./Ultimate.py --spec ../../sv-benchmarks/c/properties/unreach-call.prp --file ../../sv-benchmarks/c/nla-digbench-scaling/egcd3-ll_valuebound10.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_da5dfcc8-f7a4-4d22-a963-15355fed9e59/bin/utaipan-verify-nQ1chXbOIh/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_da5dfcc8-f7a4-4d22-a963-15355fed9e59/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_da5dfcc8-f7a4-4d22-a963-15355fed9e59/bin/utaipan-verify-nQ1chXbOIh/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_da5dfcc8-f7a4-4d22-a963-15355fed9e59/bin/utaipan-verify-nQ1chXbOIh/config/TaipanReach.xml -i ../../sv-benchmarks/c/nla-digbench-scaling/egcd3-ll_valuebound10.c -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_da5dfcc8-f7a4-4d22-a963-15355fed9e59/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_da5dfcc8-f7a4-4d22-a963-15355fed9e59/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 776d32abf1ae3b62e7ad4a02cd7c02c0cc6433852a1fe73b7d30c6e216da832a --- Real Ultimate output --- This is Ultimate 0.2.4-dev-0e0057c [2023-12-02 19:12:49,171 INFO L188 SettingsManager]: Resetting all preferences to default values... [2023-12-02 19:12:49,236 INFO L114 SettingsManager]: Loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_da5dfcc8-f7a4-4d22-a963-15355fed9e59/bin/utaipan-verify-nQ1chXbOIh/config/svcomp-Reach-32bit-Taipan_Default.epf [2023-12-02 19:12:49,240 WARN L101 SettingsManager]: Preference file contains the following unknown settings: [2023-12-02 19:12:49,241 WARN L103 SettingsManager]: * de.uni_freiburg.informatik.ultimate.core.Log level for class [2023-12-02 19:12:49,265 INFO L130 SettingsManager]: Preferences different from defaults after loading the file: [2023-12-02 19:12:49,265 INFO L151 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2023-12-02 19:12:49,266 INFO L153 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2023-12-02 19:12:49,267 INFO L151 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2023-12-02 19:12:49,267 INFO L153 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2023-12-02 19:12:49,268 INFO L153 SettingsManager]: * User list type=DISABLED [2023-12-02 19:12:49,268 INFO L151 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2023-12-02 19:12:49,269 INFO L153 SettingsManager]: * Explicit value domain=true [2023-12-02 19:12:49,269 INFO L153 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2023-12-02 19:12:49,270 INFO L153 SettingsManager]: * Octagon Domain=false [2023-12-02 19:12:49,270 INFO L153 SettingsManager]: * Abstract domain=CompoundDomain [2023-12-02 19:12:49,271 INFO L153 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2023-12-02 19:12:49,271 INFO L153 SettingsManager]: * Use the RCFG-of-the-future interface=true [2023-12-02 19:12:49,272 INFO L153 SettingsManager]: * Interval Domain=false [2023-12-02 19:12:49,272 INFO L151 SettingsManager]: Preferences of Sifa differ from their defaults: [2023-12-02 19:12:49,273 INFO L153 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2023-12-02 19:12:49,278 INFO L153 SettingsManager]: * Simplification Technique=POLY_PAC [2023-12-02 19:12:49,278 INFO L151 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2023-12-02 19:12:49,279 INFO L153 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2023-12-02 19:12:49,279 INFO L153 SettingsManager]: * sizeof long=4 [2023-12-02 19:12:49,279 INFO L153 SettingsManager]: * Overapproximate operations on floating types=true [2023-12-02 19:12:49,280 INFO L153 SettingsManager]: * sizeof POINTER=4 [2023-12-02 19:12:49,280 INFO L153 SettingsManager]: * Check division by zero=IGNORE [2023-12-02 19:12:49,280 INFO L153 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2023-12-02 19:12:49,281 INFO L153 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2023-12-02 19:12:49,281 INFO L153 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2023-12-02 19:12:49,281 INFO L153 SettingsManager]: * sizeof long double=12 [2023-12-02 19:12:49,282 INFO L153 SettingsManager]: * Check if freed pointer was valid=false [2023-12-02 19:12:49,282 INFO L153 SettingsManager]: * Use constant arrays=true [2023-12-02 19:12:49,282 INFO L151 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2023-12-02 19:12:49,282 INFO L153 SettingsManager]: * Only consider context switches at boundaries of atomic blocks=true [2023-12-02 19:12:49,283 INFO L153 SettingsManager]: * SMT solver=External_DefaultMode [2023-12-02 19:12:49,283 INFO L153 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2023-12-02 19:12:49,283 INFO L151 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2023-12-02 19:12:49,283 INFO L153 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2023-12-02 19:12:49,283 INFO L153 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopHeads [2023-12-02 19:12:49,284 INFO L153 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2023-12-02 19:12:49,284 INFO L153 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2023-12-02 19:12:49,284 INFO L153 SettingsManager]: * Apply one-shot large block encoding in concurrent analysis=false [2023-12-02 19:12:49,284 INFO L153 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2023-12-02 19:12:49,285 INFO L153 SettingsManager]: * Trace refinement exception blacklist=NONE [2023-12-02 19:12:49,285 INFO L153 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2023-12-02 19:12:49,285 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_da5dfcc8-f7a4-4d22-a963-15355fed9e59/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_da5dfcc8-f7a4-4d22-a963-15355fed9e59/bin/utaipan-verify-nQ1chXbOIh Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> 776d32abf1ae3b62e7ad4a02cd7c02c0cc6433852a1fe73b7d30c6e216da832a [2023-12-02 19:12:49,500 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2023-12-02 19:12:49,521 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2023-12-02 19:12:49,523 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2023-12-02 19:12:49,525 INFO L270 PluginConnector]: Initializing CDTParser... [2023-12-02 19:12:49,525 INFO L274 PluginConnector]: CDTParser initialized [2023-12-02 19:12:49,526 INFO L431 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_da5dfcc8-f7a4-4d22-a963-15355fed9e59/bin/utaipan-verify-nQ1chXbOIh/../../sv-benchmarks/c/nla-digbench-scaling/egcd3-ll_valuebound10.c [2023-12-02 19:12:52,255 INFO L533 CDTParser]: Created temporary CDT project at NULL [2023-12-02 19:12:52,427 INFO L384 CDTParser]: Found 1 translation units. [2023-12-02 19:12:52,427 INFO L180 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_da5dfcc8-f7a4-4d22-a963-15355fed9e59/sv-benchmarks/c/nla-digbench-scaling/egcd3-ll_valuebound10.c [2023-12-02 19:12:52,433 INFO L427 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_da5dfcc8-f7a4-4d22-a963-15355fed9e59/bin/utaipan-verify-nQ1chXbOIh/data/87bf410d8/559d15275ddd433fb1db0f799888c523/FLAG81d401779 [2023-12-02 19:12:52,452 INFO L435 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_da5dfcc8-f7a4-4d22-a963-15355fed9e59/bin/utaipan-verify-nQ1chXbOIh/data/87bf410d8/559d15275ddd433fb1db0f799888c523 [2023-12-02 19:12:52,454 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2023-12-02 19:12:52,456 INFO L133 ToolchainWalker]: Walking toolchain with 6 elements. [2023-12-02 19:12:52,457 INFO L112 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2023-12-02 19:12:52,457 INFO L270 PluginConnector]: Initializing CACSL2BoogieTranslator... [2023-12-02 19:12:52,463 INFO L274 PluginConnector]: CACSL2BoogieTranslator initialized [2023-12-02 19:12:52,463 INFO L184 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 02.12 07:12:52" (1/1) ... [2023-12-02 19:12:52,465 INFO L204 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@6f566a67 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 07:12:52, skipping insertion in model container [2023-12-02 19:12:52,465 INFO L184 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 02.12 07:12:52" (1/1) ... [2023-12-02 19:12:52,488 INFO L177 MainTranslator]: Built tables and reachable declarations [2023-12-02 19:12:52,636 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_da5dfcc8-f7a4-4d22-a963-15355fed9e59/sv-benchmarks/c/nla-digbench-scaling/egcd3-ll_valuebound10.c[490,503] [2023-12-02 19:12:52,654 INFO L209 PostProcessor]: Analyzing one entry point: main [2023-12-02 19:12:52,665 INFO L202 MainTranslator]: Completed pre-run [2023-12-02 19:12:52,677 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_da5dfcc8-f7a4-4d22-a963-15355fed9e59/sv-benchmarks/c/nla-digbench-scaling/egcd3-ll_valuebound10.c[490,503] [2023-12-02 19:12:52,686 INFO L209 PostProcessor]: Analyzing one entry point: main [2023-12-02 19:12:52,698 INFO L206 MainTranslator]: Completed translation [2023-12-02 19:12:52,698 INFO L201 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 07:12:52 WrapperNode [2023-12-02 19:12:52,699 INFO L131 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2023-12-02 19:12:52,699 INFO L112 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2023-12-02 19:12:52,699 INFO L270 PluginConnector]: Initializing Boogie Procedure Inliner... [2023-12-02 19:12:52,700 INFO L274 PluginConnector]: Boogie Procedure Inliner initialized [2023-12-02 19:12:52,707 INFO L184 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 07:12:52" (1/1) ... [2023-12-02 19:12:52,714 INFO L184 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 07:12:52" (1/1) ... [2023-12-02 19:12:52,734 INFO L138 Inliner]: procedures = 14, calls = 16, calls flagged for inlining = 2, calls inlined = 2, statements flattened = 83 [2023-12-02 19:12:52,734 INFO L131 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2023-12-02 19:12:52,735 INFO L112 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2023-12-02 19:12:52,735 INFO L270 PluginConnector]: Initializing Boogie Preprocessor... [2023-12-02 19:12:52,735 INFO L274 PluginConnector]: Boogie Preprocessor initialized [2023-12-02 19:12:52,745 INFO L184 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 07:12:52" (1/1) ... [2023-12-02 19:12:52,745 INFO L184 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 07:12:52" (1/1) ... [2023-12-02 19:12:52,747 INFO L184 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 07:12:52" (1/1) ... [2023-12-02 19:12:52,747 INFO L184 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 07:12:52" (1/1) ... [2023-12-02 19:12:52,750 INFO L184 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 07:12:52" (1/1) ... [2023-12-02 19:12:52,754 INFO L184 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 07:12:52" (1/1) ... [2023-12-02 19:12:52,756 INFO L184 PluginConnector]: Executing the observer LTLStepAnnotator from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 07:12:52" (1/1) ... [2023-12-02 19:12:52,757 INFO L184 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 07:12:52" (1/1) ... [2023-12-02 19:12:52,759 INFO L131 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2023-12-02 19:12:52,760 INFO L112 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2023-12-02 19:12:52,760 INFO L270 PluginConnector]: Initializing RCFGBuilder... [2023-12-02 19:12:52,760 INFO L274 PluginConnector]: RCFGBuilder initialized [2023-12-02 19:12:52,761 INFO L184 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 07:12:52" (1/1) ... [2023-12-02 19:12:52,766 INFO L173 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2023-12-02 19:12:52,776 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_da5dfcc8-f7a4-4d22-a963-15355fed9e59/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 19:12:52,788 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_da5dfcc8-f7a4-4d22-a963-15355fed9e59/bin/utaipan-verify-nQ1chXbOIh/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2023-12-02 19:12:52,790 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_da5dfcc8-f7a4-4d22-a963-15355fed9e59/bin/utaipan-verify-nQ1chXbOIh/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2023-12-02 19:12:52,825 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2023-12-02 19:12:52,826 INFO L130 BoogieDeclarations]: Found specification of procedure assume_abort_if_not [2023-12-02 19:12:52,826 INFO L138 BoogieDeclarations]: Found implementation of procedure assume_abort_if_not [2023-12-02 19:12:52,826 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2023-12-02 19:12:52,826 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2023-12-02 19:12:52,826 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2023-12-02 19:12:52,826 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2023-12-02 19:12:52,827 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2023-12-02 19:12:52,885 INFO L241 CfgBuilder]: Building ICFG [2023-12-02 19:12:52,887 INFO L267 CfgBuilder]: Building CFG for each procedure with an implementation [2023-12-02 19:12:53,034 INFO L282 CfgBuilder]: Performing block encoding [2023-12-02 19:12:53,064 INFO L304 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2023-12-02 19:12:53,064 INFO L309 CfgBuilder]: Removed 3 assume(true) statements. [2023-12-02 19:12:53,066 INFO L201 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 02.12 07:12:53 BoogieIcfgContainer [2023-12-02 19:12:53,066 INFO L131 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2023-12-02 19:12:53,069 INFO L112 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2023-12-02 19:12:53,069 INFO L270 PluginConnector]: Initializing TraceAbstraction... [2023-12-02 19:12:53,072 INFO L274 PluginConnector]: TraceAbstraction initialized [2023-12-02 19:12:53,073 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 02.12 07:12:52" (1/3) ... [2023-12-02 19:12:53,073 INFO L204 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@ecc3c4b and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 02.12 07:12:53, skipping insertion in model container [2023-12-02 19:12:53,074 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 07:12:52" (2/3) ... [2023-12-02 19:12:53,074 INFO L204 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@ecc3c4b and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 02.12 07:12:53, skipping insertion in model container [2023-12-02 19:12:53,074 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 02.12 07:12:53" (3/3) ... [2023-12-02 19:12:53,076 INFO L112 eAbstractionObserver]: Analyzing ICFG egcd3-ll_valuebound10.c [2023-12-02 19:12:53,095 INFO L203 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2023-12-02 19:12:53,095 INFO L162 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2023-12-02 19:12:53,136 INFO L356 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2023-12-02 19:12:53,142 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;@3ef8586e, mLbeIndependenceSettings=[IndependenceType=SEMANTIC, AbstractionType=NONE, UseConditional=false, UseSemiCommutativity=true, Solver=Z3, SolverTimeout=1000ms] [2023-12-02 19:12:53,142 INFO L358 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2023-12-02 19:12:53,146 INFO L276 IsEmpty]: Start isEmpty. Operand has 30 states, 17 states have (on average 1.4705882352941178) internal successors, (25), 18 states have internal predecessors, (25), 9 states have call successors, (9), 2 states have call predecessors, (9), 2 states have return successors, (9), 9 states have call predecessors, (9), 9 states have call successors, (9) [2023-12-02 19:12:53,153 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2023-12-02 19:12:53,153 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 19:12:53,154 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 19:12:53,155 INFO L420 AbstractCegarLoop]: === Iteration 1 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 19:12:53,160 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 19:12:53,160 INFO L85 PathProgramCache]: Analyzing trace with hash 1539547475, now seen corresponding path program 1 times [2023-12-02 19:12:53,170 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 19:12:53,170 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1459131234] [2023-12-02 19:12:53,171 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 19:12:53,171 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 19:12:53,278 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 19:12:53,310 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 19:12:53,311 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1459131234] [2023-12-02 19:12:53,311 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unsupported non-linear arithmetic [2023-12-02 19:12:53,312 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1471951934] [2023-12-02 19:12:53,312 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 19:12:53,312 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 19:12:53,313 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_da5dfcc8-f7a4-4d22-a963-15355fed9e59/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 19:12:53,319 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_da5dfcc8-f7a4-4d22-a963-15355fed9e59/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 19:12:53,320 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_da5dfcc8-f7a4-4d22-a963-15355fed9e59/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2023-12-02 19:12:53,392 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 19:12:53,394 INFO L262 TraceCheckSpWp]: Trace formula consists of 79 conjuncts, 1 conjunts are in the unsatisfiable core [2023-12-02 19:12:53,400 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 19:12:53,425 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 19:12:53,425 INFO L323 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2023-12-02 19:12:53,426 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1471951934] provided 1 perfect and 0 imperfect interpolant sequences [2023-12-02 19:12:53,426 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-12-02 19:12:53,426 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2023-12-02 19:12:53,429 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1562387479] [2023-12-02 19:12:53,429 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-12-02 19:12:53,434 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 2 states [2023-12-02 19:12:53,434 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 19:12:53,482 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 2 interpolants. [2023-12-02 19:12:53,482 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2023-12-02 19:12:53,486 INFO L87 Difference]: Start difference. First operand has 30 states, 17 states have (on average 1.4705882352941178) internal successors, (25), 18 states have internal predecessors, (25), 9 states have call successors, (9), 2 states have call predecessors, (9), 2 states have return successors, (9), 9 states have call predecessors, (9), 9 states have call successors, (9) Second operand has 2 states, 2 states have (on average 4.0) internal successors, (8), 2 states have internal predecessors, (8), 2 states have call successors, (5), 2 states have call predecessors, (5), 1 states have return successors, (4), 1 states have call predecessors, (4), 1 states have call successors, (4) [2023-12-02 19:12:53,515 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 19:12:53,516 INFO L93 Difference]: Finished difference Result 51 states and 79 transitions. [2023-12-02 19:12:53,517 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2023-12-02 19:12:53,518 INFO L78 Accepts]: Start accepts. Automaton has has 2 states, 2 states have (on average 4.0) internal successors, (8), 2 states have internal predecessors, (8), 2 states have call successors, (5), 2 states have call predecessors, (5), 1 states have return successors, (4), 1 states have call predecessors, (4), 1 states have call successors, (4) Word has length 20 [2023-12-02 19:12:53,519 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 19:12:53,525 INFO L225 Difference]: With dead ends: 51 [2023-12-02 19:12:53,526 INFO L226 Difference]: Without dead ends: 28 [2023-12-02 19:12:53,529 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 19 GetRequests, 19 SyntacticMatches, 0 SemanticMatches, 0 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2023-12-02 19:12:53,532 INFO L413 NwaCegarLoop]: 36 mSDtfsCounter, 0 mSDsluCounter, 0 mSDsCounter, 0 mSdLazyCounter, 3 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 36 SdHoareTripleChecker+Invalid, 5 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 3 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2023-12-02 19:12:53,533 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [0 Valid, 36 Invalid, 5 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 3 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2023-12-02 19:12:53,550 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 28 states. [2023-12-02 19:12:53,567 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 28 to 28. [2023-12-02 19:12:53,568 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 28 states, 16 states have (on average 1.25) internal successors, (20), 17 states have internal predecessors, (20), 9 states have call successors, (9), 2 states have call predecessors, (9), 2 states have return successors, (8), 8 states have call predecessors, (8), 8 states have call successors, (8) [2023-12-02 19:12:53,570 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 28 states to 28 states and 37 transitions. [2023-12-02 19:12:53,571 INFO L78 Accepts]: Start accepts. Automaton has 28 states and 37 transitions. Word has length 20 [2023-12-02 19:12:53,572 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 19:12:53,572 INFO L495 AbstractCegarLoop]: Abstraction has 28 states and 37 transitions. [2023-12-02 19:12:53,573 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 2 states, 2 states have (on average 4.0) internal successors, (8), 2 states have internal predecessors, (8), 2 states have call successors, (5), 2 states have call predecessors, (5), 1 states have return successors, (4), 1 states have call predecessors, (4), 1 states have call successors, (4) [2023-12-02 19:12:53,573 INFO L276 IsEmpty]: Start isEmpty. Operand 28 states and 37 transitions. [2023-12-02 19:12:53,574 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2023-12-02 19:12:53,574 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 19:12:53,574 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 19:12:53,586 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_da5dfcc8-f7a4-4d22-a963-15355fed9e59/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0 [2023-12-02 19:12:53,775 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_da5dfcc8-f7a4-4d22-a963-15355fed9e59/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable0 [2023-12-02 19:12:53,776 INFO L420 AbstractCegarLoop]: === Iteration 2 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 19:12:53,776 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 19:12:53,776 INFO L85 PathProgramCache]: Analyzing trace with hash 1863391506, now seen corresponding path program 1 times [2023-12-02 19:12:53,776 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 19:12:53,776 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [724275186] [2023-12-02 19:12:53,777 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 19:12:53,777 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 19:12:53,790 ERROR L246 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2023-12-02 19:12:53,790 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [985880430] [2023-12-02 19:12:53,791 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 19:12:53,791 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 19:12:53,791 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_da5dfcc8-f7a4-4d22-a963-15355fed9e59/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 19:12:53,792 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_da5dfcc8-f7a4-4d22-a963-15355fed9e59/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 19:12:53,793 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_da5dfcc8-f7a4-4d22-a963-15355fed9e59/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2023-12-02 19:12:53,850 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 19:12:53,851 INFO L262 TraceCheckSpWp]: Trace formula consists of 81 conjuncts, 7 conjunts are in the unsatisfiable core [2023-12-02 19:12:53,853 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 19:12:53,906 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 3 proven. 