./Ultimate.py --spec ../../sv-benchmarks/c/properties/unreach-call.prp --file ../../sv-benchmarks/c/nla-digbench-scaling/fermat1-ll_valuebound50.c --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for ERROR reachability Using default analysis Version 527bcce2 Calling Ultimate with: /usr/lib/jvm/java-11-openjdk-amd64/bin/java -Dosgi.configuration.area=/tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7b1d0bc3-b8b1-4128-a81a-f02e0669ee61/bin/utaipan-verify-QoSU8krkJ5/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7b1d0bc3-b8b1-4128-a81a-f02e0669ee61/bin/utaipan-verify-QoSU8krkJ5/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7b1d0bc3-b8b1-4128-a81a-f02e0669ee61/bin/utaipan-verify-QoSU8krkJ5/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7b1d0bc3-b8b1-4128-a81a-f02e0669ee61/bin/utaipan-verify-QoSU8krkJ5/config/TaipanReach.xml -i ../../sv-benchmarks/c/nla-digbench-scaling/fermat1-ll_valuebound50.c -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7b1d0bc3-b8b1-4128-a81a-f02e0669ee61/bin/utaipan-verify-QoSU8krkJ5/config/svcomp-Reach-32bit-Taipan_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7b1d0bc3-b8b1-4128-a81a-f02e0669ee61/bin/utaipan-verify-QoSU8krkJ5 --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 0ac0f213d1d000e527ab073eb0dd4288784176d966909606abb71d9dc425fd71 --- Real Ultimate output --- This is Ultimate 0.2.3-dev-527bcce [2023-11-21 19:03:32,697 INFO L188 SettingsManager]: Resetting all preferences to default values... [2023-11-21 19:03:32,785 INFO L114 SettingsManager]: Loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7b1d0bc3-b8b1-4128-a81a-f02e0669ee61/bin/utaipan-verify-QoSU8krkJ5/config/svcomp-Reach-32bit-Taipan_Default.epf [2023-11-21 19:03:32,790 WARN L101 SettingsManager]: Preference file contains the following unknown settings: [2023-11-21 19:03:32,791 WARN L103 SettingsManager]: * de.uni_freiburg.informatik.ultimate.core.Log level for class [2023-11-21 19:03:32,821 INFO L130 SettingsManager]: Preferences different from defaults after loading the file: [2023-11-21 19:03:32,822 INFO L151 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2023-11-21 19:03:32,823 INFO L153 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2023-11-21 19:03:32,824 INFO L151 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2023-11-21 19:03:32,825 INFO L153 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2023-11-21 19:03:32,825 INFO L153 SettingsManager]: * User list type=DISABLED [2023-11-21 19:03:32,826 INFO L151 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2023-11-21 19:03:32,827 INFO L153 SettingsManager]: * Explicit value domain=true [2023-11-21 19:03:32,827 INFO L153 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2023-11-21 19:03:32,828 INFO L153 SettingsManager]: * Octagon Domain=false [2023-11-21 19:03:32,829 INFO L153 SettingsManager]: * Abstract domain=CompoundDomain [2023-11-21 19:03:32,830 INFO L153 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2023-11-21 19:03:32,830 INFO L153 SettingsManager]: * Use the RCFG-of-the-future interface=true [2023-11-21 19:03:32,831 INFO L153 SettingsManager]: * Interval Domain=false [2023-11-21 19:03:32,832 INFO L151 SettingsManager]: Preferences of Sifa differ from their defaults: [2023-11-21 19:03:32,832 INFO L153 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2023-11-21 19:03:32,833 INFO L153 SettingsManager]: * Simplification Technique=POLY_PAC [2023-11-21 19:03:32,834 INFO L151 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2023-11-21 19:03:32,835 INFO L153 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2023-11-21 19:03:32,835 INFO L153 SettingsManager]: * sizeof long=4 [2023-11-21 19:03:32,836 INFO L153 SettingsManager]: * Overapproximate operations on floating types=true [2023-11-21 19:03:32,837 INFO L153 SettingsManager]: * sizeof POINTER=4 [2023-11-21 19:03:32,837 INFO L153 SettingsManager]: * Check division by zero=IGNORE [2023-11-21 19:03:32,838 INFO L153 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2023-11-21 19:03:32,838 INFO L153 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2023-11-21 19:03:32,839 INFO L153 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2023-11-21 19:03:32,839 INFO L153 SettingsManager]: * sizeof long double=12 [2023-11-21 19:03:32,840 INFO L153 SettingsManager]: * Check if freed pointer was valid=false [2023-11-21 19:03:32,840 INFO L153 SettingsManager]: * Use constant arrays=true [2023-11-21 19:03:32,841 INFO L151 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2023-11-21 19:03:32,842 INFO L153 SettingsManager]: * Only consider context switches at boundaries of atomic blocks=true [2023-11-21 19:03:32,842 INFO L153 SettingsManager]: * SMT solver=External_DefaultMode [2023-11-21 19:03:32,843 INFO L153 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2023-11-21 19:03:32,843 INFO L151 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2023-11-21 19:03:32,844 INFO L153 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2023-11-21 19:03:32,845 INFO L153 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopHeads [2023-11-21 19:03:32,845 INFO L153 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2023-11-21 19:03:32,846 INFO L153 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2023-11-21 19:03:32,846 INFO L153 SettingsManager]: * Apply one-shot large block encoding in concurrent analysis=false [2023-11-21 19:03:32,847 INFO L153 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2023-11-21 19:03:32,847 INFO L153 SettingsManager]: * Trace refinement exception blacklist=NONE [2023-11-21 19:03:32,848 INFO L153 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2023-11-21 19:03:32,848 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_7b1d0bc3-b8b1-4128-a81a-f02e0669ee61/bin/utaipan-verify-QoSU8krkJ5/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7b1d0bc3-b8b1-4128-a81a-f02e0669ee61/bin/utaipan-verify-QoSU8krkJ5 Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> 0ac0f213d1d000e527ab073eb0dd4288784176d966909606abb71d9dc425fd71 [2023-11-21 19:03:33,108 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2023-11-21 19:03:33,143 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2023-11-21 19:03:33,146 