 47 backedges. 8 proven. 6 refuted. 0 times theorem prover too weak. 33 trivial. 0 not checked. [2023-12-02 12:30:30,892 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-12-02 12:30:30,948 INFO L134 CoverageAnalysis]: Checked inductivity of 47 backedges. 8 proven. 6 refuted. 0 times theorem prover too weak. 33 trivial. 0 not checked. [2023-12-02 12:30:30,948 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 12:30:30,948 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1787725760] [2023-12-02 12:30:30,948 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2023-12-02 12:30:30,948 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1397131652] [2023-12-02 12:30:30,948 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1397131652] provided 0 perfect and 2 imperfect interpolant sequences [2023-12-02 12:30:30,948 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [2027104610] [2023-12-02 12:30:30,950 INFO L159 IcfgInterpreter]: Started Sifa with 26 locations of interest [2023-12-02 12:30:30,951 INFO L166 IcfgInterpreter]: Building call graph [2023-12-02 12:30:30,951 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-12-02 12:30:30,951 INFO L176 IcfgInterpreter]: Starting interpretation [2023-12-02 12:30:30,951 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-12-02 12:30:35,351 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 109 for LOIs [2023-12-02 12:30:35,603 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 7 for LOIs [2023-12-02 12:30:35,604 INFO L180 IcfgInterpreter]: Interpretation finished [2023-12-02 12:30:40,929 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '3237#(and (<= 2 ~counter~0) (<= 1 |#StackHeapBarrier|) (= |__VERIFIER_assert_#in~cond| 0) (= __VERIFIER_assert_~cond 0) (<= ~counter~0 20))' at error location [2023-12-02 12:30:40,929 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-12-02 12:30:40,929 INFO L185 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2023-12-02 12:30:40,929 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7] total 7 [2023-12-02 12:30:40,929 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1773492314] [2023-12-02 12:30:40,929 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2023-12-02 12:30:40,930 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2023-12-02 12:30:40,930 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 12:30:40,931 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2023-12-02 12:30:40,932 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=108, Invalid=492, Unknown=0, NotChecked=0, Total=600 [2023-12-02 12:30:40,932 INFO L87 Difference]: Start difference. First operand 176 states and 218 transitions. Second operand has 7 states, 6 states have (on average 3.3333333333333335) internal successors, (20), 6 states have internal predecessors, (20), 5 states have call successors, (9), 2 states have call predecessors, (9), 2 states have return successors, (8), 3 states have call predecessors, (8), 4 states have call successors, (8) [2023-12-02 12:30:41,180 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 12:30:41,180 INFO L93 Difference]: Finished difference Result 264 states and 353 transitions. [2023-12-02 12:30:41,181 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2023-12-02 12:30:41,181 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 6 states have (on average 3.3333333333333335) internal successors, (20), 6 states have internal predecessors, (20), 5 states have call successors, (9), 2 states have call predecessors, (9), 2 states have return successors, (8), 3 states have call predecessors, (8), 4 states have call successors, (8) Word has length 48 [2023-12-02 12:30:41,181 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 12:30:41,183 INFO L225 Difference]: With dead ends: 264 [2023-12-02 12:30:41,183 INFO L226 Difference]: Without dead ends: 244 [2023-12-02 12:30:41,184 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 148 GetRequests, 111 SyntacticMatches, 8 SemanticMatches, 29 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 243 ImplicationChecksByTransitivity, 5.5s TimeCoverageRelationStatistics Valid=185, Invalid=745, Unknown=0, NotChecked=0, Total=930 [2023-12-02 12:30:41,185 INFO L413 NwaCegarLoop]: 44 mSDtfsCounter, 68 mSDsluCounter, 185 mSDsCounter, 0 mSdLazyCounter, 72 mSolverCounterSat, 40 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 73 SdHoareTripleChecker+Valid, 229 SdHoareTripleChecker+Invalid, 112 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 40 IncrementalHoareTripleChecker+Valid, 72 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-12-02 12:30:41,185 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [73 Valid, 229 Invalid, 112 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [40 Valid, 72 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-12-02 12:30:41,186 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 244 states. [2023-12-02 12:30:41,221 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 244 to 220. [2023-12-02 12:30:41,221 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 220 states, 140 states have (on average 1.25) internal successors, (175), 143 states have internal predecessors, (175), 58 states have call successors, (58), 21 states have call predecessors, (58), 21 states have return successors, (55), 55 states have call predecessors, (55), 55 states have call successors, (55) [2023-12-02 12:30:41,223 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 220 states to 220 states and 288 transitions. [2023-12-02 12:30:41,224 INFO L78 Accepts]: Start accepts. Automaton has 220 states and 288 transitions. Word has length 48 [2023-12-02 12:30:41,224 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 12:30:41,224 INFO L495 AbstractCegarLoop]: Abstraction has 220 states and 288 transitions. [2023-12-02 12:30:41,224 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 6 states have (on average 3.3333333333333335) internal successors, (20), 6 states have internal predecessors, (20), 5 states have call successors, (9), 2 states have call predecessors, (9), 2 states have return successors, (8), 3 states have call predecessors, (8), 4 states have call successors, (8) [2023-12-02 12:30:41,224 INFO L276 IsEmpty]: Start isEmpty. Operand 220 states and 288 transitions. [2023-12-02 12:30:41,225 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 51 [2023-12-02 12:30:41,225 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 12:30:41,226 INFO L195 NwaCegarLoop]: trace histogram [5, 4, 4, 4, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-12-02 12:30:41,230 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e6365f1c-6e1a-454b-8e39-744a0dfb75e7/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Ended with exit code 0 [2023-12-02 12:30:41,426 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable9,11 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e6365f1c-6e1a-454b-8e39-744a0dfb75e7/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 12:30:41,426 INFO L420 AbstractCegarLoop]: === Iteration 11 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 12:30:41,427 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 12:30:41,427 INFO L85 PathProgramCache]: Analyzing trace with hash -1919469378, now seen corresponding path program 1 times [2023-12-02 12:30:41,427 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 12:30:41,427 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2122071169] [2023-12-02 12:30:41,427 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 12:30:41,427 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 12:30:41,435 ERROR L246 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2023-12-02 12:30:41,435 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [778701039] [2023-12-02 12:30:41,435 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 12:30:41,436 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 12:30:41,436 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e6365f1c-6e1a-454b-8e39-744a0dfb75e7/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 12:30:41,437 INFO L229 MonitoredProcess]: Starting monitored process 12 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e6365f1c-6e1a-454b-8e39-744a0dfb75e7/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 12:30:41,438 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e6365f1c-6e1a-454b-8e39-744a0dfb75e7/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Waiting until timeout for monitored process [2023-12-02 12:30:41,490 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 12:30:41,491 INFO L262 TraceCheckSpWp]: Trace formula consists of 168 conjuncts, 7 conjunts are in the unsatisfiable core [2023-12-02 12:30:41,493 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 12:30:41,539 INFO L134 CoverageAnalysis]: Checked inductivity of 49 backedges. 11 proven. 2 refuted. 0 times theorem prover too weak. 36 trivial. 0 not checked. [2023-12-02 12:30:41,539 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-12-02 12:30:41,593 INFO L134 CoverageAnalysis]: Checked inductivity of 49 backedges. 11 proven. 2 refuted. 0 times theorem prover too weak. 36 trivial. 0 not checked. [2023-12-02 12:30:41,593 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 12:30:41,593 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2122071169] [2023-12-02 12:30:41,593 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2023-12-02 12:30:41,593 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [778701039] [2023-12-02 12:30:41,593 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [778701039] provided 0 perfect and 2 imperfect interpolant sequences [2023-12-02 12:30:41,593 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1538351458] [2023-12-02 12:30:41,596 INFO L159 IcfgInterpreter]: Started Sifa with 26 locations of interest [2023-12-02 12:30:41,596 INFO L166 IcfgInterpreter]: Building call graph [2023-12-02 12:30:41,596 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-12-02 12:30:41,597 INFO L176 IcfgInterpreter]: Starting interpretation [2023-12-02 12:30:41,597 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-12-02 12:30:47,975 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 1 for LOIs [2023-12-02 12:30:47,978 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 7 for LOIs [2023-12-02 12:30:47,979 INFO L180 IcfgInterpreter]: Interpretation finished [2023-12-02 12:30:51,451 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '4284#(and (= |__VERIFIER_assert_#in~cond| 0) (= __VERIFIER_assert_~cond 0))' at error location [2023-12-02 12:30:51,451 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-12-02 12:30:51,452 INFO L185 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2023-12-02 12:30:51,452 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 6] total 10 [2023-12-02 12:30:51,452 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2070156418] [2023-12-02 12:30:51,452 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2023-12-02 12:30:51,452 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 10 states [2023-12-02 12:30:51,452 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 12:30:51,453 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2023-12-02 12:30:51,453 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=155, Invalid=775, Unknown=0, NotChecked=0, Total=930 [2023-12-02 12:30:51,453 INFO L87 Difference]: Start difference. First operand 220 states and 288 transitions. Second operand has 10 states, 10 states have (on average 3.5) internal successors, (35), 10 states have internal predecessors, (35), 5 states have call successors, (17), 4 states have call predecessors, (17), 3 states have return successors, (16), 4 states have call predecessors, (16), 4 states have call successors, (16) [2023-12-02 12:30:51,644 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 12:30:51,644 INFO L93 Difference]: Finished difference Result 331 states and 438 transitions. [2023-12-02 12:30:51,644 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2023-12-02 12:30:51,645 INFO L78 Accepts]: Start accepts. Automaton has has 10 states, 10 states have (on average 3.5) internal successors, (35), 10 states have internal predecessors, (35), 5 states have call successors, (17), 4 states have call predecessors, (17), 3 states have return successors, (16), 4 states have call predecessors, (16), 4 states have call successors, (16) Word has length 50 [2023-12-02 12:30:51,645 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 12:30:51,647 INFO L225 Difference]: With dead ends: 331 [2023-12-02 12:30:51,647 INFO L226 Difference]: Without dead ends: 235 [2023-12-02 12:30:51,649 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 152 GetRequests, 119 SyntacticMatches, 0 SemanticMatches, 33 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 393 ImplicationChecksByTransitivity, 3.6s TimeCoverageRelationStatistics Valid=185, Invalid=1005, Unknown=0, NotChecked=0, Total=1190 [2023-12-02 12:30:51,650 INFO L413 NwaCegarLoop]: 35 mSDtfsCounter, 70 mSDsluCounter, 117 mSDsCounter, 0 mSdLazyCounter, 79 mSolverCounterSat, 13 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 70 SdHoareTripleChecker+Valid, 152 SdHoareTripleChecker+Invalid, 92 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 13 IncrementalHoareTripleChecker+Valid, 79 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-12-02 12:30:51,650 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [70 Valid, 152 Invalid, 92 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [13 Valid, 79 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-12-02 12:30:51,651 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 235 states. [2023-12-02 12:30:51,674 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 235 to 229. [2023-12-02 12:30:51,675 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 229 states, 149 states have (on average 1.1946308724832215) internal successors, (178), 152 states have internal predecessors, (178), 58 states have call successors, (58), 21 states have call predecessors, (58), 21 states have return successors, (55), 55 states have call predecessors, (55), 55 states have call successors, (55) [2023-12-02 12:30:51,676 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 229 states to 229 states and 291 transitions. [2023-12-02 12:30:51,676 INFO L78 Accepts]: Start accepts. Automaton has 229 states and 291 transitions. Word has length 50 [2023-12-02 12:30:51,677 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 12:30:51,677 INFO L495 AbstractCegarLoop]: Abstraction has 229 states and 291 transitions. [2023-12-02 12:30:51,677 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 10 states, 10 states have (on average 3.5) internal successors, (35), 10 states have internal predecessors, (35), 5 states have call successors, (17), 4 states have call predecessors, (17), 3 states have return successors, (16), 4 states have call predecessors, (16), 4 states have call successors, (16) [2023-12-02 12:30:51,677 INFO L276 IsEmpty]: Start isEmpty. Operand 229 states and 291 transitions. [2023-12-02 12:30:51,678 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 56 [2023-12-02 12:30:51,678 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 12:30:51,678 INFO L195 NwaCegarLoop]: trace histogram [6, 5, 5, 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 12:30:51,682 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e6365f1c-6e1a-454b-8e39-744a0dfb75e7/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Ended with exit code 0 [2023-12-02 12:30:51,878 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable10,12 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e6365f1c-6e1a-454b-8e39-744a0dfb75e7/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 12:30:51,879 INFO L420 AbstractCegarLoop]: === Iteration 12 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 12:30:51,879 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 12:30:51,879 INFO L85 PathProgramCache]: Analyzing trace with hash -944843688, now seen corresponding path program 1 times [2023-12-02 12:30:51,879 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 12:30:51,879 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1530218593] [2023-12-02 12:30:51,879 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 12:30:51,879 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 12:30:51,887 ERROR L246 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2023-12-02 12:30:51,887 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [648930315] [2023-12-02 12:30:51,887 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 12:30:51,887 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 12:30:51,888 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e6365f1c-6e1a-454b-8e39-744a0dfb75e7/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 12:30:51,889 INFO L229 MonitoredProcess]: Starting monitored process 13 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e6365f1c-6e1a-454b-8e39-744a0dfb75e7/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 12:30:51,890 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e6365f1c-6e1a-454b-8e39-744a0dfb75e7/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Waiting until timeout for monitored process [2023-12-02 12:30:51,942 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 12:30:51,944 INFO L262 TraceCheckSpWp]: Trace formula consists of 176 conjuncts, 26 conjunts are in the unsatisfiable core [2023-12-02 12:30:51,945 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 12:30:52,018 INFO L134 CoverageAnalysis]: Checked inductivity of 69 backedges. 23 proven. 12 refuted. 0 times theorem prover too weak. 34 trivial. 0 not checked. [2023-12-02 12:30:52,018 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-12-02 12:30:52,104 INFO L134 CoverageAnalysis]: Checked inductivity of 69 backedges. 22 proven. 7 refuted. 0 times theorem prover too weak. 40 trivial. 