0 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2023-12-02 19:12:53,906 INFO L323 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2023-12-02 19:12:53,907 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 19:12:53,907 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [724275186] [2023-12-02 19:12:53,907 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2023-12-02 19:12:53,907 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [985880430] [2023-12-02 19:12:53,907 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [985880430] provided 1 perfect and 0 imperfect interpolant sequences [2023-12-02 19:12:53,908 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-12-02 19:12:53,908 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2023-12-02 19:12:53,908 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1138446613] [2023-12-02 19:12:53,908 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-12-02 19:12:53,909 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2023-12-02 19:12:53,909 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 19:12:53,910 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2023-12-02 19:12:53,910 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2023-12-02 19:12:53,910 INFO L87 Difference]: Start difference. First operand 28 states and 37 transitions. Second operand has 5 states, 4 states have (on average 2.5) internal successors, (10), 4 states have internal predecessors, (10), 2 states have call successors, (5), 2 states have call predecessors, (5), 2 states have return successors, (4), 2 states have call predecessors, (4), 1 states have call successors, (4) [2023-12-02 19:12:53,987 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 19:12:53,987 INFO L93 Difference]: Finished difference Result 47 states and 62 transitions. [2023-12-02 19:12:53,987 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2023-12-02 19:12:53,988 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 4 states have (on average 2.5) internal successors, (10), 4 states have internal predecessors, (10), 2 states have call successors, (5), 2 states have call predecessors, (5), 2 states have return successors, (4), 2 states have call predecessors, (4), 1 states have call successors, (4) Word has length 21 [2023-12-02 19:12:53,988 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 19:12:53,989 INFO L225 Difference]: With dead ends: 47 [2023-12-02 19:12:53,989 INFO L226 Difference]: Without dead ends: 40 [2023-12-02 19:12:53,990 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 21 GetRequests, 17 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2023-12-02 19:12:53,991 INFO L413 NwaCegarLoop]: 26 mSDtfsCounter, 30 mSDsluCounter, 61 mSDsCounter, 0 mSdLazyCounter, 42 mSolverCounterSat, 8 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 34 SdHoareTripleChecker+Valid, 87 SdHoareTripleChecker+Invalid, 50 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 8 IncrementalHoareTripleChecker+Valid, 42 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-12-02 19:12:53,992 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [34 Valid, 87 Invalid, 50 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [8 Valid, 42 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-12-02 19:12:53,993 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 40 states. [2023-12-02 19:12:54,000 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 40 to 30. [2023-12-02 19:12:54,001 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 30 states, 18 states have (on average 1.2222222222222223) internal successors, (22), 19 states have internal predecessors, (22), 9 states have call successors, (9), 2 states have call predecessors, (9), 2 states have return successors, (8), 8 states have call predecessors, (8), 8 states have call successors, (8) [2023-12-02 19:12:54,002 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 30 states to 30 states and 39 transitions. [2023-12-02 19:12:54,002 INFO L78 Accepts]: Start accepts. Automaton has 30 states and 39 transitions. Word has length 21 [2023-12-02 19:12:54,002 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 19:12:54,002 INFO L495 AbstractCegarLoop]: Abstraction has 30 states and 39 transitions. [2023-12-02 19:12:54,003 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 4 states have (on average 2.5) internal successors, (10), 4 states have internal predecessors, (10), 2 states have call successors, (5), 2 states have call predecessors, (5), 2 states have return successors, (4), 2 states have call predecessors, (4), 1 states have call successors, (4) [2023-12-02 19:12:54,003 INFO L276 IsEmpty]: Start isEmpty. Operand 30 states and 39 transitions. [2023-12-02 19:12:54,004 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2023-12-02 19:12:54,004 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 19:12:54,004 INFO L195 NwaCegarLoop]: trace histogram [4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-12-02 19:12:54,009 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_da5dfcc8-f7a4-4d22-a963-15355fed9e59/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Forceful destruction successful, exit code 0 [2023-12-02 19:12:54,207 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1,3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_da5dfcc8-f7a4-4d22-a963-15355fed9e59/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 19:12:54,207 INFO L420 AbstractCegarLoop]: === Iteration 3 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 19:12:54,208 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 19:12:54,208 INFO L85 PathProgramCache]: Analyzing trace with hash -73319670, now seen corresponding path program 1 times [2023-12-02 19:12:54,208 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 19:12:54,208 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1051601782] [2023-12-02 19:12:54,208 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 19:12:54,209 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 19:12:54,227 ERROR L246 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2023-12-02 19:12:54,227 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1547146328] [2023-12-02 19:12:54,227 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 19:12:54,227 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 19:12:54,227 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_da5dfcc8-f7a4-4d22-a963-15355fed9e59/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 19:12:54,228 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_da5dfcc8-f7a4-4d22-a963-15355fed9e59/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 19:12:54,232 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_da5dfcc8-f7a4-4d22-a963-15355fed9e59/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2023-12-02 19:12:54,283 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 19:12:54,284 INFO L262 TraceCheckSpWp]: Trace formula consists of 91 conjuncts, 17 conjunts are in the unsatisfiable core [2023-12-02 19:12:54,287 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 19:12:54,417 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 3 proven. 0 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2023-12-02 19:12:54,417 INFO L323 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2023-12-02 19:12:54,418 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 19:12:54,418 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1051601782] [2023-12-02 19:12:54,418 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2023-12-02 19:12:54,418 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1547146328] [2023-12-02 19:12:54,418 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1547146328] provided 1 perfect and 0 imperfect interpolant sequences [2023-12-02 19:12:54,419 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-12-02 19:12:54,419 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [7] imperfect sequences [] total 7 [2023-12-02 19:12:54,419 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [893611772] [2023-12-02 19:12:54,419 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-12-02 19:12:54,419 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2023-12-02 19:12:54,420 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 19:12:54,420 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2023-12-02 19:12:54,420 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=12, Invalid=30, Unknown=0, NotChecked=0, Total=42 [2023-12-02 19:12:54,421 INFO L87 Difference]: Start difference. First operand 30 states and 39 transitions. Second operand has 7 states, 6 states have (on average 2.1666666666666665) internal successors, (13), 5 states have internal predecessors, (13), 2 states have call successors, (5), 2 states have call predecessors, (5), 2 states have return successors, (4), 2 states have call predecessors, (4), 1 states have call successors, (4) [2023-12-02 19:12:54,516 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 19:12:54,516 INFO L93 Difference]: Finished difference Result 46 states and 60 transitions. [2023-12-02 19:12:54,517 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2023-12-02 19:12:54,517 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 6 states have (on average 2.1666666666666665) internal successors, (13), 5 states have internal predecessors, (13), 2 states have call successors, (5), 2 states have call predecessors, (5), 2 states have return successors, (4), 2 states have call predecessors, (4), 1 states have call successors, (4) Word has length 24 [2023-12-02 19:12:54,517 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 19:12:54,518 INFO L225 Difference]: With dead ends: 46 [2023-12-02 19:12:54,518 INFO L226 Difference]: Without dead ends: 44 [2023-12-02 19:12:54,519 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 24 GetRequests, 18 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=16, Invalid=40, Unknown=0, NotChecked=0, Total=56 [2023-12-02 19:12:54,520 INFO L413 NwaCegarLoop]: 25 mSDtfsCounter, 25 mSDsluCounter, 87 mSDsCounter, 0 mSdLazyCounter, 71 mSolverCounterSat, 4 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 33 SdHoareTripleChecker+Valid, 112 SdHoareTripleChecker+Invalid, 75 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 4 IncrementalHoareTripleChecker+Valid, 71 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-12-02 19:12:54,520 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [33 Valid, 112 Invalid, 75 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [4 Valid, 71 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-12-02 19:12:54,521 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 44 states. [2023-12-02 19:12:54,531 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 44 to 43. [2023-12-02 19:12:54,531 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 43 states, 26 states have (on average 1.2307692307692308) internal successors, (32), 27 states have internal predecessors, (32), 13 states have call successors, (13), 3 states have call predecessors, (13), 3 states have return successors, (12), 12 states have call predecessors, (12), 12 states have call successors, (12) [2023-12-02 19:12:54,532 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 43 states to 43 states and 57 transitions. [2023-12-02 19:12:54,533 INFO L78 Accepts]: Start accepts. Automaton has 43 states and 57 transitions. Word has length 24 [2023-12-02 19:12:54,533 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 19:12:54,533 INFO L495 AbstractCegarLoop]: Abstraction has 43 states and 57 transitions. [2023-12-02 19:12:54,533 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 6 states have (on average 2.1666666666666665) internal successors, (13), 5 states have internal predecessors, (13), 2 states have call successors, (5), 2 states have call predecessors, (5), 2 states have return successors, (4), 2 states have call predecessors, (4), 1 states have call successors, (4) [2023-12-02 19:12:54,533 INFO L276 IsEmpty]: Start isEmpty. Operand 43 states and 57 transitions. [2023-12-02 19:12:54,534 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2023-12-02 19:12:54,534 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 19:12:54,535 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 19:12:54,540 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_da5dfcc8-f7a4-4d22-a963-15355fed9e59/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Forceful destruction successful, exit code 0 [2023-12-02 19:12:54,739 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2,4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_da5dfcc8-f7a4-4d22-a963-15355fed9e59/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 19:12:54,739 INFO L420 AbstractCegarLoop]: === Iteration 4 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 19:12:54,740 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 19:12:54,740 INFO L85 PathProgramCache]: Analyzing trace with hash -1101454984, now seen corresponding path program 1 times [2023-12-02 19:12:54,740 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 19:12:54,740 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1378200642] [2023-12-02 19:12:54,740 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 19:12:54,740 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 19:12:54,756 ERROR L246 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2023-12-02 19:12:54,756 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1012609381] [2023-12-02 19:12:54,756 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 19:12:54,756 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 19:12:54,757 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_da5dfcc8-f7a4-4d22-a963-15355fed9e59/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 19:12:54,757 INFO L229 MonitoredProcess]: Starting monitored process 5 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_da5dfcc8-f7a4-4d22-a963-15355fed9e59/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 19:12:54,758 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_da5dfcc8-f7a4-4d22-a963-15355fed9e59/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2023-12-02 19:12:54,807 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 19:12:54,808 INFO L262 TraceCheckSpWp]: Trace formula consists of 101 conjuncts, 9 conjunts are in the unsatisfiable core [2023-12-02 19:12:54,810 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 19:12:54,855 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 19:12:54,856 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-12-02 19:12:54,928 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 19:12:54,928 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 19:12:54,928 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1378200642] [2023-12-02 19:12:54,928 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2023-12-02 19:12:54,928 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1012609381] [2023-12-02 19:12:54,928 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1012609381] provided 0 perfect and 2 imperfect interpolant sequences [2023-12-02 19:12:54,929 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1778950936] [2023-12-02 19:12:54,947 INFO L159 IcfgInterpreter]: Started Sifa with 19 locations of interest [2023-12-02 19:12:54,947 INFO L166 IcfgInterpreter]: Building call graph [2023-12-02 19:12:54,950 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-12-02 19:12:54,954 INFO L176 IcfgInterpreter]: Starting interpretation [2023-12-02 19:12:54,955 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-12-02 19:12:56,111 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 3 for LOIs [2023-12-02 19:12:56,113 INFO L180 IcfgInterpreter]: Interpretation finished [2023-12-02 19:12:57,021 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSifa [1778950936] provided 1 perfect and 0 imperfect interpolant sequences [2023-12-02 19:12:57,022 INFO L185 FreeRefinementEngine]: Found 1 perfect and 2 imperfect interpolant sequences. [2023-12-02 19:12:57,022 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [12] imperfect sequences [7, 7] total 18 [2023-12-02 19:12:57,022 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [382846532] [2023-12-02 19:12:57,023 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-12-02 19:12:57,023 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 13 states [2023-12-02 19:12:57,023 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 19:12:57,024 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2023-12-02 19:12:57,025 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=93, Invalid=213, Unknown=0, NotChecked=0, Total=306 [2023-12-02 19:12:57,025 INFO L87 Difference]: Start difference. First operand 43 states and 57 transitions. Second operand has 13 states, 8 states have (on average 1.625) internal successors, (13), 7 states have internal predecessors, (13), 5 states have call successors, (5), 2 states have call predecessors, (5), 1 states have return successors, (4), 4 states have call predecessors, (4), 4 states have call successors, (4) [2023-12-02 19:12:57,299 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 19:12:57,299 INFO L93 Difference]: Finished difference Result 81 states and 113 transitions. [2023-12-02 19:12:57,299 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2023-12-02 19:12:57,300 INFO L78 Accepts]: Start accepts. Automaton has has 13 states, 8 states have (on average 1.625) internal successors, (13), 7 states have internal predecessors, (13), 5 states have call successors, (5), 2 states have call predecessors, (5), 1 states have return successors, (4), 4 states have call predecessors, (4), 4 states have call successors, (4) Word has length 26 [2023-12-02 19:12:57,300 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 19:12:57,301 INFO L225 Difference]: With dead ends: 81 [2023-12-02 19:12:57,302 INFO L226 Difference]: Without dead ends: 74 [2023-12-02 19:12:57,302 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 76 GetRequests, 56 SyntacticMatches, 4 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 25 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=93, Invalid=213, Unknown=0, NotChecked=0, Total=306 [2023-12-02 19:12:57,303 INFO L413 NwaCegarLoop]: 19 mSDtfsCounter, 54 mSDsluCounter, 26 mSDsCounter, 0 mSdLazyCounter, 101 mSolverCounterSat, 26 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 66 SdHoareTripleChecker+Valid, 45 SdHoareTripleChecker+Invalid, 127 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 26 IncrementalHoareTripleChecker+Valid, 101 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2023-12-02 19:12:57,304 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [66 Valid, 45 Invalid, 127 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [26 Valid, 101 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2023-12-02 19:12:57,305 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 74 states. [2023-12-02 19:12:57,341 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 74 to 50. [2023-12-02 19:12:57,341 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 50 states, 33 states have (on average 1.2424242424242424) internal successors, (41), 34 states have internal predecessors, (41), 13 states have call successors, (13), 3 states have call predecessors, (13), 3 states have return successors, (12), 12 states have call predecessors, (12), 12 states have call successors, (12) [2023-12-02 19:12:57,342 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 50 states to 50 states and 66 transitions. [2023-12-02 19:12:57,343 INFO L78 Accepts]: Start accepts. Automaton has 50 states and 66 transitions. Word has length 26 [2023-12-02 19:12:57,343 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 19:12:57,343 INFO L495 AbstractCegarLoop]: Abstraction has 50 states and 66 transitions. [2023-12-02 19:12:57,344 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 13 states, 8 states have (on average 1.625) internal successors, (13), 7 states have internal predecessors, (13), 5 states have call successors, (5), 2 states have call predecessors, (5), 1 states have return successors, (4), 4 states have call predecessors, (4), 4 states have call successors, (4) [2023-12-02 19:12:57,344 INFO L276 IsEmpty]: Start isEmpty. Operand 50 states and 66 transitions. [2023-12-02 19:12:57,345 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 30 [2023-12-02 19:12:57,345 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 19:12:57,345 INFO L195 NwaCegarLoop]: trace histogram [4, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-12-02 19:12:57,349 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_da5dfcc8-f7a4-4d22-a963-15355fed9e59/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Ended with exit code 0 [2023-12-02 19:12:57,547 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3,5 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_da5dfcc8-f7a4-4d22-a963-15355fed9e59/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 19:12:57,547 INFO L420 AbstractCegarLoop]: === Iteration 5 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 19:12:57,548 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 19:12:57,548 INFO L85 PathProgramCache]: Analyzing trace with hash -156943002, now seen corresponding path program 1 times [2023-12-02 19:12:57,548 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 19:12:57,548 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1175854549] [2023-12-02 19:12:57,548 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 19:12:57,548 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 19:12:57,561 ERROR L246 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2023-12-02 19:12:57,562 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1776957400] [2023-12-02 19:12:57,562 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 19:12:57,562 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 19:12:57,562 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_da5dfcc8-f7a4-4d22-a963-15355fed9e59/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 19:12:57,563 INFO L229 MonitoredProcess]: Starting monitored process 6 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_da5dfcc8-f7a4-4d22-a963-15355fed9e59/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 19:12:57,571 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_da5dfcc8-f7a4-4d22-a963-15355fed9e59/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2023-12-02 19:12:57,611 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 19:12:57,612 INFO L262 TraceCheckSpWp]: Trace formula consists of 100 conjuncts, 27 conjunts are in the unsatisfiable core [2023-12-02 19:12:57,615 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 19:12:57,771 INFO L134 CoverageAnalysis]: Checked inductivity of 14 backedges. 2 proven. 4 refuted. 0 times theorem prover too weak. 8 trivial. 0 not checked. [2023-12-02 19:12:57,772 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-12-02 19:12:57,871 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 19:12:57,871 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 19:12:57,871 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1175854549] [2023-12-02 19:12:57,871 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2023-12-02 19:12:57,872 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1776957400] [2023-12-02 19:12:57,872 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1776957400] provided 1 perfect and 1 imperfect interpolant sequences [2023-12-02 19:12:57,872 INFO L185 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2023-12-02 19:12:57,872 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [10] total 12 [2023-12-02 19:12:57,872 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [701940966] [2023-12-02 19:12:57,872 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-12-02 19:12:57,873 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2023-12-02 19:12:57,873 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 19:12:57,873 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2023-12-02 19:12:57,873 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=27, Invalid=105, Unknown=0, NotChecked=0, Total=132 [2023-12-02 19:12:57,874 INFO L87 Difference]: Start difference. First operand 50 states and 66 transitions. Second operand has 5 states, 5 states have (on average 3.0) internal successors, (15), 4 states have internal predecessors, (15), 2 states have call successors, (6), 2 states have call predecessors, (6), 1 states have return successors, (5), 2 states have call predecessors, (5), 2 states have call successors, (5) [2023-12-02 19:12:57,956 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 19:12:57,956 INFO L93 Difference]: Finished difference Result 58 states and 73 transitions. [2023-12-02 19:12:57,959 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2023-12-02 19:12:57,959 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 3.0) internal successors, (15), 4 states have internal predecessors, (15), 2 states have call successors, (6), 2 states have call predecessors, (6), 1 states have return successors, (5), 2 states have call predecessors, (5), 2 states have call successors, (5) Word has length 29 [2023-12-02 19:12:57,960 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 19:12:57,960 INFO L225 Difference]: With dead ends: 58 [2023-12-02 19:12:57,961 INFO L226 Difference]: Without dead ends: 56 [2023-12-02 19:12:57,961 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 57 GetRequests, 46 SyntacticMatches, 0 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 18 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=31, Invalid=125, Unknown=0, NotChecked=0, Total=156 [2023-12-02 19:12:57,962 INFO L413 NwaCegarLoop]: 31 mSDtfsCounter, 8 mSDsluCounter, 79 mSDsCounter, 0 mSdLazyCounter, 41 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 11 SdHoareTripleChecker+Valid, 110 SdHoareTripleChecker+Invalid, 42 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 41 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-12-02 19:12:57,962 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [11 Valid, 110 Invalid, 42 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 41 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-12-02 19:12:57,963 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 56 states. [2023-12-02 19:12:57,983 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 56 to 54. [2023-12-02 19:12:57,983 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 54 states, 36 states have (on average 1.2222222222222223) internal successors, (44), 37 states have internal predecessors, (44), 13 states have call successors, (13), 4 states have call predecessors, (13), 4 states have return successors, (12), 12 states have call predecessors, (12), 12 states have call successors, (12) [2023-12-02 19:12:57,984 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 54 states to 54 states and 69 transitions. [2023-12-02 19:12:57,984 INFO L78 Accepts]: Start accepts. Automaton has 54 states and 69 transitions. Word has length 29 [2023-12-02 19:12:57,985 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 19:12:57,985 INFO L495 AbstractCegarLoop]: Abstraction has 54 states and 69 transitions. [2023-12-02 19:12:57,985 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 3.0) internal successors, (15), 4 states have internal predecessors, (15), 2 states have call successors, (6), 2 states have call predecessors, (6), 1 states have return successors, (5), 2 states have call predecessors, (5), 2 states have call successors, (5) [2023-12-02 19:12:57,985 INFO L276 IsEmpty]: Start isEmpty. Operand 54 states and 69 transitions. [2023-12-02 19:12:57,986 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 30 [2023-12-02 19:12:57,986 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 19:12:57,986 INFO L195 NwaCegarLoop]: trace histogram [4, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-12-02 19:12:57,991 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_da5dfcc8-f7a4-4d22-a963-15355fed9e59/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Ended with exit code 0 [2023-12-02 19:12:58,187 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,6 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_da5dfcc8-f7a4-4d22-a963-15355fed9e59/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 19:12:58,187 INFO L420 AbstractCegarLoop]: === Iteration 6 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 19:12:58,187 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 19:12:58,187 INFO L85 PathProgramCache]: Analyzing trace with hash 187338980, now seen corresponding path program 1 times [2023-12-02 19:12:58,187 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 19:12:58,187 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1527261563] [2023-12-02 19:12:58,187 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 19:12:58,188 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 19:12:58,199 ERROR L246 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2023-12-02 19:12:58,199 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [231051567] [2023-12-02 19:12:58,199 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 19:12:58,199 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 19:12:58,199 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_da5dfcc8-f7a4-4d22-a963-15355fed9e59/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 19:12:58,200 INFO L229 MonitoredProcess]: Starting monitored process 7 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_da5dfcc8-f7a4-4d22-a963-15355fed9e59/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 19:12:58,201 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_da5dfcc8-f7a4-4d22-a963-15355fed9e59/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Waiting until timeout for monitored process [2023-12-02 19:12:58,241 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 19:12:58,242 INFO L262 TraceCheckSpWp]: Trace formula consists of 111 conjuncts, 29 conjunts are in the unsatisfiable core [2023-12-02 19:12:58,243 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 19:12:58,391 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 2 proven. 