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2023-11-21 19:03:33,149 INFO L270 PluginConnector]: Initializing CDTParser... [2023-11-21 19:03:33,150 INFO L274 PluginConnector]: CDTParser initialized [2023-11-21 19:03:33,152 INFO L431 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7b1d0bc3-b8b1-4128-a81a-f02e0669ee61/bin/utaipan-verify-QoSU8krkJ5/../../sv-benchmarks/c/nla-digbench-scaling/fermat1-ll_valuebound50.c [2023-11-21 19:03:36,594 INFO L533 CDTParser]: Created temporary CDT project at NULL [2023-11-21 19:03:36,853 INFO L384 CDTParser]: Found 1 translation units. [2023-11-21 19:03:36,854 INFO L180 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7b1d0bc3-b8b1-4128-a81a-f02e0669ee61/sv-benchmarks/c/nla-digbench-scaling/fermat1-ll_valuebound50.c [2023-11-21 19:03:36,863 INFO L427 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7b1d0bc3-b8b1-4128-a81a-f02e0669ee61/bin/utaipan-verify-QoSU8krkJ5/data/630a108c4/38981ba168f5462187ab951422e85d53/FLAG7165d5018 [2023-11-21 19:03:36,881 INFO L435 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7b1d0bc3-b8b1-4128-a81a-f02e0669ee61/bin/utaipan-verify-QoSU8krkJ5/data/630a108c4/38981ba168f5462187ab951422e85d53 [2023-11-21 19:03:36,884 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2023-11-21 19:03:36,887 INFO L133 ToolchainWalker]: Walking toolchain with 6 elements. [2023-11-21 19:03:36,889 INFO L112 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2023-11-21 19:03:36,889 INFO L270 PluginConnector]: Initializing CACSL2BoogieTranslator... [2023-11-21 19:03:36,895 INFO L274 PluginConnector]: CACSL2BoogieTranslator initialized [2023-11-21 19:03:36,896 INFO L184 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.11 07:03:36" (1/1) ... [2023-11-21 19:03:36,898 INFO L204 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@64bb12a6 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 07:03:36, skipping insertion in model container [2023-11-21 19:03:36,898 INFO L184 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.11 07:03:36" (1/1) ... [2023-11-21 19:03:36,926 INFO L177 MainTranslator]: Built tables and reachable declarations [2023-11-21 19:03:37,095 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_7b1d0bc3-b8b1-4128-a81a-f02e0669ee61/sv-benchmarks/c/nla-digbench-scaling/fermat1-ll_valuebound50.c[535,548] [2023-11-21 19:03:37,119 INFO L209 PostProcessor]: Analyzing one entry point: main [2023-11-21 19:03:37,132 INFO L202 MainTranslator]: Completed pre-run [2023-11-21 19:03:37,146 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_7b1d0bc3-b8b1-4128-a81a-f02e0669ee61/sv-benchmarks/c/nla-digbench-scaling/fermat1-ll_valuebound50.c[535,548] [2023-11-21 19:03:37,159 INFO L209 PostProcessor]: Analyzing one entry point: main [2023-11-21 19:03:37,176 INFO L206 MainTranslator]: Completed translation [2023-11-21 19:03:37,177 INFO L201 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 07:03:37 WrapperNode [2023-11-21 19:03:37,177 INFO L131 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2023-11-21 19:03:37,179 INFO L112 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2023-11-21 19:03:37,179 INFO L270 PluginConnector]: Initializing Boogie Procedure Inliner... [2023-11-21 19:03:37,179 INFO L274 PluginConnector]: Boogie Procedure Inliner initialized [2023-11-21 19:03:37,187 INFO L184 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 07:03:37" (1/1) ... [2023-11-21 19:03:37,195 INFO L184 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 07:03:37" (1/1) ... [2023-11-21 19:03:37,223 INFO L138 Inliner]: procedures = 14, calls = 15, calls flagged for inlining = 2, calls inlined = 2, statements flattened = 57 [2023-11-21 19:03:37,224 INFO L131 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2023-11-21 19:03:37,224 INFO L112 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2023-11-21 19:03:37,225 INFO L270 PluginConnector]: Initializing Boogie Preprocessor... [2023-11-21 19:03:37,225 INFO L274 PluginConnector]: Boogie Preprocessor initialized [2023-11-21 19:03:37,234 INFO L184 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 07:03:37" (1/1) ... [2023-11-21 19:03:37,234 INFO L184 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 07:03:37" (1/1) ... [2023-11-21 19:03:37,236 INFO L184 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 07:03:37" (1/1) ... [2023-11-21 19:03:37,236 INFO L184 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 07:03:37" (1/1) ... [2023-11-21 19:03:37,240 INFO L184 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 07:03:37" (1/1) ... [2023-11-21 19:03:37,245 INFO L184 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 07:03:37" (1/1) ... [2023-11-21 19:03:37,247 INFO L184 PluginConnector]: Executing the observer LTLStepAnnotator from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 07:03:37" (1/1) ... [2023-11-21 19:03:37,248 INFO L184 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 07:03:37" (1/1) ... [2023-11-21 19:03:37,251 INFO L131 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2023-11-21 19:03:37,252 INFO L112 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2023-11-21 19:03:37,252 INFO L270 PluginConnector]: Initializing RCFGBuilder... [2023-11-21 19:03:37,253 INFO L274 PluginConnector]: RCFGBuilder initialized [2023-11-21 19:03:37,254 INFO L184 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 07:03:37" (1/1) ... [2023-11-21 19:03:37,261 INFO L173 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2023-11-21 19:03:37,278 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7b1d0bc3-b8b1-4128-a81a-f02e0669ee61/bin/utaipan-verify-QoSU8krkJ5/z3 [2023-11-21 19:03:37,294 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7b1d0bc3-b8b1-4128-a81a-f02e0669ee61/bin/utaipan-verify-QoSU8krkJ5/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2023-11-21 19:03:37,317 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7b1d0bc3-b8b1-4128-a81a-f02e0669ee61/bin/utaipan-verify-QoSU8krkJ5/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2023-11-21 19:03:37,342 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2023-11-21 19:03:37,343 INFO L130 BoogieDeclarations]: Found specification of procedure assume_abort_if_not [2023-11-21 19:03:37,343 INFO L138 BoogieDeclarations]: Found implementation of procedure assume_abort_if_not [2023-11-21 19:03:37,343 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2023-11-21 19:03:37,343 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2023-11-21 19:03:37,343 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2023-11-21 19:03:37,344 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2023-11-21 19:03:37,344 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2023-11-21 19:03:37,418 INFO L240 CfgBuilder]: Building ICFG [2023-11-21 19:03:37,421 INFO L266 CfgBuilder]: Building CFG for each procedure with an implementation [2023-11-21 19:03:37,668 INFO L281 CfgBuilder]: Performing block encoding [2023-11-21 19:03:37,711 INFO L303 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2023-11-21 19:03:37,711 INFO L308 CfgBuilder]: Removed 3 assume(true) statements. [2023-11-21 19:03:37,713 INFO L201 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.11 07:03:37 BoogieIcfgContainer [2023-11-21 19:03:37,713 INFO L131 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2023-11-21 19:03:37,716 INFO L112 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2023-11-21 19:03:37,717 INFO L270 PluginConnector]: Initializing TraceAbstraction... [2023-11-21 19:03:37,720 INFO L274 PluginConnector]: TraceAbstraction initialized [2023-11-21 19:03:37,720 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 21.11 07:03:36" (1/3) ... [2023-11-21 19:03:37,721 INFO L204 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@5d5632f2 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.11 07:03:37, skipping insertion in model container [2023-11-21 19:03:37,721 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 07:03:37" (2/3) ... [2023-11-21 19:03:37,722 INFO L204 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@5d5632f2 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.11 07:03:37, skipping insertion in model container [2023-11-21 19:03:37,722 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.11 07:03:37" (3/3) ... [2023-11-21 19:03:37,723 INFO L112 eAbstractionObserver]: Analyzing ICFG fermat1-ll_valuebound50.c [2023-11-21 19:03:37,745 INFO L203 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2023-11-21 19:03:37,745 INFO L162 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2023-11-21 19:03:37,827 INFO L356 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2023-11-21 19:03:37,840 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;@5655c38d, mLbeIndependenceSettings=[IndependenceType=SEMANTIC, AbstractionType=NONE, UseConditional=false, UseSemiCommutativity=true, Solver=Z3, SolverTimeout=1000ms] [2023-11-21 19:03:37,840 INFO L358 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2023-11-21 19:03:37,844 INFO L276 IsEmpty]: Start isEmpty. Operand has 27 states, 15 states have (on average 1.5333333333333334) internal successors, (23), 16 states have internal predecessors, (23), 8 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (8), 8 states have call predecessors, (8), 8 states have call successors, (8) [2023-11-21 19:03:37,851 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2023-11-21 19:03:37,851 INFO L187 NwaCegarLoop]: Found error trace [2023-11-21 19:03:37,852 INFO L195 NwaCegarLoop]: trace histogram [4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-21 19:03:37,853 INFO L420 AbstractCegarLoop]: === Iteration 1 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-21 19:03:37,858 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-21 19:03:37,859 INFO L85 PathProgramCache]: Analyzing trace with hash 1333631252, now seen corresponding path program 1 times [2023-11-21 19:03:37,871 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-21 19:03:37,871 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2122743997] [2023-11-21 19:03:37,872 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-21 19:03:37,872 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-21 19:03:38,005 ERROR L246 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2023-11-21 19:03:38,006 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1322812422] [2023-11-21 19:03:38,006 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-21 19:03:38,006 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-21 19:03:38,007 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7b1d0bc3-b8b1-4128-a81a-f02e0669ee61/bin/utaipan-verify-QoSU8krkJ5/z3 [2023-11-21 19:03:38,016 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7b1d0bc3-b8b1-4128-a81a-f02e0669ee61/bin/utaipan-verify-QoSU8krkJ5/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-21 19:03:38,036 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7b1d0bc3-b8b1-4128-a81a-f02e0669ee61/bin/utaipan-verify-QoSU8krkJ5/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2023-11-21 19:03:38,156 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-21 19:03:38,159 INFO L262 TraceCheckSpWp]: Trace formula consists of 75 conjuncts, 11 conjunts are in the unsatisfiable core [2023-11-21 19:03:38,168 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-21 19:03:38,512 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2023-11-21 19:03:38,512 INFO L323 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2023-11-21 19:03:38,513 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-21 19:03:38,513 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2122743997] [2023-11-21 19:03:38,513 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2023-11-21 19:03:38,514 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1322812422] [2023-11-21 19:03:38,515 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1322812422] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-21 19:03:38,515 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-11-21 19:03:38,515 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2023-11-21 19:03:38,518 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1084699280] [2023-11-21 19:03:38,519 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-21 19:03:38,524 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2023-11-21 19:03:38,525 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-21 19:03:38,559 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2023-11-21 19:03:38,560 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2023-11-21 19:03:38,563 INFO L87 Difference]: Start difference. First operand has 27 states, 15 states have (on average 1.5333333333333334) internal successors, (23), 16 states have internal predecessors, (23), 8 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (8), 8 states have call predecessors, (8), 8 states have call successors, (8) Second operand has 5 states, 5 states have (on average 1.6) internal successors, (8), 4 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) [2023-11-21 19:03:40,572 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.86s for a HTC check with result VALID. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2023-11-21 19:03:42,554 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.94s for a HTC check with result VALID. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2023-11-21 19:03:44,572 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2023-11-21 19:03:44,596 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-21 19:03:44,596 INFO L93 Difference]: Finished difference Result 60 states and 99 transitions. [2023-11-21 19:03:44,597 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2023-11-21 19:03:44,599 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 1.6) internal successors, (8), 4 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 [2023-11-21 19:03:44,599 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-21 19:03:44,608 INFO L225 Difference]: With dead ends: 60 [2023-11-21 19:03:44,608 INFO L226 Difference]: Without dead ends: 39 [2023-11-21 19:03:44,611 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 20 GetRequests, 16 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2023-11-21 19:03:44,615 INFO L413 NwaCegarLoop]: 21 mSDtfsCounter, 11 mSDsluCounter, 61 mSDsCounter, 0 mSdLazyCounter, 57 mSolverCounterSat, 8 mSolverCounterUnsat, 1 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 5.9s Time, 0 mProtectedPredicate, 0 mProtectedAction, 15 SdHoareTripleChecker+Valid, 82 SdHoareTripleChecker+Invalid, 66 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 8 IncrementalHoareTripleChecker+Valid, 57 IncrementalHoareTripleChecker+Invalid, 1 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 6.0s IncrementalHoareTripleChecker+Time [2023-11-21 19:03:44,616 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [15 Valid, 82 Invalid, 66 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [8 Valid, 57 Invalid, 1 Unknown, 0 Unchecked, 6.0s Time] [2023-11-21 19:03:44,634 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 39 states. [2023-11-21 19:03:44,662 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 39 to 38. [2023-11-21 19:03:44,664 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 38 states, 23 states have (on average 1.3043478260869565) internal successors, (30), 24 states have internal predecessors, (30), 11 states have call successors, (11), 3 states have call predecessors, (11), 3 states have return successors, (10), 10 states have call predecessors, (10), 10 states have call successors, (10) [2023-11-21 19:03:44,666 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 38 states to 38 states and 51 transitions. [2023-11-21 19:03:44,668 INFO L78 Accepts]: Start accepts. Automaton has 38 states and 51 transitions. Word has length 20 [2023-11-21 19:03:44,668 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-21 19:03:44,669 INFO L495 AbstractCegarLoop]: Abstraction has 38 states and 51 transitions. [2023-11-21 19:03:44,669 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 1.6) internal successors, (8), 4 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) [2023-11-21 19:03:44,669 INFO L276 IsEmpty]: Start isEmpty. Operand 38 states and 51 transitions. [2023-11-21 19:03:44,671 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2023-11-21 19:03:44,671 INFO L187 NwaCegarLoop]: Found error trace [2023-11-21 19:03:44,672 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] [2023-11-21 19:03:44,692 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7b1d0bc3-b8b1-4128-a81a-f02e0669ee61/bin/utaipan-verify-QoSU8krkJ5/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Ended with exit code 0 [2023-11-21 19:03:44,880 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0,2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7b1d0bc3-b8b1-4128-a81a-f02e0669ee61/bin/utaipan-verify-QoSU8krkJ5/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-21 19:03:44,881 INFO L420 AbstractCegarLoop]: === Iteration 2 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-21 19:03:44,881 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-21 19:03:44,882 INFO L85 PathProgramCache]: Analyzing trace with hash 1820027827, now seen corresponding path program 1 times [2023-11-21 19:03:44,882 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-21 19:03:44,882 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1753107114] [2023-11-21 19:03:44,883 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-21 19:03:44,883 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-21 19:03:44,909 ERROR L246 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2023-11-21 19:03:44,910 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [548826260] [2023-11-21 19:03:44,910 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-21 19:03:44,910 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-21 19:03:44,910 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7b1d0bc3-b8b1-4128-a81a-f02e0669ee61/bin/utaipan-verify-QoSU8krkJ5/z3 [2023-11-21 19:03:44,914 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7b1d0bc3-b8b1-4128-a81a-f02e0669ee61/bin/utaipan-verify-QoSU8krkJ5/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-21 19:03:44,931 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7b1d0bc3-b8b1-4128-a81a-f02e0669ee61/bin/utaipan-verify-QoSU8krkJ5/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2023-11-21 19:03:44,987 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-21 19:03:44,988 INFO L262 TraceCheckSpWp]: Trace formula consists of 86 conjuncts, 10 conjunts are in the unsatisfiable core [2023-11-21 19:03:44,992 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-21 19:03:45,139 INFO L134 CoverageAnalysis]: Checked inductivity of 14 backedges. 