0 not checked. [2023-12-02 12:30:52,105 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 12:30:52,105 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1530218593] [2023-12-02 12:30:52,105 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2023-12-02 12:30:52,105 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [648930315] [2023-12-02 12:30:52,105 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [648930315] provided 0 perfect and 2 imperfect interpolant sequences [2023-12-02 12:30:52,105 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [94689630] [2023-12-02 12:30:52,107 INFO L159 IcfgInterpreter]: Started Sifa with 25 locations of interest [2023-12-02 12:30:52,107 INFO L166 IcfgInterpreter]: Building call graph [2023-12-02 12:30:52,108 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-12-02 12:30:52,108 INFO L176 IcfgInterpreter]: Starting interpretation [2023-12-02 12:30:52,108 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-12-02 12:30:56,350 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 113 for LOIs [2023-12-02 12:30:56,575 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 7 for LOIs [2023-12-02 12:30:56,576 INFO L180 IcfgInterpreter]: Interpretation finished [2023-12-02 12:31:03,622 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '5467#(and (<= 2 ~counter~0) (<= 1 |#StackHeapBarrier|) (= |__VERIFIER_assert_#in~cond| 0) (= __VERIFIER_assert_~cond 0) (<= ~counter~0 20))' at error location [2023-12-02 12:31:03,622 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-12-02 12:31:03,623 INFO L185 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2023-12-02 12:31:03,623 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 7] total 13 [2023-12-02 12:31:03,623 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [266391400] [2023-12-02 12:31:03,623 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2023-12-02 12:31:03,623 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 13 states [2023-12-02 12:31:03,623 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 12:31:03,624 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2023-12-02 12:31:03,624 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=126, Invalid=804, Unknown=0, NotChecked=0, Total=930 [2023-12-02 12:31:03,625 INFO L87 Difference]: Start difference. First operand 229 states and 291 transitions. Second operand has 13 states, 13 states have (on average 3.1538461538461537) internal successors, (41), 12 states have internal predecessors, (41), 6 states have call successors, (18), 3 states have call predecessors, (18), 2 states have return successors, (16), 6 states have call predecessors, (16), 6 states have call successors, (16) [2023-12-02 12:31:04,017 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 12:31:04,017 INFO L93 Difference]: Finished difference Result 315 states and 418 transitions. [2023-12-02 12:31:04,017 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2023-12-02 12:31:04,018 INFO L78 Accepts]: Start accepts. Automaton has has 13 states, 13 states have (on average 3.1538461538461537) internal successors, (41), 12 states have internal predecessors, (41), 6 states have call successors, (18), 3 states have call predecessors, (18), 2 states have return successors, (16), 6 states have call predecessors, (16), 6 states have call successors, (16) Word has length 55 [2023-12-02 12:31:04,018 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 12:31:04,021 INFO L225 Difference]: With dead ends: 315 [2023-12-02 12:31:04,021 INFO L226 Difference]: Without dead ends: 309 [2023-12-02 12:31:04,022 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 171 GetRequests, 132 SyntacticMatches, 5 SemanticMatches, 34 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 420 ImplicationChecksByTransitivity, 7.2s TimeCoverageRelationStatistics Valid=171, Invalid=1089, Unknown=0, NotChecked=0, Total=1260 [2023-12-02 12:31:04,023 INFO L413 NwaCegarLoop]: 45 mSDtfsCounter, 41 mSDsluCounter, 218 mSDsCounter, 0 mSdLazyCounter, 168 mSolverCounterSat, 35 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 47 SdHoareTripleChecker+Valid, 263 SdHoareTripleChecker+Invalid, 203 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 35 IncrementalHoareTripleChecker+Valid, 168 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2023-12-02 12:31:04,023 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [47 Valid, 263 Invalid, 203 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [35 Valid, 168 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2023-12-02 12:31:04,024 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 309 states. [2023-12-02 12:31:04,064 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 309 to 276. [2023-12-02 12:31:04,065 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 276 states, 182 states have (on average 1.2142857142857142) internal successors, (221), 191 states have internal predecessors, (221), 69 states have call successors, (69), 24 states have call predecessors, (69), 24 states have return successors, (65), 60 states have call predecessors, (65), 65 states have call successors, (65) [2023-12-02 12:31:04,067 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 276 states to 276 states and 355 transitions. [2023-12-02 12:31:04,068 INFO L78 Accepts]: Start accepts. Automaton has 276 states and 355 transitions. Word has length 55 [2023-12-02 12:31:04,068 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 12:31:04,068 INFO L495 AbstractCegarLoop]: Abstraction has 276 states and 355 transitions. [2023-12-02 12:31:04,068 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 13 states, 13 states have (on average 3.1538461538461537) internal successors, (41), 12 states have internal predecessors, (41), 6 states have call successors, (18), 3 states have call predecessors, (18), 2 states have return successors, (16), 6 states have call predecessors, (16), 6 states have call successors, (16) [2023-12-02 12:31:04,069 INFO L276 IsEmpty]: Start isEmpty. Operand 276 states and 355 transitions. [2023-12-02 12:31:04,069 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 61 [2023-12-02 12:31:04,069 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 12:31:04,070 INFO L195 NwaCegarLoop]: trace histogram [7, 6, 6, 4, 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] [2023-12-02 12:31:04,074 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e6365f1c-6e1a-454b-8e39-744a0dfb75e7/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Ended with exit code 0 [2023-12-02 12:31:04,270 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable11,13 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e6365f1c-6e1a-454b-8e39-744a0dfb75e7/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 12:31:04,270 INFO L420 AbstractCegarLoop]: === Iteration 13 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 12:31:04,271 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 12:31:04,271 INFO L85 PathProgramCache]: Analyzing trace with hash 1149067400, now seen corresponding path program 2 times [2023-12-02 12:31:04,271 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 12:31:04,271 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [638192679] [2023-12-02 12:31:04,271 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 12:31:04,271 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 12:31:04,282 ERROR L246 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2023-12-02 12:31:04,282 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1338694571] [2023-12-02 12:31:04,282 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2023-12-02 12:31:04,282 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 12:31:04,282 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e6365f1c-6e1a-454b-8e39-744a0dfb75e7/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 12:31:04,284 INFO L229 MonitoredProcess]: Starting monitored process 14 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e6365f1c-6e1a-454b-8e39-744a0dfb75e7/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 12:31:04,285 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e6365f1c-6e1a-454b-8e39-744a0dfb75e7/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (14)] Waiting until timeout for monitored process [2023-12-02 12:31:04,345 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2023-12-02 12:31:04,345 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-12-02 12:31:04,346 INFO L262 TraceCheckSpWp]: Trace formula consists of 176 conjuncts, 39 conjunts are in the unsatisfiable core [2023-12-02 12:31:04,348 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 12:31:04,739 INFO L134 CoverageAnalysis]: Checked inductivity of 92 backedges. 14 proven. 10 refuted. 0 times theorem prover too weak. 68 trivial. 0 not checked. [2023-12-02 12:31:04,739 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-12-02 12:31:05,233 INFO L134 CoverageAnalysis]: Checked inductivity of 92 backedges. 12 proven. 8 refuted. 0 times theorem prover too weak. 72 trivial. 0 not checked. [2023-12-02 12:31:05,233 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 12:31:05,233 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [638192679] [2023-12-02 12:31:05,233 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2023-12-02 12:31:05,233 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1338694571] [2023-12-02 12:31:05,233 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1338694571] provided 0 perfect and 2 imperfect interpolant sequences [2023-12-02 12:31:05,233 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [16354288] [2023-12-02 12:31:05,235 INFO L159 IcfgInterpreter]: Started Sifa with 25 locations of interest [2023-12-02 12:31:05,235 INFO L166 IcfgInterpreter]: Building call graph [2023-12-02 12:31:05,236 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-12-02 12:31:05,236 INFO L176 IcfgInterpreter]: Starting interpretation [2023-12-02 12:31:05,236 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-12-02 12:31:09,447 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 113 for LOIs [2023-12-02 12:31:09,664 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 7 for LOIs [2023-12-02 12:31:09,666 INFO L180 IcfgInterpreter]: Interpretation finished [2023-12-02 12:31:18,816 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '6739#(and (<= 2 ~counter~0) (<= 1 |#StackHeapBarrier|) (= |__VERIFIER_assert_#in~cond| 0) (= __VERIFIER_assert_~cond 0) (<= ~counter~0 20))' at error location [2023-12-02 12:31:18,817 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-12-02 12:31:18,817 INFO L185 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2023-12-02 12:31:18,817 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 8] total 17 [2023-12-02 12:31:18,817 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [205394936] [2023-12-02 12:31:18,817 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2023-12-02 12:31:18,818 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 17 states [2023-12-02 12:31:18,818 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 12:31:18,818 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2023-12-02 12:31:18,819 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=169, Invalid=1021, Unknown=0, NotChecked=0, Total=1190 [2023-12-02 12:31:18,819 INFO L87 Difference]: Start difference. First operand 276 states and 355 transitions. Second operand has 17 states, 15 states have (on average 2.533333333333333) internal successors, (38), 14 states have internal predecessors, (38), 9 states have call successors, (22), 3 states have call predecessors, (22), 2 states have return successors, (20), 8 states have call predecessors, (20), 9 states have call successors, (20) [2023-12-02 12:31:23,664 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 12:31:23,664 INFO L93 Difference]: Finished difference Result 467 states and 643 transitions. [2023-12-02 12:31:23,664 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 24 states. [2023-12-02 12:31:23,665 INFO L78 Accepts]: Start accepts. Automaton has has 17 states, 15 states have (on average 2.533333333333333) internal successors, (38), 14 states have internal predecessors, (38), 9 states have call successors, (22), 3 states have call predecessors, (22), 2 states have return successors, (20), 8 states have call predecessors, (20), 9 states have call successors, (20) Word has length 60 [2023-12-02 12:31:23,665 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 12:31:23,669 INFO L225 Difference]: With dead ends: 467 [2023-12-02 12:31:23,669 INFO L226 Difference]: Without dead ends: 465 [2023-12-02 12:31:23,670 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 195 GetRequests, 139 SyntacticMatches, 6 SemanticMatches, 50 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 804 ImplicationChecksByTransitivity, 12.6s TimeCoverageRelationStatistics Valid=433, Invalid=2219, Unknown=0, NotChecked=0, Total=2652 [2023-12-02 12:31:23,671 INFO L413 NwaCegarLoop]: 36 mSDtfsCounter, 193 mSDsluCounter, 295 mSDsCounter, 0 mSdLazyCounter, 283 mSolverCounterSat, 127 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 197 SdHoareTripleChecker+Valid, 331 SdHoareTripleChecker+Invalid, 410 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 127 IncrementalHoareTripleChecker+Valid, 283 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.7s IncrementalHoareTripleChecker+Time [2023-12-02 12:31:23,671 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [197 Valid, 331 Invalid, 410 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [127 Valid, 283 Invalid, 0 Unknown, 0 Unchecked, 1.7s Time] [2023-12-02 12:31:23,672 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 465 states. [2023-12-02 12:31:23,761 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 465 to 413. [2023-12-02 12:31:23,762 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 413 states, 272 states have (on average 1.2647058823529411) internal successors, (344), 284 states have internal predecessors, (344), 108 states have call successors, (108), 32 states have call predecessors, (108), 32 states have return successors, (104), 96 states have call predecessors, (104), 104 states have call successors, (104) [2023-12-02 12:31:23,764 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 413 states to 413 states and 556 transitions. [2023-12-02 12:31:23,765 INFO L78 Accepts]: Start accepts. Automaton has 413 states and 556 transitions. Word has length 60 [2023-12-02 12:31:23,765 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 12:31:23,765 INFO L495 AbstractCegarLoop]: Abstraction has 413 states and 556 transitions. [2023-12-02 12:31:23,766 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 17 states, 15 states have (on average 2.533333333333333) internal successors, (38), 14 states have internal predecessors, (38), 9 states have call successors, (22), 3 states have call predecessors, (22), 2 states have return successors, (20), 8 states have call predecessors, (20), 9 states have call successors, (20) [2023-12-02 12:31:23,766 INFO L276 IsEmpty]: Start isEmpty. Operand 413 states and 556 transitions. [2023-12-02 12:31:23,766 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 62 [2023-12-02 12:31:23,767 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 12:31:23,767 INFO L195 NwaCegarLoop]: trace histogram [8, 7, 7, 4, 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] [2023-12-02 12:31:23,771 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e6365f1c-6e1a-454b-8e39-744a0dfb75e7/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (14)] Ended with exit code 0 [2023-12-02 12:31:23,967 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 14 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e6365f1c-6e1a-454b-8e39-744a0dfb75e7/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable12 [2023-12-02 12:31:23,967 INFO L420 AbstractCegarLoop]: === Iteration 14 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 12:31:23,968 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 12:31:23,968 INFO L85 PathProgramCache]: Analyzing trace with hash 1428661434, now seen corresponding path program 1 times [2023-12-02 12:31:23,968 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 12:31:23,968 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [646250906] [2023-12-02 12:31:23,968 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 12:31:23,968 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 12:31:23,977 ERROR L246 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2023-12-02 12:31:23,977 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [774568323] [2023-12-02 12:31:23,977 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 12:31:23,977 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 12:31:23,977 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e6365f1c-6e1a-454b-8e39-744a0dfb75e7/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 12:31:23,978 INFO L229 MonitoredProcess]: Starting monitored process 15 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e6365f1c-6e1a-454b-8e39-744a0dfb75e7/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 12:31:23,979 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e6365f1c-6e1a-454b-8e39-744a0dfb75e7/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (15)] Waiting until timeout for monitored process [2023-12-02 12:31:24,028 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 12:31:24,030 INFO L262 TraceCheckSpWp]: Trace formula consists of 176 conjuncts, 11 conjunts are in the unsatisfiable core [2023-12-02 12:31:24,032 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 12:31:24,113 INFO L134 CoverageAnalysis]: Checked inductivity of 116 backedges. 28 proven. 10 refuted. 0 times theorem prover too weak. 78 trivial. 0 not checked. [2023-12-02 12:31:24,113 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-12-02 12:31:24,206 INFO L134 CoverageAnalysis]: Checked inductivity of 116 backedges. 28 proven. 10 refuted. 0 times theorem prover too weak. 78 trivial. 0 not checked. [2023-12-02 12:31:24,206 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 12:31:24,207 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [646250906] [2023-12-02 12:31:24,207 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2023-12-02 12:31:24,207 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [774568323] [2023-12-02 12:31:24,207 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [774568323] provided 0 perfect and 2 imperfect interpolant sequences [2023-12-02 12:31:24,207 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [38080400] [2023-12-02 12:31:24,209 INFO L159 IcfgInterpreter]: Started Sifa with 24 locations of interest [2023-12-02 12:31:24,209 INFO L166 IcfgInterpreter]: Building call graph [2023-12-02 12:31:24,209 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-12-02 12:31:24,209 INFO L176 IcfgInterpreter]: Starting interpretation [2023-12-02 12:31:24,210 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-12-02 12:31:26,645 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 1 for LOIs [2023-12-02 12:31:26,648 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 7 for LOIs [2023-12-02 12:31:26,649 INFO L180 IcfgInterpreter]: Interpretation finished [2023-12-02 12:31:30,044 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '8462#(and (= |__VERIFIER_assert_#in~cond| 0) (= __VERIFIER_assert_~cond 0))' at error location [2023-12-02 12:31:30,044 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-12-02 12:31:30,044 INFO L185 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2023-12-02 12:31:30,044 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 6] total 9 [2023-12-02 12:31:30,045 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [302263033] [2023-12-02 12:31:30,045 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2023-12-02 12:31:30,045 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 9 states [2023-12-02 12:31:30,045 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 12:31:30,045 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2023-12-02 12:31:30,046 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=107, Invalid=649, Unknown=0, NotChecked=0, Total=756 [2023-12-02 12:31:30,046 INFO L87 Difference]: Start difference. First operand 413 states and 556 transitions. Second operand has 9 states, 9 states have (on average 2.6666666666666665) internal successors, (24), 8 states have internal predecessors, (24), 2 states have call successors, (13), 3 states have call predecessors, (13), 2 states have return successors, (11), 2 states have call predecessors, (11), 2 states have call successors, (11) [2023-12-02 12:31:30,233 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 12:31:30,233 INFO L93 Difference]: Finished difference Result 430 states and 575 transitions. [2023-12-02 12:31:30,234 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2023-12-02 12:31:30,234 INFO L78 Accepts]: Start accepts. Automaton has has 9 states, 9 states have (on average 2.6666666666666665) internal successors, (24), 8 states have internal predecessors, (24), 2 states have call successors, (13), 3 states have call predecessors, (13), 2 states have return successors, (11), 2 states have call predecessors, (11), 2 states have call successors, (11) Word has length 61 [2023-12-02 12:31:30,234 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 12:31:30,237 INFO L225 Difference]: With dead ends: 430 [2023-12-02 12:31:30,237 INFO L226 Difference]: Without dead ends: 428 [2023-12-02 12:31:30,238 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 183 GetRequests, 155 SyntacticMatches, 1 SemanticMatches, 27 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 220 ImplicationChecksByTransitivity, 3.4s TimeCoverageRelationStatistics Valid=116, Invalid=696, Unknown=0, NotChecked=0, Total=812 [2023-12-02 12:31:30,238 INFO L413 NwaCegarLoop]: 26 mSDtfsCounter, 17 mSDsluCounter, 104 