5 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2023-12-02 19:12:58,391 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-12-02 19:12:58,488 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2023-12-02 19:12:58,489 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 19:12:58,489 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1527261563] [2023-12-02 19:12:58,489 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2023-12-02 19:12:58,489 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [231051567] [2023-12-02 19:12:58,489 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [231051567] provided 0 perfect and 2 imperfect interpolant sequences [2023-12-02 19:12:58,489 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [500837267] [2023-12-02 19:12:58,492 INFO L159 IcfgInterpreter]: Started Sifa with 20 locations of interest [2023-12-02 19:12:58,492 INFO L166 IcfgInterpreter]: Building call graph [2023-12-02 19:12:58,493 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-12-02 19:12:58,493 INFO L176 IcfgInterpreter]: Starting interpretation [2023-12-02 19:12:58,493 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-12-02 19:12:59,016 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 84 for LOIs [2023-12-02 19:12:59,120 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 3 for LOIs [2023-12-02 19:12:59,121 INFO L180 IcfgInterpreter]: Interpretation finished [2023-12-02 19:13:00,639 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSifa [500837267] provided 1 perfect and 0 imperfect interpolant sequences [2023-12-02 19:13:00,639 INFO L185 FreeRefinementEngine]: Found 1 perfect and 2 imperfect interpolant sequences. [2023-12-02 19:13:00,639 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [15] imperfect sequences [9, 6] total 27 [2023-12-02 19:13:00,640 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [299075609] [2023-12-02 19:13:00,640 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-12-02 19:13:00,640 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 16 states [2023-12-02 19:13:00,640 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 19:13:00,641 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2023-12-02 19:13:00,641 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=140, Invalid=562, Unknown=0, NotChecked=0, Total=702 [2023-12-02 19:13:00,641 INFO L87 Difference]: Start difference. First operand 54 states and 69 transitions. Second operand has 16 states, 11 states have (on average 1.2727272727272727) internal successors, (14), 9 states have internal predecessors, (14), 5 states have call successors, (5), 2 states have call predecessors, (5), 1 states have return successors, (4), 4 states have call predecessors, (4), 4 states have call successors, (4) [2023-12-02 19:13:01,010 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 19:13:01,011 INFO L93 Difference]: Finished difference Result 98 states and 138 transitions. [2023-12-02 19:13:01,011 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2023-12-02 19:13:01,011 INFO L78 Accepts]: Start accepts. Automaton has has 16 states, 11 states have (on average 1.2727272727272727) internal successors, (14), 9 states have internal predecessors, (14), 5 states have call successors, (5), 2 states have call predecessors, (5), 1 states have return successors, (4), 4 states have call predecessors, (4), 4 states have call successors, (4) Word has length 29 [2023-12-02 19:13:01,012 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 19:13:01,013 INFO L225 Difference]: With dead ends: 98 [2023-12-02 19:13:01,013 INFO L226 Difference]: Without dead ends: 96 [2023-12-02 19:13:01,014 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 85 GetRequests, 60 SyntacticMatches, 0 SemanticMatches, 25 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 159 ImplicationChecksByTransitivity, 1.6s TimeCoverageRelationStatistics Valid=140, Invalid=562, Unknown=0, NotChecked=0, Total=702 [2023-12-02 19:13:01,015 INFO L413 NwaCegarLoop]: 17 mSDtfsCounter, 46 mSDsluCounter, 40 mSDsCounter, 0 mSdLazyCounter, 174 mSolverCounterSat, 35 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 62 SdHoareTripleChecker+Valid, 57 SdHoareTripleChecker+Invalid, 209 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 35 IncrementalHoareTripleChecker+Valid, 174 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2023-12-02 19:13:01,015 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [62 Valid, 57 Invalid, 209 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [35 Valid, 174 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2023-12-02 19:13:01,016 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 96 states. [2023-12-02 19:13:01,060 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 96 to 89. [2023-12-02 19:13:01,061 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 89 states, 50 states have (on average 1.24) internal successors, (62), 53 states have internal predecessors, (62), 33 states have call successors, (33), 5 states have call predecessors, (33), 5 states have return successors, (32), 30 states have call predecessors, (32), 32 states have call successors, (32) [2023-12-02 19:13:01,062 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 89 states to 89 states and 127 transitions. [2023-12-02 19:13:01,062 INFO L78 Accepts]: Start accepts. Automaton has 89 states and 127 transitions. Word has length 29 [2023-12-02 19:13:01,062 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 19:13:01,062 INFO L495 AbstractCegarLoop]: Abstraction has 89 states and 127 transitions. [2023-12-02 19:13:01,063 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 16 states, 11 states have (on average 1.2727272727272727) internal successors, (14), 9 states have internal predecessors, (14), 5 states have call successors, (5), 2 states have call predecessors, (5), 1 states have return successors, (4), 4 states have call predecessors, (4), 4 states have call successors, (4) [2023-12-02 19:13:01,063 INFO L276 IsEmpty]: Start isEmpty. Operand 89 states and 127 transitions. [2023-12-02 19:13:01,064 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 52 [2023-12-02 19:13:01,064 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 19:13:01,065 INFO L195 NwaCegarLoop]: trace histogram [5, 4, 4, 4, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-12-02 19:13:01,069 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_da5dfcc8-f7a4-4d22-a963-15355fed9e59/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Ended with exit code 0 [2023-12-02 19:13:01,265 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5,7 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_da5dfcc8-f7a4-4d22-a963-15355fed9e59/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 19:13:01,265 INFO L420 AbstractCegarLoop]: === Iteration 7 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 19:13:01,265 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 19:13:01,266 INFO L85 PathProgramCache]: Analyzing trace with hash -1193022788, now seen corresponding path program 1 times [2023-12-02 19:13:01,266 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 19:13:01,266 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [794230430] [2023-12-02 19:13:01,266 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 19:13:01,266 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 19:13:01,277 ERROR L246 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2023-12-02 19:13:01,277 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [257917414] [2023-12-02 19:13:01,278 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 19:13:01,278 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 19:13:01,278 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_da5dfcc8-f7a4-4d22-a963-15355fed9e59/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 19:13:01,279 INFO L229 MonitoredProcess]: Starting monitored process 8 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_da5dfcc8-f7a4-4d22-a963-15355fed9e59/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 19:13:01,282 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_da5dfcc8-f7a4-4d22-a963-15355fed9e59/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Waiting until timeout for monitored process [2023-12-02 19:13:01,345 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 19:13:01,347 INFO L262 TraceCheckSpWp]: Trace formula consists of 149 conjuncts, 56 conjunts are in the unsatisfiable core [2023-12-02 19:13:01,351 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 19:13:01,987 INFO L134 CoverageAnalysis]: Checked inductivity of 48 backedges. 12 proven. 12 refuted. 0 times theorem prover too weak. 24 trivial. 0 not checked. [2023-12-02 19:13:01,987 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-12-02 19:13:02,800 INFO L134 CoverageAnalysis]: Checked inductivity of 48 backedges. 10 proven. 11 refuted. 0 times theorem prover too weak. 27 trivial. 0 not checked. [2023-12-02 19:13:02,800 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 19:13:02,800 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [794230430] [2023-12-02 19:13:02,800 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2023-12-02 19:13:02,800 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [257917414] [2023-12-02 19:13:02,801 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [257917414] provided 0 perfect and 2 imperfect interpolant sequences [2023-12-02 19:13:02,801 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [324526735] [2023-12-02 19:13:02,804 INFO L159 IcfgInterpreter]: Started Sifa with 28 locations of interest [2023-12-02 19:13:02,804 INFO L166 IcfgInterpreter]: Building call graph [2023-12-02 19:13:02,804 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-12-02 19:13:02,804 INFO L176 IcfgInterpreter]: Starting interpretation [2023-12-02 19:13:02,805 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-12-02 19:13:06,961 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 1 for LOIs [2023-12-02 19:13:06,965 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 3 for LOIs [2023-12-02 19:13:06,966 INFO L180 IcfgInterpreter]: Interpretation finished [2023-12-02 19:13:08,976 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '2127#(and (= |__VERIFIER_assert_#in~cond| 0) (= __VERIFIER_assert_~cond 0))' at error location [2023-12-02 19:13:08,976 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-12-02 19:13:08,976 INFO L185 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2023-12-02 19:13:08,976 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 13] total 25 [2023-12-02 19:13:08,976 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1459019666] [2023-12-02 19:13:08,976 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2023-12-02 19:13:08,977 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 25 states [2023-12-02 19:13:08,977 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 19:13:08,978 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2023-12-02 19:13:08,979 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=174, Invalid=1548, Unknown=0, NotChecked=0, Total=1722 [2023-12-02 19:13:08,979 INFO L87 Difference]: Start difference. First operand 89 states and 127 transitions. Second operand has 25 states, 22 states have (on average 1.9545454545454546) internal successors, (43), 22 states have internal predecessors, (43), 7 states have call successors, (15), 3 states have call predecessors, (15), 3 states have return successors, (14), 5 states have call predecessors, (14), 5 states have call successors, (14) [2023-12-02 19:13:20,742 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 19:13:20,742 INFO L93 Difference]: Finished difference Result 256 states and 375 transitions. [2023-12-02 19:13:20,743 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 35 states. [2023-12-02 19:13:20,743 INFO L78 Accepts]: Start accepts. Automaton has has 25 states, 22 states have (on average 1.9545454545454546) internal successors, (43), 22 states have internal predecessors, (43), 7 states have call successors, (15), 3 states have call predecessors, (15), 3 states have return successors, (14), 5 states have call predecessors, (14), 5 states have call successors, (14) Word has length 51 [2023-12-02 19:13:20,743 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 19:13:20,746 INFO L225 Difference]: With dead ends: 256 [2023-12-02 19:13:20,746 INFO L226 Difference]: Without dead ends: 218 [2023-12-02 19:13:20,748 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 178 GetRequests, 111 SyntacticMatches, 1 SemanticMatches, 66 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1283 ImplicationChecksByTransitivity, 9.0s TimeCoverageRelationStatistics Valid=583, Invalid=3973, Unknown=0, NotChecked=0, Total=4556 [2023-12-02 19:13:20,749 INFO L413 NwaCegarLoop]: 23 mSDtfsCounter, 149 mSDsluCounter, 317 mSDsCounter, 0 mSdLazyCounter, 711 mSolverCounterSat, 126 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 5.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 155 SdHoareTripleChecker+Valid, 340 SdHoareTripleChecker+Invalid, 837 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 126 IncrementalHoareTripleChecker+Valid, 711 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 5.2s IncrementalHoareTripleChecker+Time [2023-12-02 19:13:20,749 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [155 Valid, 340 Invalid, 837 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [126 Valid, 711 Invalid, 0 Unknown, 0 Unchecked, 5.2s Time] [2023-12-02 19:13:20,750 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 218 states. [2023-12-02 19:13:20,842 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 218 to 161. [2023-12-02 19:13:20,843 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 161 states, 104 states have (on average 1.25) internal successors, (130), 106 states have internal predecessors, (130), 49 states have call successors, (49), 7 states have call predecessors, (49), 7 states have return successors, (48), 47 states have call predecessors, (48), 48 states have call successors, (48) [2023-12-02 19:13:20,845 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 161 states to 161 states and 227 transitions. [2023-12-02 19:13:20,845 INFO L78 Accepts]: Start accepts. Automaton has 161 states and 227 transitions. Word has length 51 [2023-12-02 19:13:20,846 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 19:13:20,846 INFO L495 AbstractCegarLoop]: Abstraction has 161 states and 227 transitions. [2023-12-02 19:13:20,846 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 25 states, 22 states have (on average 1.9545454545454546) internal successors, (43), 22 states have internal predecessors, (43), 7 states have call successors, (15), 3 states have call predecessors, (15), 3 states have return successors, (14), 5 states have call predecessors, (14), 5 states have call successors, (14) [2023-12-02 19:13:20,846 INFO L276 IsEmpty]: Start isEmpty. Operand 161 states and 227 transitions. [2023-12-02 19:13:20,849 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 62 [2023-12-02 19:13:20,849 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 19:13:20,849 INFO L195 NwaCegarLoop]: trace histogram [8, 7, 7, 4, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-12-02 19:13:20,855 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_da5dfcc8-f7a4-4d22-a963-15355fed9e59/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Ended with exit code 0 [2023-12-02 19:13:21,055 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6,8 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_da5dfcc8-f7a4-4d22-a963-15355fed9e59/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 19:13:21,055 INFO L420 AbstractCegarLoop]: === Iteration 8 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 19:13:21,055 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 19:13:21,055 INFO L85 PathProgramCache]: Analyzing trace with hash 1047855047, now seen corresponding path program 1 times [2023-12-02 19:13:21,055 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 19:13:21,056 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [320110154] [2023-12-02 19:13:21,056 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 19:13:21,056 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 19:13:21,066 ERROR L246 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2023-12-02 19:13:21,066 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [499533031] [2023-12-02 19:13:21,066 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 19:13:21,067 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 19:13:21,067 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_da5dfcc8-f7a4-4d22-a963-15355fed9e59/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 19:13:21,068 INFO L229 MonitoredProcess]: Starting monitored process 9 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_da5dfcc8-f7a4-4d22-a963-15355fed9e59/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 19:13:21,069 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_da5dfcc8-f7a4-4d22-a963-15355fed9e59/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Waiting until timeout for monitored process [2023-12-02 19:13:21,126 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 19:13:21,128 INFO L262 TraceCheckSpWp]: Trace formula consists of 160 conjuncts, 24 conjunts are in the unsatisfiable core [2023-12-02 19:13:21,130 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 19:13:21,257 INFO L134 CoverageAnalysis]: Checked inductivity of 115 backedges. 25 proven. 15 refuted. 0 times theorem prover too weak. 75 trivial. 0 not checked. [2023-12-02 19:13:21,257 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-12-02 19:13:21,342 INFO L134 CoverageAnalysis]: Checked inductivity of 115 backedges. 27 proven. 10 refuted. 0 times theorem prover too weak. 78 trivial. 0 not checked. [2023-12-02 19:13:21,342 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 19:13:21,342 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [320110154] [2023-12-02 19:13:21,343 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2023-12-02 19:13:21,343 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [499533031] [2023-12-02 19:13:21,343 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [499533031] provided 0 perfect and 2 imperfect interpolant sequences [2023-12-02 19:13:21,343 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1577067324] [2023-12-02 19:13:21,346 INFO L159 IcfgInterpreter]: Started Sifa with 25 locations of interest [2023-12-02 19:13:21,346 INFO L166 IcfgInterpreter]: Building call graph [2023-12-02 19:13:21,346 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-12-02 19:13:21,346 INFO L176 IcfgInterpreter]: Starting interpretation [2023-12-02 19:13:21,346 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-12-02 19:13:24,307 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 1 for LOIs [2023-12-02 19:13:24,310 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 3 for LOIs [2023-12-02 19:13:24,311 INFO L180 IcfgInterpreter]: Interpretation finished [2023-12-02 19:13:25,175 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '3230#(and (= |__VERIFIER_assert_#in~cond| 0) (= __VERIFIER_assert_~cond 0))' at error location [2023-12-02 19:13:25,175 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-12-02 19:13:25,175 INFO L185 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2023-12-02 19:13:25,175 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 6] total 15 [2023-12-02 19:13:25,176 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1003818484] [2023-12-02 19:13:25,176 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2023-12-02 19:13:25,176 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 15 states [2023-12-02 19:13:25,176 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 19:13:25,177 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2023-12-02 19:13:25,178 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=130, Invalid=740, Unknown=0, NotChecked=0, Total=870 [2023-12-02 19:13:25,178 INFO L87 Difference]: Start difference. First operand 161 states and 227 transitions. Second operand has 15 states, 14 states have (on average 2.357142857142857) internal successors, (33), 12 states have internal predecessors, (33), 4 states have call successors, (20), 3 states have call predecessors, (20), 3 states have return successors, (19), 6 states have call predecessors, (19), 4 states have call successors, (19) [2023-12-02 19:13:25,507 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 19:13:25,508 INFO L93 Difference]: Finished difference Result 198 states and 276 transitions. [2023-12-02 19:13:25,508 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2023-12-02 19:13:25,508 INFO L78 Accepts]: Start accepts. Automaton has has 15 states, 14 states have (on average 2.357142857142857) internal successors, (33), 12 states have internal predecessors, (33), 4 states have call successors, (20), 3 states have call predecessors, (20), 3 states have return successors, (19), 6 states have call predecessors, (19), 4 states have call successors, (19) Word has length 61 [2023-12-02 19:13:25,509 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 19:13:25,511 INFO L225 Difference]: With dead ends: 198 [2023-12-02 19:13:25,511 INFO L226 Difference]: Without dead ends: 196 [2023-12-02 19:13:25,512 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 193 GetRequests, 158 SyntacticMatches, 1 SemanticMatches, 34 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 315 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=178, Invalid=1082, Unknown=0, NotChecked=0, Total=1260 [2023-12-02 19:13:25,513 INFO L413 NwaCegarLoop]: 23 mSDtfsCounter, 51 mSDsluCounter, 116 mSDsCounter, 0 mSdLazyCounter, 199 mSolverCounterSat, 23 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 51 SdHoareTripleChecker+Valid, 139 SdHoareTripleChecker+Invalid, 222 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 23 IncrementalHoareTripleChecker+Valid, 199 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-12-02 19:13:25,513 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [51 Valid, 139 Invalid, 222 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [23 Valid, 199 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-12-02 19:13:25,514 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 196 states. [2023-12-02 19:13:25,599 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 196 to 173. [2023-12-02 19:13:25,600 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 173 states, 113 states have (on average 1.2300884955752212) internal successors, (139), 115 states have internal predecessors, (139), 49 states have call successors, (49), 10 states have call predecessors, (49), 10 states have return successors, (48), 47 states have call predecessors, (48), 48 states have call successors, (48) [2023-12-02 19:13:25,601 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 173 states to 173 states and 236 transitions. [2023-12-02 19:13:25,601 INFO L78 Accepts]: Start accepts. Automaton has 173 states and 236 transitions. Word has length 61 [2023-12-02 19:13:25,601 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 19:13:25,602 INFO L495 AbstractCegarLoop]: Abstraction has 173 states and 236 transitions. [2023-12-02 19:13:25,602 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 15 states, 14 states have (on average 2.357142857142857) internal successors, (33), 12 states have internal predecessors, (33), 4 states have call successors, (20), 3 states have call predecessors, (20), 3 states have return successors, (19), 6 states have call predecessors, (19), 4 states have call successors, (19) [2023-12-02 19:13:25,602 INFO L276 IsEmpty]: Start isEmpty. Operand 173 states and 236 transitions. [2023-12-02 19:13:25,604 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 60 [2023-12-02 19:13:25,604 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 19:13:25,604 INFO L195 NwaCegarLoop]: trace histogram [5, 4, 4, 4, 4, 3, 3, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-12-02 19:13:25,610 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_da5dfcc8-f7a4-4d22-a963-15355fed9e59/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Ended with exit code 0 [2023-12-02 19:13:25,805 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7,9 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_da5dfcc8-f7a4-4d22-a963-15355fed9e59/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 19:13:25,805 INFO L420 AbstractCegarLoop]: === Iteration 9 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 19:13:25,806 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 19:13:25,806 INFO L85 PathProgramCache]: Analyzing trace with hash -94425734, now seen corresponding path program 1 times [2023-12-02 19:13:25,806 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 19:13:25,806 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1901418062] [2023-12-02 19:13:25,806 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 19:13:25,806 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 19:13:25,816 ERROR L246 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2023-12-02 19:13:25,817 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1441704798] [2023-12-02 19:13:25,817 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 19:13:25,817 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 19:13:25,817 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_da5dfcc8-f7a4-4d22-a963-15355fed9e59/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 19:13:25,818 INFO L229 MonitoredProcess]: Starting monitored process 10 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_da5dfcc8-f7a4-4d22-a963-15355fed9e59/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 19:13:25,819 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_da5dfcc8-f7a4-4d22-a963-15355fed9e59/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Waiting until timeout for monitored process [2023-12-02 19:13:25,870 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 19:13:25,872 INFO L262 TraceCheckSpWp]: Trace formula consists of 179 conjuncts, 32 conjunts are in the unsatisfiable core [2023-12-02 19:13:25,874 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 19:13:26,598 INFO L134 CoverageAnalysis]: Checked inductivity of 65 backedges. 