1 proven. 1 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2023-11-21 19:03:45,139 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-21 19:03:45,361 INFO L134 CoverageAnalysis]: Checked inductivity of 14 backedges. 1 proven. 1 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2023-11-21 19:03:45,362 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-21 19:03:45,362 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1753107114] [2023-11-21 19:03:45,362 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2023-11-21 19:03:45,363 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [548826260] [2023-11-21 19:03:45,363 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [548826260] provided 0 perfect and 2 imperfect interpolant sequences [2023-11-21 19:03:45,363 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1363612787] [2023-11-21 19:03:45,388 INFO L159 IcfgInterpreter]: Started Sifa with 19 locations of interest [2023-11-21 19:03:45,388 INFO L166 IcfgInterpreter]: Building call graph [2023-11-21 19:03:45,392 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-11-21 19:03:45,398 INFO L176 IcfgInterpreter]: Starting interpretation [2023-11-21 19:03:45,399 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-11-21 19:03:46,484 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 63 for LOIs [2023-11-21 19:03:46,603 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 3 for LOIs [2023-11-21 19:03:46,604 INFO L180 IcfgInterpreter]: Interpretation finished [2023-11-21 19:03:49,229 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSifa [1363612787] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-21 19:03:49,229 INFO L185 FreeRefinementEngine]: Found 1 perfect and 2 imperfect interpolant sequences. [2023-11-21 19:03:49,229 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [13] imperfect sequences [8, 8] total 22 [2023-11-21 19:03:49,230 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [495430372] [2023-11-21 19:03:49,230 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-21 19:03:49,231 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 14 states [2023-11-21 19:03:49,231 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-21 19:03:49,232 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2023-11-21 19:03:49,233 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=100, Invalid=362, Unknown=0, NotChecked=0, Total=462 [2023-11-21 19:03:49,234 INFO L87 Difference]: Start difference. First operand 38 states and 51 transitions. Second operand has 14 states, 8 states have (on average 1.375) internal successors, (11), 7 states have internal predecessors, (11), 6 states have call successors, (6), 2 states have call predecessors, (6), 2 states have return successors, (5), 5 states have call predecessors, (5), 5 states have call successors, (5) [2023-11-21 19:03:51,324 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.30s for a HTC check with result INVALID. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=true, quantifiers [] [2023-11-21 19:03:54,632 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=true, quantifiers [0] [2023-11-21 19:03:57,149 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=true, quantifiers [0] [2023-11-21 19:03:59,055 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-21 19:03:59,055 INFO L93 Difference]: Finished difference Result 45 states and 57 transitions. [2023-11-21 19:03:59,056 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2023-11-21 19:03:59,057 INFO L78 Accepts]: Start accepts. Automaton has has 14 states, 8 states have (on average 1.375) internal successors, (11), 7 states have internal predecessors, (11), 6 states have call successors, (6), 2 states have call predecessors, (6), 2 states have return successors, (5), 5 states have call predecessors, (5), 5 states have call successors, (5) Word has length 26 [2023-11-21 19:03:59,057 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-21 19:03:59,058 INFO L225 Difference]: With dead ends: 45 [2023-11-21 19:03:59,058 INFO L226 Difference]: Without dead ends: 38 [2023-11-21 19:03:59,059 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 76 GetRequests, 53 SyntacticMatches, 3 SemanticMatches, 20 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 83 ImplicationChecksByTransitivity, 2.7s TimeCoverageRelationStatistics Valid=100, Invalid=362, Unknown=0, NotChecked=0, Total=462 [2023-11-21 19:03:59,060 INFO L413 NwaCegarLoop]: 15 mSDtfsCounter, 26 mSDsluCounter, 39 mSDsCounter, 0 mSdLazyCounter, 170 mSolverCounterSat, 8 mSolverCounterUnsat, 2 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 9.7s Time, 0 mProtectedPredicate, 0 mProtectedAction, 31 SdHoareTripleChecker+Valid, 54 SdHoareTripleChecker+Invalid, 180 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 8 IncrementalHoareTripleChecker+Valid, 170 IncrementalHoareTripleChecker+Invalid, 2 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 9.8s IncrementalHoareTripleChecker+Time [2023-11-21 19:03:59,061 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [31 Valid, 54 Invalid, 180 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [8 Valid, 170 Invalid, 2 Unknown, 0 Unchecked, 9.8s Time] [2023-11-21 19:03:59,062 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 38 states. [2023-11-21 19:03:59,087 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 38 to 38. [2023-11-21 19:03:59,088 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 38 states, 23 states have (on average 1.2608695652173914) internal successors, (29), 24 states have internal predecessors, (29), 11 states have call successors, (11), 3 states have call predecessors, (11), 3 states have return successors, (10), 10 states have call predecessors, (10), 10 states have call successors, (10) [2023-11-21 19:03:59,091 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 38 states to 38 states and 50 transitions. [2023-11-21 19:03:59,095 INFO L78 Accepts]: Start accepts. Automaton has 38 states and 50 transitions. Word has length 26 [2023-11-21 19:03:59,096 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-21 19:03:59,096 INFO L495 AbstractCegarLoop]: Abstraction has 38 states and 50 transitions. [2023-11-21 