mSDsCounter, 0 mSdLazyCounter, 95 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 19 SdHoareTripleChecker+Valid, 130 SdHoareTripleChecker+Invalid, 97 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 95 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-12-02 12:31:30,239 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [19 Valid, 130 Invalid, 97 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 95 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-12-02 12:31:30,240 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 428 states. [2023-12-02 12:31:30,361 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 428 to 428. [2023-12-02 12:31:30,361 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 428 states, 281 states have (on average 1.2526690391459074) internal successors, (352), 293 states have internal predecessors, (352), 111 states have call successors, (111), 35 states have call predecessors, (111), 35 states have return successors, (107), 99 states have call predecessors, (107), 107 states have call successors, (107) [2023-12-02 12:31:30,364 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 428 states to 428 states and 570 transitions. [2023-12-02 12:31:30,364 INFO L78 Accepts]: Start accepts. Automaton has 428 states and 570 transitions. Word has length 61 [2023-12-02 12:31:30,364 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 12:31:30,365 INFO L495 AbstractCegarLoop]: Abstraction has 428 states and 570 transitions. [2023-12-02 12:31:30,365 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 9 states, 9 states have (on average 2.6666666666666665) internal successors, (24), 8 states have internal predecessors, (24), 2 states have call successors, (13), 3 states have call predecessors, (13), 2 states have return successors, (11), 2 states have call predecessors, (11), 2 states have call successors, (11) [2023-12-02 12:31:30,365 INFO L276 IsEmpty]: Start isEmpty. Operand 428 states and 570 transitions. [2023-12-02 12:31:30,365 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 66 [2023-12-02 12:31:30,365 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 12:31:30,365 INFO L195 NwaCegarLoop]: trace histogram [8, 7, 7, 4, 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 12:31:30,370 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e6365f1c-6e1a-454b-8e39-744a0dfb75e7/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (15)] Ended with exit code 0 [2023-12-02 12:31:30,566 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 15 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e6365f1c-6e1a-454b-8e39-744a0dfb75e7/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable13 [2023-12-02 12:31:30,566 INFO L420 AbstractCegarLoop]: === Iteration 15 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 12:31:30,566 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 12:31:30,567 INFO L85 PathProgramCache]: Analyzing trace with hash -789837288, now seen corresponding path program 3 times [2023-12-02 12:31:30,567 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 12:31:30,567 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [124627783] [2023-12-02 12:31:30,567 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 12:31:30,567 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 12:31:30,574 ERROR L246 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2023-12-02 12:31:30,574 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1251710761] [2023-12-02 12:31:30,574 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2023-12-02 12:31:30,574 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 12:31:30,574 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e6365f1c-6e1a-454b-8e39-744a0dfb75e7/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 12:31:30,575 INFO L229 MonitoredProcess]: Starting monitored process 16 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e6365f1c-6e1a-454b-8e39-744a0dfb75e7/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 12:31:30,585 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e6365f1c-6e1a-454b-8e39-744a0dfb75e7/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (16)] Waiting until timeout for monitored process [2023-12-02 12:31:30,644 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2023-12-02 12:31:30,645 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-12-02 12:31:30,646 INFO L262 TraceCheckSpWp]: Trace formula consists of 157 conjuncts, 38 conjunts are in the unsatisfiable core [2023-12-02 12:31:30,649 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 12:31:31,059 INFO L134 CoverageAnalysis]: Checked inductivity of 119 backedges. 31 proven. 13 refuted. 0 times theorem prover too weak. 75 trivial. 0 not checked. [2023-12-02 12:31:31,060 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-12-02 12:31:33,681 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 12:31:33,681 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [124627783] [2023-12-02 12:31:33,681 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2023-12-02 12:31:33,681 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1251710761] [2023-12-02 12:31:33,682 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1251710761] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 12:31:33,682 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [815426498] [2023-12-02 12:31:33,683 INFO L159 IcfgInterpreter]: Started Sifa with 25 locations of interest [2023-12-02 12:31:33,683 INFO L166 IcfgInterpreter]: Building call graph [2023-12-02 12:31:33,683 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-12-02 12:31:33,683 INFO L176 IcfgInterpreter]: Starting interpretation [2023-12-02 12:31:33,683 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-12-02 12:31:37,974 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 113 for LOIs [2023-12-02 12:31:38,189 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 7 for LOIs [2023-12-02 12:31:38,190 INFO L180 IcfgInterpreter]: Interpretation finished [2023-12-02 12:31:47,592 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '10035#(and (<= 2 ~counter~0) (<= 1 |#StackHeapBarrier|) (= |__VERIFIER_assert_#in~cond| 0) (= __VERIFIER_assert_~cond 0) (<= ~counter~0 20))' at error location [2023-12-02 12:31:47,593 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-12-02 12:31:47,593 INFO L185 FreeRefinementEngine]: Found 0 perfect and 1 imperfect interpolant sequences. [2023-12-02 12:31:47,593 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11] total 11 [2023-12-02 12:31:47,593 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [796997773] [2023-12-02 12:31:47,593 INFO L85 oduleStraightlineAll]: Using 1 imperfect interpolants to construct interpolant automaton [2023-12-02 12:31:47,593 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 11 states [2023-12-02 12:31:47,593 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 12:31:47,594 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2023-12-02 12:31:47,594 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=159, Invalid=963, Unknown=0, NotChecked=0, Total=1122 [2023-12-02 12:31:47,594 INFO L87 Difference]: Start difference. First operand 428 states and 570 transitions. Second operand has 11 states, 10 states have (on average 2.5) internal successors, (25), 9 states have internal predecessors, (25), 5 states have call successors, (12), 2 states have call predecessors, (12), 3 states have return successors, (11), 4 states have call predecessors, (11), 5 states have call successors, (11) [2023-12-02 12:31:48,253 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 12:31:48,253 INFO L93 Difference]: Finished difference Result 661 states and 920 transitions. [2023-12-02 12:31:48,254 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2023-12-02 12:31:48,254 INFO L78 Accepts]: Start accepts. Automaton has has 11 states, 10 states have (on average 2.5) internal successors, (25), 9 states have internal predecessors, (25), 5 states have call successors, (12), 2 states have call predecessors, (12), 3 states have return successors, (11), 4 states have call predecessors, (11), 5 states have call successors, (11) Word has length 65 [2023-12-02 12:31:48,254 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 12:31:48,257 INFO L225 Difference]: With dead ends: 661 [2023-12-02 12:31:48,257 INFO L226 Difference]: Without dead ends: 651 [2023-12-02 12:31:48,258 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 159 GetRequests, 117 SyntacticMatches, 7 SemanticMatches, 35 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 508 ImplicationChecksByTransitivity, 11.8s TimeCoverageRelationStatistics Valid=183, Invalid=1149, Unknown=0, NotChecked=0, Total=1332 [2023-12-02 12:31:48,259 INFO L413 NwaCegarLoop]: 34 mSDtfsCounter, 51 mSDsluCounter, 172 mSDsCounter, 0 mSdLazyCounter, 223 mSolverCounterSat, 21 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 62 SdHoareTripleChecker+Valid, 206 SdHoareTripleChecker+Invalid, 244 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 21 IncrementalHoareTripleChecker+Valid, 223 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2023-12-02 12:31:48,259 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [62 Valid, 206 Invalid, 244 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [21 Valid, 223 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2023-12-02 12:31:48,260 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 651 states. [2023-12-02 12:31:48,394 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 651 to 642. [2023-12-02 12:31:48,395 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 642 states, 418 states have (on average 1.291866028708134) internal successors, (540), 435 states have internal predecessors, (540), 181 states have call successors, (181), 43 states have call predecessors, (181), 42 states have return successors, (177), 163 states have call predecessors, (177), 177 states have call successors, (177) [2023-12-02 12:31:48,399 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 642 states to 642 states and 898 transitions. [2023-12-02 12:31:48,399 INFO L78 Accepts]: Start accepts. Automaton has 642 states and 898 transitions. Word has length 65 [2023-12-02 12:31:48,399 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 12:31:48,399 INFO L495 AbstractCegarLoop]: Abstraction has 642 states and 898 transitions. [2023-12-02 12:31:48,399 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 11 states, 10 states have (on average 2.5) internal successors, (25), 9 states have internal predecessors, (25), 5 states have call successors, (12), 2 states have call predecessors, (12), 3 states have return successors, (11), 4 states have call predecessors, (11), 5 states have call successors, (11) [2023-12-02 12:31:48,399 INFO L276 IsEmpty]: Start isEmpty. Operand 642 states and 898 transitions. [2023-12-02 12:31:48,400 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 72 [2023-12-02 12:31:48,400 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 12:31:48,400 INFO L195 NwaCegarLoop]: trace histogram [9, 8, 8, 4, 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] [2023-12-02 12:31:48,404 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e6365f1c-6e1a-454b-8e39-744a0dfb75e7/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (16)] Ended with exit code 0 [2023-12-02 12:31:48,600 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 16 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e6365f1c-6e1a-454b-8e39-744a0dfb75e7/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable14 [2023-12-02 12:31:48,601 INFO L420 AbstractCegarLoop]: === Iteration 16 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 12:31:48,601 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 12:31:48,601 INFO L85 PathProgramCache]: Analyzing trace with hash 1872706257, now seen corresponding path program 1 times [2023-12-02 12:31:48,601 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 12:31:48,601 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [848805121] [2023-12-02 12:31:48,601 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 12:31:48,601 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 12:31:48,611 ERROR L246 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2023-12-02 12:31:48,611 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [192352327] [2023-12-02 12:31:48,611 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 12:31:48,611 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 12:31:48,612 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e6365f1c-6e1a-454b-8e39-744a0dfb75e7/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 12:31:48,613 INFO L229 MonitoredProcess]: Starting monitored process 17 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e6365f1c-6e1a-454b-8e39-744a0dfb75e7/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 12:31:48,614 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e6365f1c-6e1a-454b-8e39-744a0dfb75e7/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (17)] Waiting until timeout for monitored process [2023-12-02 12:31:48,669 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 12:31:48,671 INFO L262 TraceCheckSpWp]: Trace formula consists of 205 conjuncts, 41 conjunts are in the unsatisfiable core [2023-12-02 12:31:48,673 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 12:31:49,163 INFO L134 CoverageAnalysis]: Checked inductivity of 150 backedges. 16 proven. 13 refuted. 0 times theorem prover too weak. 121 trivial. 0 not checked. [2023-12-02 12:31:49,163 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-12-02 12:31:50,056 INFO L134 CoverageAnalysis]: Checked inductivity of 150 backedges. 16 proven. 10 refuted. 0 times theorem prover too weak. 124 trivial. 0 not checked. [2023-12-02 12:31:50,057 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 12:31:50,057 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [848805121] [2023-12-02 12:31:50,057 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2023-12-02 12:31:50,057 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [192352327] [2023-12-02 12:31:50,057 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [192352327] provided 0 perfect and 2 imperfect interpolant sequences [2023-12-02 12:31:50,057 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [428216972] [2023-12-02 12:31:50,059 INFO L159 IcfgInterpreter]: Started Sifa with 26 locations of interest [2023-12-02 12:31:50,059 INFO L166 IcfgInterpreter]: Building call graph [2023-12-02 12:31:50,059 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-12-02 12:31:50,060 INFO L176 IcfgInterpreter]: Starting interpretation [2023-12-02 12:31:50,060 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-12-02 12:32:02,251 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 1 for LOIs [2023-12-02 12:32:02,254 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 7 for LOIs [2023-12-02 12:32:02,254 INFO L180 IcfgInterpreter]: Interpretation finished [2023-12-02 12:32:06,307 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '12439#(and (= |__VERIFIER_assert_#in~cond| 0) (= __VERIFIER_assert_~cond 0))' at error location [2023-12-02 12:32:06,307 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-12-02 12:32:06,307 INFO L185 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2023-12-02 12:32:06,307 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 10] total 20 [2023-12-02 12:32:06,308 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [86281044] [2023-12-02 12:32:06,308 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2023-12-02 12:32:06,308 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 20 states [2023-12-02 12:32:06,308 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 12:32:06,309 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2023-12-02 12:32:06,309 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=177, Invalid=1383, Unknown=0, NotChecked=0, Total=1560 [2023-12-02 12:32:06,309 INFO L87 Difference]: Start difference. First operand 642 states and 898 transitions. Second operand has 20 states, 17 states have (on average 2.2941176470588234) internal successors, (39), 17 states have internal predecessors, (39), 10 states have call successors, (25), 3 states have call predecessors, (25), 2 states have return successors, (24), 8 states have call predecessors, (24), 8 states have call successors, (24) [2023-12-02 12:32:15,242 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 12:32:15,242 INFO L93 Difference]: Finished difference Result 958 states and 1413 transitions. [2023-12-02 12:32:15,243 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 30 states. [2023-12-02 12:32:15,243 INFO L78 Accepts]: Start accepts. Automaton has has 20 states, 17 states have (on average 2.2941176470588234) internal successors, (39), 17 states have internal predecessors, (39), 10 states have call successors, (25), 3 states have call predecessors, (25), 2 states have return successors, (24), 8 states have call predecessors, (24), 8 states have call successors, (24) Word has length 71 [2023-12-02 12:32:15,243 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 12:32:15,248 INFO L225 Difference]: With dead ends: 958 [2023-12-02 12:32:15,248 INFO L226 Difference]: Without dead ends: 943 [2023-12-02 12:32:15,250 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 234 GetRequests, 173 SyntacticMatches, 0 SemanticMatches, 61 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1096 ImplicationChecksByTransitivity, 10.2s TimeCoverageRelationStatistics Valid=499, Invalid=3407, Unknown=0, NotChecked=0, Total=3906 [2023-12-02 12:32:15,251 INFO L413 NwaCegarLoop]: 56 mSDtfsCounter, 167 mSDsluCounter, 457 mSDsCounter, 0 mSdLazyCounter, 467 mSolverCounterSat, 132 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 3.