12 proven. 29 refuted. 0 times theorem prover too weak. 24 trivial. 0 not checked. [2023-12-02 19:13:26,598 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-12-02 19:13:27,214 INFO L134 CoverageAnalysis]: Checked inductivity of 65 backedges. 25 proven. 9 refuted. 0 times theorem prover too weak. 31 trivial. 0 not checked. [2023-12-02 19:13:27,214 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 19:13:27,214 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1901418062] [2023-12-02 19:13:27,214 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2023-12-02 19:13:27,214 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1441704798] [2023-12-02 19:13:27,215 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1441704798] provided 0 perfect and 2 imperfect interpolant sequences [2023-12-02 19:13:27,215 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [168468304] [2023-12-02 19:13:27,217 INFO L159 IcfgInterpreter]: Started Sifa with 27 locations of interest [2023-12-02 19:13:27,217 INFO L166 IcfgInterpreter]: Building call graph [2023-12-02 19:13:27,217 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-12-02 19:13:27,218 INFO L176 IcfgInterpreter]: Starting interpretation [2023-12-02 19:13:27,218 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-12-02 19:13:31,219 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 9 for LOIs [2023-12-02 19:13:31,224 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 3 for LOIs [2023-12-02 19:13:31,224 INFO L180 IcfgInterpreter]: Interpretation finished [2023-12-02 19:13:31,962 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '4203#(and (= |__VERIFIER_assert_#in~cond| 0) (= __VERIFIER_assert_~cond 0))' at error location [2023-12-02 19:13:31,962 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-12-02 19:13:31,962 INFO L185 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2023-12-02 19:13:31,962 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 8] total 22 [2023-12-02 19:13:31,963 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1079100441] [2023-12-02 19:13:31,963 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2023-12-02 19:13:31,963 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 22 states [2023-12-02 19:13:31,963 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 19:13:31,964 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2023-12-02 19:13:31,965 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=154, Invalid=1406, Unknown=0, NotChecked=0, Total=1560 [2023-12-02 19:13:31,965 INFO L87 Difference]: Start difference. First operand 173 states and 236 transitions. Second operand has 22 states, 21 states have (on average 2.6666666666666665) internal successors, (56), 18 states have internal predecessors, (56), 7 states have call successors, (15), 3 states have call predecessors, (15), 3 states have return successors, (14), 5 states have call predecessors, (14), 5 states have call successors, (14) [2023-12-02 19:13:59,938 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.80s for a HTC check with result INVALID. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2023-12-02 19:14:21,245 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 19:14:21,246 INFO L93 Difference]: Finished difference Result 345 states and 482 transitions. [2023-12-02 19:14:21,246 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 33 states. [2023-12-02 19:14:21,246 INFO L78 Accepts]: Start accepts. Automaton has has 22 states, 21 states have (on average 2.6666666666666665) internal successors, (56), 18 states have internal predecessors, (56), 7 states have call successors, (15), 3 states have call predecessors, (15), 3 states have return successors, (14), 5 states have call predecessors, (14), 5 states have call successors, (14) Word has length 59 [2023-12-02 19:14:21,247 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 19:14:21,249 INFO L225 Difference]: With dead ends: 345 [2023-12-02 19:14:21,249 INFO L226 Difference]: Without dead ends: 289 [2023-12-02 19:14:21,252 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 214 GetRequests, 149 SyntacticMatches, 1 SemanticMatches, 64 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1163 ImplicationChecksByTransitivity, 33.6s TimeCoverageRelationStatistics Valid=513, Invalid=3777, Unknown=0, NotChecked=0, Total=4290 [2023-12-02 19:14:21,253 INFO L413 NwaCegarLoop]: 53 mSDtfsCounter, 144 mSDsluCounter, 404 mSDsCounter, 0 mSdLazyCounter, 739 mSolverCounterSat, 107 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 17.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 145 SdHoareTripleChecker+Valid, 457 SdHoareTripleChecker+Invalid, 846 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 107 IncrementalHoareTripleChecker+Valid, 739 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 17.1s IncrementalHoareTripleChecker+Time [2023-12-02 19:14:21,253 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [145 Valid, 457 Invalid, 846 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [107 Valid, 739 Invalid, 0 Unknown, 0 Unchecked, 17.1s Time] [2023-12-02 19:14:21,254 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 289 states. [2023-12-02 19:14:21,377 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 289 to 214. [2023-12-02 19:14:21,377 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 214 states, 145 states have (on average 1.2137931034482758) internal successors, (176), 150 states have internal predecessors, (176), 55 states have call successors, (55), 13 states have call predecessors, (55), 13 states have return successors, (54), 50 states have call predecessors, (54), 54 states have call successors, (54) [2023-12-02 19:14:21,379 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 214 states to 214 states and 285 transitions. [2023-12-02 19:14:21,379 INFO L78 Accepts]: Start accepts. Automaton has 214 states and 285 transitions. Word has length 59 [2023-12-02 19:14:21,379 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 19:14:21,379 INFO L495 AbstractCegarLoop]: Abstraction has 214 states and 285 transitions. [2023-12-02 19:14:21,380 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 22 states, 21 states have (on average 2.6666666666666665) internal successors, (56), 18 states have internal predecessors, (56), 7 states have call successors, (15), 3 states have call predecessors, (15), 3 states have return successors, (14), 5 states have call predecessors, (14), 5 states have call successors, (14) [2023-12-02 19:14:21,380 INFO L276 IsEmpty]: Start isEmpty. Operand 214 states and 285 transitions. [2023-12-02 19:14:21,381 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 60 [2023-12-02 19:14:21,381 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 19:14:21,381 INFO L195 NwaCegarLoop]: trace histogram [5, 4, 4, 4, 4, 3, 3, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-12-02 19:14:21,386 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_da5dfcc8-f7a4-4d22-a963-15355fed9e59/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Ended with exit code 0 [2023-12-02 19:14:21,582 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8,10 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_da5dfcc8-f7a4-4d22-a963-15355fed9e59/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 19:14:21,582 INFO L420 AbstractCegarLoop]: === Iteration 10 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 19:14:21,582 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 19:14:21,583 INFO L85 PathProgramCache]: Analyzing trace with hash -1223812978, now seen corresponding path program 2 times [2023-12-02 19:14:21,583 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 19:14:21,583 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [926755974] [2023-12-02 19:14:21,583 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 19:14:21,583 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 19:14:21,592 ERROR L246 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2023-12-02 19:14:21,592 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1918695123] [2023-12-02 19:14:21,593 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2023-12-02 19:14:21,593 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 19:14:21,593 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_da5dfcc8-f7a4-4d22-a963-15355fed9e59/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 19:14:21,594 INFO L229 MonitoredProcess]: Starting monitored process 11 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_da5dfcc8-f7a4-4d22-a963-15355fed9e59/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 19:14:21,596 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_da5dfcc8-f7a4-4d22-a963-15355fed9e59/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Waiting until timeout for monitored process [2023-12-02 19:14:21,641 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2023-12-02 19:14:21,641 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-12-02 19:14:21,642 INFO L262 TraceCheckSpWp]: Trace formula consists of 123 conjuncts, 5 conjunts are in the unsatisfiable core [2023-12-02 19:14:21,644 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 19:14:21,659 INFO L134 CoverageAnalysis]: Checked inductivity of 65 backedges. 27 proven. 0 refuted. 0 times theorem prover too weak. 38 trivial. 0 not checked. [2023-12-02 19:14:21,659 INFO L323 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2023-12-02 19:14:21,660 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 19:14:21,660 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [926755974] [2023-12-02 19:14:21,660 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2023-12-02 19:14:21,660 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1918695123] [2023-12-02 19:14:21,660 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1918695123] provided 1 perfect and 0 imperfect interpolant sequences [2023-12-02 19:14:21,660 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-12-02 19:14:21,660 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2023-12-02 19:14:21,660 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1090725906] [2023-12-02 19:14:21,660 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-12-02 19:14:21,661 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2023-12-02 19:14:21,661 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 19:14:21,661 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2023-12-02 19:14:21,661 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2023-12-02 19:14:21,662 INFO L87 Difference]: Start difference. First operand 214 states and 285 transitions. Second operand has 5 states, 5 states have (on average 5.8) internal successors, (29), 5 states have internal predecessors, (29), 2 states have call successors, (9), 2 states have call predecessors, (9), 1 states have return successors, (8), 1 states have call predecessors, (8), 1 states have call successors, (8) [2023-12-02 19:14:21,893 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 19:14:21,894 INFO L93 Difference]: Finished difference Result 280 states and 378 transitions. [2023-12-02 19:14:21,894 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2023-12-02 19:14:21,894 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 5.8) internal successors, (29), 5 states have internal predecessors, (29), 2 states have call successors, (9), 2 states have call predecessors, (9), 1 states have return successors, (8), 1 states have call predecessors, (8), 1 states have call successors, (8) Word has length 59 [2023-12-02 19:14:21,895 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 19:14:21,897 INFO L225 Difference]: With dead ends: 280 [2023-12-02 19:14:21,897 INFO L226 Difference]: Without dead ends: 224 [2023-12-02 19:14:21,897 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 61 GetRequests, 56 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=15, Invalid=27, Unknown=0, NotChecked=0, Total=42 [2023-12-02 19:14:21,898 INFO L413 NwaCegarLoop]: 44 mSDtfsCounter, 19 mSDsluCounter, 99 mSDsCounter, 0 mSdLazyCounter, 58 mSolverCounterSat, 8 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 23 SdHoareTripleChecker+Valid, 143 SdHoareTripleChecker+Invalid, 66 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 8 IncrementalHoareTripleChecker+Valid, 58 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2023-12-02 19:14:21,898 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [23 Valid, 143 Invalid, 66 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [8 Valid, 58 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2023-12-02 19:14:21,899 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 224 states. [2023-12-02 19:14:21,994 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 224 to 180. [2023-12-02 19:14:21,994 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 180 states, 119 states have (on average 1.184873949579832) internal successors, (141), 121 states have internal predecessors, (141), 47 states have call successors, (47), 13 states have call predecessors, (47), 13 states have return successors, (46), 45 states have call predecessors, (46), 46 states have call successors, (46) [2023-12-02 19:14:21,995 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 180 states to 180 states and 234 transitions. [2023-12-02 19:14:21,996 INFO L78 Accepts]: Start accepts. Automaton has 180 states and 234 transitions. Word has length 59 [2023-12-02 19:14:21,996 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 19:14:21,996 INFO L495 AbstractCegarLoop]: Abstraction has 180 states and 234 transitions. [2023-12-02 19:14:21,996 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 5.8) internal successors, (29), 5 states have internal predecessors, (29), 2 states have call successors, (9), 2 states have call predecessors, (9), 1 states have return successors, (8), 1 states have call predecessors, (8), 1 states have call successors, (8) [2023-12-02 19:14:21,996 INFO L276 IsEmpty]: Start isEmpty. Operand 180 states and 234 transitions. [2023-12-02 19:14:21,997 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 65 [2023-12-02 19:14:21,997 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 19:14:21,997 INFO L195 NwaCegarLoop]: trace histogram [7, 6, 6, 4, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-12-02 19:14:22,001 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_da5dfcc8-f7a4-4d22-a963-15355fed9e59/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Ended with exit code 0 [2023-12-02 19:14:22,197 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable9,11 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_da5dfcc8-f7a4-4d22-a963-15355fed9e59/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 19:14:22,198 INFO L420 AbstractCegarLoop]: === Iteration 11 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 19:14:22,198 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 19:14:22,198 INFO L85 PathProgramCache]: Analyzing trace with hash -365871756, now seen corresponding path program 3 times [2023-12-02 19:14:22,198 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 19:14:22,198 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [462216490] [2023-12-02 19:14:22,198 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 19:14:22,199 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 19:14:22,206 ERROR L246 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2023-12-02 19:14:22,206 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [22505552] [2023-12-02 19:14:22,206 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2023-12-02 19:14:22,206 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 19:14:22,206 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_da5dfcc8-f7a4-4d22-a963-15355fed9e59/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 19:14:22,207 INFO L229 MonitoredProcess]: Starting monitored process 12 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_da5dfcc8-f7a4-4d22-a963-15355fed9e59/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 19:14:22,208 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_da5dfcc8-f7a4-4d22-a963-15355fed9e59/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Waiting until timeout for monitored process [2023-12-02 19:14:22,253 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2023-12-02 19:14:22,253 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-12-02 19:14:22,254 INFO L262 TraceCheckSpWp]: Trace formula consists of 154 conjuncts, 4 conjunts are in the unsatisfiable core [2023-12-02 19:14:22,256 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 19:14:22,282 INFO L134 CoverageAnalysis]: Checked inductivity of 96 backedges. 48 proven. 0 refuted. 0 times theorem prover too weak. 48 trivial. 0 not checked. [2023-12-02 19:14:22,282 INFO L323 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2023-12-02 19:14:22,282 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 19:14:22,282 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [462216490] [2023-12-02 19:14:22,282 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2023-12-02 19:14:22,282 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [22505552] [2023-12-02 19:14:22,283 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [22505552] provided 1 perfect and 0 imperfect interpolant sequences [2023-12-02 19:14:22,283 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-12-02 19:14:22,283 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2023-12-02 19:14:22,283 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [351748936] [2023-12-02 19:14:22,283 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-12-02 19:14:22,283 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2023-12-02 19:14:22,283 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 19:14:22,284 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2023-12-02 19:14:22,284 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2023-12-02 19:14:22,284 INFO L87 Difference]: Start difference. First operand 180 states and 234 transitions. Second operand has 5 states, 5 states have (on average 4.8) internal successors, (24), 5 states have internal predecessors, (24), 3 states have call successors, (11), 2 states have call predecessors, (11), 2 states have return successors, (10), 3 states have call predecessors, (10), 3 states have call successors, (10) [2023-12-02 19:14:22,449 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 19:14:22,449 INFO L93 Difference]: Finished difference Result 308 states and 413 transitions. [2023-12-02 19:14:22,449 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2023-12-02 19:14:22,449 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 4.8) internal successors, (24), 5 states have internal predecessors, (24), 3 states have call successors, (11), 2 states have call predecessors, (11), 2 states have return successors, (10), 3 states have call predecessors, (10), 3 states have call successors, (10) Word has length 64 [2023-12-02 19:14:22,449 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 19:14:22,451 INFO L225 Difference]: With dead ends: 308 [2023-12-02 19:14:22,451 INFO L226 Difference]: Without dead ends: 216 [2023-12-02 19:14:22,452 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 63 GetRequests, 60 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2023-12-02 19:14:22,452 INFO L413 NwaCegarLoop]: 32 mSDtfsCounter, 0 mSDsluCounter, 72 mSDsCounter, 0 mSdLazyCounter, 48 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 104 SdHoareTripleChecker+Invalid, 49 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 48 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2023-12-02 19:14:22,453 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [0 Valid, 104 Invalid, 49 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 48 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2023-12-02 19:14:22,453 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 216 states. [2023-12-02 19:14:22,575 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 216 to 207. [2023-12-02 19:14:22,576 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 207 states, 130 states have (on average 1.176923076923077) internal successors, (153), 132 states have internal predecessors, (153), 63 states have call successors, (63), 13 states have call predecessors, (63), 13 states have return successors, (62), 61 states have call predecessors, (62), 62 states have call successors, (62) [2023-12-02 19:14:22,578 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 207 states to 207 states and 278 transitions. [2023-12-02 19:14:22,578 INFO L78 Accepts]: Start accepts. Automaton has 207 states and 278 transitions. Word has length 64 [2023-12-02 19:14:22,578 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 19:14:22,578 INFO L495 AbstractCegarLoop]: Abstraction has 207 states and 278 transitions. [2023-12-02 19:14:22,578 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 4.8) internal successors, (24), 5 states have internal predecessors, (24), 3 states have call successors, (11), 2 states have call predecessors, (11), 2 states have return successors, (10), 3 states have call predecessors, (10), 3 states have call successors, (10) [2023-12-02 19:14:22,579 INFO L276 IsEmpty]: Start isEmpty. Operand 207 states and 278 transitions. [2023-12-02 19:14:22,580 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 65 [2023-12-02 19:14:22,580 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 19:14:22,580 INFO L195 NwaCegarLoop]: trace histogram [7, 6, 6, 4, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-12-02 19:14:22,585 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_da5dfcc8-f7a4-4d22-a963-15355fed9e59/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Ended with exit code 0 [2023-12-02 19:14:22,781 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable10,12 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_da5dfcc8-f7a4-4d22-a963-15355fed9e59/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 19:14:22,781 INFO L420 AbstractCegarLoop]: === Iteration 12 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 19:14:22,782 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 19:14:22,782 INFO L85 PathProgramCache]: Analyzing trace with hash 255729376, now seen corresponding path program 4 times [2023-12-02 19:14:22,782 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 19:14:22,782 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [255275757] [2023-12-02 19:14:22,782 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 19:14:22,782 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 19:14:22,789 ERROR L246 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2023-12-02 19:14:22,789 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1104720367] [2023-12-02 19:14:22,789 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2023-12-02 19:14:22,789 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 19:14:22,789 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_da5dfcc8-f7a4-4d22-a963-15355fed9e59/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 19:14:22,790 INFO L229 MonitoredProcess]: Starting monitored process 13 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_da5dfcc8-f7a4-4d22-a963-15355fed9e59/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 19:14:22,791 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_da5dfcc8-f7a4-4d22-a963-15355fed9e59/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Waiting until timeout for monitored process [2023-12-02 19:14:22,840 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 19:14:22,841 INFO L262 TraceCheckSpWp]: Trace formula consists of 177 conjuncts, 23 conjunts are in the unsatisfiable core [2023-12-02 19:14:22,844 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 19:14:22,945 INFO L134 CoverageAnalysis]: Checked inductivity of 96 backedges. 20 proven. 7 refuted. 0 times theorem prover too weak. 69 trivial. 0 not checked. [2023-12-02 19:14:22,945 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-12-02 19:14:23,008 INFO L134 CoverageAnalysis]: Checked inductivity of 96 backedges. 20 proven. 0 refuted. 0 times theorem prover too weak. 76 trivial. 