19:03:59,096 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 14 states, 8 states have (on average 1.375) internal successors, (11), 7 states have internal predecessors, (11), 6 states have call successors, (6), 2 states have call predecessors, (6), 2 states have return successors, (5), 5 states have call predecessors, (5), 5 states have call successors, (5) [2023-11-21 19:03:59,096 INFO L276 IsEmpty]: Start isEmpty. Operand 38 states and 50 transitions. [2023-11-21 19:03:59,097 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 35 [2023-11-21 19:03:59,097 INFO L187 NwaCegarLoop]: Found error trace [2023-11-21 19:03:59,098 INFO L195 NwaCegarLoop]: trace histogram [4, 3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-21 19:03:59,115 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7b1d0bc3-b8b1-4128-a81a-f02e0669ee61/bin/utaipan-verify-QoSU8krkJ5/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Forceful destruction successful, exit code 0 [2023-11-21 19:03:59,298 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1,3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7b1d0bc3-b8b1-4128-a81a-f02e0669ee61/bin/utaipan-verify-QoSU8krkJ5/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-21 19:03:59,299 INFO L420 AbstractCegarLoop]: === Iteration 3 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-21 19:03:59,299 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-21 19:03:59,299 INFO L85 PathProgramCache]: Analyzing trace with hash -1140063161, now seen corresponding path program 1 times [2023-11-21 19:03:59,299 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-21 19:03:59,299 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1756546686] [2023-11-21 19:03:59,299 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-21 19:03:59,300 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-21 19:03:59,314 ERROR L246 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2023-11-21 19:03:59,314 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1195115538] [2023-11-21 19:03:59,315 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-21 19:03:59,315 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-21 19:03:59,315 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7b1d0bc3-b8b1-4128-a81a-f02e0669ee61/bin/utaipan-verify-QoSU8krkJ5/z3 [2023-11-21 19:03:59,316 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7b1d0bc3-b8b1-4128-a81a-f02e0669ee61/bin/utaipan-verify-QoSU8krkJ5/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-21 19:03:59,332 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7b1d0bc3-b8b1-4128-a81a-f02e0669ee61/bin/utaipan-verify-QoSU8krkJ5/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2023-11-21 19:03:59,372 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-21 19:03:59,374 INFO L262 TraceCheckSpWp]: Trace formula consists of 101 conjuncts, 14 conjunts are in the unsatisfiable core [2023-11-21 19:03:59,376 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-21 19:03:59,758 INFO L134 CoverageAnalysis]: Checked inductivity of 22 backedges. 6 proven. 3 refuted. 0 times theorem prover too weak. 13 trivial. 0 not checked. [2023-11-21 19:03:59,758 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-21 19:03:59,978 INFO L134 CoverageAnalysis]: Checked inductivity of 22 backedges. 8 proven. 1 refuted. 0 times theorem prover too weak. 13 trivial. 0 not checked. [2023-11-21 19:03:59,978 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-21 19:03:59,978 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1756546686] [2023-11-21 19:03:59,979 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2023-11-21 19:03:59,979 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1195115538] [2023-11-21 19:03:59,979 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1195115538] provided 0 perfect and 2 imperfect interpolant sequences [2023-11-21 19:03:59,979 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [370807320] [2023-11-21 19:03:59,982 INFO L159 IcfgInterpreter]: Started Sifa with 21 locations of interest [2023-11-21 19:03:59,982 INFO L166 IcfgInterpreter]: Building call graph [2023-11-21 19:03:59,983 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-11-21 19:03:59,983 INFO L176 IcfgInterpreter]: Starting interpretation [2023-11-21 19:03:59,983 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-11-21 19:04:05,518 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 6 for LOIs [2023-11-21 19:04:05,523 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 3 for LOIs [2023-11-21 19:04:05,524 INFO L180 IcfgInterpreter]: Interpretation finished [2023-11-21 19:04:06,693 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '747#(and (= |__VERIFIER_assert_#in~cond| 0) (= __VERIFIER_assert_~cond 0))' at error location [2023-11-21 19:04:06,693 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-11-21 19:04:06,693 INFO L185 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2023-11-21 19:04:06,693 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 7] total 11 [2023-11-21 19:04:06,694 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [751235581] [2023-11-21 19:04:06,694 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2023-11-21 19:04:06,695 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 11 states [2023-11-21 19:04:06,695 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-21 19:04:06,696 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2023-11-21 19:04:06,696 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=98, Invalid=454, Unknown=0, NotChecked=0, Total=552 [2023-11-21 19:04:06,697 INFO L87 Difference]: Start difference. First operand 38 states and 50 transitions. Second operand has 11 states, 11 states have (on average 2.3636363636363638) internal successors, (26), 9 states have internal predecessors, (26), 4 states have call successors, (10), 2 states have call predecessors, (10), 2 states have return successors, (8), 4 states have call predecessors, (8), 2 states have call successors, (8) [2023-11-21 19:04:07,320 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-21 19:04:07,321 INFO L93 Difference]: Finished difference Result 64 states and 87 transitions. [2023-11-21 19:04:07,322 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2023-11-21 