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 171 SdHoareTripleChecker+Valid, 513 SdHoareTripleChecker+Invalid, 599 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 132 IncrementalHoareTripleChecker+Valid, 467 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 3.2s IncrementalHoareTripleChecker+Time [2023-12-02 12:32:15,251 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [171 Valid, 513 Invalid, 599 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [132 Valid, 467 Invalid, 0 Unknown, 0 Unchecked, 3.2s Time] [2023-12-02 12:32:15,252 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 943 states. [2023-12-02 12:32:15,563 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 943 to 877. [2023-12-02 12:32:15,564 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 877 states, 566 states have (on average 1.342756183745583) internal successors, (760), 585 states have internal predecessors, (760), 267 states have call successors, (267), 43 states have call predecessors, (267), 43 states have return successors, (265), 248 states have call predecessors, (265), 265 states have call successors, (265) [2023-12-02 12:32:15,571 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 877 states to 877 states and 1292 transitions. [2023-12-02 12:32:15,571 INFO L78 Accepts]: Start accepts. Automaton has 877 states and 1292 transitions. Word has length 71 [2023-12-02 12:32:15,572 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 12:32:15,572 INFO L495 AbstractCegarLoop]: Abstraction has 877 states and 1292 transitions. [2023-12-02 12:32:15,572 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 20 states, 17 states have (on average 2.2941176470588234) internal successors, (39), 17 states have internal predecessors, (39), 10 states have call successors, (25), 3 states have call predecessors, (25), 2 states have return successors, (24), 8 states have call predecessors, (24), 8 states have call successors, (24) [2023-12-02 12:32:15,572 INFO L276 IsEmpty]: Start isEmpty. Operand 877 states and 1292 transitions. [2023-12-02 12:32:15,574 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 89 [2023-12-02 12:32:15,574 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 12:32:15,574 INFO L195 NwaCegarLoop]: trace histogram [12, 11, 11, 4, 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] [2023-12-02 12:32:15,580 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e6365f1c-6e1a-454b-8e39-744a0dfb75e7/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (17)] Ended with exit code 0 [2023-12-02 12:32:15,774 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 17 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e6365f1c-6e1a-454b-8e39-744a0dfb75e7/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable15 [2023-12-02 12:32:15,775 INFO L420 AbstractCegarLoop]: === Iteration 17 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 12:32:15,775 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 12:32:15,775 INFO L85 PathProgramCache]: Analyzing trace with hash 951211296, now seen corresponding path program 1 times [2023-12-02 12:32:15,775 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 12:32:15,776 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [983113778] [2023-12-02 12:32:15,776 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 12:32:15,776 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 12:32:15,785 ERROR L246 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2023-12-02 12:32:15,786 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [905653363] [2023-12-02 12:32:15,786 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 12:32:15,786 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 12:32:15,786 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e6365f1c-6e1a-454b-8e39-744a0dfb75e7/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 12:32:15,787 INFO L229 MonitoredProcess]: Starting monitored process 18 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e6365f1c-6e1a-454b-8e39-744a0dfb75e7/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 12:32:15,788 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e6365f1c-6e1a-454b-8e39-744a0dfb75e7/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (18)] Waiting until timeout for monitored process [2023-12-02 12:32:15,862 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 12:32:15,865 INFO L262 TraceCheckSpWp]: Trace formula consists of 240 conjuncts, 48 conjunts are in the unsatisfiable core [2023-12-02 12:32:15,867 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 12:32:16,837 INFO L134 CoverageAnalysis]: Checked inductivity of 276 backedges. 51 proven. 26 refuted. 0 times theorem prover too weak. 199 trivial. 0 not checked. [2023-12-02 12:32:16,838 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-12-02 12:32:18,651 INFO L134 CoverageAnalysis]: Checked inductivity of 276 backedges. 51 proven. 23 refuted. 0 times theorem prover too weak. 202 trivial. 0 not checked. [2023-12-02 12:32:18,652 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 12:32:18,652 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [983113778] [2023-12-02 12:32:18,652 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2023-12-02 12:32:18,652 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [905653363] [2023-12-02 12:32:18,652 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [905653363] provided 0 perfect and 2 imperfect interpolant sequences [2023-12-02 12:32:18,652 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1503128558] [2023-12-02 12:32:18,654 INFO L159 IcfgInterpreter]: Started Sifa with 25 locations of interest [2023-12-02 12:32:18,654 INFO L166 IcfgInterpreter]: Building call graph [2023-12-02 12:32:18,654 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-12-02 12:32:18,654 INFO L176 IcfgInterpreter]: Starting interpretation [2023-12-02 12:32:18,654 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-12-02 12:32:30,935 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 3 for LOIs [2023-12-02 12:32:30,939 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 7 for LOIs [2023-12-02 12:32:30,940 INFO L180 IcfgInterpreter]: Interpretation finished [2023-12-02 12:32:38,263 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '15809#(and (= |__VERIFIER_assert_#in~cond| 0) (= __VERIFIER_assert_~cond 0) (<= ~counter~0 20))' at error location [2023-12-02 12:32:38,263 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-12-02 12:32:38,263 INFO L185 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2023-12-02 12:32:38,263 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 11] total 21 [2023-12-02 12:32:38,263 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1709917124] [2023-12-02 12:32:38,264 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2023-12-02 12:32:38,264 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 21 states [2023-12-02 12:32:38,264 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 12:32:38,265 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2023-12-02 12:32:38,265 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=217, Invalid=1423, Unknown=0, NotChecked=0, Total=1640 [2023-12-02 12:32:38,266 INFO L87 Difference]: Start difference. First operand 877 states and 1292 transitions. Second operand has 21 states, 19 states have (on average 2.526315789473684) internal successors, (48), 18 states have internal predecessors, (48), 11 states have call successors, (31), 3 states have call predecessors, (31), 3 states have return successors, (30), 11 states have call predecessors, (30), 10 states have call successors, (30) [2023-12-02 12:32:51,320 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 12:32:52,708 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.00s for a HTC check with result INVALID. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2023-12-02 12:32:54,774 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.01s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2023-12-02 12:33:09,037 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 12:33:13,397 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 12:33:13,397 INFO L93 Difference]: Finished difference Result 1025 states and 1528 transitions. [2023-12-02 12:33:13,397 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 26 states. [2023-12-02 12:33:13,397 INFO L78 Accepts]: Start accepts. Automaton has has 21 states, 19 states have (on average 2.526315789473684) internal successors, (48), 18 states have internal predecessors, (48), 11 states have call successors, (31), 3 states have call predecessors, (31), 3 states have return successors, (30), 11 states have call predecessors, (30), 10 states have call successors, (30) Word has length 88 [2023-12-02 12:33:13,397 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 12:33:13,402 INFO L225 Difference]: With dead ends: 1025 [2023-12-02 12:33:13,402 INFO L226 Difference]: Without dead ends: 1023 [2023-12-02 12:33:13,404 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 280 GetRequests, 223 SyntacticMatches, 0 SemanticMatches, 57 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1036 ImplicationChecksByTransitivity, 31.3s TimeCoverageRelationStatistics Valid=517, Invalid=2904, Unknown=1, NotChecked=0, Total=3422 [2023-12-02 12:33:13,404 INFO L413 NwaCegarLoop]: 38 mSDtfsCounter, 141 mSDsluCounter, 429 mSDsCounter, 0 mSdLazyCounter, 413 mSolverCounterSat, 104 mSolverCounterUnsat, 3 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 11.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 150 SdHoareTripleChecker+Valid, 467 SdHoareTripleChecker+Invalid, 520 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 104 IncrementalHoareTripleChecker+Valid, 413 IncrementalHoareTripleChecker+Invalid, 3 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 11.4s IncrementalHoareTripleChecker+Time [2023-12-02 12:33:13,405 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [150 Valid, 467 Invalid, 520 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [104 Valid, 413 Invalid, 3 Unknown, 0 Unchecked, 11.4s Time] [2023-12-02 12:33:13,406 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1023 states. [2023-12-02 12:33:13,825 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1023 to 981. [2023-12-02 12:33:13,827 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 981 states, 629 states have (on average 1.354531001589825) internal successors, (852), 651 states have internal predecessors, (852), 307 states have call successors, (307), 44 states have call predecessors, (307), 44 states have return successors, (305), 285 states have call predecessors, (305), 305 states have call successors, (305) [2023-12-02 12:33:13,832 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 981 states to 981 states and 1464 transitions. [2023-12-02 12:33:13,832 INFO L78 Accepts]: Start accepts. Automaton has 981 states and 1464 transitions. Word has length 88 [2023-12-02 12:33:13,832 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 12:33:13,832 INFO L495 AbstractCegarLoop]: Abstraction has 981 states and 1464 transitions. [2023-12-02 12:33:13,832 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 21 states, 19 states have (on average 2.526315789473684) internal successors, (48), 18 states have internal predecessors, (48), 11 states have call successors, (31), 3 states have call predecessors, (31), 3 states have return successors, (30), 11 states have call predecessors, (30), 10 states have call successors, (30) [2023-12-02 12:33:13,832 INFO L276 IsEmpty]: Start isEmpty. Operand 981 states and 1464 transitions. [2023-12-02 12:33:13,833 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 93 [2023-12-02 12:33:13,834 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 12:33:13,834 INFO L195 NwaCegarLoop]: trace histogram [12, 11, 11, 4, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-12-02 12:33:13,839 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e6365f1c-6e1a-454b-8e39-744a0dfb75e7/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (18)] Ended with exit code 0 [2023-12-02 12:33:14,034 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable16,18 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e6365f1c-6e1a-454b-8e39-744a0dfb75e7/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 12:33:14,034 INFO L420 AbstractCegarLoop]: === Iteration 18 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 12:33:14,035 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 12:33:14,035 INFO L85 PathProgramCache]: Analyzing trace with hash 1729594626, now seen corresponding path program 4 times [2023-12-02 12:33:14,035 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 12:33:14,035 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2121453993] [2023-12-02 12:33:14,035 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 12:33:14,035 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 12:33:14,044 ERROR L246 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2023-12-02 12:33:14,045 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1966746707] [2023-12-02 12:33:14,045 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2023-12-02 12:33:14,045 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 12:33:14,045 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e6365f1c-6e1a-454b-8e39-744a0dfb75e7/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 12:33:14,046 INFO L229 MonitoredProcess]: Starting monitored process 19 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e6365f1c-6e1a-454b-8e39-744a0dfb75e7/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 12:33:14,053 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e6365f1c-6e1a-454b-8e39-744a0dfb75e7/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (19)] Waiting until timeout for monitored process [2023-12-02 12:33:14,109 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 12:33:14,110 INFO L262 TraceCheckSpWp]: Trace formula consists of 258 conjuncts, 5 conjunts are in the unsatisfiable core [2023-12-02 12:33:14,112 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 12:33:14,136 INFO L134 CoverageAnalysis]: Checked inductivity of 283 backedges. 141 proven. 0 refuted. 0 times theorem prover too weak. 142 trivial. 0 not checked. [2023-12-02 12:33:14,136 INFO L323 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2023-12-02 12:33:14,136 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 12:33:14,137 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2121453993] [2023-12-02 12:33:14,137 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2023-12-02 12:33:14,137 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1966746707] [2023-12-02 12:33:14,137 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1966746707] provided 1 perfect and 0 imperfect interpolant sequences [2023-12-02 12:33:14,137 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-12-02 12:33:14,137 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2023-12-02 12:33:14,137 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1736465116] [2023-12-02 12:33:14,137 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-12-02 12:33:14,137 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2023-12-02 12:33:14,138 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 12:33:14,138 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2023-12-02 12:33:14,138 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2023-12-02 12:33:14,138 INFO L87 Difference]: Start difference. First operand 981 states and 1464 transitions. Second operand has 5 states, 5 states have (on average 6.0) internal successors, (30), 5 states have internal predecessors, (30), 3 states have call successors, (16), 2 states have call predecessors, (16), 2 states have return successors, (15), 3 states have call predecessors, (15), 3 states have call successors, (15) [2023-12-02 12:33:14,617 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 12:33:14,617 INFO L93 Difference]: Finished difference Result 1605 states and 2474 transitions. [2023-12-02 12:33:14,617 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2023-12-02 12:33:14,617 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 6.0) internal successors, (30), 5 states have internal predecessors, (30), 3 states have call successors, (16), 2 states have call predecessors, (16), 2 states have return successors, (15), 3 states have call predecessors, (15), 3 states have call successors, (15) Word has length 92 [2023-12-02 12:33:14,618 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 12:33:14,623 INFO L225 Difference]: With dead ends: 1605 [2023-12-02 12:33:14,623 INFO L226 Difference]: Without dead ends: 944 [2023-12-02 12:33:14,625 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 94 GetRequests, 89 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 12:33:14,626 INFO L413 NwaCegarLoop]: 49 mSDtfsCounter, 13 mSDsluCounter, 116 mSDsCounter, 0 mSdLazyCounter, 50 mSolverCounterSat, 4 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 17 SdHoareTripleChecker+Valid, 165 SdHoareTripleChecker+Invalid, 54 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 4 IncrementalHoareTripleChecker+Valid, 50 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2023-12-02 12:33:14,626 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [17 Valid, 165 Invalid, 54 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [4 Valid, 50 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2023-12-02 12:33:14,627 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 944 states. [2023-12-02 12:33:14,981 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 944 to 789. [2023-12-02 12:33:14,983 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 789 states, 497 states have (on average 1.3199195171026157) internal successors, (656), 508 states have internal predecessors, (656), 247 states have call successors, (247), 44 states have call predecessors, (247), 44 states have return successors, (245), 236 states have call predecessors, (245), 245 states have call successors, (245) [2023-12-02 12:33:14,987 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 789 states to 789 states and 1148 transitions. [2023-12-02 12:33:14,988 INFO L78 Accepts]: Start accepts. Automaton has 789 states and 1148 transitions. Word has length 92 [2023-12-02 12:33:14,988 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 12:33:14,988 INFO L495 AbstractCegarLoop]: Abstraction has 789 states and 1148 transitions. [2023-12-02 12:33:14,989 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 6.0) internal successors, (30), 5 states have internal predecessors, (30), 3 states have call successors, (16), 2 states have call predecessors, (16), 2 states have return successors, (15), 3 states have call predecessors, (15), 3 states have call successors, (15) [2023-12-02 12:33:14,989 INFO L276 IsEmpty]: Start isEmpty. Operand 789 states and 1148 transitions. [2023-12-02 12:33:14,990 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 104 [2023-12-02 12:33:14,990 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 12:33:14,990 INFO L195 NwaCegarLoop]: trace histogram [13, 12, 12, 4, 4, 4, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-12-02 12:33:14,995 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e6365f1c-6e1a-454b-8e39-744a0dfb75e7/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (19)] Ended with exit code 0 [2023-12-02 12:33:15,191 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 19 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e6365f1c-6e1a-454b-8e39-744a0dfb75e7/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable17 [2023-12-02 12:33:15,191 INFO L420 AbstractCegarLoop]: === Iteration 19 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 12:33:15,191 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 12:33:15,191 INFO L85 PathProgramCache]: Analyzing trace with hash 1306465918, now seen corresponding path program 1 times [2023-12-02 12:33:15,192 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 12:33:15,192 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2130396266] [2023-12-02 12:33:15,192 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 12:33:15,192 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 12:33:15,200 ERROR L246 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2023-12-02 12:33:15,200 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [988478] [2023-12-02 12:33:15,200 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 12:33:15,201 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 12:33:15,201 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e6365f1c-6e1a-454b-8e39-744a0dfb75e7/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 12:33:15,202 INFO L229 MonitoredProcess]: Starting monitored process 20 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e6365f1c-6e1a-454b-8e39-744a0dfb75e7/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 12:33:15,205 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e6365f1c-6e1a-454b-8e39-744a0dfb75e7/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (20)] Waiting until timeout for monitored process [2023-12-02 12:33:15,285 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 12:33:15,287 INFO L262 TraceCheckSpWp]: Trace formula consists of 294 conjuncts, 15 conjunts are in the unsatisfiable core [2023-12-02 12:33:15,290 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 12:33:15,407 INFO L134 CoverageAnalysis]: Checked inductivity of 345 backedges. 32 proven. 229 refuted. 0 times theorem prover too weak. 84 trivial. 0 not checked. [2023-12-02 12:33:15,407 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-12-02 12:33:15,528 INFO L134 CoverageAnalysis]: Checked inductivity of 345 backedges. 32 proven. 37 refuted. 0 times theorem prover too weak. 276 trivial. 