0 not checked. [2023-12-02 19:14:23,008 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 19:14:23,008 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [255275757] [2023-12-02 19:14:23,008 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2023-12-02 19:14:23,008 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1104720367] [2023-12-02 19:14:23,008 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1104720367] provided 1 perfect and 1 imperfect interpolant sequences [2023-12-02 19:14:23,008 INFO L185 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2023-12-02 19:14:23,008 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [11] total 14 [2023-12-02 19:14:23,008 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1955742343] [2023-12-02 19:14:23,008 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-12-02 19:14:23,009 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2023-12-02 19:14:23,009 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 19:14:23,009 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2023-12-02 19:14:23,009 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=31, Invalid=151, Unknown=0, NotChecked=0, Total=182 [2023-12-02 19:14:23,009 INFO L87 Difference]: Start difference. First operand 207 states and 278 transitions. Second operand has 5 states, 5 states have (on average 4.6) internal successors, (23), 4 states have internal predecessors, (23), 2 states have call successors, (11), 2 states have call predecessors, (11), 1 states have return successors, (10), 2 states have call predecessors, (10), 2 states have call successors, (10) [2023-12-02 19:14:23,189 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 19:14:23,189 INFO L93 Difference]: Finished difference Result 236 states and 318 transitions. [2023-12-02 19:14:23,190 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2023-12-02 19:14:23,190 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 4.6) internal successors, (23), 4 states have internal predecessors, (23), 2 states have call successors, (11), 2 states have call predecessors, (11), 1 states have return successors, (10), 2 states have call predecessors, (10), 2 states have call successors, (10) Word has length 64 [2023-12-02 19:14:23,190 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 19:14:23,191 INFO L225 Difference]: With dead ends: 236 [2023-12-02 19:14:23,191 INFO L226 Difference]: Without dead ends: 234 [2023-12-02 19:14:23,192 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 127 GetRequests, 114 SyntacticMatches, 0 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 25 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=35, Invalid=175, Unknown=0, NotChecked=0, Total=210 [2023-12-02 19:14:23,192 INFO L413 NwaCegarLoop]: 29 mSDtfsCounter, 7 mSDsluCounter, 73 mSDsCounter, 0 mSdLazyCounter, 49 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 9 SdHoareTripleChecker+Valid, 102 SdHoareTripleChecker+Invalid, 50 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 49 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2023-12-02 19:14:23,192 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [9 Valid, 102 Invalid, 50 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 49 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2023-12-02 19:14:23,193 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 234 states. [2023-12-02 19:14:23,346 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 234 to 230. [2023-12-02 19:14:23,347 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 230 states, 141 states have (on average 1.1843971631205674) internal successors, (167), 142 states have internal predecessors, (167), 73 states have call successors, (73), 15 states have call predecessors, (73), 15 states have return successors, (72), 72 states have call predecessors, (72), 72 states have call successors, (72) [2023-12-02 19:14:23,348 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 230 states to 230 states and 312 transitions. [2023-12-02 19:14:23,348 INFO L78 Accepts]: Start accepts. Automaton has 230 states and 312 transitions. Word has length 64 [2023-12-02 19:14:23,348 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 19:14:23,349 INFO L495 AbstractCegarLoop]: Abstraction has 230 states and 312 transitions. [2023-12-02 19:14:23,349 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 4.6) internal successors, (23), 4 states have internal predecessors, (23), 2 states have call successors, (11), 2 states have call predecessors, (11), 1 states have return successors, (10), 2 states have call predecessors, (10), 2 states have call successors, (10) [2023-12-02 19:14:23,349 INFO L276 IsEmpty]: Start isEmpty. Operand 230 states and 312 transitions. [2023-12-02 19:14:23,349 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 65 [2023-12-02 19:14:23,349 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 19:14:23,349 INFO L195 NwaCegarLoop]: trace histogram [6, 5, 5, 4, 4, 3, 3, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-12-02 19:14:23,354 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_da5dfcc8-f7a4-4d22-a963-15355fed9e59/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Ended with exit code 0 [2023-12-02 19:14:23,550 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 13 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_da5dfcc8-f7a4-4d22-a963-15355fed9e59/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable11 [2023-12-02 19:14:23,550 INFO L420 AbstractCegarLoop]: === Iteration 13 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 19:14:23,550 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 19:14:23,550 INFO L85 PathProgramCache]: Analyzing trace with hash 1508724982, now seen corresponding path program 5 times [2023-12-02 19:14:23,551 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 19:14:23,551 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [659185283] [2023-12-02 19:14:23,551 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 19:14:23,551 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 19:14:23,559 ERROR L246 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2023-12-02 19:14:23,559 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1479523149] [2023-12-02 19:14:23,559 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2023-12-02 19:14:23,559 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 19:14:23,559 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_da5dfcc8-f7a4-4d22-a963-15355fed9e59/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 19:14:23,560 INFO L229 MonitoredProcess]: Starting monitored process 14 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_da5dfcc8-f7a4-4d22-a963-15355fed9e59/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 19:14:23,561 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_da5dfcc8-f7a4-4d22-a963-15355fed9e59/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (14)] Waiting until timeout for monitored process [2023-12-02 19:14:23,609 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2023-12-02 19:14:23,609 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-12-02 19:14:23,611 INFO L262 TraceCheckSpWp]: Trace formula consists of 153 conjuncts, 70 conjunts are in the unsatisfiable core [2023-12-02 19:14:23,613 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 19:14:24,350 INFO L134 CoverageAnalysis]: Checked inductivity of 84 backedges. 24 proven. 23 refuted. 0 times theorem prover too weak. 37 trivial. 0 not checked. [2023-12-02 19:14:24,350 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-12-02 19:14:25,953 INFO L134 CoverageAnalysis]: Checked inductivity of 84 backedges. 23 proven. 21 refuted. 0 times theorem prover too weak. 40 trivial. 0 not checked. [2023-12-02 19:14:25,953 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 19:14:25,953 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [659185283] [2023-12-02 19:14:25,953 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2023-12-02 19:14:25,953 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1479523149] [2023-12-02 19:14:25,953 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1479523149] provided 0 perfect and 2 imperfect interpolant sequences [2023-12-02 19:14:25,953 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1618494274] [2023-12-02 19:14:25,955 INFO L159 IcfgInterpreter]: Started Sifa with 27 locations of interest [2023-12-02 19:14:25,956 INFO L166 IcfgInterpreter]: Building call graph [2023-12-02 19:14:25,956 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-12-02 19:14:25,956 INFO L176 IcfgInterpreter]: Starting interpretation [2023-12-02 19:14:25,956 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-12-02 19:14:29,804 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 9 for LOIs [2023-12-02 19:14:29,809 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 3 for LOIs [2023-12-02 19:14:29,809 INFO L180 IcfgInterpreter]: Interpretation finished [2023-12-02 19:14:32,540 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '8534#(and (= |__VERIFIER_assert_#in~cond| 0) (= __VERIFIER_assert_~cond 0))' at error location [2023-12-02 19:14:32,540 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-12-02 19:14:32,540 INFO L185 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2023-12-02 19:14:32,540 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [18, 15] total 30 [2023-12-02 19:14:32,540 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [443009330] [2023-12-02 19:14:32,540 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2023-12-02 19:14:32,541 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 30 states [2023-12-02 19:14:32,541 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 19:14:32,542 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 30 interpolants. [2023-12-02 19:14:32,543 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=255, Invalid=2001, Unknown=0, NotChecked=0, Total=2256 [2023-12-02 19:14:32,543 INFO L87 Difference]: Start difference. First operand 230 states and 312 transitions. Second operand has 30 states, 27 states have (on average 2.185185185185185) internal successors, (59), 26 states have internal predecessors, (59), 7 states have call successors, (16), 3 states have call predecessors, (16), 3 states have return successors, (15), 6 states have call predecessors, (15), 5 states have call successors, (15) [2023-12-02 19:14:39,960 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2023-12-02 19:14:46,267 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 19:14:46,267 INFO L93 Difference]: Finished difference Result 323 states and 432 transitions. [2023-12-02 19:14:46,268 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 38 states. [2023-12-02 19:14:46,268 INFO L78 Accepts]: Start accepts. Automaton has has 30 states, 27 states have (on average 2.185185185185185) internal successors, (59), 26 states have internal predecessors, (59), 7 states have call successors, (16), 3 states have call predecessors, (16), 3 states have return successors, (15), 6 states have call predecessors, (15), 5 states have call successors, (15) Word has length 64 [2023-12-02 19:14:46,268 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 19:14:46,270 INFO L225 Difference]: With dead ends: 323 [2023-12-02 19:14:46,270 INFO L226 Difference]: Without dead ends: 321 [2023-12-02 19:14:46,273 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 220 GetRequests, 145 SyntacticMatches, 1 SemanticMatches, 74 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1713 ImplicationChecksByTransitivity, 10.8s TimeCoverageRelationStatistics Valid=803, Invalid=4897, Unknown=0, NotChecked=0, Total=5700 [2023-12-02 19:14:46,274 INFO L413 NwaCegarLoop]: 30 mSDtfsCounter, 254 mSDsluCounter, 404 mSDsCounter, 0 mSdLazyCounter, 744 mSolverCounterSat, 231 mSolverCounterUnsat, 1 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 6.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 254 SdHoareTripleChecker+Valid, 434 SdHoareTripleChecker+Invalid, 976 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 231 IncrementalHoareTripleChecker+Valid, 744 IncrementalHoareTripleChecker+Invalid, 1 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 6.7s IncrementalHoareTripleChecker+Time [2023-12-02 19:14:46,274 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [254 Valid, 434 Invalid, 976 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [231 Valid, 744 Invalid, 1 Unknown, 0 Unchecked, 6.7s Time] [2023-12-02 19:14:46,275 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 321 states. [2023-12-02 19:14:46,508 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 321 to 303. [2023-12-02 19:14:46,508 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 303 states, 190 states have (on average 1.1736842105263159) internal successors, (223), 193 states have internal predecessors, (223), 93 states have call successors, (93), 19 states have call predecessors, (93), 19 states have return successors, (92), 90 states have call predecessors, (92), 92 states have call successors, (92) [2023-12-02 19:14:46,511 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 303 states to 303 states and 408 transitions. [2023-12-02 19:14:46,511 INFO L78 Accepts]: Start accepts. Automaton has 303 states and 408 transitions. Word has length 64 [2023-12-02 19:14:46,511 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 19:14:46,511 INFO L495 AbstractCegarLoop]: Abstraction has 303 states and 408 transitions. [2023-12-02 19:14:46,512 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 30 states, 27 states have (on average 2.185185185185185) internal successors, (59), 26 states have internal predecessors, (59), 7 states have call successors, (16), 3 states have call predecessors, (16), 3 states have return successors, (15), 6 states have call predecessors, (15), 5 states have call successors, (15) [2023-12-02 19:14:46,512 INFO L276 IsEmpty]: Start isEmpty. Operand 303 states and 408 transitions. [2023-12-02 19:14:46,513 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 79 [2023-12-02 19:14:46,513 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 19:14:46,513 INFO L195 NwaCegarLoop]: trace histogram [9, 8, 8, 4, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-12-02 19:14:46,518 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_da5dfcc8-f7a4-4d22-a963-15355fed9e59/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (14)] Ended with exit code 0 [2023-12-02 19:14:46,714 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 14 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_da5dfcc8-f7a4-4d22-a963-15355fed9e59/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable12 [2023-12-02 19:14:46,714 INFO L420 AbstractCegarLoop]: === Iteration 14 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 19:14:46,714 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 19:14:46,714 INFO L85 PathProgramCache]: Analyzing trace with hash 1897496259, now seen corresponding path program 1 times [2023-12-02 19:14:46,714 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 19:14:46,715 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [533718404] [2023-12-02 19:14:46,715 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 19:14:46,715 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 19:14:46,723 ERROR L246 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2023-12-02 19:14:46,724 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1057042248] [2023-12-02 19:14:46,724 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 19:14:46,724 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 19:14:46,724 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_da5dfcc8-f7a4-4d22-a963-15355fed9e59/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 19:14:46,725 INFO L229 MonitoredProcess]: Starting monitored process 15 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_da5dfcc8-f7a4-4d22-a963-15355fed9e59/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 19:14:46,726 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_da5dfcc8-f7a4-4d22-a963-15355fed9e59/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (15)] Waiting until timeout for monitored process [2023-12-02 19:14:46,796 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 19:14:46,798 INFO L262 TraceCheckSpWp]: Trace formula consists of 211 conjuncts, 76 conjunts are in the unsatisfiable core [2023-12-02 19:14:46,800 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 19:14:47,672 INFO L134 CoverageAnalysis]: Checked inductivity of 159 backedges. 32 proven. 27 refuted. 0 times theorem prover too weak. 100 trivial. 0 not checked. [2023-12-02 19:14:47,672 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-12-02 19:14:54,635 INFO L134 CoverageAnalysis]: Checked inductivity of 159 backedges. 30 proven. 26 refuted. 0 times theorem prover too weak. 103 trivial. 0 not checked. [2023-12-02 19:14:54,635 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 19:14:54,635 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [533718404] [2023-12-02 19:14:54,635 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2023-12-02 19:14:54,635 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1057042248] [2023-12-02 19:14:54,635 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1057042248] provided 0 perfect and 2 imperfect interpolant sequences [2023-12-02 19:14:54,635 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [827310482] [2023-12-02 19:14:54,637 INFO L159 IcfgInterpreter]: Started Sifa with 28 locations of interest [2023-12-02 19:14:54,637 INFO L166 IcfgInterpreter]: Building call graph [2023-12-02 19:14:54,637 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-12-02 19:14:54,637 INFO L176 IcfgInterpreter]: Starting interpretation [2023-12-02 19:14:54,637 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-12-02 19:14:56,940 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 1 for LOIs [2023-12-02 19:14:56,943 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 3 for LOIs [2023-12-02 19:14:56,944 INFO L180 IcfgInterpreter]: Interpretation finished [2023-12-02 19:15:00,105 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '10072#(and (= |__VERIFIER_assert_#in~cond| 0) (= __VERIFIER_assert_~cond 0))' at error location [2023-12-02 19:15:00,105 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-12-02 19:15:00,105 INFO L185 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2023-12-02 19:15:00,105 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [19, 16] total 32 [2023-12-02 19:15:00,105 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1434828090] [2023-12-02 19:15:00,106 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2023-12-02 19:15:00,106 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 32 states [2023-12-02 19:15:00,106 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 19:15:00,107 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 32 interpolants. [2023-12-02 19:15:00,108 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=233, Invalid=2023, Unknown=0, NotChecked=0, Total=2256 [2023-12-02 19:15:00,108 INFO L87 Difference]: Start difference. First operand 303 states and 408 transitions. Second operand has 32 states, 29 states have (on average 1.9655172413793103) internal successors, (57), 30 states have internal predecessors, (57), 9 states have call successors, (23), 3 states have call predecessors, (23), 3 states have return successors, (22), 7 states have call predecessors, (22), 7 states have call successors, (22) [2023-12-02 19:15:29,098 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 19:15:29,098 INFO L93 Difference]: Finished difference Result 494 states and 685 transitions. [2023-12-02 19:15:29,098 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 58 states. [2023-12-02 19:15:29,099 INFO L78 Accepts]: Start accepts. Automaton has has 32 states, 29 states have (on average 1.9655172413793103) internal successors, (57), 30 states have internal predecessors, (57), 9 states have call successors, (23), 3 states have call predecessors, (23), 3 states have return successors, (22), 7 states have call predecessors, (22), 7 states have call successors, (22) Word has length 78 [2023-12-02 19:15:29,099 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 19:15:29,102 INFO L225 Difference]: With dead ends: 494 [2023-12-02 19:15:29,102 INFO L226 Difference]: Without dead ends: 490 [2023-12-02 19:15:29,105 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 281 GetRequests, 186 SyntacticMatches, 1 SemanticMatches, 94 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2756 ImplicationChecksByTransitivity, 25.6s TimeCoverageRelationStatistics Valid=1368, Invalid=7752, Unknown=0, NotChecked=0, Total=9120 [2023-12-02 19:15:29,105 INFO L413 NwaCegarLoop]: 46 mSDtfsCounter, 281 mSDsluCounter, 720 mSDsCounter, 0 mSdLazyCounter, 1406 mSolverCounterSat, 274 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 8.8s Time, 0 mProtectedPredicate, 0 mProtectedAction, 281 SdHoareTripleChecker+Valid, 766 SdHoareTripleChecker+Invalid, 1680 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 274 IncrementalHoareTripleChecker+Valid, 1406 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 9.0s IncrementalHoareTripleChecker+Time [2023-12-02 19:15:29,105 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [281 Valid, 766 Invalid, 1680 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [274 Valid, 1406 Invalid, 0 Unknown, 0 Unchecked, 9.0s Time] [2023-12-02 19:15:29,106 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 490 states. [2023-12-02 19:15:29,618 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 490 to 466. [2023-12-02 19:15:29,619 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 466 states, 294 states have (on average 1.1870748299319729) internal successors, (349), 298 states have internal predecessors, (349), 147 states have call successors, (147), 24 states have call predecessors, (147), 24 states have return successors, (146), 143 states have call predecessors, (146), 146 states have call successors, (146) [2023-12-02 19:15:29,621 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 466 states to 466 states and 642 transitions. [2023-12-02 19:15:29,621 INFO L78 Accepts]: Start accepts. Automaton has 466 states and 642 transitions. Word has length 78 [2023-12-02 19:15:29,622 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 19:15:29,622 INFO L495 AbstractCegarLoop]: Abstraction has 466 states and 642 transitions. [2023-12-02 19:15:29,622 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 32 states, 29 states have (on average 1.9655172413793103) internal successors, (57), 30 states have internal predecessors, (57), 9 states have call successors, (23), 3 states have call predecessors, (23), 3 states have return successors, (22), 7 states have call predecessors, (22), 7 states have call successors, (22) [2023-12-02 19:15:29,622 INFO L276 IsEmpty]: Start isEmpty. Operand 466 states and 642 transitions. [2023-12-02 19:15:29,623 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 82 [2023-12-02 19:15:29,623 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 19:15:29,623 INFO L195 NwaCegarLoop]: trace histogram [11, 10, 10, 4, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-12-02 19:15:29,627 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_da5dfcc8-f7a4-4d22-a963-15355fed9e59/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (15)] Forceful destruction successful, exit code 0 [2023-12-02 19:15:29,823 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 15 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_da5dfcc8-f7a4-4d22-a963-15355fed9e59/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable13 [2023-12-02 19:15:29,824 INFO L420 AbstractCegarLoop]: === Iteration 15 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 19:15:29,824 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 19:15:29,824 INFO L85 PathProgramCache]: Analyzing trace with hash -1729932497, now seen corresponding path program 1 times [2023-12-02 19:15:29,824 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 19:15:29,824 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [337647495] [2023-12-02 19:15:29,824 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 19:15:29,824 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 19:15:29,831 ERROR L246 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2023-12-02 19:15:29,832 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [781371104] [2023-12-02 19:15:29,832 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 19:15:29,832 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 19:15:29,832 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_da5dfcc8-f7a4-4d22-a963-15355fed9e59/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 19:15:29,833 INFO L229 MonitoredProcess]: Starting monitored process 16 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_da5dfcc8-f7a4-4d22-a963-15355fed9e59/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 19:15:29,833 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_da5dfcc8-f7a4-4d22-a963-15355fed9e59/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (16)] Waiting until timeout for monitored process [2023-12-02 19:15:29,886 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 19:15:29,888 INFO L262 TraceCheckSpWp]: Trace formula consists of 199 conjuncts, 32 conjunts are in the unsatisfiable core [2023-12-02 19:15:29,890 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 19:15:30,136 INFO L134 CoverageAnalysis]: Checked inductivity of 228 backedges. 22 proven. 17 refuted. 0 times theorem prover too weak. 189 trivial. 0 not checked. [2023-12-02 19:15:30,136 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-12-02 19:15:30,710 INFO L134 CoverageAnalysis]: Checked inductivity of 228 backedges. 22 proven. 14 refuted. 0 times theorem prover too weak. 192 trivial. 