19:04:07,322 INFO L78 Accepts]: Start accepts. Automaton has has 11 states, 11 states have (on average 2.3636363636363638) internal successors, (26), 9 states have internal predecessors, (26), 4 states have call successors, (10), 2 states have call predecessors, (10), 2 states have return successors, (8), 4 states have call predecessors, (8), 2 states have call successors, (8) Word has length 34 [2023-11-21 19:04:07,322 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-21 19:04:07,324 INFO L225 Difference]: With dead ends: 64 [2023-11-21 19:04:07,324 INFO L226 Difference]: Without dead ends: 60 [2023-11-21 19:04:07,325 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 102 GetRequests, 75 SyntacticMatches, 3 SemanticMatches, 24 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 148 ImplicationChecksByTransitivity, 1.6s TimeCoverageRelationStatistics Valid=113, Invalid=537, Unknown=0, NotChecked=0, Total=650 [2023-11-21 19:04:07,326 INFO L413 NwaCegarLoop]: 26 mSDtfsCounter, 39 mSDsluCounter, 126 mSDsCounter, 0 mSdLazyCounter, 144 mSolverCounterSat, 19 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 46 SdHoareTripleChecker+Valid, 152 SdHoareTripleChecker+Invalid, 163 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 19 IncrementalHoareTripleChecker+Valid, 144 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2023-11-21 19:04:07,326 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [46 Valid, 152 Invalid, 163 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [19 Valid, 144 Invalid, 0 Unknown, 0 Unchecked, 0.5s Time] [2023-11-21 19:04:07,327 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 60 states. [2023-11-21 19:04:07,362 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 60 to 40. [2023-11-21 19:04:07,362 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 40 states, 25 states have (on average 1.2) internal successors, (30), 25 states have internal predecessors, (30), 11 states have call successors, (11), 4 states have call predecessors, (11), 3 states have return successors, (10), 10 states have call predecessors, (10), 10 states have call successors, (10) [2023-11-21 19:04:07,364 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 40 states to 40 states and 51 transitions. [2023-11-21 19:04:07,364 INFO L78 Accepts]: Start accepts. Automaton has 40 states and 51 transitions. Word has length 34 [2023-11-21 19:04:07,365 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-21 19:04:07,365 INFO L495 AbstractCegarLoop]: Abstraction has 40 states and 51 transitions. [2023-11-21 19:04:07,366 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 11 states, 11 states have (on average 2.3636363636363638) internal successors, (26), 9 states have internal predecessors, (26), 4 states have call successors, (10), 2 states have call predecessors, (10), 2 states have return successors, (8), 4 states have call predecessors, (8), 2 states have call successors, (8) [2023-11-21 19:04:07,366 INFO L276 IsEmpty]: Start isEmpty. Operand 40 states and 51 transitions. [2023-11-21 19:04:07,370 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 55 [2023-11-21 19:04:07,371 INFO L187 NwaCegarLoop]: Found error trace [2023-11-21 19:04:07,371 INFO L195 NwaCegarLoop]: trace histogram [6, 5, 5, 4, 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, 1, 1] [2023-11-21 19:04:07,401 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7b1d0bc3-b8b1-4128-a81a-f02e0669ee61/bin/utaipan-verify-QoSU8krkJ5/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Forceful destruction successful, exit code 0 [2023-11-21 19:04:07,592 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2,4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7b1d0bc3-b8b1-4128-a81a-f02e0669ee61/bin/utaipan-verify-QoSU8krkJ5/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-21 19:04:07,592 INFO L420 AbstractCegarLoop]: === Iteration 4 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-21 19:04:07,592 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-21 19:04:07,592 INFO L85 PathProgramCache]: Analyzing trace with hash -224296803, now seen corresponding path program 1 times [2023-11-21 19:04:07,593 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-21 19:04:07,593 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1667692763] [2023-11-21 19:04:07,593 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-21 19:04:07,593 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-21 19:04:07,620 ERROR L246 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2023-11-21 19:04:07,632 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [518782172] [2023-11-21 19:04:07,632 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-21 19:04:07,633 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-21 19:04:07,633 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7b1d0bc3-b8b1-4128-a81a-f02e0669ee61/bin/utaipan-verify-QoSU8krkJ5/z3 [2023-11-21 19:04:07,646 INFO L229 MonitoredProcess]: Starting monitored process 5 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7b1d0bc3-b8b1-4128-a81a-f02e0669ee61/bin/utaipan-verify-QoSU8krkJ5/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-21 19:04:07,668 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7b1d0bc3-b8b1-4128-a81a-f02e0669ee61/bin/utaipan-verify-QoSU8krkJ5/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2023-11-21 19:04:07,708 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-21 19:04:07,709 INFO L262 TraceCheckSpWp]: Trace formula consists of 134 conjuncts, 10 conjunts are in the unsatisfiable core [2023-11-21 19:04:07,712 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-21 19:04:07,816 INFO L134 CoverageAnalysis]: Checked inductivity of 68 backedges. 24 proven. 1 refuted. 0 times theorem prover too weak. 43 trivial. 0 not checked. [2023-11-21 19:04:07,817 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-21 19:04:10,024 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-21 19:04:10,025 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1667692763] [2023-11-21 19:04:10,025 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2023-11-21 19:04:10,025 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [518782172] [2023-11-21 19:04:10,025 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [518782172] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-21 19:04:10,025 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [913586749] [2023-11-21 19:04:10,028 INFO L159 IcfgInterpreter]: Started Sifa with 25 locations of interest [2023-11-21 19:04:10,028 INFO L166 IcfgInterpreter]: Building call graph [2023-11-21 19:04:10,029 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-11-21 19:04:10,029 INFO L176 IcfgInterpreter]: Starting interpretation [2023-11-21 19:04:10,029 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-11-21 19:04:16,916 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 1 for LOIs [2023-11-21 19:04:16,920 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 3 for LOIs [2023-11-21 19:04:16,922 INFO L180 IcfgInterpreter]: Interpretation finished [2023-11-21 19:04:24,133 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '1112#(and (= |__VERIFIER_assert_#in~cond| 0) (= __VERIFIER_assert_~cond 0))' at error location [2023-11-21 19:04:24,134 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-11-21 19:04:24,134 INFO L185 FreeRefinementEngine]: Found 0 perfect and 1 imperfect interpolant sequences. [2023-11-21 19:04:24,134 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9] total 9 [2023-11-21 19:04:24,134 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [341468962] [2023-11-21 19:04:24,135 INFO L85 oduleStraightlineAll]: Using 1 imperfect interpolants to construct interpolant automaton [2023-11-21 19:04:24,135 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 9 states [2023-11-21 19:04:24,135 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-21 19:04:24,136 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2023-11-21 19:04:24,137 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=98, Invalid=656, Unknown=2, NotChecked=0, Total=756 [2023-11-21 19:04:24,137 INFO L87 Difference]: Start difference. First operand 40 states and 51 transitions. Second operand has 9 states, 8 states have (on average 2.75) internal successors, (22), 7 states have internal predecessors, (22), 3 states have call successors, (9), 2 states have call predecessors, (9), 2 states have return successors, (8), 2 states have call predecessors, (8), 2 states have call successors, (8) [2023-11-21 19:04:24,394 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-21 19:04:24,394 INFO L93 Difference]: Finished difference Result 98 states and 128 transitions. [2023-11-21 19:04:24,394 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2023-11-21 19:04:24,395 INFO L78 Accepts]: Start accepts. Automaton has has 9 states, 8 states have (on average 2.75) internal successors, (22), 7 states have internal predecessors, (22), 3 states have call successors, (9), 2 states have call predecessors, (9), 2 states have return successors, (8), 2 states have call predecessors, (8), 2 states have call successors, (8) Word has length 54 [2023-11-21 19:04:24,395 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-21 19:04:24,395 INFO L225 Difference]: With dead ends: 98 [2023-11-21 19:04:24,395 INFO L226 Difference]: Without dead ends: 0 [2023-11-21 19:04:24,397 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 117 GetRequests, 86 SyntacticMatches, 3 SemanticMatches, 28 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 214 ImplicationChecksByTransitivity, 9.4s TimeCoverageRelationStatistics Valid=116, Invalid=752, Unknown=2, NotChecked=0, Total=870 [2023-11-21 19:04:24,400 INFO L413 NwaCegarLoop]: 33 mSDtfsCounter, 22 mSDsluCounter, 150 mSDsCounter, 0 mSdLazyCounter, 129 mSolverCounterSat, 11 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 23 SdHoareTripleChecker+Valid, 183 SdHoareTripleChecker+Invalid, 140 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 11 IncrementalHoareTripleChecker+Valid, 129 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2023-11-21 19:04:24,401 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [23 Valid, 183 Invalid, 140 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [11 Valid, 129 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2023-11-21 19:04:24,402 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 0 states. [2023-11-21 19:04:24,402 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 0 to 0. [2023-11-21 19:04:24,402 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 0 states, 0 states have (on average 0.0) internal successors, (0), 0 states have internal predecessors, (0), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-21 19:04:24,402 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 0 states to 0 states and 0 transitions. [2023-11-21 19:04:24,402 INFO L78 Accepts]: Start accepts. Automaton has 0 states and 0 transitions. Word has length 54 [2023-11-21 19:04:24,403 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-21 19:04:24,403 INFO L495 AbstractCegarLoop]: Abstraction has 0 states and 0 transitions. [2023-11-21 19:04:24,403 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 9 states, 8 states have (on average 2.75) internal successors, (22), 7 states have internal predecessors, (22), 3 states have call successors, (9), 2 states have call predecessors, (9), 2 states have return successors, (8), 2 states have call predecessors, (8), 2 states have call successors, (8) [2023-11-21 19:04:24,403 INFO L276 IsEmpty]: Start isEmpty. Operand 0 states and 0 transitions. [2023-11-21 19:04:24,403 INFO L282 IsEmpty]: Finished isEmpty. No accepting run. [2023-11-21 19:04:24,406 INFO L805 garLoopResultBuilder]: Registering result SAFE for location __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION (0 of 1 remaining) [2023-11-21 19:04:24,428 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7b1d0bc3-b8b1-4128-a81a-f02e0669ee61/bin/utaipan-verify-QoSU8krkJ5/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Forceful destruction successful, exit code 0 [2023-11-21 19:04:24,607 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3,5 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7b1d0bc3-b8b1-4128-a81a-f02e0669ee61/bin/utaipan-verify-QoSU8krkJ5/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-21 19:04:24,609 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends 0 states and 0 transitions.