0 not checked. [2023-12-02 12:33:15,528 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 12:33:15,528 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2130396266] [2023-12-02 12:33:15,528 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2023-12-02 12:33:15,528 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [988478] [2023-12-02 12:33:15,528 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [988478] provided 0 perfect and 2 imperfect interpolant sequences [2023-12-02 12:33:15,529 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [45037203] [2023-12-02 12:33:15,530 INFO L159 IcfgInterpreter]: Started Sifa with 26 locations of interest [2023-12-02 12:33:15,530 INFO L166 IcfgInterpreter]: Building call graph [2023-12-02 12:33:15,531 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-12-02 12:33:15,531 INFO L176 IcfgInterpreter]: Starting interpretation [2023-12-02 12:33:15,531 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-12-02 12:33:26,898 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 1 for LOIs [2023-12-02 12:33:26,901 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 7 for LOIs [2023-12-02 12:33:26,903 INFO L180 IcfgInterpreter]: Interpretation finished [2023-12-02 12:33:28,702 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '23453#(and (= |__VERIFIER_assert_#in~cond| 0) (= __VERIFIER_assert_~cond 0))' at error location [2023-12-02 12:33:28,702 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-12-02 12:33:28,702 INFO L185 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2023-12-02 12:33:28,702 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 10] total 18 [2023-12-02 12:33:28,703 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2069077383] [2023-12-02 12:33:28,703 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2023-12-02 12:33:28,703 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 18 states [2023-12-02 12:33:28,703 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 12:33:28,704 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2023-12-02 12:33:28,705 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=297, Invalid=963, Unknown=0, NotChecked=0, Total=1260 [2023-12-02 12:33:28,705 INFO L87 Difference]: Start difference. First operand 789 states and 1148 transitions. Second operand has 18 states, 18 states have (on average 3.7777777777777777) internal successors, (68), 18 states have internal predecessors, (68), 9 states have call successors, (33), 6 states have call predecessors, (33), 5 states have return successors, (32), 8 states have call predecessors, (32), 8 states have call successors, (32) [2023-12-02 12:33:30,345 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 12:33:30,345 INFO L93 Difference]: Finished difference Result 2586 states and 3710 transitions. [2023-12-02 12:33:30,346 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 29 states. [2023-12-02 12:33:30,346 INFO L78 Accepts]: Start accepts. Automaton has has 18 states, 18 states have (on average 3.7777777777777777) internal successors, (68), 18 states have internal predecessors, (68), 9 states have call successors, (33), 6 states have call predecessors, (33), 5 states have return successors, (32), 8 states have call predecessors, (32), 8 states have call successors, (32) Word has length 103 [2023-12-02 12:33:30,346 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 12:33:30,359 INFO L225 Difference]: With dead ends: 2586 [2023-12-02 12:33:30,359 INFO L226 Difference]: Without dead ends: 2074 [2023-12-02 12:33:30,363 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 319 GetRequests, 273 SyntacticMatches, 0 SemanticMatches, 46 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 756 ImplicationChecksByTransitivity, 2.1s TimeCoverageRelationStatistics Valid=483, Invalid=1773, Unknown=0, NotChecked=0, Total=2256 [2023-12-02 12:33:30,363 INFO L413 NwaCegarLoop]: 33 mSDtfsCounter, 240 mSDsluCounter, 200 mSDsCounter, 0 mSdLazyCounter, 156 mSolverCounterSat, 70 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 240 SdHoareTripleChecker+Valid, 233 SdHoareTripleChecker+Invalid, 226 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 70 IncrementalHoareTripleChecker+Valid, 156 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2023-12-02 12:33:30,364 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [240 Valid, 233 Invalid, 226 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [70 Valid, 156 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2023-12-02 12:33:30,366 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2074 states. [2023-12-02 12:33:31,531 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2074 to 2048. [2023-12-02 12:33:31,534 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2048 states, 1277 states have (on average 1.2239624119028973) internal successors, (1563), 1298 states have internal predecessors, (1563), 610 states have call successors, (610), 160 states have call predecessors, (610), 160 states have return successors, (601), 589 states have call predecessors, (601), 601 states have call successors, (601) [2023-12-02 12:33:31,542 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2048 states to 2048 states and 2774 transitions. [2023-12-02 12:33:31,543 INFO L78 Accepts]: Start accepts. Automaton has 2048 states and 2774 transitions. Word has length 103 [2023-12-02 12:33:31,543 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 12:33:31,543 INFO L495 AbstractCegarLoop]: Abstraction has 2048 states and 2774 transitions. [2023-12-02 12:33:31,543 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 18 states, 18 states have (on average 3.7777777777777777) internal successors, (68), 18 states have internal predecessors, (68), 9 states have call successors, (33), 6 states have call predecessors, (33), 5 states have return successors, (32), 8 states have call predecessors, (32), 8 states have call successors, (32) [2023-12-02 12:33:31,543 INFO L276 IsEmpty]: Start isEmpty. Operand 2048 states and 2774 transitions. [2023-12-02 12:33:31,545 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 111 [2023-12-02 12:33:31,545 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 12:33:31,545 INFO L195 NwaCegarLoop]: trace histogram [15, 14, 14, 4, 4, 4, 4, 4, 4, 4, 4, 3, 3, 3, 3, 3, 3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-12-02 12:33:31,551 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e6365f1c-6e1a-454b-8e39-744a0dfb75e7/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (20)] Forceful destruction successful, exit code 0 [2023-12-02 12:33:31,746 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable18,20 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e6365f1c-6e1a-454b-8e39-744a0dfb75e7/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 12:33:31,746 INFO L420 AbstractCegarLoop]: === Iteration 20 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 12:33:31,746 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 12:33:31,746 INFO L85 PathProgramCache]: Analyzing trace with hash -186342166, now seen corresponding path program 2 times [2023-12-02 12:33:31,746 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 12:33:31,746 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [426131567] [2023-12-02 12:33:31,747 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 12:33:31,747 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 12:33:31,755 ERROR L246 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2023-12-02 12:33:31,755 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1665831663] [2023-12-02 12:33:31,755 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2023-12-02 12:33:31,755 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 12:33:31,756 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e6365f1c-6e1a-454b-8e39-744a0dfb75e7/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 12:33:31,756 INFO L229 MonitoredProcess]: Starting monitored process 21 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e6365f1c-6e1a-454b-8e39-744a0dfb75e7/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 12:33:31,757 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e6365f1c-6e1a-454b-8e39-744a0dfb75e7/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (21)] Waiting until timeout for monitored process [2023-12-02 12:33:31,849 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2023-12-02 12:33:31,849 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-12-02 12:33:31,851 INFO L262 TraceCheckSpWp]: Trace formula consists of 250 conjuncts, 63 conjunts are in the unsatisfiable core [2023-12-02 12:33:31,854 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 12:33:32,919 INFO L134 CoverageAnalysis]: Checked inductivity of 450 backedges. 36 proven. 80 refuted. 0 times theorem prover too weak. 334 trivial. 0 not checked. [2023-12-02 12:33:32,919 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-12-02 12:33:34,953 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 12:33:34,953 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [426131567] [2023-12-02 12:33:34,954 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2023-12-02 12:33:34,954 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1665831663] [2023-12-02 12:33:34,954 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1665831663] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 12:33:34,954 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [427054637] [2023-12-02 12:33:34,955 INFO L159 IcfgInterpreter]: Started Sifa with 25 locations of interest [2023-12-02 12:33:34,955 INFO L166 IcfgInterpreter]: Building call graph [2023-12-02 12:33:34,956 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-12-02 12:33:34,956 INFO L176 IcfgInterpreter]: Starting interpretation [2023-12-02 12:33:34,956 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-12-02 12:33:47,271 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 3 for LOIs [2023-12-02 12:33:47,274 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 7 for LOIs [2023-12-02 12:33:47,275 INFO L180 IcfgInterpreter]: Interpretation finished [2023-12-02 12:33:56,570 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '31020#(and (= |__VERIFIER_assert_#in~cond| 0) (= __VERIFIER_assert_~cond 0) (<= ~counter~0 20))' at error location [2023-12-02 12:33:56,570 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-12-02 12:33:56,570 INFO L185 FreeRefinementEngine]: Found 0 perfect and 1 imperfect interpolant sequences. [2023-12-02 12:33:56,570 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [18] total 18 [2023-12-02 12:33:56,570 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [38633991] [2023-12-02 12:33:56,571 INFO L85 oduleStraightlineAll]: Using 1 imperfect interpolants to construct interpolant automaton [2023-12-02 12:33:56,571 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 18 states [2023-12-02 12:33:56,571 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 12:33:56,572 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2023-12-02 12:33:56,573 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=261, Invalid=1901, Unknown=0, NotChecked=0, Total=2162 [2023-12-02 12:33:56,573 INFO L87 Difference]: Start difference. First operand 2048 states and 2774 transitions. Second operand has 18 states, 16 states have (on average 2.1875) internal successors, (35), 15 states have internal predecessors, (35), 7 states have call successors, (19), 2 states have call predecessors, (19), 3 states have return successors, (18), 7 states have call predecessors, (18), 7 states have call successors, (18) [2023-12-02 12:33:58,529 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 12:33:58,529 INFO L93 Difference]: Finished difference Result 2190 states and 2926 transitions. [2023-12-02 12:33:58,529 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2023-12-02 12:33:58,530 INFO L78 Accepts]: Start accepts. Automaton has has 18 states, 16 states have (on average 2.1875) internal successors, (35), 15 states have internal predecessors, (35), 7 states have call successors, (19), 2 states have call predecessors, (19), 3 states have return successors, (18), 7 states have call predecessors, (18), 7 states have call successors, (18) Word has length 110 [2023-12-02 12:33:58,530 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 12:33:58,539 INFO L225 Difference]: With dead ends: 2190 [2023-12-02 12:33:58,539 INFO L226 Difference]: Without dead ends: 2186 [2023-12-02 12:33:58,541 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 298 GetRequests, 246 SyntacticMatches, 0 SemanticMatches, 52 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 888 ImplicationChecksByTransitivity, 11.6s TimeCoverageRelationStatistics Valid=358, Invalid=2504, Unknown=0, NotChecked=0, Total=2862 [2023-12-02 12:33:58,541 INFO L413 NwaCegarLoop]: 44 mSDtfsCounter, 70 mSDsluCounter, 341 mSDsCounter, 0 mSdLazyCounter, 546 mSolverCounterSat, 37 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 85 SdHoareTripleChecker+Valid, 385 SdHoareTripleChecker+Invalid, 583 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 37 IncrementalHoareTripleChecker+Valid, 546 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.6s IncrementalHoareTripleChecker+Time [2023-12-02 12:33:58,542 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [85 Valid, 385 Invalid, 583 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [37 Valid, 546 Invalid, 0 Unknown, 0 Unchecked, 0.6s Time] [2023-12-02 12:33:58,544 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2186 states. [2023-12-02 12:33:59,734 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2186 to 2178. [2023-12-02 12:33:59,738 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2178 states, 1362 states have (on average 1.2151248164464024) internal successors, (1655), 1382 states have internal predecessors, (1655), 634 states have call successors, (634), 182 states have call predecessors, (634), 181 states have return successors, (625), 613 states have call predecessors, (625), 625 states have call successors, (625) [2023-12-02 12:33:59,746 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2178 states to 2178 states and 2914 transitions. [2023-12-02 12:33:59,746 INFO L78 Accepts]: Start accepts. Automaton has 2178 states and 2914 transitions. Word has length 110 [2023-12-02 12:33:59,746 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 12:33:59,746 INFO L495 AbstractCegarLoop]: Abstraction has 2178 states and 2914 transitions. [2023-12-02 12:33:59,746 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 18 states, 16 states have (on average 2.1875) internal successors, (35), 15 states have internal predecessors, (35), 7 states have call successors, (19), 2 states have call predecessors, (19), 3 states have return successors, (18), 7 states have call predecessors, (18), 7 states have call successors, (18) [2023-12-02 12:33:59,747 INFO L276 IsEmpty]: Start isEmpty. Operand 2178 states and 2914 transitions. [2023-12-02 12:33:59,748 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 121 [2023-12-02 12:33:59,748 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 12:33:59,748 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-12-02 12:33:59,754 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e6365f1c-6e1a-454b-8e39-744a0dfb75e7/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (21)] Ended with exit code 0 [2023-12-02 12:33:59,948 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable19,21 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e6365f1c-6e1a-454b-8e39-744a0dfb75e7/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 12:33:59,949 INFO L420 AbstractCegarLoop]: === Iteration 21 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 12:33:59,949 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 12:33:59,949 INFO L85 PathProgramCache]: Analyzing trace with hash -634736719, now seen corresponding path program 1 times [2023-12-02 12:33:59,949 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 12:33:59,949 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [524784982] [2023-12-02 12:33:59,949 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 12:33:59,949 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 12:33:59,958 ERROR L246 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2023-12-02 12:33:59,958 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [163200532] [2023-12-02 12:33:59,958 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 12:33:59,958 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 12:33:59,958 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e6365f1c-6e1a-454b-8e39-744a0dfb75e7/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 12:33:59,959 INFO L229 MonitoredProcess]: Starting monitored process 22 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e6365f1c-6e1a-454b-8e39-744a0dfb75e7/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 12:33:59,960 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e6365f1c-6e1a-454b-8e39-744a0dfb75e7/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (22)] Waiting until timeout for monitored process [2023-12-02 12:34:00,026 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 12:34:00,027 INFO L262 TraceCheckSpWp]: Trace formula consists of 313 conjuncts, 15 conjunts are in the unsatisfiable core [2023-12-02 12:34:00,030 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 12:34:00,158 INFO L134 CoverageAnalysis]: Checked inductivity of 574 backedges. 32 proven. 434 refuted. 0 times theorem prover too weak. 108 trivial. 0 not checked. [2023-12-02 12:34:00,158 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-12-02 12:34:00,289 INFO L134 CoverageAnalysis]: Checked inductivity of 574 backedges. 32 proven. 50 refuted. 0 times theorem prover too weak. 492 trivial. 0 not checked. [2023-12-02 12:34:00,289 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 12:34:00,290 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [524784982] [2023-12-02 12:34:00,290 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2023-12-02 12:34:00,290 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [163200532] [2023-12-02 12:34:00,290 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [163200532] provided 0 perfect and 2 imperfect interpolant sequences [2023-12-02 12:34:00,290 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [141582729] [2023-12-02 12:34:00,291 INFO L159 IcfgInterpreter]: Started Sifa with 26 locations of interest [2023-12-02 12:34:00,291 INFO L166 IcfgInterpreter]: Building call graph [2023-12-02 12:34:00,292 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-12-02 12:34:00,292 INFO L176 IcfgInterpreter]: Starting interpretation [2023-12-02 12:34:00,292 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-12-02 12:34:12,855 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 1 for LOIs [2023-12-02 12:34:12,858 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 7 for LOIs [2023-12-02 12:34:12,859 INFO L180 IcfgInterpreter]: Interpretation finished [2023-12-02 12:34:17,476 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '38296#(and (= |__VERIFIER_assert_#in~cond| 0) (= __VERIFIER_assert_~cond 0))' at error location [2023-12-02 12:34:17,477 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-12-02 12:34:17,477 INFO L185 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2023-12-02 12:34:17,477 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 10] total 18 [2023-12-02 12:34:17,477 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [284688646] [2023-12-02 12:34:17,477 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2023-12-02 12:34:17,478 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 18 states [2023-12-02 12:34:17,478 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 12:34:17,478 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2023-12-02 12:34:17,479 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=306, Invalid=1026, Unknown=0, NotChecked=0, Total=1332 [2023-12-02 12:34:17,479 INFO L87 Difference]: Start difference. First operand 2178 states and 2914 transitions. Second operand has 18 states, 18 states have (on average 3.7777777777777777) internal successors, (68), 18 states have internal predecessors, (68), 11 states have call successors, (41), 7 states have call predecessors, (41), 6 states have return successors, (40), 10 states have call predecessors, (40), 10 states have call successors, (40) [2023-12-02 12:34:19,071 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 12:34:19,071 INFO L93 Difference]: Finished difference Result 2250 states and 2984 transitions. [2023-12-02 12:34:19,071 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 29 states. [2023-12-02 12:34:19,071 INFO L78 Accepts]: Start accepts. Automaton has has 18 states, 18 states have (on average 3.7777777777777777) internal successors, (68), 18 states have internal predecessors, (68), 11 states have call successors, (41), 7 states have call predecessors, (41), 6 states have return successors, (40), 10 states have call predecessors, (40), 10 states have call successors, (40) Word has length 120 [2023-12-02 12:34:19,072 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 12:34:19,085 INFO L225 Difference]: With dead ends: 2250 [2023-12-02 12:34:19,085 INFO L226 Difference]: Without dead ends: 2210 [2023-12-02 12:34:19,087 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 370 GetRequests, 323 SyntacticMatches, 0 SemanticMatches, 47 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 841 ImplicationChecksByTransitivity, 4.8s TimeCoverageRelationStatistics Valid=493, Invalid=1859, Unknown=0, NotChecked=0, Total=2352 [2023-12-02 12:34:19,088 INFO L413 NwaCegarLoop]: 33 mSDtfsCounter, 194 mSDsluCounter, 228 mSDsCounter, 0 mSdLazyCounter, 173 mSolverCounterSat, 44 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 194 SdHoareTripleChecker+Valid, 261 SdHoareTripleChecker+Invalid, 217 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 44 IncrementalHoareTripleChecker+Valid, 173 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2023-12-02 12:34:19,089 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [194 Valid, 261 Invalid, 217 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [44 Valid, 173 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2023-12-02 12:34:19,092 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2210 states. [2023-12-02 12:34:20,177 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2210 to 2196. [2023-12-02 12:34:20,181 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2196 states, 1380 states have (on average 1.1855072463768115) internal successors, (1636), 1400 states have internal predecessors, (1636), 634 states have call successors, (634), 182 states have call predecessors, (634), 181 states have return successors, (625), 613 states have call predecessors, (625), 625 states have call successors, (625) [2023-12-02 12:34:20,187 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2196 states to 2196 states and 2895 transitions. [2023-12-02 12:34:20,187 INFO L78 Accepts]: Start accepts. Automaton has 2196 states and 2895 transitions. Word has length 120 [2023-12-02 12:34:20,187 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 12:34:20,187 INFO L495 AbstractCegarLoop]: Abstraction has 2196 states and 2895 transitions. [2023-12-02 12:34:20,187 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 18 states, 18 states have (on average 3.7777777777777777) internal successors, (68), 18 states have internal predecessors, (68), 11 states have call successors, (41), 7 states have call predecessors, (41), 6 states have return successors, (40), 10 states have call predecessors, (40), 10 states have call successors, (40) [2023-12-02 12:34:20,188 INFO L276 IsEmpty]: Start isEmpty. Operand 2196 states and 2895 transitions. [2023-12-02 12:34:20,189 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 122 [2023-12-02 12:34:20,189 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 12:34:20,189 INFO L195 NwaCegarLoop]: trace histogram [17, 16, 16, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 3, 3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-12-02 12:34:20,193 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e6365f1c-6e1a-454b-8e39-744a0dfb75e7/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (22)] Ended with exit code 0 [2023-12-02 12:34:20,389 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 22 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e6365f1c-6e1a-454b-8e39-744a0dfb75e7/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable20 [2023-12-02 12:34:20,389 INFO L420 AbstractCegarLoop]: === Iteration 22 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 12:34:20,389 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 12:34:20,390 INFO L85 PathProgramCache]: Analyzing trace with hash 1791411503, now seen corresponding path program 2 times [2023-12-02 12:34:20,390 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 12:34:20,390 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [700591023] [2023-12-02 12:34:20,390 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 12:34:20,390 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 12:34:20,398 ERROR L246 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2023-12-02 12:34:20,398 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1055166054] [2023-12-02 12:34:20,398 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2023-12-02 12:34:20,398 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 12:34:20,398 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e6365f1c-6e1a-454b-8e39-744a0dfb75e7/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 12:34:20,399 INFO L229 MonitoredProcess]: Starting monitored process 23 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e6365f1c-6e1a-454b-8e39-744a0dfb75e7/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 12:34:20,400 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e6365f1c-6e1a-454b-8e39-744a0dfb75e7/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (23)] Waiting until timeout for monitored process [2023-12-02 12:34:20,472 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2023-12-02 12:34:20,473 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-12-02 12:34:20,474 INFO L262 TraceCheckSpWp]: Trace formula consists of 243 conjuncts, 61 conjunts are in the unsatisfiable core [2023-12-02 12:34:20,478 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 12:34:21,272 INFO L134 CoverageAnalysis]: Checked inductivity of 576 backedges. 35 proven. 52 refuted. 0 times theorem prover too weak. 489 trivial. 0 not checked. [2023-12-02 12:34:21,273 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-12-02 12:34:23,061 INFO L134 CoverageAnalysis]: Checked inductivity of 576 backedges. 32 proven. 52 refuted. 0 times theorem prover too weak. 492 trivial. 0 not checked. [2023-12-02 12:34:23,061 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 12:34:23,062 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [700591023] [2023-12-02 12:34:23,062 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2023-12-02 12:34:23,062 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1055166054] [2023-12-02 12:34:23,062 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1055166054] provided 0 perfect and 2 imperfect interpolant sequences [2023-12-02 12:34:23,062 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1379560087] [2023-12-02 12:34:23,063 INFO L159 IcfgInterpreter]: Started Sifa with 26 locations of interest [2023-12-02 12:34:23,063 INFO L166 IcfgInterpreter]: Building call graph [2023-12-02 12:34:23,064 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-12-02 12:34:23,064 INFO L176 IcfgInterpreter]: Starting interpretation [2023-12-02 12:34:23,064 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-12-02 12:34:35,037 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 1 for LOIs [2023-12-02 12:34:35,040 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 7 for LOIs [2023-12-02 12:34:35,041 INFO L180 IcfgInterpreter]: Interpretation finished [2023-12-02 12:34:44,004 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '45701#(and (= |__VERIFIER_assert_#in~cond| 0) (= __VERIFIER_assert_~cond 0))' at error location [2023-12-02 12:34:44,004 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-12-02 12:34:44,004 INFO L185 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2023-12-02 12:34:44,004 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 13] total 26 [2023-12-02 12:34:44,004 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1845448988] [2023-12-02 12:34:44,005 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2023-12-02 12:34:44,005 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 26 states [2023-12-02 12:34:44,005 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 12:34:44,006 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2023-12-02 12:34:44,007 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=221, Invalid=1849, Unknown=0, NotChecked=0, Total=2070 [2023-12-02 12:34:44,007 INFO L87 Difference]: Start difference. First operand 2196 states and 2895 transitions. Second operand has 26 states, 23 states have (on average 2.5652173913043477) internal successors, (59), 24 states have internal predecessors, (59), 13 states have call successors, (40), 3 states have call predecessors, (40), 2 states have return successors, (38), 11 states have call predecessors, (38), 11 states have call successors, (38) [2023-12-02 12:35:08,362 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 12:35:08,362 INFO L93 Difference]: Finished difference Result 2725 states and 3684 transitions. [2023-12-02 12:35:08,362 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 62 states. [2023-12-02 12:35:08,363 INFO L78 Accepts]: Start accepts. Automaton has has 26 states, 23 states have (on average 2.5652173913043477) internal successors, (59), 24 states have internal predecessors, (59), 13 states have call successors, (40), 3 states have call predecessors, (40), 2 states have return successors, (38), 11 states have call predecessors, (38), 11 states have call successors, (38) Word has length 121 [2023-12-02 12:35:08,363 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 12:35:08,377 INFO L225 Difference]: With dead ends: 2725 [2023-12-02 12:35:08,378 INFO L226 Difference]: Without dead ends: 2694 [2023-12-02 12:35:08,383 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 415 GetRequests, 317 SyntacticMatches, 0 SemanticMatches, 98 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2907 ImplicationChecksByTransitivity, 24.7s TimeCoverageRelationStatistics Valid=1308, Invalid=8592, Unknown=0, NotChecked=0, Total=9900 [2023-12-02 12:35:08,383 INFO L413 NwaCegarLoop]: 88 mSDtfsCounter, 312 mSDsluCounter, 1014 mSDsCounter, 0 mSdLazyCounter, 958 mSolverCounterSat, 316 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 8.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 324 SdHoareTripleChecker+Valid, 1102 SdHoareTripleChecker+Invalid, 1274 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 316 IncrementalHoareTripleChecker+Valid, 958 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 8.2s IncrementalHoareTripleChecker+Time [2023-12-02 12:35:08,384 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [324 Valid, 1102 Invalid, 1274 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [316 Valid, 958 Invalid, 0 Unknown, 0 Unchecked, 8.2s Time] [2023-12-02 12:35:08,387 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2694 states. [2023-12-02 12:35:09,830 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2694 to 2360. [2023-12-02 12:35:09,834 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2360 states, 1485 states have (on average 1.1919191919191918) internal successors, (1770), 1505 states have internal predecessors, (1770), 682 states have call successors, (682), 193 states have call predecessors, (682), 192 states have return successors, (673), 661 states have call predecessors, (673), 673 states have call successors, (673) [2023-12-02 12:35:09,843 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2360 states to 2360 states and 3125 transitions. [2023-12-02 12:35:09,843 INFO L78 Accepts]: Start accepts. Automaton has 2360 states and 3125 transitions. Word has length 121 [2023-12-02 12:35:09,843 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 12:35:09,843 INFO L495 AbstractCegarLoop]: Abstraction has 2360 states and 3125 transitions. [2023-12-02 12:35:09,844 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 26 states, 23 states have (on average 2.5652173913043477) internal successors, (59), 24 states have internal predecessors, (59), 13 states have call successors, (40), 3 states have call predecessors, (40), 2 states have return successors, (38), 11 states have call predecessors, (38), 11 states have call successors, (38) [2023-12-02 12:35:09,844 INFO L276 IsEmpty]: Start isEmpty. Operand 2360 states and 3125 transitions. [2023-12-02 12:35:09,846 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 134 [2023-12-02 12:35:09,846 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 12:35:09,846 INFO L195 NwaCegarLoop]: trace histogram [19, 18, 18, 5, 5, 5, 5, 5, 5, 5, 4, 4, 4, 4, 3, 3, 3, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-12-02 12:35:09,851 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e6365f1c-6e1a-454b-8e39-744a0dfb75e7/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (23)] Ended with exit code 0 [2023-12-02 12:35:10,046 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 23 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e6365f1c-6e1a-454b-8e39-744a0dfb75e7/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable21 [2023-12-02 12:35:10,047 INFO L420 AbstractCegarLoop]: === Iteration 23 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 12:35:10,047 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 12:35:10,047 INFO L85 PathProgramCache]: Analyzing trace with hash 1226352354, now seen corresponding path program 3 times [2023-12-02 12:35:10,048 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 12:35:10,048 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [358201533] [2023-12-02 12:35:10,048 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 12:35:10,048 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 12:35:10,058 ERROR L246 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2023-12-02 12:35:10,058 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1462263053] [2023-12-02 12:35:10,058 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2023-12-02 12:35:10,058 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 12:35:10,058 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e6365f1c-6e1a-454b-8e39-744a0dfb75e7/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 12:35:10,059 INFO L229 MonitoredProcess]: Starting monitored process 24 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e6365f1c-6e1a-454b-8e39-744a0dfb75e7/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 12:35:10,060 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e6365f1c-6e1a-454b-8e39-744a0dfb75e7/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (24)] Waiting until timeout for monitored process [2023-12-02 12:35:10,142 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2023-12-02 12:35:10,142 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-12-02 12:35:10,144 INFO L262 TraceCheckSpWp]: Trace formula consists of 300 conjuncts, 59 conjunts are in the unsatisfiable core [2023-12-02 12:35:10,148 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 12:35:11,208 INFO L134 CoverageAnalysis]: Checked inductivity of 732 backedges. 36 proven. 75 refuted. 0 times theorem prover too weak. 621 trivial. 0 not checked. [2023-12-02 12:35:11,208 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-12-02 12:35:13,371 INFO L134 CoverageAnalysis]: Checked inductivity of 732 backedges. 43 proven. 65 refuted. 0 times theorem prover too weak. 624 trivial. 0 not checked. [2023-12-02 12:35:13,371 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 12:35:13,371 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [358201533] [2023-12-02 12:35:13,372 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2023-12-02 12:35:13,372 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1462263053] [2023-12-02 12:35:13,372 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1462263053] provided 0 perfect and 2 imperfect interpolant sequences [2023-12-02 12:35:13,372 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [678668658] [2023-12-02 12:35:13,373 INFO L159 IcfgInterpreter]: Started Sifa with 25 locations of interest [2023-12-02 12:35:13,373 INFO L166 IcfgInterpreter]: Building call graph [2023-12-02 12:35:13,373 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-12-02 12:35:13,374 INFO L176 IcfgInterpreter]: Starting interpretation [2023-12-02 12:35:13,374 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-12-02 12:35:25,218 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 3 for LOIs [2023-12-02 12:35:25,221 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 7 for LOIs [2023-12-02 12:35:25,222 INFO L180 IcfgInterpreter]: Interpretation finished [2023-12-02 12:35:34,328 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '54239#(and (= |__VERIFIER_assert_#in~cond| 0) (= __VERIFIER_assert_~cond 0) (<= ~counter~0 20))' at error location [2023-12-02 12:35:34,328 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-12-02 12:35:34,328 INFO L185 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2023-12-02 12:35:34,329 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 13] total 26 [2023-12-02 12:35:34,329 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [917306130] [2023-12-02 12:35:34,329 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2023-12-02 12:35:34,329 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 26 states [2023-12-02 12:35:34,329 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 12:35:34,330 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2023-12-02 12:35:34,331 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=242, Invalid=1827, Unknown=1, NotChecked=0, Total=2070 [2023-12-02 12:35:34,331 INFO L87 Difference]: Start difference. First operand 2360 states and 3125 transitions. Second operand has 26 states, 25 states have (on average 2.52) internal successors, (63), 23 states have internal predecessors, (63), 14 states have call successors, (45), 3 states have call predecessors, (45), 2 states have return successors, (44), 14 states have call predecessors, (44), 14 states have call successors, (44) [2023-12-02 12:36:07,160 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 12:36:07,160 INFO L93 Difference]: Finished difference Result 2864 states and 3826 transitions. [2023-12-02 12:36:07,161 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 53 states. [2023-12-02 12:36:07,161 INFO L78 Accepts]: Start accepts. Automaton has has 26 states, 25 states have (on average 2.52) internal successors, (63), 23 states have internal predecessors, (63), 14 states have call successors, (45), 3 states have call predecessors, (45), 2 states have return successors, (44), 14 states have call predecessors, (44), 14 states have call successors, (44) Word has length 133 [2023-12-02 12:36:07,161 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 12:36:07,173 INFO L225 Difference]: With dead ends: 2864 [2023-12-02 12:36:07,173 INFO L226 Difference]: Without dead ends: 2862 [2023-12-02 12:36:07,176 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 444 GetRequests, 353 SyntacticMatches, 0 SemanticMatches, 91 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2795 ImplicationChecksByTransitivity, 35.3s TimeCoverageRelationStatistics Valid=1322, Invalid=7233, Unknown=1, NotChecked=0, Total=8556 [2023-12-02 12:36:07,176 INFO L413 NwaCegarLoop]: 63 mSDtfsCounter, 234 mSDsluCounter, 753 mSDsCounter, 0 mSdLazyCounter, 766 mSolverCounterSat, 223 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 6.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 238 SdHoareTripleChecker+Valid, 816 SdHoareTripleChecker+Invalid, 989 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 223 IncrementalHoareTripleChecker+Valid, 766 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 6.5s IncrementalHoareTripleChecker+Time [2023-12-02 12:36:07,177 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [238 Valid, 816 Invalid, 989 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [223 Valid, 766 Invalid, 0 Unknown, 0 Unchecked, 6.5s Time] [2023-12-02 12:36:07,180 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2862 states. [2023-12-02 12:36:08,942 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2862 to 2702. [2023-12-02 12:36:08,946 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2702 states, 1702 states have (on average 1.1974148061104584) internal successors, (2038), 1722 states have internal predecessors, (2038), 780 states have call successors, (780), 220 states have call predecessors, (780), 219 states have return successors, (771), 759 states have call predecessors, (771), 771 states have call successors, (771) [2023-12-02 12:36:08,952 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2702 states to 2702 states and 3589 transitions. [2023-12-02 12:36:08,952 INFO L78 Accepts]: Start accepts. Automaton has 2702 states and 3589 transitions. Word has length 133 [2023-12-02 12:36:08,952 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 12:36:08,952 INFO L495 AbstractCegarLoop]: Abstraction has 2702 states and 3589 transitions. [2023-12-02 12:36:08,953 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 26 states, 25 states have (on average 2.52) internal successors, (63), 23 states have internal predecessors, (63), 14 states have call successors, (45), 3 states have call predecessors, (45), 2 states have return successors, (44), 14 states have call predecessors, (44), 14 states have call successors, (44) [2023-12-02 12:36:08,953 INFO L276 IsEmpty]: Start isEmpty. Operand 2702 states and 3589 transitions. [2023-12-02 12:36:08,954 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 139 [2023-12-02 12:36:08,954 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 12:36:08,954 INFO L195 NwaCegarLoop]: trace histogram [20, 19, 19, 5, 5, 5, 5, 5, 5, 5, 5, 5, 4, 4, 3, 3, 3, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-12-02 12:36:08,959 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e6365f1c-6e1a-454b-8e39-744a0dfb75e7/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (24)] Ended with exit code 0 [2023-12-02 12:36:09,155 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 24 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e6365f1c-6e1a-454b-8e39-744a0dfb75e7/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable22 [2023-12-02 12:36:09,155 INFO L420 AbstractCegarLoop]: === Iteration 24 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 12:36:09,155 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 12:36:09,155 INFO L85 PathProgramCache]: Analyzing trace with hash -505343358, now seen corresponding path program 4 times [2023-12-02 12:36:09,155 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 12:36:09,155 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [370217543] [2023-12-02 12:36:09,156 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 12:36:09,156 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 12:36:09,165 ERROR L246 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2023-12-02 12:36:09,165 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [247676716] [2023-12-02 12:36:09,165 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2023-12-02 12:36:09,165 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 12:36:09,165 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e6365f1c-6e1a-454b-8e39-744a0dfb75e7/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 12:36:09,166 INFO L229 MonitoredProcess]: Starting monitored process 25 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e6365f1c-6e1a-454b-8e39-744a0dfb75e7/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 12:36:09,167 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e6365f1c-6e1a-454b-8e39-744a0dfb75e7/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (25)] Waiting until timeout for monitored process [2023-12-02 12:36:09,255 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 12:36:09,258 INFO L262 TraceCheckSpWp]: Trace formula consists of 350 conjuncts, 68 conjunts are in the unsatisfiable core [2023-12-02 12:36:09,262 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 12:36:11,133 INFO L134 CoverageAnalysis]: Checked inductivity of 810 backedges. 91 proven. 80 refuted. 0 times theorem prover too weak. 639 trivial. 0 not checked. [2023-12-02 12:36:11,133 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-12-02 12:36:17,812 INFO L134 CoverageAnalysis]: Checked inductivity of 810 backedges. 91 proven. 77 refuted. 0 times theorem prover too weak. 642 trivial. 0 not checked. [2023-12-02 12:36:17,812 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 12:36:17,812 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [370217543] [2023-12-02 12:36:17,812 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2023-12-02 12:36:17,812 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [247676716] [2023-12-02 12:36:17,812 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [247676716] provided 0 perfect and 2 imperfect interpolant sequences [2023-12-02 12:36:17,812 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [494459915] [2023-12-02 12:36:17,814 INFO L159 IcfgInterpreter]: Started Sifa with 25 locations of interest [2023-12-02 12:36:17,814 INFO L166 IcfgInterpreter]: Building call graph [2023-12-02 12:36:17,814 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-12-02 12:36:17,815 INFO L176 IcfgInterpreter]: Starting interpretation [2023-12-02 12:36:17,815 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-12-02 12:36:30,046 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 3 for LOIs [2023-12-02 12:36:30,050 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 7 for LOIs [2023-12-02 12:36:30,051 INFO L180 IcfgInterpreter]: Interpretation finished [2023-12-02 12:36:44,697 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '63502#(and (= |__VERIFIER_assert_#in~cond| 0) (= __VERIFIER_assert_~cond 0) (<= ~counter~0 20))' at error location [2023-12-02 12:36:44,697 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-12-02 12:36:44,697 INFO L185 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2023-12-02 12:36:44,697 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 15] total 29 [2023-12-02 12:36:44,697 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1014725233] [2023-12-02 12:36:44,697 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2023-12-02 12:36:44,698 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 29 states [2023-12-02 12:36:44,698 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 12:36:44,698 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 29 interpolants. [2023-12-02 12:36:44,699 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=311, Invalid=2038, Unknown=3, NotChecked=0, Total=2352 [2023-12-02 12:36:44,699 INFO L87 Difference]: Start difference. First operand 2702 states and 3589 transitions. Second operand has 29 states, 27 states have (on average 2.5185185185185186) internal successors, (68), 26 states have internal predecessors, (68), 15 states have call successors, (47), 3 states have call predecessors, (47), 3 states have return successors, (46), 15 states have call predecessors, (46), 14 states have call successors, (46) [2023-12-02 12:37:23,827 WARN L293 SmtUtils]: Spent 23.23s on a formula simplification that was a NOOP. DAG size: 104 (called from [L 391] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2023-12-02 12:37:25,894 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.01s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2023-12-02 12:37:28,631 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2023-12-02 12:37:40,666 WARN L293 SmtUtils]: Spent 7.35s on a formula simplification that was a NOOP. DAG size: 86 (called from [L 391] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2023-12-02 12:37:48,759 WARN L293 SmtUtils]: Spent 7.50s on a formula simplification that was a NOOP. DAG size: 121 (called from [L 391] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2023-12-02 12:37:50,006 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.24s for a HTC check with result INVALID. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2023-12-02 12:37:52,015 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.01s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2023-12-02 12:37:54,730 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.61s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2023-12-02 12:37:58,010 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.01s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2023-12-02 12:38:00,749 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.01s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2023-12-02 12:38:02,894 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2023-12-02 12:38:26,912 WARN L293 SmtUtils]: Spent 17.31s on a formula simplification that was a NOOP. DAG size: 105 (called from [L 391] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2023-12-02 12:38:28,973 WARN L539 Checker$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 12:38:30,976 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2023-12-02 12:38:32,637 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.61s for a HTC check with result INVALID. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2023-12-02 12:38:34,651 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.01s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2023-12-02 12:38:37,076 WARN L539 Checker$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 12:38:55,029 WARN L293 SmtUtils]: Spent 13.39s on a formula simplification that was a NOOP. DAG size: 103 (called from [L 391] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2023-12-02 12:38:57,104 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2023-12-02 12:39:11,532 WARN L293 SmtUtils]: Spent 9.45s on a formula simplification that was a NOOP. DAG size: 85 (called from [L 391] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2023-12-02 12:39:13,612 WARN L539 Checker$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 12:39:22,785 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.67s for a HTC check with result INVALID. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2023-12-02 12:39:24,964 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.01s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2023-12-02 12:39:27,634 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2023-12-02 12:39:29,638 WARN L539 Checker$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 12:39:32,029 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2023-12-02 12:39:34,528 WARN L539 Checker$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 12:39:40,152 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 5.62s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2023-12-02 12:39:42,160 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.01s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2023-12-02 12:39:44,236 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2023-12-02 12:39:46,222 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.99s for a HTC check with result INVALID. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2023-12-02 12:39:48,289 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.01s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2023-12-02 12:39:50,292 WARN L539 Checker$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 12:39:52,294 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2023-12-02 12:40:06,829 WARN L293 SmtUtils]: Spent 11.04s on a formula simplification that was a NOOP. DAG size: 83 (called from [L 391] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2023-12-02 12:40:18,640 WARN L539 Checker$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 12:40:22,392 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.01s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2023-12-02 12:41:07,820 WARN L539 Checker$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 12:41:09,998 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2023-12-02 12:41:12,866 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.01s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2023-12-02 12:41:15,256 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2023-12-02 12:41:30,381 WARN L293 SmtUtils]: Spent 6.08s on a formula simplification that was a NOOP. DAG size: 102 (called from [L 391] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2023-12-02 12:41:32,409 WARN L539 Checker$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 12:41:34,416 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.01s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2023-12-02 12:41:36,418 WARN L539 Checker$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 12:41:38,431 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.01s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2023-12-02 12:41:40,757 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.01s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2023-12-02 12:41:49,055 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 12:41:49,055 INFO L93 Difference]: Finished difference Result 3422 states and 4656 transitions. [2023-12-02 12:41:49,056 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 40 states. [2023-12-02 12:41:49,056 INFO L78 Accepts]: Start accepts. Automaton has has 29 states, 27 states have (on average 2.5185185185185186) internal successors, (68), 26 states have internal predecessors, (68), 15 states have call successors, (47), 3 states have call predecessors, (47), 3 states have return successors, (46), 15 states have call predecessors, (46), 14 states have call successors, (46) Word has length 138 [2023-12-02 12:41:49,057 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 12:41:49,075 INFO L225 Difference]: With dead ends: 3422 [2023-12-02 12:41:49,075 INFO L226 Difference]: Without dead ends: 3418 [2023-12-02 12:41:49,078 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 443 GetRequests, 365 SyntacticMatches, 0 SemanticMatches, 78 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2009 ImplicationChecksByTransitivity, 220.3s TimeCoverageRelationStatistics Valid=1084, Invalid=5210, Unknown=26, NotChecked=0, Total=6320 [2023-12-02 12:41:49,079 INFO L413 NwaCegarLoop]: 53 mSDtfsCounter, 272 mSDsluCounter, 765 mSDsCounter, 0 mSdLazyCounter, 897 mSolverCounterSat, 202 mSolverCounterUnsat, 35 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 99.7s Time, 0 mProtectedPredicate, 0 mProtectedAction, 285 SdHoareTripleChecker+Valid, 818 SdHoareTripleChecker+Invalid, 1134 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 202 IncrementalHoareTripleChecker+Valid, 897 IncrementalHoareTripleChecker+Invalid, 35 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 99.9s IncrementalHoareTripleChecker+Time [2023-12-02 12:41:49,079 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [285 Valid, 818 Invalid, 1134 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [202 Valid, 897 Invalid, 35 Unknown, 0 Unchecked, 99.9s Time] [2023-12-02 12:41:49,083 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 3418 states. [2023-12-02 12:41:52,708 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 3418 to 3286. [2023-12-02 12:41:52,711 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 3286 states, 2054 states have (on average 1.2064264849074975) internal successors, (2478), 2083 states have internal predecessors, (2478), 995 states have call successors, (995), 237 states have call predecessors, (995), 236 states have return successors, (987), 965 states have call predecessors, (987), 987 states have call successors, (987) [2023-12-02 12:41:52,720 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3286 states to 3286 states and 4460 transitions. [2023-12-02 12:41:52,720 INFO L78 Accepts]: Start accepts. Automaton has 3286 states and 4460 transitions. Word has length 138 [2023-12-02 12:41:52,721 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 12:41:52,721 INFO L495 AbstractCegarLoop]: Abstraction has 3286 states and 4460 transitions. [2023-12-02 12:41:52,721 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 29 states, 27 states have (on average 2.5185185185185186) internal successors, (68), 26 states have internal predecessors, (68), 15 states have call successors, (47), 3 states have call predecessors, (47), 3 states have return successors, (46), 15 states have call predecessors, (46), 14 states have call successors, (46) [2023-12-02 12:41:52,721 INFO L276 IsEmpty]: Start isEmpty. Operand 3286 states and 4460 transitions. [2023-12-02 12:41:52,723 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 141 [2023-12-02 12:41:52,723 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 12:41:52,723 INFO L195 NwaCegarLoop]: trace histogram [21, 20, 20, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 4, 4, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-12-02 12:41:52,728 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e6365f1c-6e1a-454b-8e39-744a0dfb75e7/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (25)] Ended with exit code 0 [2023-12-02 12:41:52,924 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 25 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e6365f1c-6e1a-454b-8e39-744a0dfb75e7/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable23 [2023-12-02 12:41:52,924 INFO L420 AbstractCegarLoop]: === Iteration 25 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 12:41:52,924 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 12:41:52,924 INFO L85 PathProgramCache]: Analyzing trace with hash -1548326695, now seen corresponding path program 3 times [2023-12-02 12:41:52,924 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 12:41:52,925 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2123569540] [2023-12-02 12:41:52,925 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 12:41:52,925 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 12:41:52,935 ERROR L246 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2023-12-02 12:41:52,935 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1768426382] [2023-12-02 12:41:52,935 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2023-12-02 12:41:52,936 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 12:41:52,936 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e6365f1c-6e1a-454b-8e39-744a0dfb75e7/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 12:41:52,937 INFO L229 MonitoredProcess]: Starting monitored process 26 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e6365f1c-6e1a-454b-8e39-744a0dfb75e7/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 12:41:52,938 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e6365f1c-6e1a-454b-8e39-744a0dfb75e7/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (26)] Waiting until timeout for monitored process [2023-12-02 12:41:53,039 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2023-12-02 12:41:53,039 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-12-02 12:41:53,041 INFO L262 TraceCheckSpWp]: Trace formula consists of 303 conjuncts, 53 conjunts are in the unsatisfiable core [2023-12-02 12:41:53,045 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 12:41:54,023 INFO L134 CoverageAnalysis]: Checked inductivity of 885 backedges. 40 proven. 76 refuted. 0 times theorem prover too weak. 769 trivial. 0 not checked. [2023-12-02 12:41:54,023 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-12-02 12:41:56,300 INFO L134 CoverageAnalysis]: Checked inductivity of 885 backedges. 40 proven. 73 refuted. 0 times theorem prover too weak. 772 trivial. 0 not checked. [2023-12-02 12:41:56,300 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 12:41:56,300 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2123569540] [2023-12-02 12:41:56,300 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2023-12-02 12:41:56,300 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1768426382] [2023-12-02 12:41:56,300 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1768426382] provided 0 perfect and 2 imperfect interpolant sequences [2023-12-02 12:41:56,300 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [2047562743] [2023-12-02 12:41:56,302 INFO L159 IcfgInterpreter]: Started Sifa with 26 locations of interest [2023-12-02 12:41:56,302 INFO L166 IcfgInterpreter]: Building call graph [2023-12-02 12:41:56,302 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-12-02 12:41:56,302 INFO L176 IcfgInterpreter]: Starting interpretation [2023-12-02 12:41:56,302 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-12-02 12:42:08,554 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 1 for LOIs [2023-12-02 12:42:08,558 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 7 for LOIs [2023-12-02 12:42:08,559 INFO L180 IcfgInterpreter]: Interpretation finished [2023-12-02 12:42:16,197 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '74536#(and (= |__VERIFIER_assert_#in~cond| 0) (= __VERIFIER_assert_~cond 0))' at error location [2023-12-02 12:42:16,197 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-12-02 12:42:16,197 INFO L185 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2023-12-02 12:42:16,197 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 13] total 26 [2023-12-02 12:42:16,197 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [525546097] [2023-12-02 12:42:16,197 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2023-12-02 12:42:16,198 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 26 states [2023-12-02 12:42:16,198 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 12:42:16,199 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2023-12-02 12:42:16,199 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=236, Invalid=1834, Unknown=0, NotChecked=0, Total=2070 [2023-12-02 12:42:16,199 INFO L87 Difference]: Start difference. First operand 3286 states and 4460 transitions. Second operand has 26 states, 23 states have (on average 2.4782608695652173) internal successors, (57), 23 states have internal predecessors, (57), 16 states have call successors, (49), 3 states have call predecessors, (49), 2 states have return successors, (48), 14 states have call predecessors, (48), 14 states have call successors, (48) [2023-12-02 12:42:56,093 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 12:42:56,093 INFO L93 Difference]: Finished difference Result 3432 states and 4650 transitions. [2023-12-02 12:42:56,093 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 46 states. [2023-12-02 12:42:56,094 INFO L78 Accepts]: Start accepts. Automaton has has 26 states, 23 states have (on average 2.4782608695652173) internal successors, (57), 23 states have internal predecessors, (57), 16 states have call successors, (49), 3 states have call predecessors, (49), 2 states have return successors, (48), 14 states have call predecessors, (48), 14 states have call successors, (48) Word has length 140 [2023-12-02 12:42:56,094 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 12:42:56,107 INFO L225 Difference]: With dead ends: 3432 [2023-12-02 12:42:56,108 INFO L226 Difference]: Without dead ends: 3401 [2023-12-02 12:42:56,109 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 457 GetRequests, 374 SyntacticMatches, 0 SemanticMatches, 83 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1977 ImplicationChecksByTransitivity, 35.0s TimeCoverageRelationStatistics Valid=973, Invalid=6167, Unknown=0, NotChecked=0, Total=7140 [2023-12-02 12:42:56,110 INFO L413 NwaCegarLoop]: 102 mSDtfsCounter, 240 mSDsluCounter, 1202 mSDsCounter, 0 mSdLazyCounter, 1174 mSolverCounterSat, 244 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 10.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 244 SdHoareTripleChecker+Valid, 1304 SdHoareTripleChecker+Invalid, 1418 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 244 IncrementalHoareTripleChecker+Valid, 1174 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 10.4s IncrementalHoareTripleChecker+Time [2023-12-02 12:42:56,110 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [244 Valid, 1304 Invalid, 1418 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [244 Valid, 1174 Invalid, 0 Unknown, 0 Unchecked, 10.4s Time] [2023-12-02 12:42:56,112 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 3401 states. [2023-12-02 12:42:59,667 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 3401 to 3355. [2023-12-02 12:42:59,669 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 3355 states, 2094 states have (on average 1.2024832855778413) internal successors, (2518), 2123 states have internal predecessors, (2518), 1018 states have call successors, (1018), 242 states have call predecessors, (1018), 242 states have return successors, (1011), 989 states have call predecessors, (1011), 1011 states have call successors, (1011) [2023-12-02 12:42:59,676 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3355 states to 3355 states and 4547 transitions. [2023-12-02 12:42:59,676 INFO L78 Accepts]: Start accepts. Automaton has 3355 states and 4547 transitions. Word has length 140 [2023-12-02 12:42:59,676 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 12:42:59,676 INFO L495 AbstractCegarLoop]: Abstraction has 3355 states and 4547 transitions. [2023-12-02 12:42:59,677 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 26 states, 23 states have (on average 2.4782608695652173) internal successors, (57), 23 states have internal predecessors, (57), 16 states have call successors, (49), 3 states have call predecessors, (49), 2 states have return successors, (48), 14 states have call predecessors, (48), 14 states have call successors, (48) [2023-12-02 12:42:59,677 INFO L276 IsEmpty]: Start isEmpty. Operand 3355 states and 4547 transitions. [2023-12-02 12:42:59,678 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 157 [2023-12-02 12:42:59,678 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 12:42:59,678 INFO L195 NwaCegarLoop]: trace histogram [23, 22, 22, 6, 6, 6, 6, 6, 6, 6, 5, 5, 5, 4, 3, 3, 3, 3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-12-02 12:42:59,683 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e6365f1c-6e1a-454b-8e39-744a0dfb75e7/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (26)] Ended with exit code 0 [2023-12-02 12:42:59,879 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 26 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e6365f1c-6e1a-454b-8e39-744a0dfb75e7/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable24 [2023-12-02 12:42:59,879 INFO L420 AbstractCegarLoop]: === Iteration 26 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 12:42:59,879 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 12:42:59,879 INFO L85 PathProgramCache]: Analyzing trace with hash 1551225450, now seen corresponding path program 5 times [2023-12-02 12:42:59,879 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 12:42:59,880 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [699455481] [2023-12-02 12:42:59,880 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 12:42:59,880 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 12:42:59,888 ERROR L246 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2023-12-02 12:42:59,888 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [336538039] [2023-12-02 12:42:59,889 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2023-12-02 12:42:59,889 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 12:42:59,889 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e6365f1c-6e1a-454b-8e39-744a0dfb75e7/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 12:42:59,889 INFO L229 MonitoredProcess]: Starting monitored process 27 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e6365f1c-6e1a-454b-8e39-744a0dfb75e7/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 12:42:59,890 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e6365f1c-6e1a-454b-8e39-744a0dfb75e7/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (27)] Waiting until timeout for monitored process [2023-12-02 12:42:59,979 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2023-12-02 12:42:59,979 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-12-02 12:42:59,981 INFO L262 TraceCheckSpWp]: Trace formula consists of 269 conjuncts, 65 conjunts are in the unsatisfiable core [2023-12-02 12:42:59,984 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 12:43:00,523 INFO L134 CoverageAnalysis]: Checked inductivity of 1085 backedges. 153 proven. 89 refuted. 0 times theorem prover too weak. 843 trivial. 0 not checked. [2023-12-02 12:43:00,523 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-12-02 12:43:00,591 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 12:43:00,591 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [699455481] [2023-12-02 12:43:00,591 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2023-12-02 12:43:00,591 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [336538039] [2023-12-02 12:43:00,592 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [336538039] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 12:43:00,592 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [576329477] [2023-12-02 12:43:00,592 INFO L159 IcfgInterpreter]: Started Sifa with 25 locations of interest [2023-12-02 12:43:00,593 INFO L166 IcfgInterpreter]: Building call graph [2023-12-02 12:43:00,593 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-12-02 12:43:00,593 INFO L176 IcfgInterpreter]: Starting interpretation [2023-12-02 12:43:00,593 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-12-02 12:43:13,069 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 3 for LOIs [2023-12-02 12:43:13,072 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 7 for LOIs [2023-12-02 12:43:13,073 INFO L180 IcfgInterpreter]: Interpretation finished [2023-12-02 12:43:15,884 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '85331#(and (= |__VERIFIER_assert_#in~cond| 0) (= __VERIFIER_assert_~cond 0) (<= ~counter~0 20))' at error location [2023-12-02 12:43:15,884 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-12-02 12:43:15,884 INFO L185 FreeRefinementEngine]: Found 0 perfect and 1 imperfect interpolant sequences. [2023-12-02 12:43:15,885 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13] total 13 [2023-12-02 12:43:15,885 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1067219147] [2023-12-02 12:43:15,885 INFO L85 oduleStraightlineAll]: Using 1 imperfect interpolants to construct interpolant automaton [2023-12-02 12:43:15,885 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 13 states [2023-12-02 12:43:15,885 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 12:43:15,886 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2023-12-02 12:43:15,886 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=165, Invalid=1095, Unknown=0, NotChecked=0, Total=1260 [2023-12-02 12:43:15,886 INFO L87 Difference]: Start difference. First operand 3355 states and 4547 transitions. Second operand has 13 states, 11 states have (on average 3.0) internal successors, (33), 11 states have internal predecessors, (33), 7 states have call successors, (18), 2 states have call predecessors, (18), 3 states have return successors, (18), 7 states have call predecessors, (18), 6 states have call successors, (18) [2023-12-02 12:43:19,953 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 12:43:19,953 INFO L93 Difference]: Finished difference Result 3474 states and 4670 transitions. [2023-12-02 12:43:19,954 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2023-12-02 12:43:19,954 INFO L78 Accepts]: Start accepts. Automaton has has 13 states, 11 states have (on average 3.0) internal successors, (33), 11 states have internal predecessors, (33), 7 states have call successors, (18), 2 states have call predecessors, (18), 3 states have return successors, (18), 7 states have call predecessors, (18), 6 states have call successors, (18) Word has length 156 [2023-12-02 12:43:19,954 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 12:43:19,968 INFO L225 Difference]: With dead ends: 3474 [2023-12-02 12:43:19,968 INFO L226 Difference]: Without dead ends: 3470 [2023-12-02 12:43:19,969 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 320 GetRequests, 282 SyntacticMatches, 0 SemanticMatches, 38 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 402 ImplicationChecksByTransitivity, 3.0s TimeCoverageRelationStatistics Valid=193, Invalid=1367, Unknown=0, NotChecked=0, Total=1560 [2023-12-02 12:43:19,970 INFO L413 NwaCegarLoop]: 33 mSDtfsCounter, 32 mSDsluCounter, 269 mSDsCounter, 0 mSdLazyCounter, 304 mSolverCounterSat, 10 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 39 SdHoareTripleChecker+Valid, 302 SdHoareTripleChecker+Invalid, 314 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 10 IncrementalHoareTripleChecker+Valid, 304 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2023-12-02 12:43:19,970 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [39 Valid, 302 Invalid, 314 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [10 Valid, 304 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2023-12-02 12:43:19,972 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 3470 states. [2023-12-02 12:43:23,942 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 3470 to 3451. [2023-12-02 12:43:23,944 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 3451 states, 2160 states have (on average 1.198611111111111) internal successors, (2589), 2187 states have internal predecessors, (2589), 1030 states have call successors, (1030), 261 states have call predecessors, (1030), 260 states have return successors, (1023), 1002 states have call predecessors, (1023), 1023 states have call successors, (1023) [2023-12-02 12:43:23,953 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3451 states to 3451 states and 4642 transitions. [2023-12-02 12:43:23,953 INFO L78 Accepts]: Start accepts. Automaton has 3451 states and 4642 transitions. Word has length 156 [2023-12-02 12:43:23,953 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 12:43:23,953 INFO L495 AbstractCegarLoop]: Abstraction has 3451 states and 4642 transitions. [2023-12-02 12:43:23,953 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 13 states, 11 states have (on average 3.0) internal successors, (33), 11 states have internal predecessors, (33), 7 states have call successors, (18), 2 states have call predecessors, (18), 3 states have return successors, (18), 7 states have call predecessors, (18), 6 states have call successors, (18) [2023-12-02 12:43:23,954 INFO L276 IsEmpty]: Start isEmpty. Operand 3451 states and 4642 transitions. [2023-12-02 12:43:23,956 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 166 [2023-12-02 12:43:23,957 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 12:43:23,957 INFO L195 NwaCegarLoop]: trace histogram [24, 23, 23, 6, 6, 6, 6, 6, 6, 6, 6, 6, 5, 4, 4, 4, 4, 3, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-12-02 12:43:23,964 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e6365f1c-6e1a-454b-8e39-744a0dfb75e7/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (27)] Ended with exit code 0 [2023-12-02 12:43:24,157 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable25,27 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e6365f1c-6e1a-454b-8e39-744a0dfb75e7/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 12:43:24,158 INFO L420 AbstractCegarLoop]: === Iteration 27 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 12:43:24,158 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 12:43:24,158 INFO L85 PathProgramCache]: Analyzing trace with hash -2043533228, now seen corresponding path program 6 times [2023-12-02 12:43:24,158 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 12:43:24,159 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1218498437] [2023-12-02 12:43:24,159 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 12:43:24,159 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 12:43:24,175 ERROR L246 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2023-12-02 12:43:24,175 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [656228628] [2023-12-02 12:43:24,176 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2023-12-02 12:43:24,176 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 12:43:24,176 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e6365f1c-6e1a-454b-8e39-744a0dfb75e7/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 12:43:24,177 INFO L229 MonitoredProcess]: Starting monitored process 28 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e6365f1c-6e1a-454b-8e39-744a0dfb75e7/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 12:43:24,179 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e6365f1c-6e1a-454b-8e39-744a0dfb75e7/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (28)] Waiting until timeout for monitored process [2023-12-02 12:43:24,299 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2023-12-02 12:43:24,299 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-12-02 12:43:24,303 INFO L262 TraceCheckSpWp]: Trace formula consists of 371 conjuncts, 96 conjunts are in the unsatisfiable core [2023-12-02 12:43:24,309 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 12:43:26,595 INFO L134 CoverageAnalysis]: Checked inductivity of 1191 backedges. 106 proven. 244 refuted. 0 times theorem prover too weak. 841 trivial. 0 not checked. [2023-12-02 12:43:26,595 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-12-02 12:44:02,334 WARN L876 $PredicateComparison]: unable to prove that (let ((.cse0 (* |c_ULTIMATE.start_main_~y~0#1| |c_ULTIMATE.start_main_~s~0#1|)) (.cse1 (* |c_ULTIMATE.start_main_~x~0#1| |c_ULTIMATE.start_main_~q~0#1|)) (.cse2 (* |c_ULTIMATE.start_main_~yy~0#1| |c_ULTIMATE.start_main_~r~0#1|)) (.cse3 (* |c_ULTIMATE.start_main_~xy~0#1| |c_ULTIMATE.start_main_~p~0#1|)) (.cse5 (* |c_ULTIMATE.start_main_~y~0#1| |c_ULTIMATE.start_main_~b~0#1|)) (.cse4 (* |c_ULTIMATE.start_main_~x~0#1| |c_ULTIMATE.start_main_~k~0#1| |c_ULTIMATE.start_main_~q~0#1|)) (.cse6 (* |c_ULTIMATE.start_main_~y~0#1| |c_ULTIMATE.start_main_~s~0#1| |c_ULTIMATE.start_main_~k~0#1|)) (.cse7 (* |c_ULTIMATE.start_main_~xy~0#1| |c_ULTIMATE.start_main_~k~0#1| |c_ULTIMATE.start_main_~q~0#1|)) (.cse9 (* |c_ULTIMATE.start_main_~c~0#1| |c_ULTIMATE.start_main_~y~0#1|)) (.cse8 (* |c_ULTIMATE.start_main_~xy~0#1| |c_ULTIMATE.start_main_~q~0#1|)) (.cse10 (* |c_ULTIMATE.start_main_~x~0#1| |c_ULTIMATE.start_main_~p~0#1|)) (.cse11 (* |c_ULTIMATE.start_main_~yy~0#1| |c_ULTIMATE.start_main_~s~0#1| |c_ULTIMATE.start_main_~k~0#1|)) (.cse12 (* |c_ULTIMATE.start_main_~y~0#1| |c_ULTIMATE.start_main_~r~0#1|)) (.cse14 (* 2 |c_ULTIMATE.start_main_~b~0#1|)) (.cse13 (* |c_ULTIMATE.start_main_~yy~0#1| |c_ULTIMATE.start_main_~s~0#1|))) (or (not (= (+ |c_ULTIMATE.start_main_~c~0#1| .cse0 .cse1 .cse2 .cse3 .cse4 .cse5 .cse6) (+ .cse7 .cse8 .cse9 .cse10 .cse11 .cse12 .cse13 |c_ULTIMATE.start_main_~b~0#1|))) (< .cse14 (+ |c_ULTIMATE.start_main_~c~0#1| 1)) (< (* |c_ULTIMATE.start_main_~c~0#1| 2) (+ (* 3 |c_ULTIMATE.start_main_~b~0#1|) 1)) (= (+ |c_ULTIMATE.start_main_~c~0#1| (* .cse0 2) (* .cse1 2) .cse2 .cse3 (* 2 .cse5) .cse4 .cse6) (+ .cse7 .cse9 (* .cse8 2) .cse10 .cse11 .cse12 .cse14 (* 2 .cse13))))) is different from true