0 not checked. [2023-12-02 19:15:30,710 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 19:15:30,710 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [337647495] [2023-12-02 19:15:30,711 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2023-12-02 19:15:30,711 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [781371104] [2023-12-02 19:15:30,711 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [781371104] provided 0 perfect and 2 imperfect interpolant sequences [2023-12-02 19:15:30,711 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [7795356] [2023-12-02 19:15:30,713 INFO L159 IcfgInterpreter]: Started Sifa with 26 locations of interest [2023-12-02 19:15:30,713 INFO L166 IcfgInterpreter]: Building call graph [2023-12-02 19:15:30,713 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-12-02 19:15:30,713 INFO L176 IcfgInterpreter]: Starting interpretation [2023-12-02 19:15:30,713 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-12-02 19:15:32,070 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 1 for LOIs [2023-12-02 19:15:32,073 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 3 for LOIs [2023-12-02 19:15:32,073 INFO L180 IcfgInterpreter]: Interpretation finished [2023-12-02 19:15:33,567 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '12184#(and (= |__VERIFIER_assert_#in~cond| 0) (= __VERIFIER_assert_~cond 0))' at error location [2023-12-02 19:15:33,567 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-12-02 19:15:33,567 INFO L185 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2023-12-02 19:15:33,567 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 10] total 21 [2023-12-02 19:15:33,567 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [260019854] [2023-12-02 19:15:33,567 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2023-12-02 19:15:33,568 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 21 states [2023-12-02 19:15:33,568 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 19:15:33,568 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2023-12-02 19:15:33,569 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=161, Invalid=1171, Unknown=0, NotChecked=0, Total=1332 [2023-12-02 19:15:33,569 INFO L87 Difference]: Start difference. First operand 466 states and 642 transitions. Second operand has 21 states, 20 states have (on average 1.9) internal successors, (38), 18 states have internal predecessors, (38), 8 states have call successors, (27), 3 states have call predecessors, (27), 2 states have return successors, (26), 8 states have call predecessors, (26), 8 states have call successors, (26) [2023-12-02 19:15:37,570 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 19:15:37,570 INFO L93 Difference]: Finished difference Result 901 states and 1357 transitions. [2023-12-02 19:15:37,570 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 35 states. [2023-12-02 19:15:37,571 INFO L78 Accepts]: Start accepts. Automaton has has 21 states, 20 states have (on average 1.9) internal successors, (38), 18 states have internal predecessors, (38), 8 states have call successors, (27), 3 states have call predecessors, (27), 2 states have return successors, (26), 8 states have call predecessors, (26), 8 states have call successors, (26) Word has length 81 [2023-12-02 19:15:37,571 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 19:15:37,577 INFO L225 Difference]: With dead ends: 901 [2023-12-02 19:15:37,577 INFO L226 Difference]: Without dead ends: 899 [2023-12-02 19:15:37,579 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 271 GetRequests, 207 SyntacticMatches, 0 SemanticMatches, 64 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1235 ImplicationChecksByTransitivity, 3.2s TimeCoverageRelationStatistics Valid=651, Invalid=3639, Unknown=0, NotChecked=0, Total=4290 [2023-12-02 19:15:37,580 INFO L413 NwaCegarLoop]: 40 mSDtfsCounter, 128 mSDsluCounter, 372 mSDsCounter, 0 mSdLazyCounter, 464 mSolverCounterSat, 105 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 132 SdHoareTripleChecker+Valid, 412 SdHoareTripleChecker+Invalid, 569 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 105 IncrementalHoareTripleChecker+Valid, 464 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.1s IncrementalHoareTripleChecker+Time [2023-12-02 19:15:37,580 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [132 Valid, 412 Invalid, 569 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [105 Valid, 464 Invalid, 0 Unknown, 0 Unchecked, 1.1s Time] [2023-12-02 19:15:37,581 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 899 states. [2023-12-02 19:15:38,727 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 899 to 798. [2023-12-02 19:15:38,729 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 798 states, 442 states have (on average 1.253393665158371) internal successors, (554), 446 states have internal predecessors, (554), 327 states have call successors, (327), 28 states have call predecessors, (327), 28 states have return successors, (326), 323 states have call predecessors, (326), 326 states have call successors, (326) [2023-12-02 19:15:38,733 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 798 states to 798 states and 1207 transitions. [2023-12-02 19:15:38,733 INFO L78 Accepts]: Start accepts. Automaton has 798 states and 1207 transitions. Word has length 81 [2023-12-02 19:15:38,733 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 19:15:38,733 INFO L495 AbstractCegarLoop]: Abstraction has 798 states and 1207 transitions. [2023-12-02 19:15:38,733 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 21 states, 20 states have (on average 1.9) internal successors, (38), 18 states have internal predecessors, (38), 8 states have call successors, (27), 3 states have call predecessors, (27), 2 states have return successors, (26), 8 states have call predecessors, (26), 8 states have call successors, (26) [2023-12-02 19:15:38,734 INFO L276 IsEmpty]: Start isEmpty. Operand 798 states and 1207 transitions. [2023-12-02 19:15:38,735 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 87 [2023-12-02 19:15:38,735 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 19:15:38,735 INFO L195 NwaCegarLoop]: trace histogram [9, 8, 8, 5, 4, 4, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-12-02 19:15:38,739 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_da5dfcc8-f7a4-4d22-a963-15355fed9e59/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (16)] Ended with exit code 0 [2023-12-02 19:15:38,935 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 16 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_da5dfcc8-f7a4-4d22-a963-15355fed9e59/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable14 [2023-12-02 19:15:38,936 INFO L420 AbstractCegarLoop]: === Iteration 16 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 19:15:38,936 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 19:15:38,936 INFO L85 PathProgramCache]: Analyzing trace with hash 1618080332, now seen corresponding path program 2 times [2023-12-02 19:15:38,936 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 19:15:38,936 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [48659106] [2023-12-02 19:15:38,936 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 19:15:38,936 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 19:15:38,945 ERROR L246 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2023-12-02 19:15:38,945 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1083460435] [2023-12-02 19:15:38,945 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2023-12-02 19:15:38,945 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 19:15:38,945 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_da5dfcc8-f7a4-4d22-a963-15355fed9e59/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 19:15:38,946 INFO L229 MonitoredProcess]: Starting monitored process 17 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_da5dfcc8-f7a4-4d22-a963-15355fed9e59/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 19:15:38,947 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_da5dfcc8-f7a4-4d22-a963-15355fed9e59/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (17)] Waiting until timeout for monitored process [2023-12-02 19:15:38,998 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2023-12-02 19:15:38,998 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-12-02 19:15:38,999 INFO L262 TraceCheckSpWp]: Trace formula consists of 134 conjuncts, 8 conjunts are in the unsatisfiable core [2023-12-02 19:15:39,000 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 19:15:39,040 INFO L134 CoverageAnalysis]: Checked inductivity of 182 backedges. 45 proven. 5 refuted. 0 times theorem prover too weak. 132 trivial. 0 not checked. [2023-12-02 19:15:39,041 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-12-02 19:15:39,093 INFO L134 CoverageAnalysis]: Checked inductivity of 182 backedges. 45 proven. 5 refuted. 0 times theorem prover too weak. 132 trivial. 0 not checked. [2023-12-02 19:15:39,093 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 19:15:39,093 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [48659106] [2023-12-02 19:15:39,094 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2023-12-02 19:15:39,094 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1083460435] [2023-12-02 19:15:39,094 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1083460435] provided 0 perfect and 2 imperfect interpolant sequences [2023-12-02 19:15:39,094 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1641945983] [2023-12-02 19:15:39,096 INFO L159 IcfgInterpreter]: Started Sifa with 28 locations of interest [2023-12-02 19:15:39,096 INFO L166 IcfgInterpreter]: Building call graph [2023-12-02 19:15:39,096 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-12-02 19:15:39,096 INFO L176 IcfgInterpreter]: Starting interpretation [2023-12-02 19:15:39,096 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-12-02 19:15:42,916 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 1 for LOIs [2023-12-02 19:15:42,919 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 3 for LOIs [2023-12-02 19:15:42,920 INFO L180 IcfgInterpreter]: Interpretation finished [2023-12-02 19:15:43,345 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '15541#(and (= |__VERIFIER_assert_#in~cond| 0) (= __VERIFIER_assert_~cond 0))' at error location [2023-12-02 19:15:43,345 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-12-02 19:15:43,345 INFO L185 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2023-12-02 19:15:43,345 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8] total 8 [2023-12-02 19:15:43,345 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1905243246] [2023-12-02 19:15:43,345 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2023-12-02 19:15:43,345 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2023-12-02 19:15:43,346 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 19:15:43,346 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2023-12-02 19:15:43,346 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=78, Invalid=522, Unknown=0, NotChecked=0, Total=600 [2023-12-02 19:15:43,346 INFO L87 Difference]: Start difference. First operand 798 states and 1207 transitions. Second operand has 8 states, 8 states have (on average 4.125) internal successors, (33), 8 states have internal predecessors, (33), 3 states have call successors, (13), 2 states have call predecessors, (13), 1 states have return successors, (12), 2 states have call predecessors, (12), 2 states have call successors, (12) [2023-12-02 19:15:44,938 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 19:15:44,938 INFO L93 Difference]: Finished difference Result 931 states and 1407 transitions. [2023-12-02 19:15:44,938 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2023-12-02 19:15:44,938 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 8 states have (on average 4.125) internal successors, (33), 8 states have internal predecessors, (33), 3 states have call successors, (13), 2 states have call predecessors, (13), 1 states have return successors, (12), 2 states have call predecessors, (12), 2 states have call successors, (12) Word has length 86 [2023-12-02 19:15:44,939 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 19:15:44,944 INFO L225 Difference]: With dead ends: 931 [2023-12-02 19:15:44,944 INFO L226 Difference]: Without dead ends: 924 [2023-12-02 19:15:44,945 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 270 GetRequests, 231 SyntacticMatches, 5 SemanticMatches, 34 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 239 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=158, Invalid=1102, Unknown=0, NotChecked=0, Total=1260 [2023-12-02 19:15:44,946 INFO L413 NwaCegarLoop]: 56 mSDtfsCounter, 56 mSDsluCounter, 241 mSDsCounter, 0 mSdLazyCounter, 156 mSolverCounterSat, 44 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 60 SdHoareTripleChecker+Valid, 297 SdHoareTripleChecker+Invalid, 200 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 44 IncrementalHoareTripleChecker+Valid, 156 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-12-02 19:15:44,946 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [60 Valid, 297 Invalid, 200 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [44 Valid, 156 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-12-02 19:15:44,948 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 924 states. [2023-12-02 19:15:46,052 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 924 to 753. [2023-12-02 19:15:46,053 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 753 states, 407 states have (on average 1.2653562653562653) internal successors, (515), 410 states have internal predecessors, (515), 317 states have call successors, (317), 28 states have call predecessors, (317), 28 states have return successors, (316), 314 states have call predecessors, (316), 316 states have call successors, (316) [2023-12-02 19:15:46,057 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 753 states to 753 states and 1148 transitions. [2023-12-02 19:15:46,057 INFO L78 Accepts]: Start accepts. Automaton has 753 states and 1148 transitions. Word has length 86 [2023-12-02 19:15:46,057 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 19:15:46,057 INFO L495 AbstractCegarLoop]: Abstraction has 753 states and 1148 transitions. [2023-12-02 19:15:46,058 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 8 states, 8 states have (on average 4.125) internal successors, (33), 8 states have internal predecessors, (33), 3 states have call successors, (13), 2 states have call predecessors, (13), 1 states have return successors, (12), 2 states have call predecessors, (12), 2 states have call successors, (12) [2023-12-02 19:15:46,058 INFO L276 IsEmpty]: Start isEmpty. Operand 753 states and 1148 transitions. [2023-12-02 19:15:46,059 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 99 [2023-12-02 19:15:46,059 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 19:15:46,059 INFO L195 NwaCegarLoop]: trace histogram [13, 12, 12, 4, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-12-02 19:15:46,065 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_da5dfcc8-f7a4-4d22-a963-15355fed9e59/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (17)] Ended with exit code 0 [2023-12-02 19:15:46,259 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 17 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_da5dfcc8-f7a4-4d22-a963-15355fed9e59/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable15 [2023-12-02 19:15:46,260 INFO L420 AbstractCegarLoop]: === Iteration 17 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 19:15:46,260 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 19:15:46,260 INFO L85 PathProgramCache]: Analyzing trace with hash 355863159, now seen corresponding path program 2 times [2023-12-02 19:15:46,260 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 19:15:46,260 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1359352715] [2023-12-02 19:15:46,260 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 19:15:46,260 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 19:15:46,267 ERROR L246 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2023-12-02 19:15:46,267 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [454782659] [2023-12-02 19:15:46,268 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2023-12-02 19:15:46,268 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 19:15:46,268 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_da5dfcc8-f7a4-4d22-a963-15355fed9e59/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 19:15:46,268 INFO L229 MonitoredProcess]: Starting monitored process 18 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_da5dfcc8-f7a4-4d22-a963-15355fed9e59/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 19:15:46,269 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_da5dfcc8-f7a4-4d22-a963-15355fed9e59/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (18)] Waiting until timeout for monitored process [2023-12-02 19:15:46,326 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 5 check-sat command(s) [2023-12-02 19:15:46,326 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-12-02 19:15:46,328 INFO L262 TraceCheckSpWp]: Trace formula consists of 185 conjuncts, 62 conjunts are in the unsatisfiable core [2023-12-02 19:15:46,330 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 19:15:47,237 INFO L134 CoverageAnalysis]: Checked inductivity of 327 backedges. 27 proven. 27 refuted. 0 times theorem prover too weak. 273 trivial. 0 not checked. [2023-12-02 19:15:47,237 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-12-02 19:15:49,960 INFO L134 CoverageAnalysis]: Checked inductivity of 327 backedges. 24 proven. 27 refuted. 0 times theorem prover too weak. 276 trivial. 0 not checked. [2023-12-02 19:15:49,961 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 19:15:49,961 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1359352715] [2023-12-02 19:15:49,961 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2023-12-02 19:15:49,961 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [454782659] [2023-12-02 19:15:49,961 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [454782659] provided 0 perfect and 2 imperfect interpolant sequences [2023-12-02 19:15:49,961 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [890700448] [2023-12-02 19:15:49,963 INFO L159 IcfgInterpreter]: Started Sifa with 28 locations of interest [2023-12-02 19:15:49,963 INFO L166 IcfgInterpreter]: Building call graph [2023-12-02 19:15:49,963 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-12-02 19:15:49,963 INFO L176 IcfgInterpreter]: Starting interpretation [2023-12-02 19:15:49,963 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-12-02 19:15:52,711 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 3 for LOIs [2023-12-02 19:15:52,714 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 3 for LOIs [2023-12-02 19:15:52,715 INFO L180 IcfgInterpreter]: Interpretation finished [2023-12-02 19:16:00,154 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '18944#(and (<= 1 |#StackHeapBarrier|) (= |__VERIFIER_assert_#in~cond| 0) (= __VERIFIER_assert_~cond 0))' at error location [2023-12-02 19:16:00,154 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-12-02 19:16:00,155 INFO L185 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2023-12-02 19:16:00,155 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 14] total 28 [2023-12-02 19:16:00,155 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [794118259] [2023-12-02 19:16:00,155 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2023-12-02 19:16:00,155 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 28 states [2023-12-02 19:16:00,155 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 19:16:00,156 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 28 interpolants. [2023-12-02 19:16:00,157 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=213, Invalid=1767, Unknown=0, NotChecked=0, Total=1980 [2023-12-02 19:16:00,157 INFO L87 Difference]: Start difference. First operand 753 states and 1148 transitions. Second operand has 28 states, 25 states have (on average 2.08) internal successors, (52), 25 states have internal predecessors, (52), 9 states have call successors, (30), 3 states have call predecessors, (30), 2 states have return successors, (29), 8 states have call predecessors, (29), 7 states have call successors, (29) [2023-12-02 19:16:22,805 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.16s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2023-12-02 19:16:50,357 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 19:16:50,357 INFO L93 Difference]: Finished difference Result 1076 states and 1635 transitions. [2023-12-02 19:16:50,358 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 68 states. [2023-12-02 19:16:50,358 INFO L78 Accepts]: Start accepts. Automaton has has 28 states, 25 states have (on average 2.08) internal successors, (52), 25 states have internal predecessors, (52), 9 states have call successors, (30), 3 states have call predecessors, (30), 2 states have return successors, (29), 8 states have call predecessors, (29), 7 states have call successors, (29) Word has length 98 [2023-12-02 19:16:50,358 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 19:16:50,365 INFO L225 Difference]: With dead ends: 1076 [2023-12-02 19:16:50,365 INFO L226 Difference]: Without dead ends: 1068 [2023-12-02 19:16:50,370 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 352 GetRequests, 230 SyntacticMatches, 19 SemanticMatches, 103 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4053 ImplicationChecksByTransitivity, 42.7s TimeCoverageRelationStatistics Valid=1578, Invalid=9342, Unknown=0, NotChecked=0, Total=10920 [2023-12-02 19:16:50,371 INFO L413 NwaCegarLoop]: 44 mSDtfsCounter, 262 mSDsluCounter, 711 mSDsCounter, 0 mSdLazyCounter, 1147 mSolverCounterSat, 274 mSolverCounterUnsat, 1 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 13.7s Time, 0 mProtectedPredicate, 0 mProtectedAction, 262 SdHoareTripleChecker+Valid, 755 SdHoareTripleChecker+Invalid, 1422 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 274 IncrementalHoareTripleChecker+Valid, 1147 IncrementalHoareTripleChecker+Invalid, 1 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 13.9s IncrementalHoareTripleChecker+Time [2023-12-02 19:16:50,371 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [262 Valid, 755 Invalid, 1422 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [274 Valid, 1147 Invalid, 1 Unknown, 0 Unchecked, 13.9s Time] [2023-12-02 19:16:50,373 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1068 states. [2023-12-02 19:16:51,753 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1068 to 897. [2023-12-02 19:16:51,755 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 897 states, 484 states have (on average 1.2644628099173554) internal successors, (612), 487 states have internal predecessors, (612), 377 states have call successors, (377), 35 states have call predecessors, (377), 35 states have return successors, (376), 374 states have call predecessors, (376), 376 states have call successors, (376) [2023-12-02 19:16:51,761 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 897 states to 897 states and 1365 transitions. [2023-12-02 19:16:51,762 INFO L78 Accepts]: Start accepts. Automaton has 897 states and 1365 transitions. Word has length 98 [2023-12-02 19:16:51,762 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 19:16:51,762 INFO L495 AbstractCegarLoop]: Abstraction has 897 states and 1365 transitions. [2023-12-02 19:16:51,762 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 28 states, 25 states have (on average 2.08) internal successors, (52), 25 states have internal predecessors, (52), 9 states have call successors, (30), 3 states have call predecessors, (30), 2 states have return successors, (29), 8 states have call predecessors, (29), 7 states have call successors, (29) [2023-12-02 19:16:51,762 INFO L276 IsEmpty]: Start isEmpty. Operand 897 states and 1365 transitions. [2023-12-02 19:16:51,765 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 112 [2023-12-02 19:16:51,765 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 19:16:51,765 INFO L195 NwaCegarLoop]: trace histogram [14, 13, 13, 5, 4, 4, 4, 4, 4, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-12-02 19:16:51,770 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_da5dfcc8-f7a4-4d22-a963-15355fed9e59/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (18)] Forceful destruction successful, exit code 0 [2023-12-02 19:16:51,966 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 18 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_da5dfcc8-f7a4-4d22-a963-15355fed9e59/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable16 [2023-12-02 19:16:51,966 INFO L420 AbstractCegarLoop]: === Iteration 18 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 19:16:51,966 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 19:16:51,967 INFO L85 PathProgramCache]: Analyzing trace with hash 1435979099, now seen corresponding path program 1 times [2023-12-02 19:16:51,967 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 19:16:51,967 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1707631931] [2023-12-02 19:16:51,967 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 19:16:51,967 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 19:16:51,977 ERROR L246 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2023-12-02 19:16:51,977 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [693954057] [2023-12-02 19:16:51,977 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 19:16:51,977 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 19:16:51,977 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_da5dfcc8-f7a4-4d22-a963-15355fed9e59/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 19:16:51,978 INFO L229 MonitoredProcess]: Starting monitored process 19 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_da5dfcc8-f7a4-4d22-a963-15355fed9e59/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 19:16:51,979 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_da5dfcc8-f7a4-4d22-a963-15355fed9e59/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (19)] Waiting until timeout for monitored process [2023-12-02 19:16:52,058 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 19:16:52,061 INFO L262 TraceCheckSpWp]: Trace formula consists of 278 conjuncts, 82 conjunts are in the unsatisfiable core [2023-12-02 19:16:52,064 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 19:16:53,312 INFO L134 CoverageAnalysis]: Checked inductivity of 405 backedges. 63 proven. 57 refuted. 0 times theorem prover too weak. 285 trivial. 0 not checked. [2023-12-02 19:16:53,313 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-12-02 19:16:57,819 INFO L134 CoverageAnalysis]: Checked inductivity of 405 backedges. 62 proven. 55 refuted. 0 times theorem prover too weak. 288 trivial. 0 not checked. [2023-12-02 19:16:57,820 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 19:16:57,820 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1707631931] [2023-12-02 19:16:57,820 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2023-12-02 19:16:57,820 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [693954057] [2023-12-02 19:16:57,820 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [693954057] provided 0 perfect and 2 imperfect interpolant sequences [2023-12-02 19:16:57,820 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [67669087] [2023-12-02 19:16:57,821 INFO L159 IcfgInterpreter]: Started Sifa with 27 locations of interest [2023-12-02 19:16:57,821 INFO L166 IcfgInterpreter]: Building call graph [2023-12-02 19:16:57,822 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-12-02 19:16:57,822 INFO L176 IcfgInterpreter]: Starting interpretation [2023-12-02 19:16:57,822 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-12-02 19:17:00,134 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 9 for LOIs [2023-12-02 19:17:00,139 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 3 for LOIs [2023-12-02 19:17:00,140 INFO L180 IcfgInterpreter]: Interpretation finished [2023-12-02 19:17:05,378 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '23002#(and (= |__VERIFIER_assert_#in~cond| 0) (= __VERIFIER_assert_~cond 0))' at error location [2023-12-02 19:17:05,378 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-12-02 19:17:05,378 INFO L185 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2023-12-02 19:17:05,378 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [21, 18] total 36 [2023-12-02 19:17:05,378 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [585539909] [2023-12-02 19:17:05,378 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2023-12-02 19:17:05,379 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 36 states [2023-12-02 19:17:05,379 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 19:17:05,379 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 36 interpolants. [2023-12-02 19:17:05,380 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=325, Invalid=2431, Unknown=0, NotChecked=0, Total=2756 [2023-12-02 19:17:05,380 INFO L87 Difference]: Start difference. First operand 897 states and 1365 transitions. Second operand has 36 states, 33 states have (on average 2.212121212121212) internal successors, (73), 32 states have internal predecessors, (73), 12 states have call successors, (33), 3 states have call predecessors, (33), 3 states have return successors, (32), 10 states have call predecessors, (32), 10 states have call successors, (32) [2023-12-02 19:17:25,279 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 19:17:25,279 INFO L93 Difference]: Finished difference Result 1114 states and 1661 transitions. [2023-12-02 19:17:25,279 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 49 states. [2023-12-02 19:17:25,280 INFO L78 Accepts]: Start accepts. Automaton has has 36 states, 33 states have (on average 2.212121212121212) internal successors, (73), 32 states have internal predecessors, (73), 12 states have call successors, (33), 3 states have call predecessors, (33), 3 states have return successors, (32), 10 states have call predecessors, (32), 10 states have call successors, (32) Word has length 111 [2023-12-02 19:17:25,280 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 19:17:25,285 INFO L225 Difference]: With dead ends: 1114 [2023-12-02 19:17:25,285 INFO L226 Difference]: Without dead ends: 1112 [2023-12-02 19:17:25,287 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 371 GetRequests, 280 SyntacticMatches, 1 SemanticMatches, 90 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2448 ImplicationChecksByTransitivity, 19.1s TimeCoverageRelationStatistics Valid=1289, Invalid=7083, Unknown=0, NotChecked=0, Total=8372 [2023-12-02 19:17:25,287 INFO L413 NwaCegarLoop]: 41 mSDtfsCounter, 275 mSDsluCounter, 606 mSDsCounter, 0 mSdLazyCounter, 1018 mSolverCounterSat, 308 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 5.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 275 SdHoareTripleChecker+Valid, 647 SdHoareTripleChecker+Invalid, 1326 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 308 IncrementalHoareTripleChecker+Valid, 1018 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 5.6s IncrementalHoareTripleChecker+Time [2023-12-02 19:17:25,288 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [275 Valid, 647 Invalid, 1326 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [308 Valid, 1018 Invalid, 0 Unknown, 0 Unchecked, 5.6s Time] [2023-12-02 19:17:25,289 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1112 states. [2023-12-02 19:17:27,153 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1112 to 1058. [2023-12-02 19:17:27,154 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1058 states, 581 states have (on average 1.2478485370051635) internal successors, (725), 589 states have internal predecessors, (725), 432 states have call successors, (432), 44 states have call predecessors, (432), 44 states have return successors, (431), 424 states have call predecessors, (431), 431 states have call successors, (431) [2023-12-02 19:17:27,159 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1058 states to 1058 states and 1588 transitions. [2023-12-02 19:17:27,159 INFO L78 Accepts]: Start accepts. Automaton has 1058 states and 1588 transitions. Word has length 111 [2023-12-02 19:17:27,159 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 19:17:27,159 INFO L495 AbstractCegarLoop]: Abstraction has 1058 states and 1588 transitions. [2023-12-02 19:17:27,160 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 36 states, 33 states have (on average 2.212121212121212) internal successors, (73), 32 states have internal predecessors, (73), 12 states have call successors, (33), 3 states have call predecessors, (33), 3 states have return successors, (32), 10 states have call predecessors, (32), 10 states have call successors, (32) [2023-12-02 19:17:27,160 INFO L276 IsEmpty]: Start isEmpty. Operand 1058 states and 1588 transitions. [2023-12-02 19:17:27,162 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 126 [2023-12-02 19:17:27,162 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 19:17:27,162 INFO L195 NwaCegarLoop]: trace histogram [17, 16, 16, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 3, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-12-02 19:17:27,168 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_da5dfcc8-f7a4-4d22-a963-15355fed9e59/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (19)] Ended with exit code 0 [2023-12-02 19:17:27,362 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 19 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_da5dfcc8-f7a4-4d22-a963-15355fed9e59/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable17 [2023-12-02 19:17:27,363 INFO L420 AbstractCegarLoop]: === Iteration 19 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 19:17:27,363 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 19:17:27,363 INFO L85 PathProgramCache]: Analyzing trace with hash -1702861936, now seen corresponding path program 3 times [2023-12-02 19:17:27,363 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 19:17:27,363 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1207627666] [2023-12-02 19:17:27,364 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 19:17:27,364 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 19:17:27,373 ERROR L246 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2023-12-02 19:17:27,373 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [2104443577] [2023-12-02 19:17:27,373 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2023-12-02 19:17:27,373 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 19:17:27,373 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_da5dfcc8-f7a4-4d22-a963-15355fed9e59/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 19:17:27,374 INFO L229 MonitoredProcess]: Starting monitored process 20 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_da5dfcc8-f7a4-4d22-a963-15355fed9e59/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 19:17:27,375 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_da5dfcc8-f7a4-4d22-a963-15355fed9e59/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (20)] Waiting until timeout for monitored process [2023-12-02 19:17:27,459 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2023-12-02 19:17:27,459 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-12-02 19:17:27,461 INFO L262 TraceCheckSpWp]: Trace formula consists of 301 conjuncts, 88 conjunts are in the unsatisfiable core [2023-12-02 19:17:27,465 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 19:17:28,850 INFO L134 CoverageAnalysis]: Checked inductivity of 580 backedges. 70 proven. 66 refuted. 0 times theorem prover too weak. 444 trivial. 0 not checked. [2023-12-02 19:17:28,850 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-12-02 19:17:39,257 INFO L134 CoverageAnalysis]: Checked inductivity of 580 backedges. 70 proven. 63 refuted. 0 times theorem prover too weak. 447 trivial. 0 not checked. [2023-12-02 19:17:39,258 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 19:17:39,258 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1207627666] [2023-12-02 19:17:39,258 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2023-12-02 19:17:39,258 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2104443577] [2023-12-02 19:17:39,258 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2104443577] provided 0 perfect and 2 imperfect interpolant sequences [2023-12-02 19:17:39,258 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [529370768] [2023-12-02 19:17:39,260 INFO L159 IcfgInterpreter]: Started Sifa with 28 locations of interest [2023-12-02 19:17:39,260 INFO L166 IcfgInterpreter]: Building call graph [2023-12-02 19:17:39,260 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-12-02 19:17:39,260 INFO L176 IcfgInterpreter]: Starting interpretation [2023-12-02 19:17:39,260 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-12-02 19:17:41,554 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 9 for LOIs [2023-12-02 19:17:41,558 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 3 for LOIs [2023-12-02 19:17:41,559 INFO L180 IcfgInterpreter]: Interpretation finished [2023-12-02 19:17:45,882 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '27412#(and (= |__VERIFIER_assert_#in~cond| 0) (= __VERIFIER_assert_~cond 0))' at error location [2023-12-02 19:17:45,882 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-12-02 19:17:45,882 INFO L185 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2023-12-02 19:17:45,882 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [21, 19] total 37 [2023-12-02 19:17:45,883 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1872648655] [2023-12-02 19:17:45,883 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2023-12-02 19:17:45,883 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 37 states [2023-12-02 19:17:45,883 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 19:17:45,884 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 37 interpolants. [2023-12-02 19:17:45,885 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=304, Invalid=2776, Unknown=0, NotChecked=0, Total=3080 [2023-12-02 19:17:45,885 INFO L87 Difference]: Start difference. First operand 1058 states and 1588 transitions. Second operand has 37 states, 34 states have (on average 2.1176470588235294) internal successors, (72), 35 states have internal predecessors, (72), 13 states have call successors, (41), 3 states have call predecessors, (41), 3 states have return successors, (40), 11 states have call predecessors, (40), 11 states have call successors, (40) [2023-12-02 19:17:54,450 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2023-12-02 19:18:16,277 WARN L293 SmtUtils]: Spent 7.45s on a formula simplification that was a NOOP. DAG size: 106 (called from [L 391] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2023-12-02 19:18:48,227 WARN L293 SmtUtils]: Spent 5.20s on a formula simplification. DAG size of input: 108 DAG size of output: 105 (called from [L 391] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2023-12-02 19:19:00,268 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.33s for a HTC check with result INVALID. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2023-12-02 19:19:09,497 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 19:19:09,497 INFO L93 Difference]: Finished difference Result 1556 states and 2361 transitions. [2023-12-02 19:19:09,498 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 86 states. [2023-12-02 19:19:09,498 INFO L78 Accepts]: Start accepts. Automaton has has 37 states, 34 states have (on average 2.1176470588235294) internal successors, (72), 35 states have internal predecessors, (72), 13 states have call successors, (41), 3 states have call predecessors, (41), 3 states have return successors, (40), 11 states have call predecessors, (40), 11 states have call successors, (40) Word has length 125 [2023-12-02 19:19:09,499 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 19:19:09,506 INFO L225 Difference]: With dead ends: 1556 [2023-12-02 19:19:09,506 INFO L226 Difference]: Without dead ends: 1548 [2023-12-02 19:19:09,509 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 450 GetRequests, 319 SyntacticMatches, 1 SemanticMatches, 130 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5338 ImplicationChecksByTransitivity, 66.8s TimeCoverageRelationStatistics Valid=2464, Invalid=14828, Unknown=0, NotChecked=0, Total=17292 [2023-12-02 19:19:09,509 INFO L413 NwaCegarLoop]: 57 mSDtfsCounter, 331 mSDsluCounter, 1111 mSDsCounter, 0 mSdLazyCounter, 1931 mSolverCounterSat, 405 mSolverCounterUnsat, 1 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 20.9s Time, 0 mProtectedPredicate, 0 mProtectedAction, 340 SdHoareTripleChecker+Valid, 1168 SdHoareTripleChecker+Invalid, 2337 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 405 IncrementalHoareTripleChecker+Valid, 1931 IncrementalHoareTripleChecker+Invalid, 1 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 21.2s IncrementalHoareTripleChecker+Time [2023-12-02 19:19:09,509 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [340 Valid, 1168 Invalid, 2337 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [405 Valid, 1931 Invalid, 1 Unknown, 0 Unchecked, 21.2s Time] [2023-12-02 19:19:09,511 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1548 states. [2023-12-02 19:19:12,396 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1548 to 1347. [2023-12-02 19:19:12,398 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1347 states, 748 states have (on average 1.2459893048128343) internal successors, (932), 758 states have internal predecessors, (932), 548 states have call successors, (548), 50 states have call predecessors, (548), 50 states have return successors, (547), 538 states have call predecessors, (547), 547 states have call successors, (547) [2023-12-02 19:19:12,406 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1347 states to 1347 states and 2027 transitions. [2023-12-02 19:19:12,406 INFO L78 Accepts]: Start accepts. Automaton has 1347 states and 2027 transitions. Word has length 125 [2023-12-02 19:19:12,406 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 19:19:12,406 INFO L495 AbstractCegarLoop]: Abstraction has 1347 states and 2027 transitions. [2023-12-02 19:19:12,407 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 37 states, 34 states have (on average 2.1176470588235294) internal successors, (72), 35 states have internal predecessors, (72), 13 states have call successors, (41), 3 states have call predecessors, (41), 3 states have return successors, (40), 11 states have call predecessors, (40), 11 states have call successors, (40) [2023-12-02 19:19:12,407 INFO L276 IsEmpty]: Start isEmpty. Operand 1347 states and 2027 transitions. [2023-12-02 19:19:12,411 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 126 [2023-12-02 19:19:12,411 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 19:19:12,411 INFO L195 NwaCegarLoop]: trace histogram [17, 16, 16, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 3, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-12-02 19:19:12,417 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_da5dfcc8-f7a4-4d22-a963-15355fed9e59/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (20)] Ended with exit code 0 [2023-12-02 19:19:12,611 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable18,20 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_da5dfcc8-f7a4-4d22-a963-15355fed9e59/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 19:19:12,612 INFO L420 AbstractCegarLoop]: === Iteration 20 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 19:19:12,612 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 19:19:12,612 INFO L85 PathProgramCache]: Analyzing trace with hash -1054120344, now seen corresponding path program 4 times [2023-12-02 19:19:12,612 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 19:19:12,612 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1124026966] [2023-12-02 19:19:12,612 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 19:19:12,612 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 19:19:12,621 ERROR L246 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2023-12-02 19:19:12,621 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [2103433598] [2023-12-02 19:19:12,621 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2023-12-02 19:19:12,622 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 19:19:12,622 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_da5dfcc8-f7a4-4d22-a963-15355fed9e59/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 19:19:12,622 INFO L229 MonitoredProcess]: Starting monitored process 21 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_da5dfcc8-f7a4-4d22-a963-15355fed9e59/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 19:19:12,623 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_da5dfcc8-f7a4-4d22-a963-15355fed9e59/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (21)] Waiting until timeout for monitored process [2023-12-02 19:19:12,704 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 19:19:12,707 INFO L262 TraceCheckSpWp]: Trace formula consists of 301 conjuncts, 88 conjunts are in the unsatisfiable core [2023-12-02 19:19:12,710 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 19:19:14,057 INFO L134 CoverageAnalysis]: Checked inductivity of 580 backedges. 72 proven. 64 refuted. 0 times theorem prover too weak. 444 trivial. 0 not checked. [2023-12-02 19:19:14,057 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-12-02 19:19:28,170 INFO L134 CoverageAnalysis]: Checked inductivity of 580 backedges. 70 proven. 63 refuted. 0 times theorem prover too weak. 447 trivial. 0 not checked. [2023-12-02 19:19:28,170 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 19:19:28,171 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1124026966] [2023-12-02 19:19:28,171 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2023-12-02 19:19:28,171 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2103433598] [2023-12-02 19:19:28,171 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2103433598] provided 0 perfect and 2 imperfect interpolant sequences [2023-12-02 19:19:28,171 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1544857161] [2023-12-02 19:19:28,172 INFO L159 IcfgInterpreter]: Started Sifa with 28 locations of interest [2023-12-02 19:19:28,173 INFO L166 IcfgInterpreter]: Building call graph [2023-12-02 19:19:28,173 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-12-02 19:19:28,173 INFO L176 IcfgInterpreter]: Starting interpretation [2023-12-02 19:19:28,173 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-12-02 19:19:30,534 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 1 for LOIs [2023-12-02 19:19:30,537 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 3 for LOIs [2023-12-02 19:19:30,538 INFO L180 IcfgInterpreter]: Interpretation finished [2023-12-02 19:19:40,176 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '33109#(and (= |__VERIFIER_assert_#in~cond| 0) (= __VERIFIER_assert_~cond 0))' at error location [2023-12-02 19:19:40,176 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-12-02 19:19:40,176 INFO L185 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2023-12-02 19:19:40,176 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [21, 19] total 37 [2023-12-02 19:19:40,176 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [839478262] [2023-12-02 19:19:40,177 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2023-12-02 19:19:40,177 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 37 states [2023-12-02 19:19:40,177 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 19:19:40,178 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 37 interpolants. [2023-12-02 19:19:40,179 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=294, Invalid=2461, Unknown=1, NotChecked=0, Total=2756 [2023-12-02 19:19:40,179 INFO L87 Difference]: Start difference. First operand 1347 states and 2027 transitions. Second operand has 37 states, 34 states have (on average 2.088235294117647) internal successors, (71), 35 states have internal predecessors, (71), 13 states have call successors, (39), 3 states have call predecessors, (39), 3 states have return successors, (38), 11 states have call predecessors, (38), 11 states have call successors, (38) [2023-12-02 19:20:04,216 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2023-12-02 19:20:06,332 WARN L539 Checker$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 19:20:13,726 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.88s for a HTC check with result INVALID. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2023-12-02 19:20:20,790 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2023-12-02 19:20:22,894 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2023-12-02 19:20:48,787 WARN L293 SmtUtils]: Spent 8.54s on a formula simplification that was a NOOP. DAG size: 121 (called from [L 391] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2023-12-02 19:20:52,403 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2023-12-02 19:21:27,860 WARN L293 SmtUtils]: Spent 16.55s on a formula simplification. DAG size of input: 115 DAG size of output: 113 (called from [L 391] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2023-12-02 19:21:58,066 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 19:21:58,066 INFO L93 Difference]: Finished difference Result 1600 states and 2383 transitions. [2023-12-02 19:21:58,066 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 74 states. [2023-12-02 19:21:58,067 INFO L78 Accepts]: Start accepts. Automaton has has 37 states, 34 states have (on average 2.088235294117647) internal successors, (71), 35 states have internal predecessors, (71), 13 states have call successors, (39), 3 states have call predecessors, (39), 3 states have return successors, (38), 11 states have call predecessors, (38), 11 states have call successors, (38) Word has length 125 [2023-12-02 19:21:58,067 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 19:21:58,076 INFO L225 Difference]: With dead ends: 1600 [2023-12-02 19:21:58,076 INFO L226 Difference]: Without dead ends: 1592 [2023-12-02 19:21:58,079 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 438 GetRequests, 322 SyntacticMatches, 1 SemanticMatches, 115 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3967 ImplicationChecksByTransitivity, 110.9s TimeCoverageRelationStatistics Valid=2173, Invalid=11397, Unknown=2, NotChecked=0, Total=13572 [2023-12-02 19:21:58,080 INFO L413 NwaCegarLoop]: 56 mSDtfsCounter, 321 mSDsluCounter, 1199 mSDsCounter, 0 mSdLazyCounter, 1976 mSolverCounterSat, 403 mSolverCounterUnsat, 5 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 38.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 321 SdHoareTripleChecker+Valid, 1255 SdHoareTripleChecker+Invalid, 2384 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 403 IncrementalHoareTripleChecker+Valid, 1976 IncrementalHoareTripleChecker+Invalid, 5 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 38.6s IncrementalHoareTripleChecker+Time [2023-12-02 19:21:58,080 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [321 Valid, 1255 Invalid, 2384 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [403 Valid, 1976 Invalid, 5 Unknown, 0 Unchecked, 38.6s Time] [2023-12-02 19:21:58,082 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1592 states. [2023-12-02 19:22:02,547 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1592 to 1502. [2023-12-02 19:22:02,550 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1502 states, 831 states have (on average 1.2515042117930204) internal successors, (1040), 840 states have internal predecessors, (1040), 613 states have call successors, (613), 57 states have call predecessors, (613), 57 states have return successors, (612), 604 states have call predecessors, (612), 612 states have call successors, (612) [2023-12-02 19:22:02,558 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1502 states to 1502 states and 2265 transitions. [2023-12-02 19:22:02,558 INFO L78 Accepts]: Start accepts. Automaton has 1502 states and 2265 transitions. Word has length 125 [2023-12-02 19:22:02,559 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 19:22:02,559 INFO L495 AbstractCegarLoop]: Abstraction has 1502 states and 2265 transitions. [2023-12-02 19:22:02,559 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 37 states, 34 states have (on average 2.088235294117647) internal successors, (71), 35 states have internal predecessors, (71), 13 states have call successors, (39), 3 states have call predecessors, (39), 3 states have return successors, (38), 11 states have call predecessors, (38), 11 states have call successors, (38) [2023-12-02 19:22:02,559 INFO L276 IsEmpty]: Start isEmpty. Operand 1502 states and 2265 transitions. [2023-12-02 19:22:02,562 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 131 [2023-12-02 19:22:02,563 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 19:22:02,563 INFO L195 NwaCegarLoop]: trace histogram [19, 18, 18, 5, 5, 5, 5, 5, 5, 4, 4, 4, 4, 3, 3, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-12-02 19:22:02,569 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_da5dfcc8-f7a4-4d22-a963-15355fed9e59/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (21)] Ended with exit code 0 [2023-12-02 19:22:02,763 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable19,21 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_da5dfcc8-f7a4-4d22-a963-15355fed9e59/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 19:22:02,763 INFO L420 AbstractCegarLoop]: === Iteration 21 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 19:22:02,764 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 19:22:02,764 INFO L85 PathProgramCache]: Analyzing trace with hash -939850601, now seen corresponding path program 2 times [2023-12-02 19:22:02,764 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 19:22:02,764 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1330556790] [2023-12-02 19:22:02,764 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 19:22:02,764 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 19:22:02,772 ERROR L246 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2023-12-02 19:22:02,772 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [959492612] [2023-12-02 19:22:02,773 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2023-12-02 19:22:02,773 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 19:22:02,773 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_da5dfcc8-f7a4-4d22-a963-15355fed9e59/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 19:22:02,774 INFO L229 MonitoredProcess]: Starting monitored process 22 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_da5dfcc8-f7a4-4d22-a963-15355fed9e59/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 19:22:02,775 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_da5dfcc8-f7a4-4d22-a963-15355fed9e59/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (22)] Waiting until timeout for monitored process [2023-12-02 19:22:02,842 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2023-12-02 19:22:02,842 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-12-02 19:22:02,843 INFO L262 TraceCheckSpWp]: Trace formula consists of 166 conjuncts, 32 conjunts are in the unsatisfiable core [2023-12-02 19:22:02,846 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 19:22:03,189 INFO L134 CoverageAnalysis]: Checked inductivity of 720 backedges. 98 proven. 34 refuted. 0 times theorem prover too weak. 588 trivial. 0 not checked. [2023-12-02 19:22:03,189 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-12-02 19:22:03,338 INFO L134 CoverageAnalysis]: Checked inductivity of 720 backedges. 84 proven. 10 refuted. 0 times theorem prover too weak. 626 trivial. 0 not checked. [2023-12-02 19:22:03,338 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 19:22:03,338 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1330556790] [2023-12-02 19:22:03,339 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2023-12-02 19:22:03,339 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [959492612] [2023-12-02 19:22:03,339 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [959492612] provided 0 perfect and 2 imperfect interpolant sequences [2023-12-02 19:22:03,339 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [448620651] [2023-12-02 19:22:03,340 INFO L159 IcfgInterpreter]: Started Sifa with 27 locations of interest [2023-12-02 19:22:03,340 INFO L166 IcfgInterpreter]: Building call graph [2023-12-02 19:22:03,340 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-12-02 19:22:03,340 INFO L176 IcfgInterpreter]: Starting interpretation [2023-12-02 19:22:03,340 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-12-02 19:22:06,237 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 3 for LOIs [2023-12-02 19:22:06,240 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 3 for LOIs [2023-12-02 19:22:06,241 INFO L180 IcfgInterpreter]: Interpretation finished [2023-12-02 19:22:07,396 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '39092#(and (<= 1 |#StackHeapBarrier|) (= |__VERIFIER_assert_#in~cond| 0) (= __VERIFIER_assert_~cond 0))' at error location [2023-12-02 19:22:07,396 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-12-02 19:22:07,396 INFO L185 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2023-12-02 19:22:07,397 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 7] total 19 [2023-12-02 19:22:07,397 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1357064798] [2023-12-02 19:22:07,397 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2023-12-02 19:22:07,397 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 19 states [2023-12-02 19:22:07,397 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 19:22:07,398 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2023-12-02 19:22:07,398 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=142, Invalid=1048, Unknown=0, NotChecked=0, Total=1190 [2023-12-02 19:22:07,399 INFO L87 Difference]: Start difference. First operand 1502 states and 2265 transitions. Second operand has 19 states, 18 states have (on average 2.7777777777777777) internal successors, (50), 18 states have internal predecessors, (50), 6 states have call successors, (23), 3 states have call predecessors, (23), 3 states have return successors, (23), 8 states have call predecessors, (23), 6 states have call successors, (23) [2023-12-02 19:22:13,679 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 19:22:13,679 INFO L93 Difference]: Finished difference Result 1632 states and 2459 transitions. [2023-12-02 19:22:13,680 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 24 states. [2023-12-02 19:22:13,680 INFO L78 Accepts]: Start accepts. Automaton has has 19 states, 18 states have (on average 2.7777777777777777) internal successors, (50), 18 states have internal predecessors, (50), 6 states have call successors, (23), 3 states have call predecessors, (23), 3 states have return successors, (23), 8 states have call predecessors, (23), 6 states have call successors, (23) Word has length 130 [2023-12-02 19:22:13,680 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 19:22:13,688 INFO L225 Difference]: With dead ends: 1632 [2023-12-02 19:22:13,688 INFO L226 Difference]: Without dead ends: 1630 [2023-12-02 19:22:13,689 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 411 GetRequests, 335 SyntacticMatches, 25 SemanticMatches, 51 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1544 ImplicationChecksByTransitivity, 1.6s TimeCoverageRelationStatistics Valid=307, Invalid=2449, Unknown=0, NotChecked=0, Total=2756 [2023-12-02 19:22:13,689 INFO L413 NwaCegarLoop]: 32 mSDtfsCounter, 93 mSDsluCounter, 300 mSDsCounter, 0 mSdLazyCounter, 427 mSolverCounterSat, 62 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 93 SdHoareTripleChecker+Valid, 332 SdHoareTripleChecker+Invalid, 489 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 62 IncrementalHoareTripleChecker+Valid, 427 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.7s IncrementalHoareTripleChecker+Time [2023-12-02 19:22:13,689 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [93 Valid, 332 Invalid, 489 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [62 Valid, 427 Invalid, 0 Unknown, 0 Unchecked, 0.7s Time] [2023-12-02 19:22:13,691 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1630 states. [2023-12-02 19:22:18,068 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1630 to 1518. [2023-12-02 19:22:18,071 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1518 states, 843 states have (on average 1.2479240806642942) internal successors, (1052), 852 states have internal predecessors, (1052), 613 states have call successors, (613), 61 states have call predecessors, (613), 61 states have return successors, (612), 604 states have call predecessors, (612), 612 states have call successors, (612) [2023-12-02 19:22:18,076 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1518 states to 1518 states and 2277 transitions. [2023-12-02 19:22:18,077 INFO L78 Accepts]: Start accepts. Automaton has 1518 states and 2277 transitions. Word has length 130 [2023-12-02 19:22:18,077 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 19:22:18,077 INFO L495 AbstractCegarLoop]: Abstraction has 1518 states and 2277 transitions. [2023-12-02 19:22:18,077 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 19 states, 18 states have (on average 2.7777777777777777) internal successors, (50), 18 states have internal predecessors, (50), 6 states have call successors, (23), 3 states have call predecessors, (23), 3 states have return successors, (23), 8 states have call predecessors, (23), 6 states have call successors, (23) [2023-12-02 19:22:18,077 INFO L276 IsEmpty]: Start isEmpty. Operand 1518 states and 2277 transitions. [2023-12-02 19:22:18,079 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 129 [2023-12-02 19:22:18,080 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 19:22:18,080 INFO L195 NwaCegarLoop]: trace histogram [17, 16, 16, 5, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 3, 3, 3, 3, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-12-02 19:22:18,085 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_da5dfcc8-f7a4-4d22-a963-15355fed9e59/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (22)] Ended with exit code 0 [2023-12-02 19:22:18,280 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 22 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_da5dfcc8-f7a4-4d22-a963-15355fed9e59/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable20 [2023-12-02 19:22:18,280 INFO L420 AbstractCegarLoop]: === Iteration 22 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 19:22:18,281 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 19:22:18,281 INFO L85 PathProgramCache]: Analyzing trace with hash 254217485, now seen corresponding path program 5 times [2023-12-02 19:22:18,281 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 19:22:18,281 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [80629141] [2023-12-02 19:22:18,281 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 19:22:18,281 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 19:22:18,291 ERROR L246 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2023-12-02 19:22:18,292 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1898154332] [2023-12-02 19:22:18,292 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2023-12-02 19:22:18,292 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 19:22:18,292 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_da5dfcc8-f7a4-4d22-a963-15355fed9e59/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 19:22:18,293 INFO L229 MonitoredProcess]: Starting monitored process 23 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_da5dfcc8-f7a4-4d22-a963-15355fed9e59/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 19:22:18,294 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_da5dfcc8-f7a4-4d22-a963-15355fed9e59/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (23)] Waiting until timeout for monitored process [2023-12-02 19:22:18,375 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 5 check-sat command(s) [2023-12-02 19:22:18,375 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-12-02 19:22:18,378 INFO L262 TraceCheckSpWp]: Trace formula consists of 235 conjuncts, 87 conjunts are in the unsatisfiable core [2023-12-02 19:22:18,381 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 19:22:19,933 INFO L134 CoverageAnalysis]: Checked inductivity of 590 backedges. 35 proven. 66 refuted. 0 times theorem prover too weak. 489 trivial. 0 not checked. [2023-12-02 19:22:19,933 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-12-02 19:22:25,415 INFO L134 CoverageAnalysis]: Checked inductivity of 590 backedges. 32 proven. 66 refuted. 0 times theorem prover too weak. 492 trivial. 0 not checked. [2023-12-02 19:22:25,416 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 19:22:25,416 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [80629141] [2023-12-02 19:22:25,416 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2023-12-02 19:22:25,416 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1898154332] [2023-12-02 19:22:25,416 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1898154332] provided 0 perfect and 2 imperfect interpolant sequences [2023-12-02 19:22:25,416 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1665812948] [2023-12-02 19:22:25,417 INFO L159 IcfgInterpreter]: Started Sifa with 28 locations of interest [2023-12-02 19:22:25,418 INFO L166 IcfgInterpreter]: Building call graph [2023-12-02 19:22:25,418 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-12-02 19:22:25,418 INFO L176 IcfgInterpreter]: Starting interpretation [2023-12-02 19:22:25,418 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-12-02 19:22:27,794 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 9 for LOIs [2023-12-02 19:22:27,799 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 3 for LOIs [2023-12-02 19:22:27,800 INFO L180 IcfgInterpreter]: Interpretation finished [2023-12-02 19:22:33,224 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '45081#(and (= |__VERIFIER_assert_#in~cond| 0) (= __VERIFIER_assert_~cond 0))' at error location [2023-12-02 19:22:33,224 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-12-02 19:22:33,224 INFO L185 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2023-12-02 19:22:33,224 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [21, 18] total 37 [2023-12-02 19:22:33,224 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1483845342] [2023-12-02 19:22:33,224 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2023-12-02 19:22:33,225 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 37 states [2023-12-02 19:22:33,225 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 19:22:33,226 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 37 interpolants. [2023-12-02 19:22:33,227 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=293, Invalid=2787, Unknown=0, NotChecked=0, Total=3080 [2023-12-02 19:22:33,227 INFO L87 Difference]: Start difference. First operand 1518 states and 2277 transitions. Second operand has 37 states, 34 states have (on average 2.1176470588235294) internal successors, (72), 34 states have internal predecessors, (72), 11 states have call successors, (38), 3 states have call predecessors, (38), 2 states have return successors, (37), 10 states have call predecessors, (37), 9 states have call successors, (37) [2023-12-02 19:23:58,235 WARN L293 SmtUtils]: Spent 5.01s on a formula simplification that was a NOOP. DAG size: 117 (called from [L 391] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2023-12-02 19:24:50,991 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 19:24:50,991 INFO L93 Difference]: Finished difference Result 2056 states and 3110 transitions. [2023-12-02 19:24:50,992 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 113 states. [2023-12-02 19:24:50,992 INFO L78 Accepts]: Start accepts. Automaton has has 37 states, 34 states have (on average 2.1176470588235294) internal successors, (72), 34 states have internal predecessors, (72), 11 states have call successors, (38), 3 states have call predecessors, (38), 2 states have return successors, (37), 10 states have call predecessors, (37), 9 states have call successors, (37) Word has length 128 [2023-12-02 19:24:50,992 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 19:24:51,001 INFO L225 Difference]: With dead ends: 2056 [2023-12-02 19:24:51,002 INFO L226 Difference]: Without dead ends: 2048 [2023-12-02 19:24:51,004 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 486 GetRequests, 328 SyntacticMatches, 1 SemanticMatches, 157 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8095 ImplicationChecksByTransitivity, 117.5s TimeCoverageRelationStatistics Valid=3681, Invalid=21441, Unknown=0, NotChecked=0, Total=25122 [2023-12-02 19:24:51,005 INFO L413 NwaCegarLoop]: 52 mSDtfsCounter, 455 mSDsluCounter, 1177 mSDsCounter, 0 mSdLazyCounter, 1974 mSolverCounterSat, 492 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 23.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 455 SdHoareTripleChecker+Valid, 1229 SdHoareTripleChecker+Invalid, 2466 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 492 IncrementalHoareTripleChecker+Valid, 1974 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 23.4s IncrementalHoareTripleChecker+Time [2023-12-02 19:24:51,005 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [455 Valid, 1229 Invalid, 2466 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [492 Valid, 1974 Invalid, 0 Unknown, 0 Unchecked, 23.4s Time] [2023-12-02 19:24:51,007 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2048 states. [2023-12-02 19:24:56,225 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2048 to 1703. [2023-12-02 19:24:56,228 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1703 states, 945 states have (on average 1.2507936507936508) internal successors, (1182), 955 states have internal predecessors, (1182), 691 states have call successors, (691), 66 states have call predecessors, (691), 66 states have return successors, (690), 681 states have call predecessors, (690), 690 states have call successors, (690) [2023-12-02 19:24:56,232 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1703 states to 1703 states and 2563 transitions. [2023-12-02 19:24:56,232 INFO L78 Accepts]: Start accepts. Automaton has 1703 states and 2563 transitions. Word has length 128 [2023-12-02 19:24:56,232 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 19:24:56,233 INFO L495 AbstractCegarLoop]: Abstraction has 1703 states and 2563 transitions. [2023-12-02 19:24:56,233 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 37 states, 34 states have (on average 2.1176470588235294) internal successors, (72), 34 states have internal predecessors, (72), 11 states have call successors, (38), 3 states have call predecessors, (38), 2 states have return successors, (37), 10 states have call predecessors, (37), 9 states have call successors, (37) [2023-12-02 19:24:56,233 INFO L276 IsEmpty]: Start isEmpty. Operand 1703 states and 2563 transitions. [2023-12-02 19:24:56,235 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 134 [2023-12-02 19:24:56,235 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 19:24:56,236 INFO L195 NwaCegarLoop]: trace histogram [17, 16, 16, 6, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 3, 3, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-12-02 19:24:56,241 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_da5dfcc8-f7a4-4d22-a963-15355fed9e59/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (23)] Ended with exit code 0 [2023-12-02 19:24:56,436 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 23 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_da5dfcc8-f7a4-4d22-a963-15355fed9e59/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable21 [2023-12-02 19:24:56,436 INFO L420 AbstractCegarLoop]: === Iteration 23 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 19:24:56,437 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 19:24:56,437 INFO L85 PathProgramCache]: Analyzing trace with hash -1309664975, now seen corresponding path program 6 times [2023-12-02 19:24:56,437 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 19:24:56,437 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [75756608] [2023-12-02 19:24:56,437 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 19:24:56,437 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 19:24:56,445 ERROR L246 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2023-12-02 19:24:56,445 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [599008033] [2023-12-02 19:24:56,446 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2023-12-02 19:24:56,446 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 19:24:56,446 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_da5dfcc8-f7a4-4d22-a963-15355fed9e59/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 19:24:56,447 INFO L229 MonitoredProcess]: Starting monitored process 24 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_da5dfcc8-f7a4-4d22-a963-15355fed9e59/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 19:24:56,447 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_da5dfcc8-f7a4-4d22-a963-15355fed9e59/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (24)] Waiting until timeout for monitored process [2023-12-02 19:24:56,534 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2023-12-02 19:24:56,534 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-12-02 19:24:56,537 INFO L262 TraceCheckSpWp]: Trace formula consists of 304 conjuncts, 108 conjunts are in the unsatisfiable core [2023-12-02 19:24:56,541 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 19:24:58,486 INFO L134 CoverageAnalysis]: Checked inductivity of 608 backedges. 72 proven. 92 refuted. 0 times theorem prover too weak. 444 trivial. 0 not checked. [2023-12-02 19:24:58,487 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-12-02 19:25:09,422 INFO L134 CoverageAnalysis]: Checked inductivity of 608 backedges. 70 proven. 91 refuted. 0 times theorem prover too weak. 447 trivial. 0 not checked. [2023-12-02 19:25:09,423 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 19:25:09,423 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [75756608] [2023-12-02 19:25:09,423 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2023-12-02 19:25:09,423 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [599008033] [2023-12-02 19:25:09,423 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [599008033] provided 0 perfect and 2 imperfect interpolant sequences [2023-12-02 19:25:09,423 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [154819603] [2023-12-02 19:25:09,425 INFO L159 IcfgInterpreter]: Started Sifa with 28 locations of interest [2023-12-02 19:25:09,425 INFO L166 IcfgInterpreter]: Building call graph [2023-12-02 19:25:09,425 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-12-02 19:25:09,425 INFO L176 IcfgInterpreter]: Starting interpretation [2023-12-02 19:25:09,425 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-12-02 19:25:11,713 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 1 for LOIs [2023-12-02 19:25:11,715 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 3 for LOIs [2023-12-02 19:25:11,716 INFO L180 IcfgInterpreter]: Interpretation finished [2023-12-02 19:25:17,636 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '52271#(and (= |__VERIFIER_assert_#in~cond| 0) (= __VERIFIER_assert_~cond 0))' at error location [2023-12-02 19:25:17,636 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-12-02 19:25:17,636 INFO L185 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2023-12-02 19:25:17,636 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [25, 23] total 45 [2023-12-02 19:25:17,636 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [18277662] [2023-12-02 19:25:17,637 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2023-12-02 19:25:17,637 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 45 states [2023-12-02 19:25:17,637 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 19:25:17,638 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 45 interpolants. [2023-12-02 19:25:17,638 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=449, Invalid=3211, Unknown=0, NotChecked=0, Total=3660 [2023-12-02 19:25:17,639 INFO L87 Difference]: Start difference. First operand 1703 states and 2563 transitions. Second operand has 45 states, 42 states have (on average 2.0714285714285716) internal successors, (87), 43 states have internal predecessors, (87), 13 states have call successors, (39), 3 states have call predecessors, (39), 3 states have return successors, (38), 11 states have call predecessors, (38), 11 states have call successors, (38) [2023-12-02 19:25:33,384 WARN L293 SmtUtils]: Spent 12.77s on a formula simplification that was a NOOP. DAG size: 149 (called from [L 391] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2023-12-02 19:25:45,070 WARN L293 SmtUtils]: Spent 7.01s on a formula simplification that was a NOOP. DAG size: 152 (called from [L 391] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2023-12-02 19:26:02,194 WARN L293 SmtUtils]: Spent 15.94s on a formula simplification that was a NOOP. DAG size: 160 (called from [L 391] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2023-12-02 19:26:10,830 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2023-12-02 19:26:12,833 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2023-12-02 19:26:14,790 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.96s for a HTC check with result INVALID. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2023-12-02 19:26:16,793 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2023-12-02 19:26:44,881 WARN L293 SmtUtils]: Spent 20.90s on a formula simplification that was a NOOP. DAG size: 151 (called from [L 391] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2023-12-02 19:26:46,485 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.53s for a HTC check with result INVALID. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2023-12-02 19:26:48,487 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2023-12-02 19:26:50,490 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2023-12-02 19:26:52,492 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2023-12-02 19:26:54,494 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2023-12-02 19:26:56,211 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.11s for a HTC check with result INVALID. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2023-12-02 19:26:58,273 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2023-12-02 19:27:13,335 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2023-12-02 19:27:15,337 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2023-12-02 19:27:17,016 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.66s for a HTC check with result INVALID. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2023-12-02 19:27:22,003 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2023-12-02 19:27:24,413 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.36s for a HTC check with result INVALID. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2023-12-02 19:27:46,334 WARN L293 SmtUtils]: Spent 21.55s on a formula simplification that was a NOOP. DAG size: 159 (called from [L 391] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate)