./Ultimate.py --spec ../../sv-benchmarks/c/properties/unreach-call.prp --file ../../sv-benchmarks/c/nla-digbench-scaling/egcd3-ll_unwindbound20.c --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for ERROR reachability Using default analysis Version 0e0057cc Calling Ultimate with: /usr/lib/jvm/java-11-openjdk-amd64/bin/java -Dosgi.configuration.area=/tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9baea50c-125b-415c-97d3-07da8d4dc433/bin/utaipan-verify-nQ1chXbOIh/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9baea50c-125b-415c-97d3-07da8d4dc433/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_9baea50c-125b-415c-97d3-07da8d4dc433/bin/utaipan-verify-nQ1chXbOIh/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9baea50c-125b-415c-97d3-07da8d4dc433/bin/utaipan-verify-nQ1chXbOIh/config/TaipanReach.xml -i ../../sv-benchmarks/c/nla-digbench-scaling/egcd3-ll_unwindbound20.c -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9baea50c-125b-415c-97d3-07da8d4dc433/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_9baea50c-125b-415c-97d3-07da8d4dc433/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 7004d2b01bb7d5c4b1956f589017b61646e33c2f2be997467596b458e0de6322 --- Real Ultimate output --- This is Ultimate 0.2.4-dev-0e0057c [2023-12-02 17:44:32,335 INFO L188 SettingsManager]: Resetting all preferences to default values... [2023-12-02 17:44:32,401 INFO L114 SettingsManager]: Loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9baea50c-125b-415c-97d3-07da8d4dc433/bin/utaipan-verify-nQ1chXbOIh/config/svcomp-Reach-32bit-Taipan_Default.epf [2023-12-02 17:44:32,406 WARN L101 SettingsManager]: Preference file contains the following unknown settings: [2023-12-02 17:44:32,406 WARN L103 SettingsManager]: * de.uni_freiburg.informatik.ultimate.core.Log level for class [2023-12-02 17:44:32,431 INFO L130 SettingsManager]: Preferences different from defaults after loading the file: [2023-12-02 17:44:32,431 INFO L151 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2023-12-02 17:44:32,432 INFO L153 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2023-12-02 17:44:32,433 INFO L151 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2023-12-02 17:44:32,433 INFO L153 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2023-12-02 17:44:32,434 INFO L153 SettingsManager]: * User list type=DISABLED [2023-12-02 17:44:32,434 INFO L151 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2023-12-02 17:44:32,435 INFO L153 SettingsManager]: * Explicit value domain=true [2023-12-02 17:44:32,435 INFO L153 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2023-12-02 17:44:32,436 INFO L153 SettingsManager]: * Octagon Domain=false [2023-12-02 17:44:32,436 INFO L153 SettingsManager]: * Abstract domain=CompoundDomain [2023-12-02 17:44:32,437 INFO L153 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2023-12-02 17:44:32,437 INFO L153 SettingsManager]: * Use the RCFG-of-the-future interface=true [2023-12-02 17:44:32,438 INFO L153 SettingsManager]: * Interval Domain=false [2023-12-02 17:44:32,438 INFO L151 SettingsManager]: Preferences of Sifa differ from their defaults: [2023-12-02 17:44:32,439 INFO L153 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2023-12-02 17:44:32,440 INFO L153 SettingsManager]: * Simplification Technique=POLY_PAC [2023-12-02 17:44:32,440 INFO L151 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2023-12-02 17:44:32,441 INFO L153 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2023-12-02 17:44:32,441 INFO L153 SettingsManager]: * sizeof long=4 [2023-12-02 17:44:32,442 INFO L153 SettingsManager]: * Overapproximate operations on floating types=true [2023-12-02 17:44:32,442 INFO L153 SettingsManager]: * sizeof POINTER=4 [2023-12-02 17:44:32,442 INFO L153 SettingsManager]: * Check division by zero=IGNORE [2023-12-02 17:44:32,443 INFO L153 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2023-12-02 17:44:32,443 INFO L153 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2023-12-02 17:44:32,444 INFO L153 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2023-12-02 17:44:32,444 INFO L153 SettingsManager]: * sizeof long double=12 [2023-12-02 17:44:32,444 INFO L153 SettingsManager]: * Check if freed pointer was valid=false [2023-12-02 17:44:32,445 INFO L153 SettingsManager]: * Use constant arrays=true [2023-12-02 17:44:32,445 INFO L151 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2023-12-02 17:44:32,445 INFO L153 SettingsManager]: * Only consider context switches at boundaries of atomic blocks=true [2023-12-02 17:44:32,445 INFO L153 SettingsManager]: * SMT solver=External_DefaultMode [2023-12-02 17:44:32,445 INFO L153 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2023-12-02 17:44:32,446 INFO L151 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2023-12-02 17:44:32,446 INFO L153 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2023-12-02 17:44:32,446 INFO L153 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopHeads [2023-12-02 17:44:32,446 INFO L153 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2023-12-02 17:44:32,447 INFO L153 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2023-12-02 17:44:32,447 INFO L153 SettingsManager]: * Apply one-shot large block encoding in concurrent analysis=false [2023-12-02 17:44:32,447 INFO L153 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2023-12-02 17:44:32,447 INFO L153 SettingsManager]: * Trace refinement exception blacklist=NONE [2023-12-02 17:44:32,447 INFO L153 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2023-12-02 17:44:32,447 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_9baea50c-125b-415c-97d3-07da8d4dc433/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9baea50c-125b-415c-97d3-07da8d4dc433/bin/utaipan-verify-nQ1chXbOIh Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> 7004d2b01bb7d5c4b1956f589017b61646e33c2f2be997467596b458e0de6322 [2023-12-02 17:44:32,657 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2023-12-02 17:44:32,678 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2023-12-02 17:44:32,681 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2023-12-02 17:44:32,682 INFO L270 PluginConnector]: Initializing CDTParser... [2023-12-02 17:44:32,683 INFO L274 PluginConnector]: CDTParser initialized [2023-12-02 17:44:32,684 INFO L431 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9baea50c-125b-415c-97d3-07da8d4dc433/bin/utaipan-verify-nQ1chXbOIh/../../sv-benchmarks/c/nla-digbench-scaling/egcd3-ll_unwindbound20.c [2023-12-02 17:44:35,491 INFO L533 CDTParser]: Created temporary CDT project at NULL [2023-12-02 17:44:35,657 INFO L384 CDTParser]: Found 1 translation units. [2023-12-02 17:44:35,657 INFO L180 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9baea50c-125b-415c-97d3-07da8d4dc433/sv-benchmarks/c/nla-digbench-scaling/egcd3-ll_unwindbound20.c [2023-12-02 17:44:35,665 INFO L427 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9baea50c-125b-415c-97d3-07da8d4dc433/bin/utaipan-verify-nQ1chXbOIh/data/06170d65b/49a2999b459b4adfa136944fce2e3dbf/FLAG18f006133 [2023-12-02 17:44:35,678 INFO L435 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9baea50c-125b-415c-97d3-07da8d4dc433/bin/utaipan-verify-nQ1chXbOIh/data/06170d65b/49a2999b459b4adfa136944fce2e3dbf [2023-12-02 17:44:35,681 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2023-12-02 17:44:35,682 INFO L133 ToolchainWalker]: Walking toolchain with 6 elements. [2023-12-02 17:44:35,684 INFO L112 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2023-12-02 17:44:35,684 INFO L270 PluginConnector]: Initializing CACSL2BoogieTranslator... [2023-12-02 17:44:35,688 INFO L274 PluginConnector]: CACSL2BoogieTranslator initialized [2023-12-02 17:44:35,689 INFO L184 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 02.12 05:44:35" (1/1) ... [2023-12-02 17:44:35,690 INFO L204 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@431ba82e and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 05:44:35, skipping insertion in model container [2023-12-02 17:44:35,691 INFO L184 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 02.12 05:44:35" (1/1) ... [2023-12-02 17:44:35,711 INFO L177 MainTranslator]: Built tables and reachable declarations [2023-12-02 17:44:35,847 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_9baea50c-125b-415c-97d3-07da8d4dc433/sv-benchmarks/c/nla-digbench-scaling/egcd3-ll_unwindbound20.c[490,503] [2023-12-02 17:44:35,868 INFO L209 PostProcessor]: Analyzing one entry point: main [2023-12-02 17:44:35,879 INFO L202 MainTranslator]: Completed pre-run [2023-12-02 17:44:35,889 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_9baea50c-125b-415c-97d3-07da8d4dc433/sv-benchmarks/c/nla-digbench-scaling/egcd3-ll_unwindbound20.c[490,503] [2023-12-02 17:44:35,899 INFO L209 PostProcessor]: Analyzing one entry point: main [2023-12-02 17:44:35,912 INFO L206 MainTranslator]: Completed translation [2023-12-02 17:44:35,912 INFO L201 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 05:44:35 WrapperNode [2023-12-02 17:44:35,912 INFO L131 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2023-12-02 17:44:35,913 INFO L112 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2023-12-02 17:44:35,913 INFO L270 PluginConnector]: Initializing Boogie Procedure Inliner... [2023-12-02 17:44:35,913 INFO L274 PluginConnector]: Boogie Procedure Inliner initialized [2023-12-02 17:44:35,919 INFO L184 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 05:44:35" (1/1) ... [2023-12-02 17:44:35,924 INFO L184 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 05:44:35" (1/1) ... [2023-12-02 17:44:35,942 INFO L138 Inliner]: procedures = 14, calls = 14, calls flagged for inlining = 2, calls inlined = 2, statements flattened = 94 [2023-12-02 17:44:35,942 INFO L131 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2023-12-02 17:44:35,943 INFO L112 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2023-12-02 17:44:35,943 INFO L270 PluginConnector]: Initializing Boogie Preprocessor... [2023-12-02 17:44:35,943 INFO L274 PluginConnector]: Boogie Preprocessor initialized [2023-12-02 17:44:35,949 INFO L184 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 05:44:35" (1/1) ... [2023-12-02 17:44:35,950 INFO L184 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 05:44:35" (1/1) ... [2023-12-02 17:44:35,951 INFO L184 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 05:44:35" (1/1) ... [2023-12-02 17:44:35,952 INFO L184 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 05:44:35" (1/1) ... [2023-12-02 17:44:35,956 INFO L184 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 05:44:35" (1/1) ... [2023-12-02 17:44:35,961 INFO L184 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 05:44:35" (1/1) ... [2023-12-02 17:44:35,962 INFO L184 PluginConnector]: Executing the observer LTLStepAnnotator from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 05:44:35" (1/1) ... [2023-12-02 17:44:35,963 INFO L184 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 05:44:35" (1/1) ... [2023-12-02 17:44:35,965 INFO L131 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2023-12-02 17:44:35,966 INFO L112 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2023-12-02 17:44:35,967 INFO L270 PluginConnector]: Initializing RCFGBuilder... [2023-12-02 17:44:35,967 INFO L274 PluginConnector]: RCFGBuilder initialized [2023-12-02 17:44:35,968 INFO L184 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 05:44:35" (1/1) ... [2023-12-02 17:44:35,974 INFO L173 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2023-12-02 17:44:35,983 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9baea50c-125b-415c-97d3-07da8d4dc433/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 17:44:35,994 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9baea50c-125b-415c-97d3-07da8d4dc433/bin/utaipan-verify-nQ1chXbOIh/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2023-12-02 17:44:35,998 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9baea50c-125b-415c-97d3-07da8d4dc433/bin/utaipan-verify-nQ1chXbOIh/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2023-12-02 17:44:36,027 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2023-12-02 17:44:36,028 INFO L130 BoogieDeclarations]: Found specification of procedure assume_abort_if_not [2023-12-02 17:44:36,028 INFO L138 BoogieDeclarations]: Found implementation of procedure assume_abort_if_not [2023-12-02 17:44:36,028 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2023-12-02 17:44:36,028 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2023-12-02 17:44:36,028 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2023-12-02 17:44:36,028 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2023-12-02 17:44:36,029 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2023-12-02 17:44:36,094 INFO L241 CfgBuilder]: Building ICFG [2023-12-02 17:44:36,096 INFO L267 CfgBuilder]: Building CFG for each procedure with an implementation [2023-12-02 17:44:36,272 INFO L282 CfgBuilder]: Performing block encoding [2023-12-02 17:44:36,302 INFO L304 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2023-12-02 17:44:36,302 INFO L309 CfgBuilder]: Removed 3 assume(true) statements. [2023-12-02 17:44:36,304 INFO L201 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 02.12 05:44:36 BoogieIcfgContainer [2023-12-02 17:44:36,304 INFO L131 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2023-12-02 17:44:36,307 INFO L112 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2023-12-02 17:44:36,307 INFO L270 PluginConnector]: Initializing TraceAbstraction... [2023-12-02 17:44:36,311 INFO L274 PluginConnector]: TraceAbstraction initialized [2023-12-02 17:44:36,311 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 02.12 05:44:35" (1/3) ... [2023-12-02 17:44:36,312 INFO L204 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@293a4abd and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 02.12 05:44:36, skipping insertion in model container [2023-12-02 17:44:36,312 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 05:44:35" (2/3) ... [2023-12-02 17:44:36,312 INFO L204 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@293a4abd and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 02.12 05:44:36, skipping insertion in model container [2023-12-02 17:44:36,313 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 02.12 05:44:36" (3/3) ... [2023-12-02 17:44:36,314 INFO L112 eAbstractionObserver]: Analyzing ICFG egcd3-ll_unwindbound20.c [2023-12-02 17:44:36,331 INFO L203 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2023-12-02 17:44:36,332 INFO L162 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2023-12-02 17:44:36,373 INFO L356 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2023-12-02 17:44:36,378 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;@2412107d, mLbeIndependenceSettings=[IndependenceType=SEMANTIC, AbstractionType=NONE, UseConditional=false, UseSemiCommutativity=true, Solver=Z3, SolverTimeout=1000ms] [2023-12-02 17:44:36,379 INFO L358 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2023-12-02 17:44:36,382 INFO L276 IsEmpty]: Start isEmpty. Operand has 30 states, 19 states have (on average 1.5789473684210527) internal successors, (30), 20 states have internal predecessors, (30), 7 states have call successors, (7), 2 states have call predecessors, (7), 2 states have return successors, (7), 7 states have call predecessors, (7), 7 states have call successors, (7) [2023-12-02 17:44:36,388 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2023-12-02 17:44:36,388 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 17:44:36,388 INFO L195 NwaCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-12-02 17:44:36,389 INFO L420 AbstractCegarLoop]: === Iteration 1 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 17:44:36,393 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 17:44:36,393 INFO L85 PathProgramCache]: Analyzing trace with hash 1826888722, now seen corresponding path program 1 times [2023-12-02 17:44:36,400 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 17:44:36,400 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [438633204] [2023-12-02 17:44:36,400 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 17:44:36,401 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 17:44:36,502 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 17:44:36,530 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 17:44:36,530 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [438633204] [2023-12-02 17:44:36,531 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unsupported non-linear arithmetic [2023-12-02 17:44:36,532 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1711057979] [2023-12-02 17:44:36,532 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 17:44:36,532 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 17:44:36,532 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9baea50c-125b-415c-97d3-07da8d4dc433/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 17:44:36,536 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9baea50c-125b-415c-97d3-07da8d4dc433/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 17:44:36,537 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9baea50c-125b-415c-97d3-07da8d4dc433/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2023-12-02 17:44:36,602 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 17:44:36,604 INFO L262 TraceCheckSpWp]: Trace formula consists of 65 conjuncts, 1 conjunts are in the unsatisfiable core [2023-12-02 17:44:36,609 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 17:44:36,631 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2023-12-02 17:44:36,631 INFO L323 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2023-12-02 17:44:36,632 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1711057979] provided 1 perfect and 0 imperfect interpolant sequences [2023-12-02 17:44:36,632 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-12-02 17:44:36,633 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2023-12-02 17:44:36,635 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [845573611] [2023-12-02 17:44:36,635 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-12-02 17:44:36,639 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 2 states [2023-12-02 17:44:36,640 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 17:44:36,668 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 2 interpolants. [2023-12-02 17:44:36,668 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2023-12-02 17:44:36,671 INFO L87 Difference]: Start difference. First operand has 30 states, 19 states have (on average 1.5789473684210527) internal successors, (30), 20 states have internal predecessors, (30), 7 states have call successors, (7), 2 states have call predecessors, (7), 2 states have return successors, (7), 7 states have call predecessors, (7), 7 states have call successors, (7) Second operand has 2 states, 2 states have (on average 3.5) internal successors, (7), 2 states have internal predecessors, (7), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) [2023-12-02 17:44:36,700 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 17:44:36,700 INFO L93 Difference]: Finished difference Result 54 states and 86 transitions. [2023-12-02 17:44:36,701 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2023-12-02 17:44:36,702 INFO L78 Accepts]: Start accepts. Automaton has has 2 states, 2 states have (on average 3.5) internal successors, (7), 2 states have internal predecessors, (7), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) Word has length 13 [2023-12-02 17:44:36,703 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 17:44:36,710 INFO L225 Difference]: With dead ends: 54 [2023-12-02 17:44:36,710 INFO L226 Difference]: Without dead ends: 28 [2023-12-02 17:44:36,713 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 12 GetRequests, 12 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 17:44:36,717 INFO L413 NwaCegarLoop]: 37 mSDtfsCounter, 0 mSDsluCounter, 0 mSDsCounter, 0 mSdLazyCounter, 3 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 37 SdHoareTripleChecker+Invalid, 3 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 3 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2023-12-02 17:44:36,720 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [0 Valid, 37 Invalid, 3 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 3 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2023-12-02 17:44:36,733 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 28 states. [2023-12-02 17:44:36,747 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 28 to 28. [2023-12-02 17:44:36,748 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 28 states, 18 states have (on average 1.3888888888888888) internal successors, (25), 19 states have internal predecessors, (25), 7 states have call successors, (7), 2 states have call predecessors, (7), 2 states have return successors, (6), 6 states have call predecessors, (6), 6 states have call successors, (6) [2023-12-02 17:44:36,749 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 28 states to 28 states and 38 transitions. [2023-12-02 17:44:36,751 INFO L78 Accepts]: Start accepts. Automaton has 28 states and 38 transitions. Word has length 13 [2023-12-02 17:44:36,752 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 17:44:36,752 INFO L495 AbstractCegarLoop]: Abstraction has 28 states and 38 transitions. [2023-12-02 17:44:36,753 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 2 states, 2 states have (on average 3.5) internal successors, (7), 2 states have internal predecessors, (7), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) [2023-12-02 17:44:36,753 INFO L276 IsEmpty]: Start isEmpty. Operand 28 states and 38 transitions. [2023-12-02 17:44:36,754 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2023-12-02 17:44:36,754 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 17:44:36,754 INFO L195 NwaCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-12-02 17:44:36,760 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9baea50c-125b-415c-97d3-07da8d4dc433/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0 [2023-12-02 17:44:36,955 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9baea50c-125b-415c-97d3-07da8d4dc433/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable0 [2023-12-02 17:44:36,955 INFO L420 AbstractCegarLoop]: === Iteration 2 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 17:44:36,956 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 17:44:36,956 INFO L85 PathProgramCache]: Analyzing trace with hash -828509657, now seen corresponding path program 1 times [2023-12-02 17:44:36,956 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 17:44:36,957 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [386500114] [2023-12-02 17:44:36,957 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 17:44:36,957 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 17:44:36,979 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 17:44:36,996 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 17:44:36,996 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [386500114] [2023-12-02 17:44:36,996 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unsupported non-linear arithmetic [2023-12-02 17:44:36,997 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1742488275] [2023-12-02 17:44:36,997 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 17:44:36,997 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 17:44:36,997 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9baea50c-125b-415c-97d3-07da8d4dc433/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 17:44:36,998 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9baea50c-125b-415c-97d3-07da8d4dc433/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 17:44:37,001 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9baea50c-125b-415c-97d3-07da8d4dc433/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2023-12-02 17:44:37,058 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 17:44:37,059 INFO L262 TraceCheckSpWp]: Trace formula consists of 69 conjuncts, 3 conjunts are in the unsatisfiable core [2023-12-02 17:44:37,061 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 17:44:37,119 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2023-12-02 17:44:37,119 INFO L323 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2023-12-02 17:44:37,120 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1742488275] provided 1 perfect and 0 imperfect interpolant sequences [2023-12-02 17:44:37,120 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-12-02 17:44:37,120 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2023-12-02 17:44:37,121 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [621970504] [2023-12-02 17:44:37,121 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-12-02 17:44:37,122 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2023-12-02 17:44:37,122 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 17:44:37,123 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2023-12-02 17:44:37,123 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2023-12-02 17:44:37,123 INFO L87 Difference]: Start difference. First operand 28 states and 38 transitions. Second operand has 4 states, 4 states have (on average 2.0) internal successors, (8), 3 states have internal predecessors, (8), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) [2023-12-02 17:44:37,147 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 17:44:37,147 INFO L93 Difference]: Finished difference Result 37 states and 47 transitions. [2023-12-02 17:44:37,148 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2023-12-02 17:44:37,148 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 2.0) internal successors, (8), 3 states have internal predecessors, (8), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) Word has length 14 [2023-12-02 17:44:37,148 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 17:44:37,149 INFO L225 Difference]: With dead ends: 37 [2023-12-02 17:44:37,149 INFO L226 Difference]: Without dead ends: 30 [2023-12-02 17:44:37,150 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 13 GetRequests, 11 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2023-12-02 17:44:37,151 INFO L413 NwaCegarLoop]: 34 mSDtfsCounter, 0 mSDsluCounter, 60 mSDsCounter, 0 mSdLazyCounter, 13 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 94 SdHoareTripleChecker+Invalid, 13 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 13 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2023-12-02 17:44:37,152 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [0 Valid, 94 Invalid, 13 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 13 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2023-12-02 17:44:37,153 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 30 states. [2023-12-02 17:44:37,159 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 30 to 30. [2023-12-02 17:44:37,159 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 30 states, 20 states have (on average 1.35) internal successors, (27), 21 states have internal predecessors, (27), 7 states have call successors, (7), 2 states have call predecessors, (7), 2 states have return successors, (6), 6 states have call predecessors, (6), 6 states have call successors, (6) [2023-12-02 17:44:37,160 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 30 states to 30 states and 40 transitions. [2023-12-02 17:44:37,160 INFO L78 Accepts]: Start accepts. Automaton has 30 states and 40 transitions. Word has length 14 [2023-12-02 17:44:37,161 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 17:44:37,161 INFO L495 AbstractCegarLoop]: Abstraction has 30 states and 40 transitions. [2023-12-02 17:44:37,161 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 2.0) internal successors, (8), 3 states have internal predecessors, (8), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) [2023-12-02 17:44:37,161 INFO L276 IsEmpty]: Start isEmpty. Operand 30 states and 40 transitions. [2023-12-02 17:44:37,162 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2023-12-02 17:44:37,162 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 17:44:37,162 INFO L195 NwaCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-12-02 17:44:37,167 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9baea50c-125b-415c-97d3-07da8d4dc433/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Ended with exit code 0 [2023-12-02 17:44:37,363 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1,3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9baea50c-125b-415c-97d3-07da8d4dc433/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 17:44:37,363 INFO L420 AbstractCegarLoop]: === Iteration 3 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 17:44:37,364 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 17:44:37,364 INFO L85 PathProgramCache]: Analyzing trace with hash 66369279, now seen corresponding path program 1 times [2023-12-02 17:44:37,364 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 17:44:37,364 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1126750150] [2023-12-02 17:44:37,364 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 17:44:37,364 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 17:44:37,380 ERROR L246 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2023-12-02 17:44:37,381 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1650168900] [2023-12-02 17:44:37,381 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 17:44:37,381 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 17:44:37,381 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9baea50c-125b-415c-97d3-07da8d4dc433/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 17:44:37,382 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9baea50c-125b-415c-97d3-07da8d4dc433/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 17:44:37,383 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9baea50c-125b-415c-97d3-07da8d4dc433/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2023-12-02 17:44:37,434 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 17:44:37,435 INFO L262 TraceCheckSpWp]: Trace formula consists of 71 conjuncts, 7 conjunts are in the unsatisfiable core [2023-12-02 17:44:37,437 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 17:44:37,469 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 1 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2023-12-02 17:44:37,469 INFO L323 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2023-12-02 17:44:37,469 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 17:44:37,469 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1126750150] [2023-12-02 17:44:37,469 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2023-12-02 17:44:37,469 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1650168900] [2023-12-02 17:44:37,470 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1650168900] provided 1 perfect and 0 imperfect interpolant sequences [2023-12-02 17:44:37,470 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-12-02 17:44:37,470 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2023-12-02 17:44:37,470 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [635501349] [2023-12-02 17:44:37,470 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-12-02 17:44:37,471 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2023-12-02 17:44:37,471 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 17:44:37,471 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2023-12-02 17:44:37,472 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2023-12-02 17:44:37,472 INFO L87 Difference]: Start difference. First operand 30 states and 40 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, (3), 2 states have call predecessors, (3), 2 states have return successors, (2), 2 states have call predecessors, (2), 1 states have call successors, (2) [2023-12-02 17:44:37,538 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 17:44:37,538 INFO L93 Difference]: Finished difference Result 50 states and 68 transitions. [2023-12-02 17:44:37,539 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2023-12-02 17:44:37,539 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, (3), 2 states have call predecessors, (3), 2 states have return successors, (2), 2 states have call predecessors, (2), 1 states have call successors, (2) Word has length 15 [2023-12-02 17:44:37,539 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 17:44:37,540 INFO L225 Difference]: With dead ends: 50 [2023-12-02 17:44:37,541 INFO L226 Difference]: Without dead ends: 43 [2023-12-02 17:44:37,541 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 15 GetRequests, 11 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 17:44:37,543 INFO L413 NwaCegarLoop]: 29 mSDtfsCounter, 45 mSDsluCounter, 67 mSDsCounter, 0 mSdLazyCounter, 31 mSolverCounterSat, 8 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 49 SdHoareTripleChecker+Valid, 96 SdHoareTripleChecker+Invalid, 39 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 8 IncrementalHoareTripleChecker+Valid, 31 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2023-12-02 17:44:37,543 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [49 Valid, 96 Invalid, 39 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [8 Valid, 31 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2023-12-02 17:44:37,544 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 43 states. [2023-12-02 17:44:37,551 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 43 to 31. [2023-12-02 17:44:37,552 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 31 states, 21 states have (on average 1.3333333333333333) internal successors, (28), 22 states have internal predecessors, (28), 7 states have call successors, (7), 2 states have call predecessors, (7), 2 states have return successors, (6), 6 states have call predecessors, (6), 6 states have call successors, (6) [2023-12-02 17:44:37,553 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 31 states to 31 states and 41 transitions. [2023-12-02 17:44:37,553 INFO L78 Accepts]: Start accepts. Automaton has 31 states and 41 transitions. Word has length 15 [2023-12-02 17:44:37,553 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 17:44:37,554 INFO L495 AbstractCegarLoop]: Abstraction has 31 states and 41 transitions. [2023-12-02 17:44:37,554 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, (3), 2 states have call predecessors, (3), 2 states have return successors, (2), 2 states have call predecessors, (2), 1 states have call successors, (2) [2023-12-02 17:44:37,554 INFO L276 IsEmpty]: Start isEmpty. Operand 31 states and 41 transitions. [2023-12-02 17:44:37,555 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2023-12-02 17:44:37,555 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 17:44:37,555 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-12-02 17:44:37,561 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9baea50c-125b-415c-97d3-07da8d4dc433/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Ended with exit code 0 [2023-12-02 17:44:37,760 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2,4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9baea50c-125b-415c-97d3-07da8d4dc433/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 17:44:37,761 INFO L420 AbstractCegarLoop]: === Iteration 4 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 17:44:37,761 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 17:44:37,761 INFO L85 PathProgramCache]: Analyzing trace with hash -1737104877, now seen corresponding path program 1 times [2023-12-02 17:44:37,762 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 17:44:37,762 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1065903235] [2023-12-02 17:44:37,762 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 17:44:37,762 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 17:44:37,785 ERROR L246 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2023-12-02 17:44:37,785 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [929238923] [2023-12-02 17:44:37,785 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 17:44:37,785 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 17:44:37,786 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9baea50c-125b-415c-97d3-07da8d4dc433/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 17:44:37,787 INFO L229 MonitoredProcess]: Starting monitored process 5 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9baea50c-125b-415c-97d3-07da8d4dc433/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 17:44:37,793 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9baea50c-125b-415c-97d3-07da8d4dc433/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2023-12-02 17:44:37,849 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 17:44:37,850 INFO L262 TraceCheckSpWp]: Trace formula consists of 96 conjuncts, 5 conjunts are in the unsatisfiable core [2023-12-02 17:44:37,852 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 17:44:37,888 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 2 proven. 0 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2023-12-02 17:44:37,889 INFO L323 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2023-12-02 17:44:37,889 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 17:44:37,889 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1065903235] [2023-12-02 17:44:37,889 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2023-12-02 17:44:37,889 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [929238923] [2023-12-02 17:44:37,890 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [929238923] provided 1 perfect and 0 imperfect interpolant sequences [2023-12-02 17:44:37,890 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-12-02 17:44:37,890 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2023-12-02 17:44:37,890 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [192284420] [2023-12-02 17:44:37,890 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-12-02 17:44:37,891 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2023-12-02 17:44:37,891 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 17:44:37,891 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2023-12-02 17:44:37,892 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2023-12-02 17:44:37,892 INFO L87 Difference]: Start difference. First operand 31 states and 41 transitions. Second operand has 5 states, 5 states have (on average 2.8) internal successors, (14), 4 states have internal predecessors, (14), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) [2023-12-02 17:44:37,918 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 17:44:37,918 INFO L93 Difference]: Finished difference Result 55 states and 75 transitions. [2023-12-02 17:44:37,918 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2023-12-02 17:44:37,919 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 2.8) internal successors, (14), 4 states have internal predecessors, (14), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) Word has length 20 [2023-12-02 17:44:37,919 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 17:44:37,920 INFO L225 Difference]: With dead ends: 55 [2023-12-02 17:44:37,920 INFO L226 Difference]: Without dead ends: 33 [2023-12-02 17:44:37,920 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 19 GetRequests, 16 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 17:44:37,921 INFO L413 NwaCegarLoop]: 33 mSDtfsCounter, 0 mSDsluCounter, 86 mSDsCounter, 0 mSdLazyCounter, 19 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 119 SdHoareTripleChecker+Invalid, 19 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 19 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2023-12-02 17:44:37,922 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [0 Valid, 119 Invalid, 19 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 19 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2023-12-02 17:44:37,923 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 33 states. [2023-12-02 17:44:37,928 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 33 to 33. [2023-12-02 17:44:37,928 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 33 states, 23 states have (on average 1.3043478260869565) internal successors, (30), 24 states have internal predecessors, (30), 7 states have call successors, (7), 2 states have call predecessors, (7), 2 states have return successors, (6), 6 states have call predecessors, (6), 6 states have call successors, (6) [2023-12-02 17:44:37,929 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 33 states to 33 states and 43 transitions. [2023-12-02 17:44:37,929 INFO L78 Accepts]: Start accepts. Automaton has 33 states and 43 transitions. Word has length 20 [2023-12-02 17:44:37,929 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 17:44:37,930 INFO L495 AbstractCegarLoop]: Abstraction has 33 states and 43 transitions. [2023-12-02 17:44:37,930 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 2.8) internal successors, (14), 4 states have internal predecessors, (14), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) [2023-12-02 17:44:37,930 INFO L276 IsEmpty]: Start isEmpty. Operand 33 states and 43 transitions. [2023-12-02 17:44:37,931 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2023-12-02 17:44:37,931 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 17:44:37,931 INFO L195 NwaCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-12-02 17:44:37,936 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9baea50c-125b-415c-97d3-07da8d4dc433/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Forceful destruction successful, exit code 0 [2023-12-02 17:44:38,131 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3,5 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9baea50c-125b-415c-97d3-07da8d4dc433/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 17:44:38,132 INFO L420 AbstractCegarLoop]: === Iteration 5 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 17:44:38,132 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 17:44:38,132 INFO L85 PathProgramCache]: Analyzing trace with hash 148941760, now seen corresponding path program 1 times [2023-12-02 17:44:38,132 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 17:44:38,132 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [146293717] [2023-12-02 17:44:38,132 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 17:44:38,132 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 17:44:38,143 ERROR L246 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2023-12-02 17:44:38,143 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1324970770] [2023-12-02 17:44:38,143 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 17:44:38,143 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 17:44:38,143 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9baea50c-125b-415c-97d3-07da8d4dc433/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 17:44:38,144 INFO L229 MonitoredProcess]: Starting monitored process 6 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9baea50c-125b-415c-97d3-07da8d4dc433/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 17:44:38,145 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9baea50c-125b-415c-97d3-07da8d4dc433/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2023-12-02 17:44:38,191 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 17:44:38,193 INFO L262 TraceCheckSpWp]: Trace formula consists of 89 conjuncts, 18 conjunts are in the unsatisfiable core [2023-12-02 17:44:38,195 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 17:44:38,385 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 1 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2023-12-02 17:44:38,386 INFO L323 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2023-12-02 17:44:38,386 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 17:44:38,386 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [146293717] [2023-12-02 17:44:38,386 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2023-12-02 17:44:38,386 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1324970770] [2023-12-02 17:44:38,386 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1324970770] provided 1 perfect and 0 imperfect interpolant sequences [2023-12-02 17:44:38,387 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-12-02 17:44:38,387 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [8] imperfect sequences [] total 8 [2023-12-02 17:44:38,387 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [851498596] [2023-12-02 17:44:38,387 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-12-02 17:44:38,387 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2023-12-02 17:44:38,388 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 17:44:38,388 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2023-12-02 17:44:38,388 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=16, Invalid=40, Unknown=0, NotChecked=0, Total=56 [2023-12-02 17:44:38,389 INFO L87 Difference]: Start difference. First operand 33 states and 43 transitions. Second operand has 8 states, 6 states have (on average 2.5) internal successors, (15), 6 states have internal predecessors, (15), 2 states have call successors, (3), 2 states have call predecessors, (3), 2 states have return successors, (2), 2 states have call predecessors, (2), 1 states have call successors, (2) [2023-12-02 17:44:38,476 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 17:44:38,476 INFO L93 Difference]: Finished difference Result 51 states and 68 transitions. [2023-12-02 17:44:38,476 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2023-12-02 17:44:38,477 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 6 states have (on average 2.5) internal successors, (15), 6 states have internal predecessors, (15), 2 states have call successors, (3), 2 states have call predecessors, (3), 2 states have return successors, (2), 2 states have call predecessors, (2), 1 states have call successors, (2) Word has length 20 [2023-12-02 17:44:38,477 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 17:44:38,478 INFO L225 Difference]: With dead ends: 51 [2023-12-02 17:44:38,478 INFO L226 Difference]: Without dead ends: 49 [2023-12-02 17:44:38,478 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 20 GetRequests, 13 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=20, Invalid=52, Unknown=0, NotChecked=0, Total=72 [2023-12-02 17:44:38,479 INFO L413 NwaCegarLoop]: 28 mSDtfsCounter, 53 mSDsluCounter, 102 mSDsCounter, 0 mSdLazyCounter, 60 mSolverCounterSat, 8 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 61 SdHoareTripleChecker+Valid, 130 SdHoareTripleChecker+Invalid, 68 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 8 IncrementalHoareTripleChecker+Valid, 60 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-12-02 17:44:38,479 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [61 Valid, 130 Invalid, 68 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [8 Valid, 60 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-12-02 17:44:38,480 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 49 states. [2023-12-02 17:44:38,489 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 49 to 48. [2023-12-02 17:44:38,490 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 48 states, 33 states have (on average 1.3333333333333333) internal successors, (44), 34 states have internal predecessors, (44), 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) [2023-12-02 17:44:38,491 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 48 states to 48 states and 65 transitions. [2023-12-02 17:44:38,491 INFO L78 Accepts]: Start accepts. Automaton has 48 states and 65 transitions. Word has length 20 [2023-12-02 17:44:38,491 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 17:44:38,492 INFO L495 AbstractCegarLoop]: Abstraction has 48 states and 65 transitions. [2023-12-02 17:44:38,492 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 8 states, 6 states have (on average 2.5) internal successors, (15), 6 states have internal predecessors, (15), 2 states have call successors, (3), 2 states have call predecessors, (3), 2 states have return successors, (2), 2 states have call predecessors, (2), 1 states have call successors, (2) [2023-12-02 17:44:38,492 INFO L276 IsEmpty]: Start isEmpty. Operand 48 states and 65 transitions. [2023-12-02 17:44:38,493 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2023-12-02 17:44:38,493 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 17:44:38,493 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-12-02 17:44:38,498 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9baea50c-125b-415c-97d3-07da8d4dc433/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Ended with exit code 0 [2023-12-02 17:44:38,698 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,6 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9baea50c-125b-415c-97d3-07da8d4dc433/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 17:44:38,698 INFO L420 AbstractCegarLoop]: === Iteration 6 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 17:44:38,699 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 17:44:38,699 INFO L85 PathProgramCache]: Analyzing trace with hash -1894324762, now seen corresponding path program 1 times [2023-12-02 17:44:38,699 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 17:44:38,699 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1139572256] [2023-12-02 17:44:38,699 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 17:44:38,699 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 17:44:38,712 ERROR L246 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2023-12-02 17:44:38,712 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1316689053] [2023-12-02 17:44:38,712 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 17:44:38,713 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 17:44:38,713 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9baea50c-125b-415c-97d3-07da8d4dc433/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 17:44:38,714 INFO L229 MonitoredProcess]: Starting monitored process 7 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9baea50c-125b-415c-97d3-07da8d4dc433/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 17:44:38,715 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9baea50c-125b-415c-97d3-07da8d4dc433/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Waiting until timeout for monitored process [2023-12-02 17:44:38,762 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 17:44:38,763 INFO L262 TraceCheckSpWp]: Trace formula consists of 97 conjuncts, 7 conjunts are in the unsatisfiable core [2023-12-02 17:44:38,765 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 17:44:38,806 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2023-12-02 17:44:38,806 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-12-02 17:44:38,877 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2023-12-02 17:44:38,877 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 17:44:38,877 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1139572256] [2023-12-02 17:44:38,877 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2023-12-02 17:44:38,878 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1316689053] [2023-12-02 17:44:38,878 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1316689053] provided 0 perfect and 2 imperfect interpolant sequences [2023-12-02 17:44:38,878 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [984581148] [2023-12-02 17:44:38,895 INFO L159 IcfgInterpreter]: Started Sifa with 18 locations of interest [2023-12-02 17:44:38,895 INFO L166 IcfgInterpreter]: Building call graph [2023-12-02 17:44:38,898 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-12-02 17:44:38,902 INFO L176 IcfgInterpreter]: Starting interpretation [2023-12-02 17:44:38,902 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-12-02 17:44:39,914 WARN L110 ntervalStateProvider]: Interval conversion did not stabilize in 11 iterations. Over-approximation may be very coarse. [2023-12-02 17:44:39,985 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 64 for LOIs [2023-12-02 17:44:40,034 INFO L180 IcfgInterpreter]: Interpretation finished [2023-12-02 17:44:41,667 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSifa [984581148] provided 1 perfect and 0 imperfect interpolant sequences [2023-12-02 17:44:41,667 INFO L185 FreeRefinementEngine]: Found 1 perfect and 2 imperfect interpolant sequences. [2023-12-02 17:44:41,667 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [13] imperfect sequences [5, 6] total 22 [2023-12-02 17:44:41,668 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [937395292] [2023-12-02 17:44:41,668 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-12-02 17:44:41,668 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 14 states [2023-12-02 17:44:41,669 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 17:44:41,669 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2023-12-02 17:44:41,670 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=122, Invalid=340, Unknown=0, NotChecked=0, Total=462 [2023-12-02 17:44:41,670 INFO L87 Difference]: Start difference. First operand 48 states and 65 transitions. Second operand has 14 states, 11 states have (on average 1.2727272727272727) internal successors, (14), 10 states have internal predecessors, (14), 3 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2023-12-02 17:44:42,121 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 17:44:42,121 INFO L93 Difference]: Finished difference Result 80 states and 111 transitions. [2023-12-02 17:44:42,123 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2023-12-02 17:44:42,123 INFO L78 Accepts]: Start accepts. Automaton has has 14 states, 11 states have (on average 1.2727272727272727) internal successors, (14), 10 states have internal predecessors, (14), 3 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) Word has length 21 [2023-12-02 17:44:42,123 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 17:44:42,125 INFO L225 Difference]: With dead ends: 80 [2023-12-02 17:44:42,125 INFO L226 Difference]: Without dead ends: 58 [2023-12-02 17:44:42,126 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 63 GetRequests, 41 SyntacticMatches, 0 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 165 ImplicationChecksByTransitivity, 1.9s TimeCoverageRelationStatistics Valid=142, Invalid=410, Unknown=0, NotChecked=0, Total=552 [2023-12-02 17:44:42,127 INFO L413 NwaCegarLoop]: 24 mSDtfsCounter, 4 mSDsluCounter, 149 mSDsCounter, 0 mSdLazyCounter, 148 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 4 SdHoareTripleChecker+Valid, 173 SdHoareTripleChecker+Invalid, 151 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 148 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2023-12-02 17:44:42,127 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [4 Valid, 173 Invalid, 151 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 148 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2023-12-02 17:44:42,128 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 58 states. [2023-12-02 17:44:42,150 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 58 to 56. [2023-12-02 17:44:42,150 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 56 states, 41 states have (on average 1.3170731707317074) internal successors, (54), 42 states have internal predecessors, (54), 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) [2023-12-02 17:44:42,152 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 56 states to 56 states and 75 transitions. [2023-12-02 17:44:42,152 INFO L78 Accepts]: Start accepts. Automaton has 56 states and 75 transitions. Word has length 21 [2023-12-02 17:44:42,152 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 17:44:42,152 INFO L495 AbstractCegarLoop]: Abstraction has 56 states and 75 transitions. [2023-12-02 17:44:42,152 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 14 states, 11 states have (on average 1.2727272727272727) internal successors, (14), 10 states have internal predecessors, (14), 3 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2023-12-02 17:44:42,153 INFO L276 IsEmpty]: Start isEmpty. Operand 56 states and 75 transitions. [2023-12-02 17:44:42,153 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 26 [2023-12-02 17:44:42,153 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 17:44:42,153 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-12-02 17:44:42,158 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9baea50c-125b-415c-97d3-07da8d4dc433/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Ended with exit code 0 [2023-12-02 17:44:42,354 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5,7 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9baea50c-125b-415c-97d3-07da8d4dc433/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 17:44:42,354 INFO L420 AbstractCegarLoop]: === Iteration 7 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 17:44:42,355 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 17:44:42,355 INFO L85 PathProgramCache]: Analyzing trace with hash -1377591568, now seen corresponding path program 1 times [2023-12-02 17:44:42,355 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 17:44:42,355 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [285152788] [2023-12-02 17:44:42,356 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 17:44:42,356 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 17:44:42,368 ERROR L246 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2023-12-02 17:44:42,368 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [612803383] [2023-12-02 17:44:42,368 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 17:44:42,369 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 17:44:42,369 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9baea50c-125b-415c-97d3-07da8d4dc433/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 17:44:42,370 INFO L229 MonitoredProcess]: Starting monitored process 8 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9baea50c-125b-415c-97d3-07da8d4dc433/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 17:44:42,373 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9baea50c-125b-415c-97d3-07da8d4dc433/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Waiting until timeout for monitored process [2023-12-02 17:44:42,421 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 17:44:42,423 INFO L262 TraceCheckSpWp]: Trace formula consists of 98 conjuncts, 22 conjunts are in the unsatisfiable core [2023-12-02 17:44:42,425 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 17:44:42,571 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 2 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2023-12-02 17:44:42,571 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-12-02 17:44:42,642 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 17:44:42,642 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [285152788] [2023-12-02 17:44:42,643 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2023-12-02 17:44:42,643 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [612803383] [2023-12-02 17:44:42,643 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [612803383] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 17:44:42,643 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [653999977] [2023-12-02 17:44:42,646 INFO L159 IcfgInterpreter]: Started Sifa with 22 locations of interest [2023-12-02 17:44:42,646 INFO L166 IcfgInterpreter]: Building call graph [2023-12-02 17:44:42,647 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-12-02 17:44:42,647 INFO L176 IcfgInterpreter]: Starting interpretation [2023-12-02 17:44:42,647 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-12-02 17:44:43,027 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 36 for LOIs [2023-12-02 17:44:43,040 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 64 for LOIs [2023-12-02 17:44:43,079 INFO L180 IcfgInterpreter]: Interpretation finished [2023-12-02 17:44:44,570 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSifa [653999977] provided 1 perfect and 0 imperfect interpolant sequences [2023-12-02 17:44:44,570 INFO L185 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2023-12-02 17:44:44,570 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [17] imperfect sequences [9] total 25 [2023-12-02 17:44:44,570 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1128242868] [2023-12-02 17:44:44,570 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-12-02 17:44:44,571 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 18 states [2023-12-02 17:44:44,571 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 17:44:44,572 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2023-12-02 17:44:44,572 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=117, Invalid=639, Unknown=0, NotChecked=0, Total=756 [2023-12-02 17:44:44,572 INFO L87 Difference]: Start difference. First operand 56 states and 75 transitions. Second operand has 18 states, 14 states have (on average 1.1428571428571428) internal successors, (16), 13 states have internal predecessors, (16), 3 states have call successors, (4), 2 states have call predecessors, (4), 2 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2023-12-02 17:44:44,956 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 17:44:44,957 INFO L93 Difference]: Finished difference Result 110 states and 150 transitions. [2023-12-02 17:44:44,957 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2023-12-02 17:44:44,957 INFO L78 Accepts]: Start accepts. Automaton has has 18 states, 14 states have (on average 1.1428571428571428) internal successors, (16), 13 states have internal predecessors, (16), 3 states have call successors, (4), 2 states have call predecessors, (4), 2 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) Word has length 25 [2023-12-02 17:44:44,958 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 17:44:44,959 INFO L225 Difference]: With dead ends: 110 [2023-12-02 17:44:44,959 INFO L226 Difference]: Without dead ends: 73 [2023-12-02 17:44:44,960 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 54 GetRequests, 27 SyntacticMatches, 1 SemanticMatches, 26 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 204 ImplicationChecksByTransitivity, 1.5s TimeCoverageRelationStatistics Valid=117, Invalid=639, Unknown=0, NotChecked=0, Total=756 [2023-12-02 17:44:44,961 INFO L413 NwaCegarLoop]: 15 mSDtfsCounter, 2 mSDsluCounter, 107 mSDsCounter, 0 mSdLazyCounter, 423 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 5 SdHoareTripleChecker+Valid, 122 SdHoareTripleChecker+Invalid, 426 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 423 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2023-12-02 17:44:44,961 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [5 Valid, 122 Invalid, 426 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 423 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2023-12-02 17:44:44,962 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 73 states. [2023-12-02 17:44:44,976 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 73 to 70. [2023-12-02 17:44:44,976 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 70 states, 49 states have (on average 1.2653061224489797) internal successors, (62), 51 states have internal predecessors, (62), 15 states have call successors, (15), 5 states have call predecessors, (15), 5 states have return successors, (14), 13 states have call predecessors, (14), 14 states have call successors, (14) [2023-12-02 17:44:44,977 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 70 states to 70 states and 91 transitions. [2023-12-02 17:44:44,978 INFO L78 Accepts]: Start accepts. Automaton has 70 states and 91 transitions. Word has length 25 [2023-12-02 17:44:44,978 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 17:44:44,978 INFO L495 AbstractCegarLoop]: Abstraction has 70 states and 91 transitions. [2023-12-02 17:44:44,978 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 18 states, 14 states have (on average 1.1428571428571428) internal successors, (16), 13 states have internal predecessors, (16), 3 states have call successors, (4), 2 states have call predecessors, (4), 2 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2023-12-02 17:44:44,978 INFO L276 IsEmpty]: Start isEmpty. Operand 70 states and 91 transitions. [2023-12-02 17:44:44,979 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2023-12-02 17:44:44,979 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 17:44:44,979 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-12-02 17:44:44,985 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9baea50c-125b-415c-97d3-07da8d4dc433/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Forceful destruction successful, exit code 0 [2023-12-02 17:44:45,180 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 8 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9baea50c-125b-415c-97d3-07da8d4dc433/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable6 [2023-12-02 17:44:45,180 INFO L420 AbstractCegarLoop]: === Iteration 8 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 17:44:45,181 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 17:44:45,181 INFO L85 PathProgramCache]: Analyzing trace with hash -1856138177, now seen corresponding path program 1 times [2023-12-02 17:44:45,181 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 17:44:45,181 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [964720994] [2023-12-02 17:44:45,181 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 17:44:45,181 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 17:44:45,191 ERROR L246 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2023-12-02 17:44:45,191 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [103599642] [2023-12-02 17:44:45,191 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 17:44:45,191 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 17:44:45,192 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9baea50c-125b-415c-97d3-07da8d4dc433/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 17:44:45,192 INFO L229 MonitoredProcess]: Starting monitored process 9 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9baea50c-125b-415c-97d3-07da8d4dc433/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 17:44:45,193 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9baea50c-125b-415c-97d3-07da8d4dc433/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Waiting until timeout for monitored process [2023-12-02 17:44:45,242 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 17:44:45,244 INFO L262 TraceCheckSpWp]: Trace formula consists of 117 conjuncts, 29 conjunts are in the unsatisfiable core [2023-12-02 17:44:45,246 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 17:44:45,424 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 0 proven. 7 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2023-12-02 17:44:45,424 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-12-02 17:44:45,505 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2023-12-02 17:44:45,505 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 17:44:45,506 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [964720994] [2023-12-02 17:44:45,506 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2023-12-02 17:44:45,506 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [103599642] [2023-12-02 17:44:45,506 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [103599642] provided 0 perfect and 2 imperfect interpolant sequences [2023-12-02 17:44:45,506 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [448930970] [2023-12-02 17:44:45,508 INFO L159 IcfgInterpreter]: Started Sifa with 20 locations of interest [2023-12-02 17:44:45,509 INFO L166 IcfgInterpreter]: Building call graph [2023-12-02 17:44:45,509 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-12-02 17:44:45,509 INFO L176 IcfgInterpreter]: Starting interpretation [2023-12-02 17:44:45,509 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-12-02 17:44:46,162 WARN L110 ntervalStateProvider]: Interval conversion did not stabilize in 11 iterations. Over-approximation may be very coarse. [2023-12-02 17:44:46,207 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 91 for LOIs [2023-12-02 17:44:46,301 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 64 for LOIs [2023-12-02 17:44:46,325 INFO L180 IcfgInterpreter]: Interpretation finished [2023-12-02 17:44:48,866 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSifa [448930970] provided 1 perfect and 0 imperfect interpolant sequences [2023-12-02 17:44:48,866 INFO L185 FreeRefinementEngine]: Found 1 perfect and 2 imperfect interpolant sequences. [2023-12-02 17:44:48,866 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [18] imperfect sequences [9, 6] total 30 [2023-12-02 17:44:48,866 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [410877938] [2023-12-02 17:44:48,867 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-12-02 17:44:48,867 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 19 states [2023-12-02 17:44:48,867 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 17:44:48,867 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2023-12-02 17:44:48,868 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=118, Invalid=752, Unknown=0, NotChecked=0, Total=870 [2023-12-02 17:44:48,868 INFO L87 Difference]: Start difference. First operand 70 states and 91 transitions. Second operand has 19 states, 15 states have (on average 1.0666666666666667) internal successors, (16), 14 states have internal predecessors, (16), 3 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2023-12-02 17:44:49,435 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 17:44:49,436 INFO L93 Difference]: Finished difference Result 106 states and 143 transitions. [2023-12-02 17:44:49,436 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2023-12-02 17:44:49,436 INFO L78 Accepts]: Start accepts. Automaton has has 19 states, 15 states have (on average 1.0666666666666667) internal successors, (16), 14 states have internal predecessors, (16), 3 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) Word has length 27 [2023-12-02 17:44:49,436 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 17:44:49,437 INFO L225 Difference]: With dead ends: 106 [2023-12-02 17:44:49,437 INFO L226 Difference]: Without dead ends: 84 [2023-12-02 17:44:49,438 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 81 GetRequests, 51 SyntacticMatches, 0 SemanticMatches, 30 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 219 ImplicationChecksByTransitivity, 2.8s TimeCoverageRelationStatistics Valid=130, Invalid=862, Unknown=0, NotChecked=0, Total=992 [2023-12-02 17:44:49,439 INFO L413 NwaCegarLoop]: 14 mSDtfsCounter, 8 mSDsluCounter, 58 mSDsCounter, 0 mSdLazyCounter, 264 mSolverCounterSat, 5 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 12 SdHoareTripleChecker+Valid, 72 SdHoareTripleChecker+Invalid, 269 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 5 IncrementalHoareTripleChecker+Valid, 264 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2023-12-02 17:44:49,439 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [12 Valid, 72 Invalid, 269 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [5 Valid, 264 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2023-12-02 17:44:49,440 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 84 states. [2023-12-02 17:44:49,465 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 84 to 80. [2023-12-02 17:44:49,465 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 80 states, 54 states have (on average 1.2407407407407407) internal successors, (67), 57 states have internal predecessors, (67), 19 states have call successors, (19), 6 states have call predecessors, (19), 6 states have return successors, (18), 16 states have call predecessors, (18), 18 states have call successors, (18) [2023-12-02 17:44:49,466 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 80 states to 80 states and 104 transitions. [2023-12-02 17:44:49,466 INFO L78 Accepts]: Start accepts. Automaton has 80 states and 104 transitions. Word has length 27 [2023-12-02 17:44:49,467 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 17:44:49,467 INFO L495 AbstractCegarLoop]: Abstraction has 80 states and 104 transitions. [2023-12-02 17:44:49,467 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 19 states, 15 states have (on average 1.0666666666666667) internal successors, (16), 14 states have internal predecessors, (16), 3 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2023-12-02 17:44:49,467 INFO L276 IsEmpty]: Start isEmpty. Operand 80 states and 104 transitions. [2023-12-02 17:44:49,469 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 48 [2023-12-02 17:44:49,469 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 17:44:49,469 INFO L195 NwaCegarLoop]: trace histogram [5, 4, 4, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-12-02 17:44:49,474 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9baea50c-125b-415c-97d3-07da8d4dc433/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Ended with exit code 0 [2023-12-02 17:44:49,670 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9baea50c-125b-415c-97d3-07da8d4dc433/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable7 [2023-12-02 17:44:49,670 INFO L420 AbstractCegarLoop]: === Iteration 9 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 17:44:49,670 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 17:44:49,670 INFO L85 PathProgramCache]: Analyzing trace with hash -301475410, now seen corresponding path program 1 times [2023-12-02 17:44:49,670 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 17:44:49,670 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1038729949] [2023-12-02 17:44:49,671 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 17:44:49,671 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 17:44:49,681 ERROR L246 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2023-12-02 17:44:49,681 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [46168873] [2023-12-02 17:44:49,682 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 17:44:49,682 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 17:44:49,682 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9baea50c-125b-415c-97d3-07da8d4dc433/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 17:44:49,683 INFO L229 MonitoredProcess]: Starting monitored process 10 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9baea50c-125b-415c-97d3-07da8d4dc433/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 17:44:49,684 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9baea50c-125b-415c-97d3-07da8d4dc433/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Waiting until timeout for monitored process [2023-12-02 17:44:49,737 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 17:44:49,738 INFO L262 TraceCheckSpWp]: Trace formula consists of 152 conjuncts, 9 conjunts are in the unsatisfiable core [2023-12-02 17:44:49,740 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 17:44:49,795 INFO L134 CoverageAnalysis]: Checked inductivity of 38 backedges. 10 proven. 2 refuted. 0 times theorem prover too weak. 26 trivial. 0 not checked. [2023-12-02 17:44:49,795 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-12-02 17:44:49,857 INFO L134 CoverageAnalysis]: Checked inductivity of 38 backedges. 10 proven. 2 refuted. 0 times theorem prover too weak. 26 trivial. 0 not checked. [2023-12-02 17:44:49,857 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 17:44:49,857 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1038729949] [2023-12-02 17:44:49,858 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2023-12-02 17:44:49,858 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [46168873] [2023-12-02 17:44:49,858 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [46168873] provided 0 perfect and 2 imperfect interpolant sequences [2023-12-02 17:44:49,858 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1961576262] [2023-12-02 17:44:49,861 INFO L159 IcfgInterpreter]: Started Sifa with 28 locations of interest [2023-12-02 17:44:49,861 INFO L166 IcfgInterpreter]: Building call graph [2023-12-02 17:44:49,861 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-12-02 17:44:49,861 INFO L176 IcfgInterpreter]: Starting interpretation [2023-12-02 17:44:49,861 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-12-02 17:44:53,363 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 86 for LOIs [2023-12-02 17:44:53,486 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 64 for LOIs [2023-12-02 17:44:53,521 INFO L180 IcfgInterpreter]: Interpretation finished [2023-12-02 17:44:55,601 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '2338#(and (<= 1 |#StackHeapBarrier|) (= |__VERIFIER_assert_#in~cond| 0) (= __VERIFIER_assert_~cond 0) (<= ~counter~0 5) (<= 3 ~counter~0))' at error location [2023-12-02 17:44:55,601 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-12-02 17:44:55,601 INFO L185 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2023-12-02 17:44:55,601 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 7] total 12 [2023-12-02 17:44:55,601 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1532345888] [2023-12-02 17:44:55,602 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2023-12-02 17:44:55,602 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 12 states [2023-12-02 17:44:55,602 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 17:44:55,603 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2023-12-02 17:44:55,603 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=222, Invalid=708, Unknown=0, NotChecked=0, Total=930 [2023-12-02 17:44:55,604 INFO L87 Difference]: Start difference. First operand 80 states and 104 transitions. Second operand has 12 states, 12 states have (on average 3.5) internal successors, (42), 12 states have internal predecessors, (42), 5 states have call successors, (13), 4 states have call predecessors, (13), 3 states have return successors, (12), 4 states have call predecessors, (12), 4 states have call successors, (12) [2023-12-02 17:44:55,820 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 17:44:55,820 INFO L93 Difference]: Finished difference Result 275 states and 366 transitions. [2023-12-02 17:44:55,821 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2023-12-02 17:44:55,821 INFO L78 Accepts]: Start accepts. Automaton has has 12 states, 12 states have (on average 3.5) internal successors, (42), 12 states have internal predecessors, (42), 5 states have call successors, (13), 4 states have call predecessors, (13), 3 states have return successors, (12), 4 states have call predecessors, (12), 4 states have call successors, (12) Word has length 47 [2023-12-02 17:44:55,821 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 17:44:55,824 INFO L225 Difference]: With dead ends: 275 [2023-12-02 17:44:55,824 INFO L226 Difference]: Without dead ends: 253 [2023-12-02 17:44:55,825 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 144 GetRequests, 106 SyntacticMatches, 4 SemanticMatches, 34 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 590 ImplicationChecksByTransitivity, 2.2s TimeCoverageRelationStatistics Valid=269, Invalid=991, Unknown=0, NotChecked=0, Total=1260 [2023-12-02 17:44:55,825 INFO L413 NwaCegarLoop]: 34 mSDtfsCounter, 108 mSDsluCounter, 222 mSDsCounter, 0 mSdLazyCounter, 135 mSolverCounterSat, 10 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 108 SdHoareTripleChecker+Valid, 256 SdHoareTripleChecker+Invalid, 145 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 10 IncrementalHoareTripleChecker+Valid, 135 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-12-02 17:44:55,826 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [108 Valid, 256 Invalid, 145 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [10 Valid, 135 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-12-02 17:44:55,827 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 253 states. [2023-12-02 17:44:55,873 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 253 to 227. [2023-12-02 17:44:55,873 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 227 states, 156 states have (on average 1.2756410256410255) internal successors, (199), 162 states have internal predecessors, (199), 54 states have call successors, (54), 16 states have call predecessors, (54), 16 states have return successors, (50), 48 states have call predecessors, (50), 50 states have call successors, (50) [2023-12-02 17:44:55,876 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 227 states to 227 states and 303 transitions. [2023-12-02 17:44:55,877 INFO L78 Accepts]: Start accepts. Automaton has 227 states and 303 transitions. Word has length 47 [2023-12-02 17:44:55,877 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 17:44:55,877 INFO L495 AbstractCegarLoop]: Abstraction has 227 states and 303 transitions. [2023-12-02 17:44:55,877 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 12 states, 12 states have (on average 3.5) internal successors, (42), 12 states have internal predecessors, (42), 5 states have call successors, (13), 4 states have call predecessors, (13), 3 states have return successors, (12), 4 states have call predecessors, (12), 4 states have call successors, (12) [2023-12-02 17:44:55,877 INFO L276 IsEmpty]: Start isEmpty. Operand 227 states and 303 transitions. [2023-12-02 17:44:55,880 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 49 [2023-12-02 17:44:55,880 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 17:44:55,880 INFO L195 NwaCegarLoop]: trace histogram [6, 5, 5, 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 17:44:55,886 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9baea50c-125b-415c-97d3-07da8d4dc433/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Ended with exit code 0 [2023-12-02 17:44:56,084 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 10 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9baea50c-125b-415c-97d3-07da8d4dc433/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable8 [2023-12-02 17:44:56,085 INFO L420 AbstractCegarLoop]: === Iteration 10 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 17:44:56,085 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 17:44:56,085 INFO L85 PathProgramCache]: Analyzing trace with hash 170701079, now seen corresponding path program 1 times [2023-12-02 17:44:56,085 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 17:44:56,086 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [62796998] [2023-12-02 17:44:56,086 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 17:44:56,086 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 17:44:56,095 ERROR L246 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2023-12-02 17:44:56,095 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1686960941] [2023-12-02 17:44:56,095 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 17:44:56,095 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 17:44:56,095 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9baea50c-125b-415c-97d3-07da8d4dc433/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 17:44:56,096 INFO L229 MonitoredProcess]: Starting monitored process 11 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9baea50c-125b-415c-97d3-07da8d4dc433/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 17:44:56,097 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9baea50c-125b-415c-97d3-07da8d4dc433/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Waiting until timeout for monitored process [2023-12-02 17:44:56,143 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 17:44:56,144 INFO L262 TraceCheckSpWp]: Trace formula consists of 144 conjuncts, 11 conjunts are in the unsatisfiable core [2023-12-02 17:44:56,146 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 17:44:56,186 INFO L134 CoverageAnalysis]: Checked inductivity of 56 backedges. 16 proven. 10 refuted. 0 times theorem prover too weak. 30 trivial. 0 not checked. [2023-12-02 17:44:56,186 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-12-02 17:44:56,243 INFO L134 CoverageAnalysis]: Checked inductivity of 56 backedges. 16 proven. 10 refuted. 0 times theorem prover too weak. 30 trivial. 0 not checked. [2023-12-02 17:44:56,243 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 17:44:56,244 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [62796998] [2023-12-02 17:44:56,244 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2023-12-02 17:44:56,244 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1686960941] [2023-12-02 17:44:56,244 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1686960941] provided 0 perfect and 2 imperfect interpolant sequences [2023-12-02 17:44:56,244 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1689323438] [2023-12-02 17:44:56,246 INFO L159 IcfgInterpreter]: Started Sifa with 25 locations of interest [2023-12-02 17:44:56,246 INFO L166 IcfgInterpreter]: Building call graph [2023-12-02 17:44:56,246 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-12-02 17:44:56,246 INFO L176 IcfgInterpreter]: Starting interpretation [2023-12-02 17:44:56,246 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-12-02 17:44:58,796 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 9 for LOIs [2023-12-02 17:44:58,802 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 64 for LOIs [2023-12-02 17:44:58,826 INFO L180 IcfgInterpreter]: Interpretation finished [2023-12-02 17:45:00,867 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '3380#(and (<= 1 |#StackHeapBarrier|) (= |__VERIFIER_assert_#in~cond| 0) (= __VERIFIER_assert_~cond 0) (<= ~counter~0 20) (<= 3 ~counter~0))' at error location [2023-12-02 17:45:00,867 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-12-02 17:45:00,867 INFO L185 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2023-12-02 17:45:00,868 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 6] total 9 [2023-12-02 17:45:00,868 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [606400318] [2023-12-02 17:45:00,868 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2023-12-02 17:45:00,869 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 9 states [2023-12-02 17:45:00,869 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 17:45:00,869 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2023-12-02 17:45:00,870 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=110, Invalid=820, Unknown=0, NotChecked=0, Total=930 [2023-12-02 17:45:00,870 INFO L87 Difference]: Start difference. First operand 227 states and 303 transitions. Second operand has 9 states, 9 states have (on average 3.0) internal successors, (27), 8 states have internal predecessors, (27), 2 states have call successors, (9), 3 states have call predecessors, (9), 2 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) [2023-12-02 17:45:00,999 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 17:45:00,999 INFO L93 Difference]: Finished difference Result 273 states and 356 transitions. [2023-12-02 17:45:00,999 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2023-12-02 17:45:00,999 INFO L78 Accepts]: Start accepts. Automaton has has 9 states, 9 states have (on average 3.0) internal successors, (27), 8 states have internal predecessors, (27), 2 states have call successors, (9), 3 states have call predecessors, (9), 2 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) Word has length 48 [2023-12-02 17:45:01,000 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 17:45:01,002 INFO L225 Difference]: With dead ends: 273 [2023-12-02 17:45:01,002 INFO L226 Difference]: Without dead ends: 271 [2023-12-02 17:45:01,003 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 144 GetRequests, 113 SyntacticMatches, 0 SemanticMatches, 31 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 278 ImplicationChecksByTransitivity, 2.1s TimeCoverageRelationStatistics Valid=126, Invalid=930, Unknown=0, NotChecked=0, Total=1056 [2023-12-02 17:45:01,004 INFO L413 NwaCegarLoop]: 27 mSDtfsCounter, 24 mSDsluCounter, 110 mSDsCounter, 0 mSdLazyCounter, 85 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 24 SdHoareTripleChecker+Valid, 137 SdHoareTripleChecker+Invalid, 87 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 85 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-12-02 17:45:01,004 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [24 Valid, 137 Invalid, 87 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 85 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-12-02 17:45:01,005 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 271 states. [2023-12-02 17:45:01,047 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 271 to 269. [2023-12-02 17:45:01,048 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 269 states, 188 states have (on average 1.2553191489361701) internal successors, (236), 196 states have internal predecessors, (236), 58 states have call successors, (58), 22 states have call predecessors, (58), 22 states have return successors, (54), 50 states have call predecessors, (54), 54 states have call successors, (54) [2023-12-02 17:45:01,050 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 269 states to 269 states and 348 transitions. [2023-12-02 17:45:01,050 INFO L78 Accepts]: Start accepts. Automaton has 269 states and 348 transitions. Word has length 48 [2023-12-02 17:45:01,051 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 17:45:01,051 INFO L495 AbstractCegarLoop]: Abstraction has 269 states and 348 transitions. [2023-12-02 17:45:01,051 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 9 states, 9 states have (on average 3.0) internal successors, (27), 8 states have internal predecessors, (27), 2 states have call successors, (9), 3 states have call predecessors, (9), 2 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) [2023-12-02 17:45:01,051 INFO L276 IsEmpty]: Start isEmpty. Operand 269 states and 348 transitions. [2023-12-02 17:45:01,053 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 49 [2023-12-02 17:45:01,053 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 17:45:01,053 INFO L195 NwaCegarLoop]: trace histogram [5, 4, 4, 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, 1, 1, 1, 1, 1] [2023-12-02 17:45:01,058 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9baea50c-125b-415c-97d3-07da8d4dc433/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Ended with exit code 0 [2023-12-02 17:45:01,254 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 11 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9baea50c-125b-415c-97d3-07da8d4dc433/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable9 [2023-12-02 17:45:01,254 INFO L420 AbstractCegarLoop]: === Iteration 11 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 17:45:01,254 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 17:45:01,254 INFO L85 PathProgramCache]: Analyzing trace with hash -339484245, now seen corresponding path program 1 times [2023-12-02 17:45:01,254 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 17:45:01,255 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2115585785] [2023-12-02 17:45:01,255 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 17:45:01,255 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 17:45:01,264 ERROR L246 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2023-12-02 17:45:01,264 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [2047458308] [2023-12-02 17:45:01,264 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 17:45:01,265 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 17:45:01,265 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9baea50c-125b-415c-97d3-07da8d4dc433/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 17:45:01,266 INFO L229 MonitoredProcess]: Starting monitored process 12 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9baea50c-125b-415c-97d3-07da8d4dc433/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 17:45:01,267 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9baea50c-125b-415c-97d3-07da8d4dc433/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Waiting until timeout for monitored process [2023-12-02 17:45:01,311 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 17:45:01,312 INFO L262 TraceCheckSpWp]: Trace formula consists of 153 conjuncts, 11 conjunts are in the unsatisfiable core [2023-12-02 17:45:01,313 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 17:45:01,366 INFO L134 CoverageAnalysis]: Checked inductivity of 39 backedges. 8 proven. 5 refuted. 0 times theorem prover too weak. 26 trivial. 0 not checked. [2023-12-02 17:45:01,366 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-12-02 17:45:01,432 INFO L134 CoverageAnalysis]: Checked inductivity of 39 backedges. 8 proven. 5 refuted. 0 times theorem prover too weak. 26 trivial. 0 not checked. [2023-12-02 17:45:01,432 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 17:45:01,432 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2115585785] [2023-12-02 17:45:01,432 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2023-12-02 17:45:01,432 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2047458308] [2023-12-02 17:45:01,433 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2047458308] provided 0 perfect and 2 imperfect interpolant sequences [2023-12-02 17:45:01,433 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1591785333] [2023-12-02 17:45:01,435 INFO L159 IcfgInterpreter]: Started Sifa with 28 locations of interest [2023-12-02 17:45:01,435 INFO L166 IcfgInterpreter]: Building call graph [2023-12-02 17:45:01,436 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-12-02 17:45:01,436 INFO L176 IcfgInterpreter]: Starting interpretation [2023-12-02 17:45:01,436 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-12-02 17:45:04,889 WARN L110 ntervalStateProvider]: Interval conversion did not stabilize in 14 iterations. Over-approximation may be very coarse. [2023-12-02 17:45:04,889 WARN L110 ntervalStateProvider]: Interval conversion did not stabilize in 15 iterations. Over-approximation may be very coarse. [2023-12-02 17:45:04,890 WARN L110 ntervalStateProvider]: Interval conversion did not stabilize in 14 iterations. Over-approximation may be very coarse. [2023-12-02 17:45:04,890 WARN L110 ntervalStateProvider]: Interval conversion did not stabilize in 15 iterations. Over-approximation may be very coarse. [2023-12-02 17:45:04,965 WARN L110 ntervalStateProvider]: Interval conversion did not stabilize in 14 iterations. Over-approximation may be very coarse. [2023-12-02 17:45:04,965 WARN L110 ntervalStateProvider]: Interval conversion did not stabilize in 15 iterations. Over-approximation may be very coarse. [2023-12-02 17:45:04,966 WARN L110 ntervalStateProvider]: Interval conversion did not stabilize in 14 iterations. Over-approximation may be very coarse. [2023-12-02 17:45:04,966 WARN L110 ntervalStateProvider]: Interval conversion did not stabilize in 15 iterations. Over-approximation may be very coarse. [2023-12-02 17:45:07,242 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 9 for LOIs [2023-12-02 17:45:07,246 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 64 for LOIs [2023-12-02 17:45:07,266 INFO L180 IcfgInterpreter]: Interpretation finished [2023-12-02 17:45:13,625 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '4478#(and (<= 1 |#StackHeapBarrier|) (= |__VERIFIER_assert_#in~cond| 0) (= __VERIFIER_assert_~cond 0) (<= ~counter~0 21) (<= 3 ~counter~0))' at error location [2023-12-02 17:45:13,626 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-12-02 17:45:13,626 INFO L185 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2023-12-02 17:45:13,626 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 8] total 14 [2023-12-02 17:45:13,626 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [412901260] [2023-12-02 17:45:13,626 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2023-12-02 17:45:13,627 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 14 states [2023-12-02 17:45:13,627 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 17:45:13,627 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2023-12-02 17:45:13,628 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=213, Invalid=1119, Unknown=0, NotChecked=0, Total=1332 [2023-12-02 17:45:13,628 INFO L87 Difference]: Start difference. First operand 269 states and 348 transitions. Second operand has 14 states, 14 states have (on average 3.357142857142857) internal successors, (47), 14 states have internal predecessors, (47), 5 states have call successors, (13), 4 states have call predecessors, (13), 3 states have return successors, (12), 4 states have call predecessors, (12), 4 states have call successors, (12) [2023-12-02 17:45:13,955 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 17:45:13,956 INFO L93 Difference]: Finished difference Result 433 states and 552 transitions. [2023-12-02 17:45:13,956 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2023-12-02 17:45:13,956 INFO L78 Accepts]: Start accepts. Automaton has has 14 states, 14 states have (on average 3.357142857142857) internal successors, (47), 14 states have internal predecessors, (47), 5 states have call successors, (13), 4 states have call predecessors, (13), 3 states have return successors, (12), 4 states have call predecessors, (12), 4 states have call successors, (12) Word has length 48 [2023-12-02 17:45:13,956 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 17:45:13,959 INFO L225 Difference]: With dead ends: 433 [2023-12-02 17:45:13,959 INFO L226 Difference]: Without dead ends: 411 [2023-12-02 17:45:13,960 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 149 GetRequests, 107 SyntacticMatches, 0 SemanticMatches, 42 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 635 ImplicationChecksByTransitivity, 6.5s TimeCoverageRelationStatistics Valid=289, Invalid=1603, Unknown=0, NotChecked=0, Total=1892 [2023-12-02 17:45:13,960 INFO L413 NwaCegarLoop]: 34 mSDtfsCounter, 191 mSDsluCounter, 197 mSDsCounter, 0 mSdLazyCounter, 131 mSolverCounterSat, 43 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 191 SdHoareTripleChecker+Valid, 231 SdHoareTripleChecker+Invalid, 174 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 43 IncrementalHoareTripleChecker+Valid, 131 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-12-02 17:45:13,960 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [191 Valid, 231 Invalid, 174 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [43 Valid, 131 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-12-02 17:45:13,961 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 411 states. [2023-12-02 17:45:14,016 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 411 to 330. [2023-12-02 17:45:14,017 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 330 states, 235 states have (on average 1.2595744680851064) internal successors, (296), 245 states have internal predecessors, (296), 69 states have call successors, (69), 25 states have call predecessors, (69), 25 states have return successors, (64), 59 states have call predecessors, (64), 64 states have call successors, (64) [2023-12-02 17:45:14,019 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 330 states to 330 states and 429 transitions. [2023-12-02 17:45:14,019 INFO L78 Accepts]: Start accepts. Automaton has 330 states and 429 transitions. Word has length 48 [2023-12-02 17:45:14,019 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 17:45:14,019 INFO L495 AbstractCegarLoop]: Abstraction has 330 states and 429 transitions. [2023-12-02 17:45:14,020 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 14 states, 14 states have (on average 3.357142857142857) internal successors, (47), 14 states have internal predecessors, (47), 5 states have call successors, (13), 4 states have call predecessors, (13), 3 states have return successors, (12), 4 states have call predecessors, (12), 4 states have call successors, (12) [2023-12-02 17:45:14,020 INFO L276 IsEmpty]: Start isEmpty. Operand 330 states and 429 transitions. [2023-12-02 17:45:14,021 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 50 [2023-12-02 17:45:14,021 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 17:45:14,021 INFO L195 NwaCegarLoop]: trace histogram [5, 4, 4, 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, 1, 1, 1, 1] [2023-12-02 17:45:14,025 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9baea50c-125b-415c-97d3-07da8d4dc433/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Forceful destruction successful, exit code 0 [2023-12-02 17:45:14,221 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 12 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9baea50c-125b-415c-97d3-07da8d4dc433/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable10 [2023-12-02 17:45:14,222 INFO L420 AbstractCegarLoop]: === Iteration 12 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 17:45:14,222 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 17:45:14,222 INFO L85 PathProgramCache]: Analyzing trace with hash -1953712133, now seen corresponding path program 1 times [2023-12-02 17:45:14,222 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 17:45:14,222 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1044811672] [2023-12-02 17:45:14,222 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 17:45:14,222 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 17:45:14,231 ERROR L246 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2023-12-02 17:45:14,231 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [999310398] [2023-12-02 17:45:14,231 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 17:45:14,231 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 17:45:14,232 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9baea50c-125b-415c-97d3-07da8d4dc433/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 17:45:14,232 INFO L229 MonitoredProcess]: Starting monitored process 13 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9baea50c-125b-415c-97d3-07da8d4dc433/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 17:45:14,234 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9baea50c-125b-415c-97d3-07da8d4dc433/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Waiting until timeout for monitored process [2023-12-02 17:45:14,280 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 17:45:14,282 INFO L262 TraceCheckSpWp]: Trace formula consists of 155 conjuncts, 56 conjunts are in the unsatisfiable core [2023-12-02 17:45:14,284 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 17:45:14,957 INFO L134 CoverageAnalysis]: Checked inductivity of 40 backedges. 10 proven. 14 refuted. 0 times theorem prover too weak. 16 trivial. 0 not checked. [2023-12-02 17:45:14,957 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-12-02 17:45:15,875 INFO L134 CoverageAnalysis]: Checked inductivity of 40 backedges. 10 proven. 13 refuted. 0 times theorem prover too weak. 17 trivial. 0 not checked. [2023-12-02 17:45:15,875 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 17:45:15,875 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1044811672] [2023-12-02 17:45:15,875 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2023-12-02 17:45:15,876 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [999310398] [2023-12-02 17:45:15,876 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [999310398] provided 0 perfect and 2 imperfect interpolant sequences [2023-12-02 17:45:15,876 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1283404112] [2023-12-02 17:45:15,878 INFO L159 IcfgInterpreter]: Started Sifa with 28 locations of interest [2023-12-02 17:45:15,878 INFO L166 IcfgInterpreter]: Building call graph [2023-12-02 17:45:15,878 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-12-02 17:45:15,879 INFO L176 IcfgInterpreter]: Starting interpretation [2023-12-02 17:45:15,879 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-12-02 17:45:19,486 WARN L110 ntervalStateProvider]: Interval conversion did not stabilize in 14 iterations. Over-approximation may be very coarse. [2023-12-02 17:45:19,487 WARN L110 ntervalStateProvider]: Interval conversion did not stabilize in 15 iterations. Over-approximation may be very coarse. [2023-12-02 17:45:19,488 WARN L110 ntervalStateProvider]: Interval conversion did not stabilize in 14 iterations. Over-approximation may be very coarse. [2023-12-02 17:45:19,488 WARN L110 ntervalStateProvider]: Interval conversion did not stabilize in 15 iterations. Over-approximation may be very coarse. [2023-12-02 17:45:19,564 WARN L110 ntervalStateProvider]: Interval conversion did not stabilize in 14 iterations. Over-approximation may be very coarse. [2023-12-02 17:45:19,564 WARN L110 ntervalStateProvider]: Interval conversion did not stabilize in 15 iterations. Over-approximation may be very coarse. [2023-12-02 17:45:19,565 WARN L110 ntervalStateProvider]: Interval conversion did not stabilize in 14 iterations. Over-approximation may be very coarse. [2023-12-02 17:45:19,565 WARN L110 ntervalStateProvider]: Interval conversion did not stabilize in 15 iterations. Over-approximation may be very coarse. [2023-12-02 17:45:21,802 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 8 for LOIs [2023-12-02 17:45:21,807 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 64 for LOIs [2023-12-02 17:45:21,838 INFO L180 IcfgInterpreter]: Interpretation finished [2023-12-02 17:45:33,817 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '5917#(and (<= 1 |#StackHeapBarrier|) (<= 1 ~counter~0) (= |__VERIFIER_assert_#in~cond| 0) (= __VERIFIER_assert_~cond 0) (<= ~counter~0 20))' at error location [2023-12-02 17:45:33,817 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-12-02 17:45:33,818 INFO L185 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2023-12-02 17:45:33,818 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 13] total 25 [2023-12-02 17:45:33,818 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1867484695] [2023-12-02 17:45:33,818 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2023-12-02 17:45:33,818 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 25 states [2023-12-02 17:45:33,818 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 17:45:33,819 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2023-12-02 17:45:33,819 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=243, Invalid=2013, Unknown=0, NotChecked=0, Total=2256 [2023-12-02 17:45:33,819 INFO L87 Difference]: Start difference. First operand 330 states and 429 transitions. Second operand has 25 states, 22 states have (on average 2.3636363636363638) internal successors, (52), 22 states have internal predecessors, (52), 7 states have call successors, (13), 3 states have call predecessors, (13), 3 states have return successors, (12), 5 states have call predecessors, (12), 5 states have call successors, (12) [2023-12-02 17:45:44,259 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 17:45:44,259 INFO L93 Difference]: Finished difference Result 814 states and 1108 transitions. [2023-12-02 17:45:44,259 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 35 states. [2023-12-02 17:45:44,259 INFO L78 Accepts]: Start accepts. Automaton has has 25 states, 22 states have (on average 2.3636363636363638) internal successors, (52), 22 states have internal predecessors, (52), 7 states have call successors, (13), 3 states have call predecessors, (13), 3 states have return successors, (12), 5 states have call predecessors, (12), 5 states have call successors, (12) Word has length 49 [2023-12-02 17:45:44,259 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 17:45:44,263 INFO L225 Difference]: With dead ends: 814 [2023-12-02 17:45:44,263 INFO L226 Difference]: Without dead ends: 651 [2023-12-02 17:45:44,265 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 172 GetRequests, 99 SyntacticMatches, 0 SemanticMatches, 73 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1531 ImplicationChecksByTransitivity, 18.2s TimeCoverageRelationStatistics Valid=693, Invalid=4857, Unknown=0, NotChecked=0, Total=5550 [2023-12-02 17:45:44,265 INFO L413 NwaCegarLoop]: 37 mSDtfsCounter, 283 mSDsluCounter, 597 mSDsCounter, 0 mSdLazyCounter, 623 mSolverCounterSat, 159 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 4.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 289 SdHoareTripleChecker+Valid, 634 SdHoareTripleChecker+Invalid, 782 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 159 IncrementalHoareTripleChecker+Valid, 623 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 4.7s IncrementalHoareTripleChecker+Time [2023-12-02 17:45:44,266 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [289 Valid, 634 Invalid, 782 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [159 Valid, 623 Invalid, 0 Unknown, 0 Unchecked, 4.7s Time] [2023-12-02 17:45:44,266 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 651 states. [2023-12-02 17:45:44,396 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 651 to 518. [2023-12-02 17:45:44,397 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 518 states, 381 states have (on average 1.2677165354330708) internal successors, (483), 388 states have internal predecessors, (483), 101 states have call successors, (101), 35 states have call predecessors, (101), 35 states have return successors, (98), 94 states have call predecessors, (98), 98 states have call successors, (98) [2023-12-02 17:45:44,400 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 518 states to 518 states and 682 transitions. [2023-12-02 17:45:44,401 INFO L78 Accepts]: Start accepts. Automaton has 518 states and 682 transitions. Word has length 49 [2023-12-02 17:45:44,401 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 17:45:44,401 INFO L495 AbstractCegarLoop]: Abstraction has 518 states and 682 transitions. [2023-12-02 17:45:44,401 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 25 states, 22 states have (on average 2.3636363636363638) internal successors, (52), 22 states have internal predecessors, (52), 7 states have call successors, (13), 3 states have call predecessors, (13), 3 states have return successors, (12), 5 states have call predecessors, (12), 5 states have call successors, (12) [2023-12-02 17:45:44,401 INFO L276 IsEmpty]: Start isEmpty. Operand 518 states and 682 transitions. [2023-12-02 17:45:44,402 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 51 [2023-12-02 17:45:44,402 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 17:45:44,402 INFO L195 NwaCegarLoop]: trace histogram [5, 4, 4, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-12-02 17:45:44,407 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9baea50c-125b-415c-97d3-07da8d4dc433/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Ended with exit code 0 [2023-12-02 17:45:44,602 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 13 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9baea50c-125b-415c-97d3-07da8d4dc433/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable11 [2023-12-02 17:45:44,603 INFO L420 AbstractCegarLoop]: === Iteration 13 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 17:45:44,603 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 17:45:44,603 INFO L85 PathProgramCache]: Analyzing trace with hash -324758054, now seen corresponding path program 1 times [2023-12-02 17:45:44,603 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 17:45:44,603 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1287487281] [2023-12-02 17:45:44,603 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 17:45:44,604 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 17:45:44,611 ERROR L246 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2023-12-02 17:45:44,611 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1970108712] [2023-12-02 17:45:44,611 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 17:45:44,611 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 17:45:44,611 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9baea50c-125b-415c-97d3-07da8d4dc433/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 17:45:44,612 INFO L229 MonitoredProcess]: Starting monitored process 14 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9baea50c-125b-415c-97d3-07da8d4dc433/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 17:45:44,613 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9baea50c-125b-415c-97d3-07da8d4dc433/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (14)] Waiting until timeout for monitored process [2023-12-02 17:45:44,658 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 17:45:44,660 INFO L262 TraceCheckSpWp]: Trace formula consists of 163 conjuncts, 11 conjunts are in the unsatisfiable core [2023-12-02 17:45:44,662 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 17:45:44,703 INFO L134 CoverageAnalysis]: Checked inductivity of 43 backedges. 10 proven. 10 refuted. 0 times theorem prover too weak. 23 trivial. 0 not checked. [2023-12-02 17:45:44,703 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-12-02 17:45:44,753 INFO L134 CoverageAnalysis]: Checked inductivity of 43 backedges. 10 proven. 10 refuted. 0 times theorem prover too weak. 23 trivial. 0 not checked. [2023-12-02 17:45:44,753 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 17:45:44,753 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1287487281] [2023-12-02 17:45:44,753 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2023-12-02 17:45:44,753 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1970108712] [2023-12-02 17:45:44,753 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1970108712] provided 0 perfect and 2 imperfect interpolant sequences [2023-12-02 17:45:44,753 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1064500836] [2023-12-02 17:45:44,755 INFO L159 IcfgInterpreter]: Started Sifa with 26 locations of interest [2023-12-02 17:45:44,755 INFO L166 IcfgInterpreter]: Building call graph [2023-12-02 17:45:44,755 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-12-02 17:45:44,755 INFO L176 IcfgInterpreter]: Starting interpretation [2023-12-02 17:45:44,756 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-12-02 17:45:45,190 WARN L110 ntervalStateProvider]: Interval conversion did not stabilize in 11 iterations. Over-approximation may be very coarse. [2023-12-02 17:45:47,875 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 9 for LOIs [2023-12-02 17:45:47,879 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 64 for LOIs [2023-12-02 17:45:47,899 INFO L180 IcfgInterpreter]: Interpretation finished [2023-12-02 17:45:50,124 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '8200#(and (<= 1 |#StackHeapBarrier|) (= |__VERIFIER_assert_#in~cond| 0) (= __VERIFIER_assert_~cond 0) (<= ~counter~0 20) (<= 3 ~counter~0))' at error location [2023-12-02 17:45:50,124 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-12-02 17:45:50,124 INFO L185 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2023-12-02 17:45:50,124 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 6] total 9 [2023-12-02 17:45:50,124 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [156250053] [2023-12-02 17:45:50,124 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2023-12-02 17:45:50,125 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 9 states [2023-12-02 17:45:50,125 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 17:45:50,125 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2023-12-02 17:45:50,126 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=118, Invalid=874, Unknown=0, NotChecked=0, Total=992 [2023-12-02 17:45:50,126 INFO L87 Difference]: Start difference. First operand 518 states and 682 transitions. Second operand has 9 states, 9 states have (on average 3.2222222222222223) internal successors, (29), 8 states have internal predecessors, (29), 2 states have call successors, (8), 3 states have call predecessors, (8), 2 states have return successors, (6), 2 states have call predecessors, (6), 2 states have call successors, (6) [2023-12-02 17:45:50,343 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 17:45:50,343 INFO L93 Difference]: Finished difference Result 550 states and 711 transitions. [2023-12-02 17:45:50,343 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2023-12-02 17:45:50,343 INFO L78 Accepts]: Start accepts. Automaton has has 9 states, 9 states have (on average 3.2222222222222223) internal successors, (29), 8 states have internal predecessors, (29), 2 states have call successors, (8), 3 states have call predecessors, (8), 2 states have return successors, (6), 2 states have call predecessors, (6), 2 states have call successors, (6) Word has length 50 [2023-12-02 17:45:50,344 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 17:45:50,347 INFO L225 Difference]: With dead ends: 550 [2023-12-02 17:45:50,347 INFO L226 Difference]: Without dead ends: 548 [2023-12-02 17:45:50,348 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 150 GetRequests, 118 SyntacticMatches, 0 SemanticMatches, 32 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 286 ImplicationChecksByTransitivity, 2.3s TimeCoverageRelationStatistics Valid=134, Invalid=988, Unknown=0, NotChecked=0, Total=1122 [2023-12-02 17:45:50,349 INFO L413 NwaCegarLoop]: 27 mSDtfsCounter, 24 mSDsluCounter, 139 mSDsCounter, 0 mSdLazyCounter, 81 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 24 SdHoareTripleChecker+Valid, 166 SdHoareTripleChecker+Invalid, 83 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 81 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2023-12-02 17:45:50,349 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [24 Valid, 166 Invalid, 83 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 81 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2023-12-02 17:45:50,350 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 548 states. [2023-12-02 17:45:50,491 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 548 to 542. [2023-12-02 17:45:50,492 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 542 states, 399 states have (on average 1.255639097744361) internal successors, (501), 406 states have internal predecessors, (501), 101 states have call successors, (101), 41 states have call predecessors, (101), 41 states have return successors, (98), 94 states have call predecessors, (98), 98 states have call successors, (98) [2023-12-02 17:45:50,495 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 542 states to 542 states and 700 transitions. [2023-12-02 17:45:50,495 INFO L78 Accepts]: Start accepts. Automaton has 542 states and 700 transitions. Word has length 50 [2023-12-02 17:45:50,495 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 17:45:50,495 INFO L495 AbstractCegarLoop]: Abstraction has 542 states and 700 transitions. [2023-12-02 17:45:50,495 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 9 states, 9 states have (on average 3.2222222222222223) internal successors, (29), 8 states have internal predecessors, (29), 2 states have call successors, (8), 3 states have call predecessors, (8), 2 states have return successors, (6), 2 states have call predecessors, (6), 2 states have call successors, (6) [2023-12-02 17:45:50,495 INFO L276 IsEmpty]: Start isEmpty. Operand 542 states and 700 transitions. [2023-12-02 17:45:50,496 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 59 [2023-12-02 17:45:50,496 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 17:45:50,496 INFO L195 NwaCegarLoop]: trace histogram [8, 7, 7, 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] [2023-12-02 17:45:50,501 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9baea50c-125b-415c-97d3-07da8d4dc433/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (14)] Ended with exit code 0 [2023-12-02 17:45:50,697 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 14 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9baea50c-125b-415c-97d3-07da8d4dc433/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable12 [2023-12-02 17:45:50,697 INFO L420 AbstractCegarLoop]: === Iteration 14 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 17:45:50,697 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 17:45:50,697 INFO L85 PathProgramCache]: Analyzing trace with hash -897475049, now seen corresponding path program 2 times [2023-12-02 17:45:50,697 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 17:45:50,698 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [699000638] [2023-12-02 17:45:50,698 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 17:45:50,698 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 17:45:50,705 ERROR L246 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2023-12-02 17:45:50,705 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [710459028] [2023-12-02 17:45:50,705 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2023-12-02 17:45:50,705 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 17:45:50,705 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9baea50c-125b-415c-97d3-07da8d4dc433/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 17:45:50,706 INFO L229 MonitoredProcess]: Starting monitored process 15 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9baea50c-125b-415c-97d3-07da8d4dc433/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 17:45:50,707 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9baea50c-125b-415c-97d3-07da8d4dc433/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (15)] Waiting until timeout for monitored process [2023-12-02 17:45:50,752 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 2 check-sat command(s) [2023-12-02 17:45:50,752 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-12-02 17:45:50,753 INFO L262 TraceCheckSpWp]: Trace formula consists of 117 conjuncts, 21 conjunts are in the unsatisfiable core [2023-12-02 17:45:50,755 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 17:45:50,846 INFO L134 CoverageAnalysis]: Checked inductivity of 106 backedges. 15 proven. 6 refuted. 0 times theorem prover too weak. 85 trivial. 0 not checked. [2023-12-02 17:45:50,846 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-12-02 17:45:50,911 INFO L134 CoverageAnalysis]: Checked inductivity of 106 backedges. 14 proven. 0 refuted. 0 times theorem prover too weak. 92 trivial. 0 not checked. [2023-12-02 17:45:50,912 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 17:45:50,912 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [699000638] [2023-12-02 17:45:50,912 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2023-12-02 17:45:50,912 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [710459028] [2023-12-02 17:45:50,912 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [710459028] provided 1 perfect and 1 imperfect interpolant sequences [2023-12-02 17:45:50,912 INFO L185 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2023-12-02 17:45:50,912 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [9] total 12 [2023-12-02 17:45:50,912 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1631959782] [2023-12-02 17:45:50,912 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-12-02 17:45:50,913 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2023-12-02 17:45:50,913 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 17:45:50,913 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2023-12-02 17:45:50,913 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=27, Invalid=105, Unknown=0, NotChecked=0, Total=132 [2023-12-02 17:45:50,913 INFO L87 Difference]: Start difference. First operand 542 states and 700 transitions. Second operand has 5 states, 5 states have (on average 3.6) internal successors, (18), 4 states have internal predecessors, (18), 2 states have call successors, (7), 2 states have call predecessors, (7), 1 states have return successors, (6), 2 states have call predecessors, (6), 2 states have call successors, (6) [2023-12-02 17:45:51,100 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 17:45:51,101 INFO L93 Difference]: Finished difference Result 576 states and 729 transitions. [2023-12-02 17:45:51,101 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2023-12-02 17:45:51,101 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 3.6) internal successors, (18), 4 states have internal predecessors, (18), 2 states have call successors, (7), 2 states have call predecessors, (7), 1 states have return successors, (6), 2 states have call predecessors, (6), 2 states have call successors, (6) Word has length 58 [2023-12-02 17:45:51,101 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 17:45:51,104 INFO L225 Difference]: With dead ends: 576 [2023-12-02 17:45:51,104 INFO L226 Difference]: Without dead ends: 574 [2023-12-02 17:45:51,105 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 115 GetRequests, 104 SyntacticMatches, 0 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 15 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=31, Invalid=125, Unknown=0, NotChecked=0, Total=156 [2023-12-02 17:45:51,105 INFO L413 NwaCegarLoop]: 33 mSDtfsCounter, 6 mSDsluCounter, 75 mSDsCounter, 0 mSdLazyCounter, 37 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 6 SdHoareTripleChecker+Valid, 108 SdHoareTripleChecker+Invalid, 38 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 37 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2023-12-02 17:45:51,105 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [6 Valid, 108 Invalid, 38 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 37 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2023-12-02 17:45:51,106 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 574 states. [2023-12-02 17:45:51,239 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 574 to 574. [2023-12-02 17:45:51,240 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 574 states, 423 states have (on average 1.2364066193853427) internal successors, (523), 430 states have internal predecessors, (523), 101 states have call successors, (101), 49 states have call predecessors, (101), 49 states have return successors, (98), 94 states have call predecessors, (98), 98 states have call successors, (98) [2023-12-02 17:45:51,243 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 574 states to 574 states and 722 transitions. [2023-12-02 17:45:51,243 INFO L78 Accepts]: Start accepts. Automaton has 574 states and 722 transitions. Word has length 58 [2023-12-02 17:45:51,243 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 17:45:51,243 INFO L495 AbstractCegarLoop]: Abstraction has 574 states and 722 transitions. [2023-12-02 17:45:51,244 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 3.6) internal successors, (18), 4 states have internal predecessors, (18), 2 states have call successors, (7), 2 states have call predecessors, (7), 1 states have return successors, (6), 2 states have call predecessors, (6), 2 states have call successors, (6) [2023-12-02 17:45:51,244 INFO L276 IsEmpty]: Start isEmpty. Operand 574 states and 722 transitions. [2023-12-02 17:45:51,245 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 57 [2023-12-02 17:45:51,245 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 17:45:51,245 INFO L195 NwaCegarLoop]: trace histogram [5, 4, 4, 3, 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 17:45:51,250 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9baea50c-125b-415c-97d3-07da8d4dc433/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (15)] Ended with exit code 0 [2023-12-02 17:45:51,445 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable13,15 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9baea50c-125b-415c-97d3-07da8d4dc433/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 17:45:51,446 INFO L420 AbstractCegarLoop]: === Iteration 15 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 17:45:51,446 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 17:45:51,446 INFO L85 PathProgramCache]: Analyzing trace with hash -1403039201, now seen corresponding path program 1 times [2023-12-02 17:45:51,446 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 17:45:51,446 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [229490329] [2023-12-02 17:45:51,446 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 17:45:51,446 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 17:45:51,453 ERROR L246 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2023-12-02 17:45:51,454 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [248777578] [2023-12-02 17:45:51,454 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 17:45:51,454 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 17:45:51,454 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9baea50c-125b-415c-97d3-07da8d4dc433/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 17:45:51,455 INFO L229 MonitoredProcess]: Starting monitored process 16 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9baea50c-125b-415c-97d3-07da8d4dc433/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 17:45:51,456 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9baea50c-125b-415c-97d3-07da8d4dc433/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (16)] Waiting until timeout for monitored process [2023-12-02 17:45:51,505 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 17:45:51,506 INFO L262 TraceCheckSpWp]: Trace formula consists of 182 conjuncts, 9 conjunts are in the unsatisfiable core [2023-12-02 17:45:51,507 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 17:45:51,553 INFO L134 CoverageAnalysis]: Checked inductivity of 53 backedges. 22 proven. 2 refuted. 0 times theorem prover too weak. 29 trivial. 0 not checked. [2023-12-02 17:45:51,554 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-12-02 17:45:51,606 INFO L134 CoverageAnalysis]: Checked inductivity of 53 backedges. 22 proven. 2 refuted. 0 times theorem prover too weak. 29 trivial. 0 not checked. [2023-12-02 17:45:51,606 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 17:45:51,606 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [229490329] [2023-12-02 17:45:51,606 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2023-12-02 17:45:51,606 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [248777578] [2023-12-02 17:45:51,606 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [248777578] provided 0 perfect and 2 imperfect interpolant sequences [2023-12-02 17:45:51,607 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [995863035] [2023-12-02 17:45:51,609 INFO L159 IcfgInterpreter]: Started Sifa with 27 locations of interest [2023-12-02 17:45:51,609 INFO L166 IcfgInterpreter]: Building call graph [2023-12-02 17:45:51,609 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-12-02 17:45:51,609 INFO L176 IcfgInterpreter]: Starting interpretation [2023-12-02 17:45:51,609 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-12-02 17:46:06,436 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 9 for LOIs [2023-12-02 17:46:06,440 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 64 for LOIs [2023-12-02 17:46:06,459 INFO L180 IcfgInterpreter]: Interpretation finished [2023-12-02 17:46:08,328 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '12075#(and (<= 1 |#StackHeapBarrier|) (= |__VERIFIER_assert_#in~cond| 0) (= __VERIFIER_assert_~cond 0) (<= ~counter~0 20) (<= 3 ~counter~0))' at error location [2023-12-02 17:46:08,328 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-12-02 17:46:08,328 INFO L185 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2023-12-02 17:46:08,328 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 7] total 12 [2023-12-02 17:46:08,329 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1394722210] [2023-12-02 17:46:08,329 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2023-12-02 17:46:08,329 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 12 states [2023-12-02 17:46:08,329 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 17:46:08,330 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2023-12-02 17:46:08,330 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=171, Invalid=1019, Unknown=0, NotChecked=0, Total=1190 [2023-12-02 17:46:08,330 INFO L87 Difference]: Start difference. First operand 574 states and 722 transitions. Second operand has 12 states, 12 states have (on average 4.0) internal successors, (48), 12 states have internal predecessors, (48), 5 states have call successors, (13), 4 states have call predecessors, (13), 3 states have return successors, (12), 4 states have call predecessors, (12), 4 states have call successors, (12) [2023-12-02 17:46:08,638 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 17:46:08,638 INFO L93 Difference]: Finished difference Result 847 states and 1066 transitions. [2023-12-02 17:46:08,639 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2023-12-02 17:46:08,639 INFO L78 Accepts]: Start accepts. Automaton has has 12 states, 12 states have (on average 4.0) internal successors, (48), 12 states have internal predecessors, (48), 5 states have call successors, (13), 4 states have call predecessors, (13), 3 states have return successors, (12), 4 states have call predecessors, (12), 4 states have call successors, (12) Word has length 56 [2023-12-02 17:46:08,639 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 17:46:08,642 INFO L225 Difference]: With dead ends: 847 [2023-12-02 17:46:08,642 INFO L226 Difference]: Without dead ends: 561 [2023-12-02 17:46:08,643 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 171 GetRequests, 133 SyntacticMatches, 0 SemanticMatches, 38 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 539 ImplicationChecksByTransitivity, 1.9s TimeCoverageRelationStatistics Valid=213, Invalid=1347, Unknown=0, NotChecked=0, Total=1560 [2023-12-02 17:46:08,643 INFO L413 NwaCegarLoop]: 34 mSDtfsCounter, 115 mSDsluCounter, 177 mSDsCounter, 0 mSdLazyCounter, 94 mSolverCounterSat, 31 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 115 SdHoareTripleChecker+Valid, 211 SdHoareTripleChecker+Invalid, 125 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 31 IncrementalHoareTripleChecker+Valid, 94 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-12-02 17:46:08,644 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [115 Valid, 211 Invalid, 125 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [31 Valid, 94 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-12-02 17:46:08,645 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 561 states. [2023-12-02 17:46:08,772 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 561 to 552. [2023-12-02 17:46:08,773 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 552 states, 404 states have (on average 1.198019801980198) internal successors, (484), 409 states have internal predecessors, (484), 98 states have call successors, (98), 49 states have call predecessors, (98), 49 states have return successors, (96), 93 states have call predecessors, (96), 96 states have call successors, (96) [2023-12-02 17:46:08,775 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 552 states to 552 states and 678 transitions. [2023-12-02 17:46:08,775 INFO L78 Accepts]: Start accepts. Automaton has 552 states and 678 transitions. Word has length 56 [2023-12-02 17:46:08,775 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 17:46:08,775 INFO L495 AbstractCegarLoop]: Abstraction has 552 states and 678 transitions. [2023-12-02 17:46:08,776 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 12 states, 12 states have (on average 4.0) internal successors, (48), 12 states have internal predecessors, (48), 5 states have call successors, (13), 4 states have call predecessors, (13), 3 states have return successors, (12), 4 states have call predecessors, (12), 4 states have call successors, (12) [2023-12-02 17:46:08,776 INFO L276 IsEmpty]: Start isEmpty. Operand 552 states and 678 transitions. [2023-12-02 17:46:08,776 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 61 [2023-12-02 17:46:08,776 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 17:46:08,776 INFO L195 NwaCegarLoop]: trace histogram [7, 6, 6, 2, 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 17:46:08,782 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9baea50c-125b-415c-97d3-07da8d4dc433/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (16)] Ended with exit code 0 [2023-12-02 17:46:08,977 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 16 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9baea50c-125b-415c-97d3-07da8d4dc433/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable14 [2023-12-02 17:46:08,977 INFO L420 AbstractCegarLoop]: === Iteration 16 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 17:46:08,977 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 17:46:08,977 INFO L85 PathProgramCache]: Analyzing trace with hash 1281872666, now seen corresponding path program 2 times [2023-12-02 17:46:08,977 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 17:46:08,977 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1045389979] [2023-12-02 17:46:08,978 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 17:46:08,978 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 17:46:08,986 ERROR L246 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2023-12-02 17:46:08,987 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [628732458] [2023-12-02 17:46:08,987 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2023-12-02 17:46:08,987 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 17:46:08,987 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9baea50c-125b-415c-97d3-07da8d4dc433/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 17:46:08,988 INFO L229 MonitoredProcess]: Starting monitored process 17 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9baea50c-125b-415c-97d3-07da8d4dc433/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 17:46:08,991 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9baea50c-125b-415c-97d3-07da8d4dc433/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (17)] Waiting until timeout for monitored process [2023-12-02 17:46:09,040 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 2 check-sat command(s) [2023-12-02 17:46:09,041 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-12-02 17:46:09,042 INFO L262 TraceCheckSpWp]: Trace formula consists of 145 conjuncts, 18 conjunts are in the unsatisfiable core [2023-12-02 17:46:09,043 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 17:46:09,156 INFO L134 CoverageAnalysis]: Checked inductivity of 85 backedges. 12 proven. 7 refuted. 0 times theorem prover too weak. 66 trivial. 0 not checked. [2023-12-02 17:46:09,156 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-12-02 17:46:09,222 INFO L134 CoverageAnalysis]: Checked inductivity of 85 backedges. 15 proven. 0 refuted. 0 times theorem prover too weak. 70 trivial. 0 not checked. [2023-12-02 17:46:09,222 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 17:46:09,222 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1045389979] [2023-12-02 17:46:09,222 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2023-12-02 17:46:09,222 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [628732458] [2023-12-02 17:46:09,222 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [628732458] provided 1 perfect and 1 imperfect interpolant sequences [2023-12-02 17:46:09,222 INFO L185 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2023-12-02 17:46:09,223 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [10] total 13 [2023-12-02 17:46:09,223 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1048893946] [2023-12-02 17:46:09,223 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-12-02 17:46:09,223 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2023-12-02 17:46:09,223 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 17:46:09,224 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2023-12-02 17:46:09,224 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=27, Invalid=129, Unknown=0, NotChecked=0, Total=156 [2023-12-02 17:46:09,224 INFO L87 Difference]: Start difference. First operand 552 states and 678 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, (7), 2 states have call predecessors, (7), 1 states have return successors, (6), 2 states have call predecessors, (6), 2 states have call successors, (6) [2023-12-02 17:46:09,435 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 17:46:09,435 INFO L93 Difference]: Finished difference Result 631 states and 779 transitions. [2023-12-02 17:46:09,436 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2023-12-02 17:46:09,436 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, (7), 2 states have call predecessors, (7), 1 states have return successors, (6), 2 states have call predecessors, (6), 2 states have call successors, (6) Word has length 60 [2023-12-02 17:46:09,436 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 17:46:09,439 INFO L225 Difference]: With dead ends: 631 [2023-12-02 17:46:09,440 INFO L226 Difference]: Without dead ends: 629 [2023-12-02 17:46:09,440 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 119 GetRequests, 107 SyntacticMatches, 0 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 9 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=31, Invalid=151, Unknown=0, NotChecked=0, Total=182 [2023-12-02 17:46:09,441 INFO L413 NwaCegarLoop]: 31 mSDtfsCounter, 8 mSDsluCounter, 78 mSDsCounter, 0 mSdLazyCounter, 49 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 8 SdHoareTripleChecker+Valid, 109 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 17:46:09,441 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [8 Valid, 109 Invalid, 50 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 49 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2023-12-02 17:46:09,442 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 629 states. [2023-12-02 17:46:09,630 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 629 to 619. [2023-12-02 17:46:09,631 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 619 states, 445 states have (on average 1.2) internal successors, (534), 451 states have internal predecessors, (534), 116 states have call successors, (116), 57 states have call predecessors, (116), 57 states have return successors, (114), 110 states have call predecessors, (114), 114 states have call successors, (114) [2023-12-02 17:46:09,633 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 619 states to 619 states and 764 transitions. [2023-12-02 17:46:09,634 INFO L78 Accepts]: Start accepts. Automaton has 619 states and 764 transitions. Word has length 60 [2023-12-02 17:46:09,634 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 17:46:09,634 INFO L495 AbstractCegarLoop]: Abstraction has 619 states and 764 transitions. [2023-12-02 17:46:09,634 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, (7), 2 states have call predecessors, (7), 1 states have return successors, (6), 2 states have call predecessors, (6), 2 states have call successors, (6) [2023-12-02 17:46:09,634 INFO L276 IsEmpty]: Start isEmpty. Operand 619 states and 764 transitions. [2023-12-02 17:46:09,635 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 62 [2023-12-02 17:46:09,635 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 17:46:09,635 INFO L195 NwaCegarLoop]: trace histogram [5, 4, 4, 4, 4, 3, 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] [2023-12-02 17:46:09,640 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9baea50c-125b-415c-97d3-07da8d4dc433/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (17)] Ended with exit code 0 [2023-12-02 17:46:09,835 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 17 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9baea50c-125b-415c-97d3-07da8d4dc433/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable15 [2023-12-02 17:46:09,836 INFO L420 AbstractCegarLoop]: === Iteration 17 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 17:46:09,836 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 17:46:09,836 INFO L85 PathProgramCache]: Analyzing trace with hash 186118403, now seen corresponding path program 1 times [2023-12-02 17:46:09,836 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 17:46:09,836 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [113220458] [2023-12-02 17:46:09,836 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 17:46:09,837 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 17:46:09,845 ERROR L246 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2023-12-02 17:46:09,845 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [676553886] [2023-12-02 17:46:09,845 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 17:46:09,845 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 17:46:09,845 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9baea50c-125b-415c-97d3-07da8d4dc433/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 17:46:09,846 INFO L229 MonitoredProcess]: Starting monitored process 18 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9baea50c-125b-415c-97d3-07da8d4dc433/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 17:46:09,847 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9baea50c-125b-415c-97d3-07da8d4dc433/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (18)] Waiting until timeout for monitored process [2023-12-02 17:46:09,901 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 17:46:09,902 INFO L262 TraceCheckSpWp]: Trace formula consists of 201 conjuncts, 31 conjunts are in the unsatisfiable core [2023-12-02 17:46:09,904 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 17:46:10,590 INFO L134 CoverageAnalysis]: Checked inductivity of 65 backedges. 10 proven. 39 refuted. 0 times theorem prover too weak. 16 trivial. 0 not checked. [2023-12-02 17:46:10,590 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-12-02 17:46:10,986 INFO L134 CoverageAnalysis]: Checked inductivity of 65 backedges. 32 proven. 10 refuted. 0 times theorem prover too weak. 23 trivial. 0 not checked. [2023-12-02 17:46:10,986 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 17:46:10,986 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [113220458] [2023-12-02 17:46:10,986 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2023-12-02 17:46:10,986 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [676553886] [2023-12-02 17:46:10,987 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [676553886] provided 0 perfect and 2 imperfect interpolant sequences [2023-12-02 17:46:10,987 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [823565322] [2023-12-02 17:46:10,988 INFO L159 IcfgInterpreter]: Started Sifa with 27 locations of interest [2023-12-02 17:46:10,989 INFO L166 IcfgInterpreter]: Building call graph [2023-12-02 17:46:10,989 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-12-02 17:46:10,989 INFO L176 IcfgInterpreter]: Starting interpretation [2023-12-02 17:46:10,989 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-12-02 17:46:14,610 WARN L110 ntervalStateProvider]: Interval conversion did not stabilize in 10 iterations. Over-approximation may be very coarse. [2023-12-02 17:46:14,610 WARN L110 ntervalStateProvider]: Interval conversion did not stabilize in 10 iterations. Over-approximation may be very coarse. [2023-12-02 17:46:14,955 WARN L110 ntervalStateProvider]: Interval conversion did not stabilize in 11 iterations. Over-approximation may be very coarse. [2023-12-02 17:46:14,955 WARN L110 ntervalStateProvider]: Interval conversion did not stabilize in 11 iterations. Over-approximation may be very coarse. [2023-12-02 17:46:15,004 WARN L110 ntervalStateProvider]: Interval conversion did not stabilize in 11 iterations. Over-approximation may be very coarse. [2023-12-02 17:46:15,005 WARN L110 ntervalStateProvider]: Interval conversion did not stabilize in 11 iterations. Over-approximation may be very coarse. [2023-12-02 17:46:16,388 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 42 for LOIs [2023-12-02 17:46:16,420 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 64 for LOIs [2023-12-02 17:46:16,448 INFO L180 IcfgInterpreter]: Interpretation finished [2023-12-02 17:46:20,530 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '16575#(and (<= 1 |#StackHeapBarrier|) (= |__VERIFIER_assert_#in~cond| 0) (= __VERIFIER_assert_~cond 0) (<= ~counter~0 20) (<= 3 ~counter~0))' at error location [2023-12-02 17:46:20,530 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-12-02 17:46:20,530 INFO L185 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2023-12-02 17:46:20,530 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 8] total 22 [2023-12-02 17:46:20,530 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [355025718] [2023-12-02 17:46:20,530 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2023-12-02 17:46:20,531 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 22 states [2023-12-02 17:46:20,531 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 17:46:20,532 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2023-12-02 17:46:20,533 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=213, Invalid=1767, Unknown=0, NotChecked=0, Total=1980 [2023-12-02 17:46:20,533 INFO L87 Difference]: Start difference. First operand 619 states and 764 transitions. Second operand has 22 states, 21 states have (on average 3.380952380952381) internal successors, (71), 18 states have internal predecessors, (71), 7 states have call successors, (13), 3 states have call predecessors, (13), 3 states have return successors, (12), 5 states have call predecessors, (12), 5 states have call successors, (12) [2023-12-02 17:47:30,351 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 17:47:34,081 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 17:47:34,081 INFO L93 Difference]: Finished difference Result 1017 states and 1341 transitions. [2023-12-02 17:47:34,081 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 51 states. [2023-12-02 17:47:34,082 INFO L78 Accepts]: Start accepts. Automaton has has 22 states, 21 states have (on average 3.380952380952381) internal successors, (71), 18 states have internal predecessors, (71), 7 states have call successors, (13), 3 states have call predecessors, (13), 3 states have return successors, (12), 5 states have call predecessors, (12), 5 states have call successors, (12) Word has length 61 [2023-12-02 17:47:34,082 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 17:47:34,085 INFO L225 Difference]: With dead ends: 1017 [2023-12-02 17:47:34,086 INFO L226 Difference]: Without dead ends: 873 [2023-12-02 17:47:34,088 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 248 GetRequests, 161 SyntacticMatches, 0 SemanticMatches, 87 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2167 ImplicationChecksByTransitivity, 59.2s TimeCoverageRelationStatistics Valid=957, Invalid=6874, Unknown=1, NotChecked=0, Total=7832 [2023-12-02 17:47:34,089 INFO L413 NwaCegarLoop]: 82 mSDtfsCounter, 307 mSDsluCounter, 813 mSDsCounter, 0 mSdLazyCounter, 902 mSolverCounterSat, 135 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 18.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 310 SdHoareTripleChecker+Valid, 895 SdHoareTripleChecker+Invalid, 1037 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 135 IncrementalHoareTripleChecker+Valid, 902 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 18.5s IncrementalHoareTripleChecker+Time [2023-12-02 17:47:34,089 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [310 Valid, 895 Invalid, 1037 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [135 Valid, 902 Invalid, 0 Unknown, 0 Unchecked, 18.5s Time] [2023-12-02 17:47:34,090 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 873 states. [2023-12-02 17:47:34,304 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 873 to 678. [2023-12-02 17:47:34,306 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 678 states, 497 states have (on average 1.2374245472837022) internal successors, (615), 508 states have internal predecessors, (615), 125 states have call successors, (125), 55 states have call predecessors, (125), 55 states have return successors, (123), 114 states have call predecessors, (123), 123 states have call successors, (123) [2023-12-02 17:47:34,308 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 678 states to 678 states and 863 transitions. [2023-12-02 17:47:34,308 INFO L78 Accepts]: Start accepts. Automaton has 678 states and 863 transitions. Word has length 61 [2023-12-02 17:47:34,309 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 17:47:34,309 INFO L495 AbstractCegarLoop]: Abstraction has 678 states and 863 transitions. [2023-12-02 17:47:34,309 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 22 states, 21 states have (on average 3.380952380952381) internal successors, (71), 18 states have internal predecessors, (71), 7 states have call successors, (13), 3 states have call predecessors, (13), 3 states have return successors, (12), 5 states have call predecessors, (12), 5 states have call successors, (12) [2023-12-02 17:47:34,309 INFO L276 IsEmpty]: Start isEmpty. Operand 678 states and 863 transitions. [2023-12-02 17:47:34,310 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 62 [2023-12-02 17:47:34,310 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 17:47:34,310 INFO L195 NwaCegarLoop]: trace histogram [5, 4, 4, 4, 4, 3, 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] [2023-12-02 17:47:34,315 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9baea50c-125b-415c-97d3-07da8d4dc433/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (18)] Ended with exit code 0 [2023-12-02 17:47:34,510 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 18 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9baea50c-125b-415c-97d3-07da8d4dc433/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable16 [2023-12-02 17:47:34,510 INFO L420 AbstractCegarLoop]: === Iteration 18 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 17:47:34,511 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 17:47:34,511 INFO L85 PathProgramCache]: Analyzing trace with hash 1039137595, now seen corresponding path program 2 times [2023-12-02 17:47:34,511 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 17:47:34,511 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [249208092] [2023-12-02 17:47:34,511 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 17:47:34,511 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 17:47:34,519 ERROR L246 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2023-12-02 17:47:34,519 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [2113250268] [2023-12-02 17:47:34,519 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2023-12-02 17:47:34,519 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 17:47:34,519 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9baea50c-125b-415c-97d3-07da8d4dc433/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 17:47:34,520 INFO L229 MonitoredProcess]: Starting monitored process 19 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9baea50c-125b-415c-97d3-07da8d4dc433/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 17:47:34,521 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9baea50c-125b-415c-97d3-07da8d4dc433/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (19)] Waiting until timeout for monitored process [2023-12-02 17:47:34,575 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2023-12-02 17:47:34,576 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-12-02 17:47:34,577 INFO L262 TraceCheckSpWp]: Trace formula consists of 145 conjuncts, 5 conjunts are in the unsatisfiable core [2023-12-02 17:47:34,578 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 17:47:34,599 INFO L134 CoverageAnalysis]: Checked inductivity of 65 backedges. 36 proven. 0 refuted. 0 times theorem prover too weak. 29 trivial. 0 not checked. [2023-12-02 17:47:34,600 INFO L323 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2023-12-02 17:47:34,600 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 17:47:34,600 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [249208092] [2023-12-02 17:47:34,600 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2023-12-02 17:47:34,600 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2113250268] [2023-12-02 17:47:34,600 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2113250268] provided 1 perfect and 0 imperfect interpolant sequences [2023-12-02 17:47:34,600 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-12-02 17:47:34,600 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2023-12-02 17:47:34,601 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1884890253] [2023-12-02 17:47:34,601 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-12-02 17:47:34,601 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2023-12-02 17:47:34,601 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 17:47:34,602 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2023-12-02 17:47:34,602 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2023-12-02 17:47:34,602 INFO L87 Difference]: Start difference. First operand 678 states and 863 transitions. Second operand has 5 states, 5 states have (on average 7.2) internal successors, (36), 5 states have internal predecessors, (36), 2 states have call successors, (7), 2 states have call predecessors, (7), 1 states have return successors, (6), 1 states have call predecessors, (6), 1 states have call successors, (6) [2023-12-02 17:47:34,911 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 17:47:34,911 INFO L93 Difference]: Finished difference Result 890 states and 1162 transitions. [2023-12-02 17:47:34,912 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2023-12-02 17:47:34,912 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 7.2) internal successors, (36), 5 states have internal predecessors, (36), 2 states have call successors, (7), 2 states have call predecessors, (7), 1 states have return successors, (6), 1 states have call predecessors, (6), 1 states have call successors, (6) Word has length 61 [2023-12-02 17:47:34,912 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 17:47:34,915 INFO L225 Difference]: With dead ends: 890 [2023-12-02 17:47:34,915 INFO L226 Difference]: Without dead ends: 772 [2023-12-02 17:47:34,916 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 63 GetRequests, 58 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 17:47:34,917 INFO L413 NwaCegarLoop]: 52 mSDtfsCounter, 30 mSDsluCounter, 114 mSDsCounter, 0 mSdLazyCounter, 66 mSolverCounterSat, 8 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 34 SdHoareTripleChecker+Valid, 166 SdHoareTripleChecker+Invalid, 74 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 8 IncrementalHoareTripleChecker+Valid, 66 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-12-02 17:47:34,917 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [34 Valid, 166 Invalid, 74 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [8 Valid, 66 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-12-02 17:47:34,918 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 772 states. [2023-12-02 17:47:35,169 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 772 to 644. [2023-12-02 17:47:35,170 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 644 states, 478 states have (on average 1.211297071129707) internal successors, (579), 484 states have internal predecessors, (579), 110 states have call successors, (110), 55 states have call predecessors, (110), 55 states have return successors, (108), 104 states have call predecessors, (108), 108 states have call successors, (108) [2023-12-02 17:47:35,173 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 644 states to 644 states and 797 transitions. [2023-12-02 17:47:35,174 INFO L78 Accepts]: Start accepts. Automaton has 644 states and 797 transitions. Word has length 61 [2023-12-02 17:47:35,174 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 17:47:35,174 INFO L495 AbstractCegarLoop]: Abstraction has 644 states and 797 transitions. [2023-12-02 17:47:35,174 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 7.2) internal successors, (36), 5 states have internal predecessors, (36), 2 states have call successors, (7), 2 states have call predecessors, (7), 1 states have return successors, (6), 1 states have call predecessors, (6), 1 states have call successors, (6) [2023-12-02 17:47:35,174 INFO L276 IsEmpty]: Start isEmpty. Operand 644 states and 797 transitions. [2023-12-02 17:47:35,175 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 65 [2023-12-02 17:47:35,175 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 17:47:35,176 INFO L195 NwaCegarLoop]: trace histogram [7, 6, 6, 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 17:47:35,181 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9baea50c-125b-415c-97d3-07da8d4dc433/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (19)] Ended with exit code 0 [2023-12-02 17:47:35,376 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 19 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9baea50c-125b-415c-97d3-07da8d4dc433/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable17 [2023-12-02 17:47:35,376 INFO L420 AbstractCegarLoop]: === Iteration 19 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 17:47:35,376 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 17:47:35,377 INFO L85 PathProgramCache]: Analyzing trace with hash 1945599548, now seen corresponding path program 3 times [2023-12-02 17:47:35,377 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 17:47:35,377 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1714834555] [2023-12-02 17:47:35,377 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 17:47:35,377 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 17:47:35,383 ERROR L246 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2023-12-02 17:47:35,383 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [528308305] [2023-12-02 17:47:35,383 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2023-12-02 17:47:35,384 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 17:47:35,384 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9baea50c-125b-415c-97d3-07da8d4dc433/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 17:47:35,384 INFO L229 MonitoredProcess]: Starting monitored process 20 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9baea50c-125b-415c-97d3-07da8d4dc433/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 17:47:35,387 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9baea50c-125b-415c-97d3-07da8d4dc433/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (20)] Waiting until timeout for monitored process [2023-12-02 17:47:35,433 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2023-12-02 17:47:35,433 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-12-02 17:47:35,434 INFO L262 TraceCheckSpWp]: Trace formula consists of 159 conjuncts, 4 conjunts are in the unsatisfiable core [2023-12-02 17:47:35,435 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 17:47:35,459 INFO L134 CoverageAnalysis]: Checked inductivity of 91 backedges. 51 proven. 0 refuted. 0 times theorem prover too weak. 40 trivial. 0 not checked. [2023-12-02 17:47:35,460 INFO L323 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2023-12-02 17:47:35,460 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 17:47:35,460 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1714834555] [2023-12-02 17:47:35,460 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2023-12-02 17:47:35,460 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [528308305] [2023-12-02 17:47:35,460 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [528308305] provided 1 perfect and 0 imperfect interpolant sequences [2023-12-02 17:47:35,460 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-12-02 17:47:35,460 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2023-12-02 17:47:35,460 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1909473512] [2023-12-02 17:47:35,460 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-12-02 17:47:35,461 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2023-12-02 17:47:35,461 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 17:47:35,461 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2023-12-02 17:47:35,461 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2023-12-02 17:47:35,462 INFO L87 Difference]: Start difference. First operand 644 states and 797 transitions. Second operand has 5 states, 5 states have (on average 5.6) internal successors, (28), 5 states have internal predecessors, (28), 3 states have call successors, (9), 2 states have call predecessors, (9), 2 states have return successors, (8), 3 states have call predecessors, (8), 3 states have call successors, (8) [2023-12-02 17:47:35,723 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 17:47:35,723 INFO L93 Difference]: Finished difference Result 951 states and 1217 transitions. [2023-12-02 17:47:35,723 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2023-12-02 17:47:35,723 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 5.6) internal successors, (28), 5 states have internal predecessors, (28), 3 states have call successors, (9), 2 states have call predecessors, (9), 2 states have return successors, (8), 3 states have call predecessors, (8), 3 states have call successors, (8) Word has length 64 [2023-12-02 17:47:35,724 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 17:47:35,727 INFO L225 Difference]: With dead ends: 951 [2023-12-02 17:47:35,728 INFO L226 Difference]: Without dead ends: 705 [2023-12-02 17:47:35,728 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 17:47:35,729 INFO L413 NwaCegarLoop]: 35 mSDtfsCounter, 2 mSDsluCounter, 56 mSDsCounter, 0 mSdLazyCounter, 37 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 2 SdHoareTripleChecker+Valid, 91 SdHoareTripleChecker+Invalid, 38 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 37 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2023-12-02 17:47:35,729 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [2 Valid, 91 Invalid, 38 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 37 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2023-12-02 17:47:35,730 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 705 states. [2023-12-02 17:47:36,036 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 705 to 694. [2023-12-02 17:47:36,038 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 694 states, 510 states have (on average 1.2117647058823529) internal successors, (618), 515 states have internal predecessors, (618), 128 states have call successors, (128), 55 states have call predecessors, (128), 55 states have return successors, (126), 123 states have call predecessors, (126), 126 states have call successors, (126) [2023-12-02 17:47:36,041 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 694 states to 694 states and 872 transitions. [2023-12-02 17:47:36,041 INFO L78 Accepts]: Start accepts. Automaton has 694 states and 872 transitions. Word has length 64 [2023-12-02 17:47:36,042 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 17:47:36,042 INFO L495 AbstractCegarLoop]: Abstraction has 694 states and 872 transitions. [2023-12-02 17:47:36,042 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 5.6) internal successors, (28), 5 states have internal predecessors, (28), 3 states have call successors, (9), 2 states have call predecessors, (9), 2 states have return successors, (8), 3 states have call predecessors, (8), 3 states have call successors, (8) [2023-12-02 17:47:36,042 INFO L276 IsEmpty]: Start isEmpty. Operand 694 states and 872 transitions. [2023-12-02 17:47:36,043 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 67 [2023-12-02 17:47:36,043 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 17:47:36,043 INFO L195 NwaCegarLoop]: trace histogram [6, 5, 5, 4, 4, 3, 3, 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] [2023-12-02 17:47:36,050 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9baea50c-125b-415c-97d3-07da8d4dc433/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (20)] Forceful destruction successful, exit code 0 [2023-12-02 17:47:36,244 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable18,20 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9baea50c-125b-415c-97d3-07da8d4dc433/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 17:47:36,244 INFO L420 AbstractCegarLoop]: === Iteration 20 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 17:47:36,244 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 17:47:36,245 INFO L85 PathProgramCache]: Analyzing trace with hash -1497093235, now seen corresponding path program 4 times [2023-12-02 17:47:36,245 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 17:47:36,245 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [783770803] [2023-12-02 17:47:36,245 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 17:47:36,245 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 17:47:36,253 ERROR L246 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2023-12-02 17:47:36,253 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1688790389] [2023-12-02 17:47:36,253 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2023-12-02 17:47:36,254 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 17:47:36,254 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9baea50c-125b-415c-97d3-07da8d4dc433/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 17:47:36,255 INFO L229 MonitoredProcess]: Starting monitored process 21 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9baea50c-125b-415c-97d3-07da8d4dc433/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 17:47:36,256 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9baea50c-125b-415c-97d3-07da8d4dc433/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (21)] Waiting until timeout for monitored process [2023-12-02 17:47:36,321 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 17:47:36,323 INFO L262 TraceCheckSpWp]: Trace formula consists of 210 conjuncts, 59 conjunts are in the unsatisfiable core [2023-12-02 17:47:36,326 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 17:47:37,134 INFO L134 CoverageAnalysis]: Checked inductivity of 84 backedges. 10 proven. 33 refuted. 0 times theorem prover too weak. 41 trivial. 0 not checked. [2023-12-02 17:47:37,135 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-12-02 17:47:38,440 INFO L134 CoverageAnalysis]: Checked inductivity of 84 backedges. 16 proven. 26 refuted. 0 times theorem prover too weak. 42 trivial. 0 not checked. [2023-12-02 17:47:38,440 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 17:47:38,440 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [783770803] [2023-12-02 17:47:38,440 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2023-12-02 17:47:38,440 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1688790389] [2023-12-02 17:47:38,440 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1688790389] provided 0 perfect and 2 imperfect interpolant sequences [2023-12-02 17:47:38,440 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [916977557] [2023-12-02 17:47:38,442 INFO L159 IcfgInterpreter]: Started Sifa with 27 locations of interest [2023-12-02 17:47:38,442 INFO L166 IcfgInterpreter]: Building call graph [2023-12-02 17:47:38,442 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-12-02 17:47:38,443 INFO L176 IcfgInterpreter]: Starting interpretation [2023-12-02 17:47:38,443 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-12-02 17:47:41,599 WARN L110 ntervalStateProvider]: Interval conversion did not stabilize in 10 iterations. Over-approximation may be very coarse. [2023-12-02 17:47:41,599 WARN L110 ntervalStateProvider]: Interval conversion did not stabilize in 10 iterations. Over-approximation may be very coarse. [2023-12-02 17:47:41,943 WARN L110 ntervalStateProvider]: Interval conversion did not stabilize in 11 iterations. Over-approximation may be very coarse. [2023-12-02 17:47:41,943 WARN L110 ntervalStateProvider]: Interval conversion did not stabilize in 11 iterations. Over-approximation may be very coarse. [2023-12-02 17:47:41,986 WARN L110 ntervalStateProvider]: Interval conversion did not stabilize in 11 iterations. Over-approximation may be very coarse. [2023-12-02 17:47:41,987 WARN L110 ntervalStateProvider]: Interval conversion did not stabilize in 11 iterations. Over-approximation may be very coarse. [2023-12-02 17:47:43,291 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 42 for LOIs [2023-12-02 17:47:43,323 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 64 for LOIs [2023-12-02 17:47:43,343 INFO L180 IcfgInterpreter]: Interpretation finished [2023-12-02 17:47:52,359 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '24385#(and (<= 1 |#StackHeapBarrier|) (= |__VERIFIER_assert_#in~cond| 0) (= __VERIFIER_assert_~cond 0) (<= ~counter~0 20) (<= 3 ~counter~0))' at error location [2023-12-02 17:47:52,359 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-12-02 17:47:52,359 INFO L185 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2023-12-02 17:47:52,359 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 13] total 26 [2023-12-02 17:47:52,359 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [283888594] [2023-12-02 17:47:52,359 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2023-12-02 17:47:52,360 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 26 states [2023-12-02 17:47:52,360 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 17:47:52,360 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2023-12-02 17:47:52,361 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=253, Invalid=2099, Unknown=0, NotChecked=0, Total=2352 [2023-12-02 17:47:52,361 INFO L87 Difference]: Start difference. First operand 694 states and 872 transitions. Second operand has 26 states, 25 states have (on average 2.84) internal successors, (71), 23 states have internal predecessors, (71), 6 states have call successors, (15), 3 states have call predecessors, (15), 2 states have return successors, (14), 6 states have call predecessors, (14), 6 states have call successors, (14) [2023-12-02 17:48:16,102 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 17:48:16,102 INFO L93 Difference]: Finished difference Result 1128 states and 1519 transitions. [2023-12-02 17:48:16,102 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 47 states. [2023-12-02 17:48:16,103 INFO L78 Accepts]: Start accepts. Automaton has has 26 states, 25 states have (on average 2.84) internal successors, (71), 23 states have internal predecessors, (71), 6 states have call successors, (15), 3 states have call predecessors, (15), 2 states have return successors, (14), 6 states have call predecessors, (14), 6 states have call successors, (14) Word has length 66 [2023-12-02 17:48:16,103 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 17:48:16,107 INFO L225 Difference]: With dead ends: 1128 [2023-12-02 17:48:16,107 INFO L226 Difference]: Without dead ends: 1124 [2023-12-02 17:48:16,110 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 235 GetRequests, 149 SyntacticMatches, 0 SemanticMatches, 86 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2308 ImplicationChecksByTransitivity, 25.8s TimeCoverageRelationStatistics Valid=1116, Invalid=6540, Unknown=0, NotChecked=0, Total=7656 [2023-12-02 17:48:16,110 INFO L413 NwaCegarLoop]: 58 mSDtfsCounter, 423 mSDsluCounter, 703 mSDsCounter, 0 mSdLazyCounter, 634 mSolverCounterSat, 273 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 7.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 423 SdHoareTripleChecker+Valid, 761 SdHoareTripleChecker+Invalid, 907 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 273 IncrementalHoareTripleChecker+Valid, 634 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 7.4s IncrementalHoareTripleChecker+Time [2023-12-02 17:48:16,110 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [423 Valid, 761 Invalid, 907 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [273 Valid, 634 Invalid, 0 Unknown, 0 Unchecked, 7.4s Time] [2023-12-02 17:48:16,112 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1124 states. [2023-12-02 17:48:16,571 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1124 to 904. [2023-12-02 17:48:16,573 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 904 states, 669 states have (on average 1.2481315396113601) internal successors, (835), 674 states have internal predecessors, (835), 170 states have call successors, (170), 65 states have call predecessors, (170), 64 states have return successors, (168), 164 states have call predecessors, (168), 168 states have call successors, (168) [2023-12-02 17:48:16,578 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 904 states to 904 states and 1173 transitions. [2023-12-02 17:48:16,578 INFO L78 Accepts]: Start accepts. Automaton has 904 states and 1173 transitions. Word has length 66 [2023-12-02 17:48:16,578 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 17:48:16,578 INFO L495 AbstractCegarLoop]: Abstraction has 904 states and 1173 transitions. [2023-12-02 17:48:16,579 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 26 states, 25 states have (on average 2.84) internal successors, (71), 23 states have internal predecessors, (71), 6 states have call successors, (15), 3 states have call predecessors, (15), 2 states have return successors, (14), 6 states have call predecessors, (14), 6 states have call successors, (14) [2023-12-02 17:48:16,579 INFO L276 IsEmpty]: Start isEmpty. Operand 904 states and 1173 transitions. [2023-12-02 17:48:16,580 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 68 [2023-12-02 17:48:16,580 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 17:48:16,580 INFO L195 NwaCegarLoop]: trace histogram [5, 5, 4, 4, 4, 4, 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, 1, 1, 1, 1] [2023-12-02 17:48:16,586 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9baea50c-125b-415c-97d3-07da8d4dc433/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (21)] Ended with exit code 0 [2023-12-02 17:48:16,781 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable19,21 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9baea50c-125b-415c-97d3-07da8d4dc433/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 17:48:16,781 INFO L420 AbstractCegarLoop]: === Iteration 21 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 17:48:16,781 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 17:48:16,781 INFO L85 PathProgramCache]: Analyzing trace with hash 1282659453, now seen corresponding path program 1 times [2023-12-02 17:48:16,782 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 17:48:16,782 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1116172372] [2023-12-02 17:48:16,782 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 17:48:16,782 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 17:48:16,791 ERROR L246 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2023-12-02 17:48:16,791 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1650903658] [2023-12-02 17:48:16,792 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 17:48:16,792 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 17:48:16,792 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9baea50c-125b-415c-97d3-07da8d4dc433/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 17:48:16,793 INFO L229 MonitoredProcess]: Starting monitored process 22 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9baea50c-125b-415c-97d3-07da8d4dc433/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 17:48:16,794 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9baea50c-125b-415c-97d3-07da8d4dc433/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (22)] Waiting until timeout for monitored process [2023-12-02 17:48:16,859 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 17:48:16,861 INFO L262 TraceCheckSpWp]: Trace formula consists of 227 conjuncts, 19 conjunts are in the unsatisfiable core [2023-12-02 17:48:16,863 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 17:48:16,946 INFO L134 CoverageAnalysis]: Checked inductivity of 81 backedges. 25 proven. 30 refuted. 0 times theorem prover too weak. 26 trivial. 0 not checked. [2023-12-02 17:48:16,946 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-12-02 17:48:17,081 INFO L134 CoverageAnalysis]: Checked inductivity of 81 backedges. 25 proven. 30 refuted. 0 times theorem prover too weak. 26 trivial. 0 not checked. [2023-12-02 17:48:17,081 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 17:48:17,081 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1116172372] [2023-12-02 17:48:17,081 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2023-12-02 17:48:17,082 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1650903658] [2023-12-02 17:48:17,082 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1650903658] provided 0 perfect and 2 imperfect interpolant sequences [2023-12-02 17:48:17,082 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1943736977] [2023-12-02 17:48:17,083 INFO L159 IcfgInterpreter]: Started Sifa with 28 locations of interest [2023-12-02 17:48:17,083 INFO L166 IcfgInterpreter]: Building call graph [2023-12-02 17:48:17,084 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-12-02 17:48:17,084 INFO L176 IcfgInterpreter]: Starting interpretation [2023-12-02 17:48:17,084 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-12-02 17:48:23,015 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 1 for LOIs [2023-12-02 17:48:23,017 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 64 for LOIs [2023-12-02 17:48:23,037 INFO L180 IcfgInterpreter]: Interpretation finished [2023-12-02 17:48:23,920 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '27793#(and (= |__VERIFIER_assert_#in~cond| 0) (= __VERIFIER_assert_~cond 0))' at error location [2023-12-02 17:48:23,920 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-12-02 17:48:23,920 INFO L185 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2023-12-02 17:48:23,920 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 12] total 22 [2023-12-02 17:48:23,920 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1337646477] [2023-12-02 17:48:23,920 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2023-12-02 17:48:23,921 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 22 states [2023-12-02 17:48:23,921 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 17:48:23,921 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2023-12-02 17:48:23,922 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=363, Invalid=1277, Unknown=0, NotChecked=0, Total=1640 [2023-12-02 17:48:23,922 INFO L87 Difference]: Start difference. First operand 904 states and 1173 transitions. Second operand has 22 states, 22 states have (on average 3.590909090909091) internal successors, (79), 22 states have internal predecessors, (79), 5 states have call successors, (13), 4 states have call predecessors, (13), 3 states have return successors, (12), 4 states have call predecessors, (12), 4 states have call successors, (12) [2023-12-02 17:48:26,258 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 17:48:26,258 INFO L93 Difference]: Finished difference Result 4084 states and 5769 transitions. [2023-12-02 17:48:26,259 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 36 states. [2023-12-02 17:48:26,259 INFO L78 Accepts]: Start accepts. Automaton has has 22 states, 22 states have (on average 3.590909090909091) internal successors, (79), 22 states have internal predecessors, (79), 5 states have call successors, (13), 4 states have call predecessors, (13), 3 states have return successors, (12), 4 states have call predecessors, (12), 4 states have call successors, (12) Word has length 67 [2023-12-02 17:48:26,259 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 17:48:26,274 INFO L225 Difference]: With dead ends: 4084 [2023-12-02 17:48:26,275 INFO L226 Difference]: Without dead ends: 3713 [2023-12-02 17:48:26,277 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 214 GetRequests, 160 SyntacticMatches, 0 SemanticMatches, 54 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 960 ImplicationChecksByTransitivity, 1.2s TimeCoverageRelationStatistics Valid=655, Invalid=2425, Unknown=0, NotChecked=0, Total=3080 [2023-12-02 17:48:26,278 INFO L413 NwaCegarLoop]: 32 mSDtfsCounter, 486 mSDsluCounter, 314 mSDsCounter, 0 mSdLazyCounter, 241 mSolverCounterSat, 128 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 486 SdHoareTripleChecker+Valid, 346 SdHoareTripleChecker+Invalid, 369 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 128 IncrementalHoareTripleChecker+Valid, 241 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2023-12-02 17:48:26,278 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [486 Valid, 346 Invalid, 369 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [128 Valid, 241 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2023-12-02 17:48:26,281 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 3713 states. [2023-12-02 17:48:28,083 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 3713 to 3576. [2023-12-02 17:48:28,087 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 3576 states, 2622 states have (on average 1.2982456140350878) internal successors, (3404), 2640 states have internal predecessors, (3404), 759 states have call successors, (759), 195 states have call predecessors, (759), 194 states have return successors, (749), 740 states have call predecessors, (749), 749 states have call successors, (749) [2023-12-02 17:48:28,103 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3576 states to 3576 states and 4912 transitions. [2023-12-02 17:48:28,104 INFO L78 Accepts]: Start accepts. Automaton has 3576 states and 4912 transitions. Word has length 67 [2023-12-02 17:48:28,104 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 17:48:28,104 INFO L495 AbstractCegarLoop]: Abstraction has 3576 states and 4912 transitions. [2023-12-02 17:48:28,104 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 22 states, 22 states have (on average 3.590909090909091) internal successors, (79), 22 states have internal predecessors, (79), 5 states have call successors, (13), 4 states have call predecessors, (13), 3 states have return successors, (12), 4 states have call predecessors, (12), 4 states have call successors, (12) [2023-12-02 17:48:28,105 INFO L276 IsEmpty]: Start isEmpty. Operand 3576 states and 4912 transitions. [2023-12-02 17:48:28,106 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 80 [2023-12-02 17:48:28,106 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 17:48:28,107 INFO L195 NwaCegarLoop]: trace histogram [9, 8, 8, 3, 3, 3, 3, 2, 2, 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] [2023-12-02 17:48:28,112 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9baea50c-125b-415c-97d3-07da8d4dc433/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (22)] Ended with exit code 0 [2023-12-02 17:48:28,307 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable20,22 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9baea50c-125b-415c-97d3-07da8d4dc433/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 17:48:28,307 INFO L420 AbstractCegarLoop]: === Iteration 22 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 17:48:28,308 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 17:48:28,308 INFO L85 PathProgramCache]: Analyzing trace with hash 689077281, now seen corresponding path program 1 times [2023-12-02 17:48:28,308 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 17:48:28,308 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [466035178] [2023-12-02 17:48:28,308 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 17:48:28,308 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 17:48:28,317 ERROR L246 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2023-12-02 17:48:28,317 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1048194662] [2023-12-02 17:48:28,317 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 17:48:28,317 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 17:48:28,317 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9baea50c-125b-415c-97d3-07da8d4dc433/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 17:48:28,318 INFO L229 MonitoredProcess]: Starting monitored process 23 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9baea50c-125b-415c-97d3-07da8d4dc433/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 17:48:28,319 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9baea50c-125b-415c-97d3-07da8d4dc433/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (23)] Waiting until timeout for monitored process [2023-12-02 17:48:28,385 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 17:48:28,388 INFO L262 TraceCheckSpWp]: Trace formula consists of 229 conjuncts, 76 conjunts are in the unsatisfiable core [2023-12-02 17:48:28,391 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 17:48:29,589 INFO L134 CoverageAnalysis]: Checked inductivity of 156 backedges. 30 proven. 34 refuted. 0 times theorem prover too weak. 92 trivial. 0 not checked. [2023-12-02 17:48:29,589 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-12-02 17:48:40,209 INFO L134 CoverageAnalysis]: Checked inductivity of 156 backedges. 30 proven. 33 refuted. 0 times theorem prover too weak. 93 trivial. 0 not checked. [2023-12-02 17:48:40,209 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 17:48:40,209 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [466035178] [2023-12-02 17:48:40,210 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2023-12-02 17:48:40,210 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1048194662] [2023-12-02 17:48:40,210 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1048194662] provided 0 perfect and 2 imperfect interpolant sequences [2023-12-02 17:48:40,210 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [312372476] [2023-12-02 17:48:40,212 INFO L159 IcfgInterpreter]: Started Sifa with 28 locations of interest [2023-12-02 17:48:40,212 INFO L166 IcfgInterpreter]: Building call graph [2023-12-02 17:48:40,212 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-12-02 17:48:40,213 INFO L176 IcfgInterpreter]: Starting interpretation [2023-12-02 17:48:40,213 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-12-02 17:48:46,970 WARN L110 ntervalStateProvider]: Interval conversion did not stabilize in 14 iterations. Over-approximation may be very coarse. [2023-12-02 17:48:46,971 WARN L110 ntervalStateProvider]: Interval conversion did not stabilize in 14 iterations. Over-approximation may be very coarse. [2023-12-02 17:48:46,971 WARN L110 ntervalStateProvider]: Interval conversion did not stabilize in 14 iterations. Over-approximation may be very coarse. [2023-12-02 17:48:46,971 WARN L110 ntervalStateProvider]: Interval conversion did not stabilize in 14 iterations. Over-approximation may be very coarse. [2023-12-02 17:48:47,049 WARN L110 ntervalStateProvider]: Interval conversion did not stabilize in 14 iterations. Over-approximation may be very coarse. [2023-12-02 17:48:47,049 WARN L110 ntervalStateProvider]: Interval conversion did not stabilize in 14 iterations. Over-approximation may be very coarse. [2023-12-02 17:48:47,050 WARN L110 ntervalStateProvider]: Interval conversion did not stabilize in 14 iterations. Over-approximation may be very coarse. [2023-12-02 17:48:47,050 WARN L110 ntervalStateProvider]: Interval conversion did not stabilize in 14 iterations. Over-approximation may be very coarse. [2023-12-02 17:48:47,314 WARN L110 ntervalStateProvider]: Interval conversion did not stabilize in 13 iterations. Over-approximation may be very coarse. [2023-12-02 17:48:47,315 WARN L110 ntervalStateProvider]: Interval conversion did not stabilize in 13 iterations. Over-approximation may be very coarse. [2023-12-02 17:48:47,315 WARN L110 ntervalStateProvider]: Interval conversion did not stabilize in 13 iterations. Over-approximation may be very coarse. [2023-12-02 17:48:47,316 WARN L110 ntervalStateProvider]: Interval conversion did not stabilize in 13 iterations. Over-approximation may be very coarse. [2023-12-02 17:48:47,527 WARN L110 ntervalStateProvider]: Interval conversion did not stabilize in 13 iterations. Over-approximation may be very coarse. [2023-12-02 17:48:47,527 WARN L110 ntervalStateProvider]: Interval conversion did not stabilize in 13 iterations. Over-approximation may be very coarse. [2023-12-02 17:48:47,528 WARN L110 ntervalStateProvider]: Interval conversion did not stabilize in 13 iterations. Over-approximation may be very coarse. [2023-12-02 17:48:47,528 WARN L110 ntervalStateProvider]: Interval conversion did not stabilize in 13 iterations. Over-approximation may be very coarse. [2023-12-02 17:48:47,637 WARN L110 ntervalStateProvider]: Interval conversion did not stabilize in 13 iterations. Over-approximation may be very coarse. [2023-12-02 17:48:47,637 WARN L110 ntervalStateProvider]: Interval conversion did not stabilize in 13 iterations. Over-approximation may be very coarse. [2023-12-02 17:48:47,638 WARN L110 ntervalStateProvider]: Interval conversion did not stabilize in 13 iterations. Over-approximation may be very coarse. [2023-12-02 17:48:47,638 WARN L110 ntervalStateProvider]: Interval conversion did not stabilize in 13 iterations. Over-approximation may be very coarse. [2023-12-02 17:48:47,760 WARN L110 ntervalStateProvider]: Interval conversion did not stabilize in 14 iterations. Over-approximation may be very coarse. [2023-12-02 17:48:47,761 WARN L110 ntervalStateProvider]: Interval conversion did not stabilize in 14 iterations. Over-approximation may be very coarse. [2023-12-02 17:48:47,761 WARN L110 ntervalStateProvider]: Interval conversion did not stabilize in 14 iterations. Over-approximation may be very coarse. [2023-12-02 17:48:47,762 WARN L110 ntervalStateProvider]: Interval conversion did not stabilize in 14 iterations. Over-approximation may be very coarse. [2023-12-02 17:48:47,775 WARN L110 ntervalStateProvider]: Interval conversion did not stabilize in 14 iterations. Over-approximation may be very coarse. [2023-12-02 17:48:47,776 WARN L110 ntervalStateProvider]: Interval conversion did not stabilize in 14 iterations. Over-approximation may be very coarse. [2023-12-02 17:48:47,776 WARN L110 ntervalStateProvider]: Interval conversion did not stabilize in 14 iterations. Over-approximation may be very coarse. [2023-12-02 17:48:47,777 WARN L110 ntervalStateProvider]: Interval conversion did not stabilize in 14 iterations. Over-approximation may be very coarse. [2023-12-02 17:48:48,006 WARN L110 ntervalStateProvider]: Interval conversion did not stabilize in 9 iterations. Over-approximation may be very coarse. [2023-12-02 17:48:48,006 WARN L110 ntervalStateProvider]: Interval conversion did not stabilize in 9 iterations. Over-approximation may be very coarse. [2023-12-02 17:48:48,007 WARN L110 ntervalStateProvider]: Interval conversion did not stabilize in 9 iterations. Over-approximation may be very coarse. [2023-12-02 17:48:48,007 WARN L110 ntervalStateProvider]: Interval conversion did not stabilize in 9 iterations. Over-approximation may be very coarse. [2023-12-02 17:48:48,078 WARN L110 ntervalStateProvider]: Interval conversion did not stabilize in 10 iterations. Over-approximation may be very coarse. [2023-12-02 17:48:48,078 WARN L110 ntervalStateProvider]: Interval conversion did not stabilize in 10 iterations. Over-approximation may be very coarse. [2023-12-02 17:48:48,079 WARN L110 ntervalStateProvider]: Interval conversion did not stabilize in 10 iterations. Over-approximation may be very coarse. [2023-12-02 17:48:48,079 WARN L110 ntervalStateProvider]: Interval conversion did not stabilize in 10 iterations. Over-approximation may be very coarse. [2023-12-02 17:48:48,089 WARN L110 ntervalStateProvider]: Interval conversion did not stabilize in 10 iterations. Over-approximation may be very coarse. [2023-12-02 17:48:48,089 WARN L110 ntervalStateProvider]: Interval conversion did not stabilize in 10 iterations. Over-approximation may be very coarse. [2023-12-02 17:48:48,324 WARN L110 ntervalStateProvider]: Interval conversion did not stabilize in 9 iterations. Over-approximation may be very coarse. [2023-12-02 17:48:48,324 WARN L110 ntervalStateProvider]: Interval conversion did not stabilize in 9 iterations. Over-approximation may be very coarse. [2023-12-02 17:48:48,386 WARN L110 ntervalStateProvider]: Interval conversion did not stabilize in 10 iterations. Over-approximation may be very coarse. [2023-12-02 17:48:48,387 WARN L110 ntervalStateProvider]: Interval conversion did not stabilize in 10 iterations. Over-approximation may be very coarse. [2023-12-02 17:48:55,505 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 8 for LOIs [2023-12-02 17:48:55,509 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 64 for LOIs [2023-12-02 17:48:55,529 INFO L180 IcfgInterpreter]: Interpretation finished [2023-12-02 17:49:08,564 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '39323#(and (<= 1 |#StackHeapBarrier|) (<= 1 ~counter~0) (= |__VERIFIER_assert_#in~cond| 0) (= __VERIFIER_assert_~cond 0) (<= ~counter~0 20))' at error location [2023-12-02 17:49:08,565 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-12-02 17:49:08,565 INFO L185 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2023-12-02 17:49:08,565 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [19, 16] total 32 [2023-12-02 17:49:08,565 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [558711169] [2023-12-02 17:49:08,565 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2023-12-02 17:49:08,565 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 32 states [2023-12-02 17:49:08,565 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 17:49:08,566 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 32 interpolants. [2023-12-02 17:49:08,567 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=297, Invalid=2782, Unknown=1, NotChecked=0, Total=3080 [2023-12-02 17:49:08,568 INFO L87 Difference]: Start difference. First operand 3576 states and 4912 transitions. Second operand has 32 states, 29 states have (on average 2.4827586206896552) internal successors, (72), 30 states have internal predecessors, (72), 9 states have call successors, (21), 3 states have call predecessors, (21), 3 states have return successors, (20), 7 states have call predecessors, (20), 7 states have call successors, (20) [2023-12-02 17:49:18,491 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2023-12-02 17:49:25,318 WARN L539 Checker$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 17:49:35,841 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 17:49:47,853 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 17:49:47,853 INFO L93 Difference]: Finished difference Result 5435 states and 7570 transitions. [2023-12-02 17:49:47,853 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 68 states. [2023-12-02 17:49:47,854 INFO L78 Accepts]: Start accepts. Automaton has has 32 states, 29 states have (on average 2.4827586206896552) internal successors, (72), 30 states have internal predecessors, (72), 9 states have call successors, (21), 3 states have call predecessors, (21), 3 states have return successors, (20), 7 states have call predecessors, (20), 7 states have call successors, (20) Word has length 79 [2023-12-02 17:49:47,854 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 17:49:47,877 INFO L225 Difference]: With dead ends: 5435 [2023-12-02 17:49:47,878 INFO L226 Difference]: Without dead ends: 5384 [2023-12-02 17:49:47,882 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 294 GetRequests, 181 SyntacticMatches, 0 SemanticMatches, 113 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4195 ImplicationChecksByTransitivity, 36.7s TimeCoverageRelationStatistics Valid=1941, Invalid=11168, Unknown=1, NotChecked=0, Total=13110 [2023-12-02 17:49:47,883 INFO L413 NwaCegarLoop]: 79 mSDtfsCounter, 506 mSDsluCounter, 1122 mSDsCounter, 0 mSdLazyCounter, 1123 mSolverCounterSat, 333 mSolverCounterUnsat, 3 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 14.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 506 SdHoareTripleChecker+Valid, 1201 SdHoareTripleChecker+Invalid, 1459 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 333 IncrementalHoareTripleChecker+Valid, 1123 IncrementalHoareTripleChecker+Invalid, 3 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 14.6s IncrementalHoareTripleChecker+Time [2023-12-02 17:49:47,883 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [506 Valid, 1201 Invalid, 1459 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [333 Valid, 1123 Invalid, 3 Unknown, 0 Unchecked, 14.6s Time] [2023-12-02 17:49:47,887 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 5384 states. [2023-12-02 17:49:51,297 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 5384 to 4713. [2023-12-02 17:49:51,303 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 4713 states, 3569 states have (on average 1.3210983468758757) internal successors, (4715), 3596 states have internal predecessors, (4715), 918 states have call successors, (918), 226 states have call predecessors, (918), 225 states have return successors, (908), 890 states have call predecessors, (908), 908 states have call successors, (908) [2023-12-02 17:49:51,313 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 4713 states to 4713 states and 6541 transitions. [2023-12-02 17:49:51,313 INFO L78 Accepts]: Start accepts. Automaton has 4713 states and 6541 transitions. Word has length 79 [2023-12-02 17:49:51,313 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 17:49:51,313 INFO L495 AbstractCegarLoop]: Abstraction has 4713 states and 6541 transitions. [2023-12-02 17:49:51,313 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 32 states, 29 states have (on average 2.4827586206896552) internal successors, (72), 30 states have internal predecessors, (72), 9 states have call successors, (21), 3 states have call predecessors, (21), 3 states have return successors, (20), 7 states have call predecessors, (20), 7 states have call successors, (20) [2023-12-02 17:49:51,313 INFO L276 IsEmpty]: Start isEmpty. Operand 4713 states and 6541 transitions. [2023-12-02 17:49:51,315 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 89 [2023-12-02 17:49:51,315 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 17:49:51,315 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, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-12-02 17:49:51,321 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9baea50c-125b-415c-97d3-07da8d4dc433/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (23)] Ended with exit code 0 [2023-12-02 17:49:51,516 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable21,23 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9baea50c-125b-415c-97d3-07da8d4dc433/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 17:49:51,516 INFO L420 AbstractCegarLoop]: === Iteration 23 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 17:49:51,516 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 17:49:51,516 INFO L85 PathProgramCache]: Analyzing trace with hash -1625136501, now seen corresponding path program 1 times [2023-12-02 17:49:51,517 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 17:49:51,517 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2106393201] [2023-12-02 17:49:51,517 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 17:49:51,517 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 17:49:51,524 ERROR L246 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2023-12-02 17:49:51,524 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1513207797] [2023-12-02 17:49:51,524 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 17:49:51,524 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 17:49:51,524 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9baea50c-125b-415c-97d3-07da8d4dc433/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 17:49:51,525 INFO L229 MonitoredProcess]: Starting monitored process 24 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9baea50c-125b-415c-97d3-07da8d4dc433/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 17:49:51,527 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9baea50c-125b-415c-97d3-07da8d4dc433/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (24)] Waiting until timeout for monitored process [2023-12-02 17:49:51,589 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 17:49:51,591 INFO L262 TraceCheckSpWp]: Trace formula consists of 264 conjuncts, 21 conjunts are in the unsatisfiable core [2023-12-02 17:49:51,594 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 17:49:51,721 INFO L134 CoverageAnalysis]: Checked inductivity of 182 backedges. 24 proven. 108 refuted. 0 times theorem prover too weak. 50 trivial. 0 not checked. [2023-12-02 17:49:51,721 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-12-02 17:49:51,909 INFO L134 CoverageAnalysis]: Checked inductivity of 182 backedges. 24 proven. 44 refuted. 0 times theorem prover too weak. 114 trivial. 0 not checked. [2023-12-02 17:49:51,909 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 17:49:51,909 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2106393201] [2023-12-02 17:49:51,910 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2023-12-02 17:49:51,910 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1513207797] [2023-12-02 17:49:51,910 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1513207797] provided 0 perfect and 2 imperfect interpolant sequences [2023-12-02 17:49:51,910 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [89620061] [2023-12-02 17:49:51,911 INFO L159 IcfgInterpreter]: Started Sifa with 28 locations of interest [2023-12-02 17:49:51,911 INFO L166 IcfgInterpreter]: Building call graph [2023-12-02 17:49:51,911 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-12-02 17:49:51,911 INFO L176 IcfgInterpreter]: Starting interpretation [2023-12-02 17:49:51,911 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-12-02 17:49:57,830 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 1 for LOIs [2023-12-02 17:49:57,832 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 64 for LOIs [2023-12-02 17:49:57,852 INFO L180 IcfgInterpreter]: Interpretation finished [2023-12-02 17:49:58,977 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '54538#(and (= |__VERIFIER_assert_#in~cond| 0) (= __VERIFIER_assert_~cond 0))' at error location [2023-12-02 17:49:58,977 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-12-02 17:49:58,977 INFO L185 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2023-12-02 17:49:58,978 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 13] total 24 [2023-12-02 17:49:58,978 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1227618536] [2023-12-02 17:49:58,978 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2023-12-02 17:49:58,978 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 24 states [2023-12-02 17:49:58,978 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 17:49:58,979 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2023-12-02 17:49:58,979 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=404, Invalid=1402, Unknown=0, NotChecked=0, Total=1806 [2023-12-02 17:49:58,980 INFO L87 Difference]: Start difference. First operand 4713 states and 6541 transitions. Second operand has 24 states, 24 states have (on average 3.625) internal successors, (87), 24 states have internal predecessors, (87), 7 states have call successors, (21), 5 states have call predecessors, (21), 4 states have return successors, (20), 6 states have call predecessors, (20), 6 states have call successors, (20) [2023-12-02 17:50:03,576 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 17:50:03,576 INFO L93 Difference]: Finished difference Result 6670 states and 9292 transitions. [2023-12-02 17:50:03,576 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 40 states. [2023-12-02 17:50:03,577 INFO L78 Accepts]: Start accepts. Automaton has has 24 states, 24 states have (on average 3.625) internal successors, (87), 24 states have internal predecessors, (87), 7 states have call successors, (21), 5 states have call predecessors, (21), 4 states have return successors, (20), 6 states have call predecessors, (20), 6 states have call successors, (20) Word has length 88 [2023-12-02 17:50:03,577 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 17:50:03,597 INFO L225 Difference]: With dead ends: 6670 [2023-12-02 17:50:03,597 INFO L226 Difference]: Without dead ends: 4617 [2023-12-02 17:50:03,601 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 279 GetRequests, 217 SyntacticMatches, 4 SemanticMatches, 58 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1138 ImplicationChecksByTransitivity, 1.5s TimeCoverageRelationStatistics Valid=753, Invalid=2787, Unknown=0, NotChecked=0, Total=3540 [2023-12-02 17:50:03,602 INFO L413 NwaCegarLoop]: 36 mSDtfsCounter, 490 mSDsluCounter, 384 mSDsCounter, 0 mSdLazyCounter, 264 mSolverCounterSat, 131 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 490 SdHoareTripleChecker+Valid, 420 SdHoareTripleChecker+Invalid, 395 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 131 IncrementalHoareTripleChecker+Valid, 264 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2023-12-02 17:50:03,602 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [490 Valid, 420 Invalid, 395 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [131 Valid, 264 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2023-12-02 17:50:03,606 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 4617 states. [2023-12-02 17:50:07,143 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 4617 to 4417. [2023-12-02 17:50:07,149 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 4417 states, 3119 states have (on average 1.2170567489579993) internal successors, (3796), 3139 states have internal predecessors, (3796), 1038 states have call successors, (1038), 260 states have call predecessors, (1038), 259 states have return successors, (1026), 1017 states have call predecessors, (1026), 1026 states have call successors, (1026) [2023-12-02 17:50:07,159 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 4417 states to 4417 states and 5860 transitions. [2023-12-02 17:50:07,159 INFO L78 Accepts]: Start accepts. Automaton has 4417 states and 5860 transitions. Word has length 88 [2023-12-02 17:50:07,160 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 17:50:07,160 INFO L495 AbstractCegarLoop]: Abstraction has 4417 states and 5860 transitions. [2023-12-02 17:50:07,160 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 24 states, 24 states have (on average 3.625) internal successors, (87), 24 states have internal predecessors, (87), 7 states have call successors, (21), 5 states have call predecessors, (21), 4 states have return successors, (20), 6 states have call predecessors, (20), 6 states have call successors, (20) [2023-12-02 17:50:07,160 INFO L276 IsEmpty]: Start isEmpty. Operand 4417 states and 5860 transitions. [2023-12-02 17:50:07,161 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 90 [2023-12-02 17:50:07,161 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 17:50:07,161 INFO L195 NwaCegarLoop]: trace histogram [9, 8, 8, 5, 5, 4, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-12-02 17:50:07,167 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9baea50c-125b-415c-97d3-07da8d4dc433/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (24)] Forceful destruction successful, exit code 0 [2023-12-02 17:50:07,362 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable22,24 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9baea50c-125b-415c-97d3-07da8d4dc433/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 17:50:07,362 INFO L420 AbstractCegarLoop]: === Iteration 24 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 17:50:07,362 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 17:50:07,362 INFO L85 PathProgramCache]: Analyzing trace with hash 1576694894, now seen corresponding path program 2 times [2023-12-02 17:50:07,362 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 17:50:07,362 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1254205556] [2023-12-02 17:50:07,362 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 17:50:07,362 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 17:50:07,369 ERROR L246 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2023-12-02 17:50:07,370 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1209305759] [2023-12-02 17:50:07,370 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2023-12-02 17:50:07,370 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 17:50:07,370 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9baea50c-125b-415c-97d3-07da8d4dc433/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 17:50:07,371 INFO L229 MonitoredProcess]: Starting monitored process 25 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9baea50c-125b-415c-97d3-07da8d4dc433/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 17:50:07,371 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9baea50c-125b-415c-97d3-07da8d4dc433/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (25)] Waiting until timeout for monitored process [2023-12-02 17:50:07,447 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2023-12-02 17:50:07,447 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-12-02 17:50:07,449 INFO L262 TraceCheckSpWp]: Trace formula consists of 220 conjuncts, 23 conjunts are in the unsatisfiable core [2023-12-02 17:50:07,452 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 17:50:07,576 INFO L134 CoverageAnalysis]: Checked inductivity of 186 backedges. 16 proven. 120 refuted. 0 times theorem prover too weak. 50 trivial. 0 not checked. [2023-12-02 17:50:07,576 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-12-02 17:50:07,765 INFO L134 CoverageAnalysis]: Checked inductivity of 186 backedges. 16 proven. 56 refuted. 0 times theorem prover too weak. 114 trivial. 0 not checked. [2023-12-02 17:50:07,765 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 17:50:07,766 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1254205556] [2023-12-02 17:50:07,766 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2023-12-02 17:50:07,766 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1209305759] [2023-12-02 17:50:07,766 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1209305759] provided 0 perfect and 2 imperfect interpolant sequences [2023-12-02 17:50:07,766 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [289422446] [2023-12-02 17:50:07,767 INFO L159 IcfgInterpreter]: Started Sifa with 28 locations of interest [2023-12-02 17:50:07,767 INFO L166 IcfgInterpreter]: Building call graph [2023-12-02 17:50:07,767 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-12-02 17:50:07,768 INFO L176 IcfgInterpreter]: Starting interpretation [2023-12-02 17:50:07,768 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-12-02 17:50:11,342 WARN L110 ntervalStateProvider]: Interval conversion did not stabilize in 14 iterations. Over-approximation may be very coarse. [2023-12-02 17:50:11,343 WARN L110 ntervalStateProvider]: Interval conversion did not stabilize in 15 iterations. Over-approximation may be very coarse. [2023-12-02 17:50:11,343 WARN L110 ntervalStateProvider]: Interval conversion did not stabilize in 14 iterations. Over-approximation may be very coarse. [2023-12-02 17:50:11,343 WARN L110 ntervalStateProvider]: Interval conversion did not stabilize in 15 iterations. Over-approximation may be very coarse. [2023-12-02 17:50:11,423 WARN L110 ntervalStateProvider]: Interval conversion did not stabilize in 14 iterations. Over-approximation may be very coarse. [2023-12-02 17:50:11,423 WARN L110 ntervalStateProvider]: Interval conversion did not stabilize in 15 iterations. Over-approximation may be very coarse. [2023-12-02 17:50:11,424 WARN L110 ntervalStateProvider]: Interval conversion did not stabilize in 14 iterations. Over-approximation may be very coarse. [2023-12-02 17:50:11,424 WARN L110 ntervalStateProvider]: Interval conversion did not stabilize in 15 iterations. Over-approximation may be very coarse. [2023-12-02 17:50:13,390 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 9 for LOIs [2023-12-02 17:50:13,394 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 64 for LOIs [2023-12-02 17:50:13,414 INFO L180 IcfgInterpreter]: Interpretation finished [2023-12-02 17:50:20,823 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '71094#(and (<= 1 |#StackHeapBarrier|) (= |__VERIFIER_assert_#in~cond| 0) (= __VERIFIER_assert_~cond 0) (<= ~counter~0 21) (<= 3 ~counter~0))' at error location [2023-12-02 17:50:20,823 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-12-02 17:50:20,823 INFO L185 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2023-12-02 17:50:20,823 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 14] total 24 [2023-12-02 17:50:20,824 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [37051694] [2023-12-02 17:50:20,824 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2023-12-02 17:50:20,824 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 24 states [2023-12-02 17:50:20,824 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 17:50:20,825 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2023-12-02 17:50:20,825 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=428, Invalid=1734, Unknown=0, NotChecked=0, Total=2162 [2023-12-02 17:50:20,826 INFO L87 Difference]: Start difference. First operand 4417 states and 5860 transitions. Second operand has 24 states, 24 states have (on average 3.8333333333333335) internal successors, (92), 24 states have internal predecessors, (92), 6 states have call successors, (21), 5 states have call predecessors, (21), 4 states have return successors, (20), 5 states have call predecessors, (20), 5 states have call successors, (20) [2023-12-02 17:50:25,326 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 17:50:25,326 INFO L93 Difference]: Finished difference Result 4637 states and 6086 transitions. [2023-12-02 17:50:25,327 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 40 states. [2023-12-02 17:50:25,327 INFO L78 Accepts]: Start accepts. Automaton has has 24 states, 24 states have (on average 3.8333333333333335) internal successors, (92), 24 states have internal predecessors, (92), 6 states have call successors, (21), 5 states have call predecessors, (21), 4 states have return successors, (20), 5 states have call predecessors, (20), 5 states have call successors, (20) Word has length 89 [2023-12-02 17:50:25,327 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 17:50:25,353 INFO L225 Difference]: With dead ends: 4637 [2023-12-02 17:50:25,353 INFO L226 Difference]: Without dead ends: 4585 [2023-12-02 17:50:25,355 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 282 GetRequests, 218 SyntacticMatches, 2 SemanticMatches, 62 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1336 ImplicationChecksByTransitivity, 7.8s TimeCoverageRelationStatistics Valid=780, Invalid=3252, Unknown=0, NotChecked=0, Total=4032 [2023-12-02 17:50:25,356 INFO L413 NwaCegarLoop]: 36 mSDtfsCounter, 410 mSDsluCounter, 367 mSDsCounter, 0 mSdLazyCounter, 280 mSolverCounterSat, 93 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 410 SdHoareTripleChecker+Valid, 403 SdHoareTripleChecker+Invalid, 373 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 93 IncrementalHoareTripleChecker+Valid, 280 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2023-12-02 17:50:25,356 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [410 Valid, 403 Invalid, 373 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [93 Valid, 280 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2023-12-02 17:50:25,360 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 4585 states. [2023-12-02 17:50:28,985 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 4585 to 4494. [2023-12-02 17:50:28,991 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 4494 states, 3196 states have (on average 1.187421777221527) internal successors, (3795), 3216 states have internal predecessors, (3795), 1038 states have call successors, (1038), 260 states have call predecessors, (1038), 259 states have return successors, (1026), 1017 states have call predecessors, (1026), 1026 states have call successors, (1026) [2023-12-02 17:50:29,001 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 4494 states to 4494 states and 5859 transitions. [2023-12-02 17:50:29,001 INFO L78 Accepts]: Start accepts. Automaton has 4494 states and 5859 transitions. Word has length 89 [2023-12-02 17:50:29,001 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 17:50:29,001 INFO L495 AbstractCegarLoop]: Abstraction has 4494 states and 5859 transitions. [2023-12-02 17:50:29,001 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 24 states, 24 states have (on average 3.8333333333333335) internal successors, (92), 24 states have internal predecessors, (92), 6 states have call successors, (21), 5 states have call predecessors, (21), 4 states have return successors, (20), 5 states have call predecessors, (20), 5 states have call successors, (20) [2023-12-02 17:50:29,001 INFO L276 IsEmpty]: Start isEmpty. Operand 4494 states and 5859 transitions. [2023-12-02 17:50:29,002 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 91 [2023-12-02 17:50:29,002 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 17:50:29,003 INFO L195 NwaCegarLoop]: trace histogram [9, 8, 8, 5, 5, 4, 4, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-12-02 17:50:29,010 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9baea50c-125b-415c-97d3-07da8d4dc433/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (25)] Ended with exit code 0 [2023-12-02 17:50:29,203 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable23,25 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9baea50c-125b-415c-97d3-07da8d4dc433/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 17:50:29,203 INFO L420 AbstractCegarLoop]: === Iteration 25 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 17:50:29,203 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 17:50:29,204 INFO L85 PathProgramCache]: Analyzing trace with hash 1613266328, now seen corresponding path program 2 times [2023-12-02 17:50:29,204 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 17:50:29,204 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2034082401] [2023-12-02 17:50:29,204 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 17:50:29,204 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 17:50:29,214 ERROR L246 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2023-12-02 17:50:29,214 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [833166775] [2023-12-02 17:50:29,214 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2023-12-02 17:50:29,214 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 17:50:29,214 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9baea50c-125b-415c-97d3-07da8d4dc433/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 17:50:29,215 INFO L229 MonitoredProcess]: Starting monitored process 26 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9baea50c-125b-415c-97d3-07da8d4dc433/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 17:50:29,216 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9baea50c-125b-415c-97d3-07da8d4dc433/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (26)] Waiting until timeout for monitored process [2023-12-02 17:50:29,264 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2023-12-02 17:50:29,264 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-12-02 17:50:29,265 INFO L262 TraceCheckSpWp]: Trace formula consists of 156 conjuncts, 8 conjunts are in the unsatisfiable core [2023-12-02 17:50:29,267 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 17:50:29,315 INFO L134 CoverageAnalysis]: Checked inductivity of 189 backedges. 56 proven. 7 refuted. 0 times theorem prover too weak. 126 trivial. 0 not checked. [2023-12-02 17:50:29,315 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-12-02 17:50:29,370 INFO L134 CoverageAnalysis]: Checked inductivity of 189 backedges. 56 proven. 7 refuted. 0 times theorem prover too weak. 126 trivial. 0 not checked. [2023-12-02 17:50:29,370 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 17:50:29,370 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2034082401] [2023-12-02 17:50:29,370 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2023-12-02 17:50:29,370 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [833166775] [2023-12-02 17:50:29,370 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [833166775] provided 0 perfect and 2 imperfect interpolant sequences [2023-12-02 17:50:29,370 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [927338549] [2023-12-02 17:50:29,371 INFO L159 IcfgInterpreter]: Started Sifa with 28 locations of interest [2023-12-02 17:50:29,371 INFO L166 IcfgInterpreter]: Building call graph [2023-12-02 17:50:29,372 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-12-02 17:50:29,372 INFO L176 IcfgInterpreter]: Starting interpretation [2023-12-02 17:50:29,372 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-12-02 17:50:33,067 WARN L110 ntervalStateProvider]: Interval conversion did not stabilize in 14 iterations. Over-approximation may be very coarse. [2023-12-02 17:50:33,067 WARN L110 ntervalStateProvider]: Interval conversion did not stabilize in 15 iterations. Over-approximation may be very coarse. [2023-12-02 17:50:33,068 WARN L110 ntervalStateProvider]: Interval conversion did not stabilize in 14 iterations. Over-approximation may be very coarse. [2023-12-02 17:50:33,068 WARN L110 ntervalStateProvider]: Interval conversion did not stabilize in 15 iterations. Over-approximation may be very coarse. [2023-12-02 17:50:33,143 WARN L110 ntervalStateProvider]: Interval conversion did not stabilize in 14 iterations. Over-approximation may be very coarse. [2023-12-02 17:50:33,144 WARN L110 ntervalStateProvider]: Interval conversion did not stabilize in 15 iterations. Over-approximation may be very coarse. [2023-12-02 17:50:33,145 WARN L110 ntervalStateProvider]: Interval conversion did not stabilize in 14 iterations. Over-approximation may be very coarse. [2023-12-02 17:50:33,145 WARN L110 ntervalStateProvider]: Interval conversion did not stabilize in 15 iterations. Over-approximation may be very coarse. [2023-12-02 17:50:35,173 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 8 for LOIs [2023-12-02 17:50:35,177 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 64 for LOIs [2023-12-02 17:50:35,197 INFO L180 IcfgInterpreter]: Interpretation finished [2023-12-02 17:50:42,897 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '84890#(and (<= 1 |#StackHeapBarrier|) (<= 1 ~counter~0) (= |__VERIFIER_assert_#in~cond| 0) (= __VERIFIER_assert_~cond 0) (<= ~counter~0 20))' at error location [2023-12-02 17:50:42,897 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-12-02 17:50:42,897 INFO L185 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2023-12-02 17:50:42,897 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8] total 8 [2023-12-02 17:50:42,898 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2021519171] [2023-12-02 17:50:42,898 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2023-12-02 17:50:42,898 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2023-12-02 17:50:42,898 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 17:50:42,898 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2023-12-02 17:50:42,899 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=113, Invalid=817, Unknown=0, NotChecked=0, Total=930 [2023-12-02 17:50:42,899 INFO L87 Difference]: Start difference. First operand 4494 states and 5859 transitions. Second operand has 8 states, 8 states have (on average 5.0) internal successors, (40), 8 states have internal predecessors, (40), 3 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 17:50:48,082 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 17:50:48,082 INFO L93 Difference]: Finished difference Result 5582 states and 7450 transitions. [2023-12-02 17:50:48,083 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2023-12-02 17:50:48,083 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 8 states have (on average 5.0) internal successors, (40), 8 states have internal predecessors, (40), 3 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 90 [2023-12-02 17:50:48,083 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 17:50:48,099 INFO L225 Difference]: With dead ends: 5582 [2023-12-02 17:50:48,099 INFO L226 Difference]: Without dead ends: 5530 [2023-12-02 17:50:48,100 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 289 GetRequests, 242 SyntacticMatches, 5 SemanticMatches, 42 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 355 ImplicationChecksByTransitivity, 7.9s TimeCoverageRelationStatistics Valid=208, Invalid=1684, Unknown=0, NotChecked=0, Total=1892 [2023-12-02 17:50:48,101 INFO L413 NwaCegarLoop]: 67 mSDtfsCounter, 122 mSDsluCounter, 308 mSDsCounter, 0 mSdLazyCounter, 187 mSolverCounterSat, 57 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 126 SdHoareTripleChecker+Valid, 375 SdHoareTripleChecker+Invalid, 244 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 57 IncrementalHoareTripleChecker+Valid, 187 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2023-12-02 17:50:48,101 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [126 Valid, 375 Invalid, 244 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [57 Valid, 187 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2023-12-02 17:50:48,105 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 5530 states. [2023-12-02 17:50:51,432 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 5530 to 4129. [2023-12-02 17:50:51,435 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 4129 states, 2879 states have (on average 1.2007641542202154) internal successors, (3457), 2902 states have internal predecessors, (3457), 990 states have call successors, (990), 260 states have call predecessors, (990), 259 states have return successors, (978), 966 states have call predecessors, (978), 978 states have call successors, (978) [2023-12-02 17:50:51,443 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 4129 states to 4129 states and 5425 transitions. [2023-12-02 17:50:51,443 INFO L78 Accepts]: Start accepts. Automaton has 4129 states and 5425 transitions. Word has length 90 [2023-12-02 17:50:51,444 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 17:50:51,444 INFO L495 AbstractCegarLoop]: Abstraction has 4129 states and 5425 transitions. [2023-12-02 17:50:51,444 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 8 states, 8 states have (on average 5.0) internal successors, (40), 8 states have internal predecessors, (40), 3 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 17:50:51,444 INFO L276 IsEmpty]: Start isEmpty. Operand 4129 states and 5425 transitions. [2023-12-02 17:50:51,445 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 100 [2023-12-02 17:50:51,445 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 17:50:51,445 INFO L195 NwaCegarLoop]: trace histogram [13, 12, 12, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-12-02 17:50:51,450 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9baea50c-125b-415c-97d3-07da8d4dc433/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (26)] Ended with exit code 0 [2023-12-02 17:50:51,645 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 26 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9baea50c-125b-415c-97d3-07da8d4dc433/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable24 [2023-12-02 17:50:51,646 INFO L420 AbstractCegarLoop]: === Iteration 26 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 17:50:51,646 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 17:50:51,646 INFO L85 PathProgramCache]: Analyzing trace with hash -307282759, now seen corresponding path program 2 times [2023-12-02 17:50:51,646 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 17:50:51,646 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1049969107] [2023-12-02 17:50:51,646 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 17:50:51,647 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 17:50:51,654 ERROR L246 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2023-12-02 17:50:51,654 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1645069272] [2023-12-02 17:50:51,655 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2023-12-02 17:50:51,655 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 17:50:51,655 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9baea50c-125b-415c-97d3-07da8d4dc433/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 17:50:51,656 INFO L229 MonitoredProcess]: Starting monitored process 27 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9baea50c-125b-415c-97d3-07da8d4dc433/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 17:50:51,657 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9baea50c-125b-415c-97d3-07da8d4dc433/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (27)] Waiting until timeout for monitored process [2023-12-02 17:50:51,720 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 5 check-sat command(s) [2023-12-02 17:50:51,720 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-12-02 17:50:51,722 INFO L262 TraceCheckSpWp]: Trace formula consists of 203 conjuncts, 63 conjunts are in the unsatisfiable core [2023-12-02 17:50:51,724 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 17:50:52,900 INFO L134 CoverageAnalysis]: Checked inductivity of 324 backedges. 24 proven. 35 refuted. 0 times theorem prover too weak. 265 trivial. 0 not checked. [2023-12-02 17:50:52,900 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-12-02 17:50:55,529 INFO L134 CoverageAnalysis]: Checked inductivity of 324 backedges. 24 proven. 34 refuted. 0 times theorem prover too weak. 266 trivial. 0 not checked. [2023-12-02 17:50:55,529 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 17:50:55,529 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1049969107] [2023-12-02 17:50:55,529 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2023-12-02 17:50:55,529 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1645069272] [2023-12-02 17:50:55,529 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1645069272] provided 0 perfect and 2 imperfect interpolant sequences [2023-12-02 17:50:55,529 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1438084826] [2023-12-02 17:50:55,531 INFO L159 IcfgInterpreter]: Started Sifa with 28 locations of interest [2023-12-02 17:50:55,531 INFO L166 IcfgInterpreter]: Building call graph [2023-12-02 17:50:55,531 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-12-02 17:50:55,532 INFO L176 IcfgInterpreter]: Starting interpretation [2023-12-02 17:50:55,532 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-12-02 17:51:02,212 WARN L110 ntervalStateProvider]: Interval conversion did not stabilize in 14 iterations. Over-approximation may be very coarse. [2023-12-02 17:51:02,212 WARN L110 ntervalStateProvider]: Interval conversion did not stabilize in 14 iterations. Over-approximation may be very coarse. [2023-12-02 17:51:02,213 WARN L110 ntervalStateProvider]: Interval conversion did not stabilize in 14 iterations. Over-approximation may be very coarse. [2023-12-02 17:51:02,213 WARN L110 ntervalStateProvider]: Interval conversion did not stabilize in 14 iterations. Over-approximation may be very coarse. [2023-12-02 17:51:02,290 WARN L110 ntervalStateProvider]: Interval conversion did not stabilize in 14 iterations. Over-approximation may be very coarse. [2023-12-02 17:51:02,291 WARN L110 ntervalStateProvider]: Interval conversion did not stabilize in 14 iterations. Over-approximation may be very coarse. [2023-12-02 17:51:02,291 WARN L110 ntervalStateProvider]: Interval conversion did not stabilize in 14 iterations. Over-approximation may be very coarse. [2023-12-02 17:51:02,292 WARN L110 ntervalStateProvider]: Interval conversion did not stabilize in 14 iterations. Over-approximation may be very coarse. [2023-12-02 17:51:02,553 WARN L110 ntervalStateProvider]: Interval conversion did not stabilize in 13 iterations. Over-approximation may be very coarse. [2023-12-02 17:51:02,554 WARN L110 ntervalStateProvider]: Interval conversion did not stabilize in 13 iterations. Over-approximation may be very coarse. [2023-12-02 17:51:02,554 WARN L110 ntervalStateProvider]: Interval conversion did not stabilize in 13 iterations. Over-approximation may be very coarse. [2023-12-02 17:51:02,555 WARN L110 ntervalStateProvider]: Interval conversion did not stabilize in 13 iterations. Over-approximation may be very coarse. [2023-12-02 17:51:02,723 WARN L110 ntervalStateProvider]: Interval conversion did not stabilize in 13 iterations. Over-approximation may be very coarse. [2023-12-02 17:51:02,723 WARN L110 ntervalStateProvider]: Interval conversion did not stabilize in 13 iterations. Over-approximation may be very coarse. [2023-12-02 17:51:02,723 WARN L110 ntervalStateProvider]: Interval conversion did not stabilize in 13 iterations. Over-approximation may be very coarse. [2023-12-02 17:51:02,724 WARN L110 ntervalStateProvider]: Interval conversion did not stabilize in 13 iterations. Over-approximation may be very coarse. [2023-12-02 17:51:02,828 WARN L110 ntervalStateProvider]: Interval conversion did not stabilize in 13 iterations. Over-approximation may be very coarse. [2023-12-02 17:51:02,829 WARN L110 ntervalStateProvider]: Interval conversion did not stabilize in 13 iterations. Over-approximation may be very coarse. [2023-12-02 17:51:02,829 WARN L110 ntervalStateProvider]: Interval conversion did not stabilize in 13 iterations. Over-approximation may be very coarse. [2023-12-02 17:51:02,829 WARN L110 ntervalStateProvider]: Interval conversion did not stabilize in 13 iterations. Over-approximation may be very coarse. [2023-12-02 17:51:02,933 WARN L110 ntervalStateProvider]: Interval conversion did not stabilize in 14 iterations. Over-approximation may be very coarse. [2023-12-02 17:51:02,933 WARN L110 ntervalStateProvider]: Interval conversion did not stabilize in 14 iterations. Over-approximation may be very coarse. [2023-12-02 17:51:02,934 WARN L110 ntervalStateProvider]: Interval conversion did not stabilize in 14 iterations. Over-approximation may be very coarse. [2023-12-02 17:51:02,934 WARN L110 ntervalStateProvider]: Interval conversion did not stabilize in 14 iterations. Over-approximation may be very coarse. [2023-12-02 17:51:02,947 WARN L110 ntervalStateProvider]: Interval conversion did not stabilize in 14 iterations. Over-approximation may be very coarse. [2023-12-02 17:51:02,948 WARN L110 ntervalStateProvider]: Interval conversion did not stabilize in 14 iterations. Over-approximation may be very coarse. [2023-12-02 17:51:02,948 WARN L110 ntervalStateProvider]: Interval conversion did not stabilize in 14 iterations. Over-approximation may be very coarse. [2023-12-02 17:51:02,949 WARN L110 ntervalStateProvider]: Interval conversion did not stabilize in 14 iterations. Over-approximation may be very coarse. [2023-12-02 17:51:03,144 WARN L110 ntervalStateProvider]: Interval conversion did not stabilize in 9 iterations. Over-approximation may be very coarse. [2023-12-02 17:51:03,145 WARN L110 ntervalStateProvider]: Interval conversion did not stabilize in 9 iterations. Over-approximation may be very coarse. [2023-12-02 17:51:03,231 WARN L110 ntervalStateProvider]: Interval conversion did not stabilize in 10 iterations. Over-approximation may be very coarse. [2023-12-02 17:51:03,231 WARN L110 ntervalStateProvider]: Interval conversion did not stabilize in 10 iterations. Over-approximation may be very coarse. [2023-12-02 17:51:03,555 WARN L110 ntervalStateProvider]: Interval conversion did not stabilize in 11 iterations. Over-approximation may be very coarse. [2023-12-02 17:51:03,556 WARN L110 ntervalStateProvider]: Interval conversion did not stabilize in 11 iterations. Over-approximation may be very coarse. [2023-12-02 17:51:03,556 WARN L110 ntervalStateProvider]: Interval conversion did not stabilize in 11 iterations. Over-approximation may be very coarse. [2023-12-02 17:51:03,556 WARN L110 ntervalStateProvider]: Interval conversion did not stabilize in 11 iterations. Over-approximation may be very coarse. [2023-12-02 17:51:03,618 WARN L110 ntervalStateProvider]: Interval conversion did not stabilize in 11 iterations. Over-approximation may be very coarse. [2023-12-02 17:51:03,618 WARN L110 ntervalStateProvider]: Interval conversion did not stabilize in 11 iterations. Over-approximation may be very coarse. [2023-12-02 17:51:03,618 WARN L110 ntervalStateProvider]: Interval conversion did not stabilize in 11 iterations. Over-approximation may be very coarse. [2023-12-02 17:51:03,619 WARN L110 ntervalStateProvider]: Interval conversion did not stabilize in 11 iterations. Over-approximation may be very coarse. [2023-12-02 17:51:03,831 WARN L110 ntervalStateProvider]: Interval conversion did not stabilize in 10 iterations. Over-approximation may be very coarse. [2023-12-02 17:51:03,832 WARN L110 ntervalStateProvider]: Interval conversion did not stabilize in 10 iterations. Over-approximation may be very coarse. [2023-12-02 17:51:03,832 WARN L110 ntervalStateProvider]: Interval conversion did not stabilize in 10 iterations. Over-approximation may be very coarse. [2023-12-02 17:51:03,832 WARN L110 ntervalStateProvider]: Interval conversion did not stabilize in 10 iterations. Over-approximation may be very coarse. [2023-12-02 17:51:04,046 WARN L110 ntervalStateProvider]: Interval conversion did not stabilize in 10 iterations. Over-approximation may be very coarse. [2023-12-02 17:51:04,047 WARN L110 ntervalStateProvider]: Interval conversion did not stabilize in 10 iterations. Over-approximation may be very coarse. [2023-12-02 17:51:04,047 WARN L110 ntervalStateProvider]: Interval conversion did not stabilize in 10 iterations. Over-approximation may be very coarse. [2023-12-02 17:51:04,047 WARN L110 ntervalStateProvider]: Interval conversion did not stabilize in 10 iterations. Over-approximation may be very coarse. [2023-12-02 17:51:04,133 WARN L110 ntervalStateProvider]: Interval conversion did not stabilize in 10 iterations. Over-approximation may be very coarse. [2023-12-02 17:51:04,133 WARN L110 ntervalStateProvider]: Interval conversion did not stabilize in 10 iterations. Over-approximation may be very coarse. [2023-12-02 17:51:04,134 WARN L110 ntervalStateProvider]: Interval conversion did not stabilize in 10 iterations. Over-approximation may be very coarse. [2023-12-02 17:51:04,134 WARN L110 ntervalStateProvider]: Interval conversion did not stabilize in 10 iterations. Over-approximation may be very coarse. [2023-12-02 17:51:04,221 WARN L110 ntervalStateProvider]: Interval conversion did not stabilize in 11 iterations. Over-approximation may be very coarse. [2023-12-02 17:51:04,221 WARN L110 ntervalStateProvider]: Interval conversion did not stabilize in 11 iterations. Over-approximation may be very coarse. [2023-12-02 17:51:04,222 WARN L110 ntervalStateProvider]: Interval conversion did not stabilize in 11 iterations. Over-approximation may be very coarse. [2023-12-02 17:51:04,222 WARN L110 ntervalStateProvider]: Interval conversion did not stabilize in 11 iterations. Over-approximation may be very coarse. [2023-12-02 17:51:04,233 WARN L110 ntervalStateProvider]: Interval conversion did not stabilize in 11 iterations. Over-approximation may be very coarse. [2023-12-02 17:51:04,234 WARN L110 ntervalStateProvider]: Interval conversion did not stabilize in 11 iterations. Over-approximation may be very coarse. [2023-12-02 17:51:04,234 WARN L110 ntervalStateProvider]: Interval conversion did not stabilize in 11 iterations. Over-approximation may be very coarse. [2023-12-02 17:51:04,234 WARN L110 ntervalStateProvider]: Interval conversion did not stabilize in 11 iterations. Over-approximation may be very coarse. [2023-12-02 17:51:04,392 WARN L110 ntervalStateProvider]: Interval conversion did not stabilize in 9 iterations. Over-approximation may be very coarse. [2023-12-02 17:51:04,393 WARN L110 ntervalStateProvider]: Interval conversion did not stabilize in 9 iterations. Over-approximation may be very coarse. [2023-12-02 17:51:04,393 WARN L110 ntervalStateProvider]: Interval conversion did not stabilize in 9 iterations. Over-approximation may be very coarse. [2023-12-02 17:51:04,393 WARN L110 ntervalStateProvider]: Interval conversion did not stabilize in 9 iterations. Over-approximation may be very coarse. [2023-12-02 17:51:04,462 WARN L110 ntervalStateProvider]: Interval conversion did not stabilize in 10 iterations. Over-approximation may be very coarse. [2023-12-02 17:51:04,463 WARN L110 ntervalStateProvider]: Interval conversion did not stabilize in 10 iterations. Over-approximation may be very coarse. [2023-12-02 17:51:04,463 WARN L110 ntervalStateProvider]: Interval conversion did not stabilize in 10 iterations. Over-approximation may be very coarse. [2023-12-02 17:51:04,463 WARN L110 ntervalStateProvider]: Interval conversion did not stabilize in 10 iterations. Over-approximation may be very coarse. [2023-12-02 17:51:04,473 WARN L110 ntervalStateProvider]: Interval conversion did not stabilize in 10 iterations. Over-approximation may be very coarse. [2023-12-02 17:51:04,473 WARN L110 ntervalStateProvider]: Interval conversion did not stabilize in 10 iterations. Over-approximation may be very coarse. [2023-12-02 17:51:04,712 WARN L110 ntervalStateProvider]: Interval conversion did not stabilize in 9 iterations. Over-approximation may be very coarse. [2023-12-02 17:51:04,712 WARN L110 ntervalStateProvider]: Interval conversion did not stabilize in 9 iterations. Over-approximation may be very coarse. [2023-12-02 17:51:04,791 WARN L110 ntervalStateProvider]: Interval conversion did not stabilize in 10 iterations. Over-approximation may be very coarse. [2023-12-02 17:51:04,791 WARN L110 ntervalStateProvider]: Interval conversion did not stabilize in 10 iterations. Over-approximation may be very coarse. [2023-12-02 17:51:11,172 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 8 for LOIs [2023-12-02 17:51:11,176 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 64 for LOIs [2023-12-02 17:51:11,199 INFO L180 IcfgInterpreter]: Interpretation finished [2023-12-02 17:51:23,991 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '99651#(and (<= 1 |#StackHeapBarrier|) (<= 1 ~counter~0) (= |__VERIFIER_assert_#in~cond| 0) (= __VERIFIER_assert_~cond 0) (<= ~counter~0 20))' at error location [2023-12-02 17:51:23,991 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-12-02 17:51:23,991 INFO L185 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2023-12-02 17:51:23,991 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 15] total 29 [2023-12-02 17:51:23,992 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [138130280] [2023-12-02 17:51:23,992 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2023-12-02 17:51:23,992 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 29 states [2023-12-02 17:51:23,992 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 17:51:23,993 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 29 interpolants. [2023-12-02 17:51:23,993 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=277, Invalid=2585, Unknown=0, NotChecked=0, Total=2862 [2023-12-02 17:51:23,993 INFO L87 Difference]: Start difference. First operand 4129 states and 5425 transitions. Second operand has 29 states, 26 states have (on average 2.576923076923077) internal successors, (67), 26 states have internal predecessors, (67), 10 states have call successors, (29), 3 states have call predecessors, (29), 2 states have return successors, (28), 8 states have call predecessors, (28), 8 states have call successors, (28) [2023-12-02 17:51:31,585 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.72s for a HTC check with result INVALID. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2023-12-02 17:51:42,695 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 17:52:41,786 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 17:52:41,786 INFO L93 Difference]: Finished difference Result 7082 states and 9413 transitions. [2023-12-02 17:52:41,787 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 76 states. [2023-12-02 17:52:41,787 INFO L78 Accepts]: Start accepts. Automaton has has 29 states, 26 states have (on average 2.576923076923077) internal successors, (67), 26 states have internal predecessors, (67), 10 states have call successors, (29), 3 states have call predecessors, (29), 2 states have return successors, (28), 8 states have call predecessors, (28), 8 states have call successors, (28) Word has length 99 [2023-12-02 17:52:41,787 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 17:52:41,804 INFO L225 Difference]: With dead ends: 7082 [2023-12-02 17:52:41,805 INFO L226 Difference]: Without dead ends: 5295 [2023-12-02 17:52:41,811 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 363 GetRequests, 243 SyntacticMatches, 0 SemanticMatches, 120 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4444 ImplicationChecksByTransitivity, 72.9s TimeCoverageRelationStatistics Valid=1890, Invalid=12872, Unknown=0, NotChecked=0, Total=14762 [2023-12-02 17:52:41,811 INFO L413 NwaCegarLoop]: 62 mSDtfsCounter, 375 mSDsluCounter, 933 mSDsCounter, 0 mSdLazyCounter, 890 mSolverCounterSat, 319 mSolverCounterUnsat, 1 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 13.7s Time, 0 mProtectedPredicate, 0 mProtectedAction, 383 SdHoareTripleChecker+Valid, 995 SdHoareTripleChecker+Invalid, 1210 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 319 IncrementalHoareTripleChecker+Valid, 890 IncrementalHoareTripleChecker+Invalid, 1 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 13.8s IncrementalHoareTripleChecker+Time [2023-12-02 17:52:41,812 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [383 Valid, 995 Invalid, 1210 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [319 Valid, 890 Invalid, 1 Unknown, 0 Unchecked, 13.8s Time] [2023-12-02 17:52:41,817 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 5295 states. [2023-12-02 17:52:45,924 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 5295 to 4427. [2023-12-02 17:52:45,927 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 4427 states, 3055 states have (on average 1.2013093289689034) internal successors, (3670), 3078 states have internal predecessors, (3670), 1089 states have call successors, (1089), 282 states have call predecessors, (1089), 282 states have return successors, (1078), 1066 states have call predecessors, (1078), 1078 states have call successors, (1078) [2023-12-02 17:52:45,937 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 4427 states to 4427 states and 5837 transitions. [2023-12-02 17:52:45,937 INFO L78 Accepts]: Start accepts. Automaton has 4427 states and 5837 transitions. Word has length 99 [2023-12-02 17:52:45,937 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 17:52:45,937 INFO L495 AbstractCegarLoop]: Abstraction has 4427 states and 5837 transitions. [2023-12-02 17:52:45,938 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 29 states, 26 states have (on average 2.576923076923077) internal successors, (67), 26 states have internal predecessors, (67), 10 states have call successors, (29), 3 states have call predecessors, (29), 2 states have return successors, (28), 8 states have call predecessors, (28), 8 states have call successors, (28) [2023-12-02 17:52:45,938 INFO L276 IsEmpty]: Start isEmpty. Operand 4427 states and 5837 transitions. [2023-12-02 17:52:45,940 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 115 [2023-12-02 17:52:45,940 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 17:52:45,940 INFO L195 NwaCegarLoop]: trace histogram [15, 14, 14, 4, 4, 4, 4, 4, 4, 4, 4, 4, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-12-02 17:52:45,946 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9baea50c-125b-415c-97d3-07da8d4dc433/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (27)] Ended with exit code 0 [2023-12-02 17:52:46,141 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 27 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9baea50c-125b-415c-97d3-07da8d4dc433/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable25 [2023-12-02 17:52:46,141 INFO L420 AbstractCegarLoop]: === Iteration 27 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 17:52:46,141 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 17:52:46,141 INFO L85 PathProgramCache]: Analyzing trace with hash -90675194, now seen corresponding path program 1 times [2023-12-02 17:52:46,141 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 17:52:46,142 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [663532725] [2023-12-02 17:52:46,142 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 17:52:46,142 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 17:52:46,150 ERROR L246 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2023-12-02 17:52:46,150 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [697993053] [2023-12-02 17:52:46,150 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 17:52:46,150 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 17:52:46,150 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9baea50c-125b-415c-97d3-07da8d4dc433/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 17:52:46,151 INFO L229 MonitoredProcess]: Starting monitored process 28 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9baea50c-125b-415c-97d3-07da8d4dc433/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 17:52:46,152 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9baea50c-125b-415c-97d3-07da8d4dc433/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (28)] Waiting until timeout for monitored process [2023-12-02 17:52:46,224 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 17:52:46,226 INFO L262 TraceCheckSpWp]: Trace formula consists of 293 conjuncts, 35 conjunts are in the unsatisfiable core [2023-12-02 17:52:46,228 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 17:52:46,474 INFO L134 CoverageAnalysis]: Checked inductivity of 452 backedges. 47 proven. 34 refuted. 0 times theorem prover too weak. 371 trivial. 0 not checked. [2023-12-02 17:52:46,474 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-12-02 17:52:47,510 INFO L134 CoverageAnalysis]: Checked inductivity of 452 backedges. 63 proven. 17 refuted. 0 times theorem prover too weak. 372 trivial. 0 not checked. [2023-12-02 17:52:47,510 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 17:52:47,511 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [663532725] [2023-12-02 17:52:47,511 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2023-12-02 17:52:47,511 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [697993053] [2023-12-02 17:52:47,511 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [697993053] provided 0 perfect and 2 imperfect interpolant sequences [2023-12-02 17:52:47,511 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1048948269] [2023-12-02 17:52:47,512 INFO L159 IcfgInterpreter]: Started Sifa with 27 locations of interest [2023-12-02 17:52:47,512 INFO L166 IcfgInterpreter]: Building call graph [2023-12-02 17:52:47,512 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-12-02 17:52:47,512 INFO L176 IcfgInterpreter]: Starting interpretation [2023-12-02 17:52:47,512 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-12-02 17:52:54,115 WARN L110 ntervalStateProvider]: Interval conversion did not stabilize in 14 iterations. Over-approximation may be very coarse. [2023-12-02 17:52:54,116 WARN L110 ntervalStateProvider]: Interval conversion did not stabilize in 14 iterations. Over-approximation may be very coarse. [2023-12-02 17:52:54,116 WARN L110 ntervalStateProvider]: Interval conversion did not stabilize in 14 iterations. Over-approximation may be very coarse. [2023-12-02 17:52:54,116 WARN L110 ntervalStateProvider]: Interval conversion did not stabilize in 14 iterations. Over-approximation may be very coarse. [2023-12-02 17:52:54,194 WARN L110 ntervalStateProvider]: Interval conversion did not stabilize in 14 iterations. Over-approximation may be very coarse. [2023-12-02 17:52:54,194 WARN L110 ntervalStateProvider]: Interval conversion did not stabilize in 14 iterations. Over-approximation may be very coarse. [2023-12-02 17:52:54,195 WARN L110 ntervalStateProvider]: Interval conversion did not stabilize in 14 iterations. Over-approximation may be very coarse. [2023-12-02 17:52:54,195 WARN L110 ntervalStateProvider]: Interval conversion did not stabilize in 14 iterations. Over-approximation may be very coarse. [2023-12-02 17:52:54,538 WARN L110 ntervalStateProvider]: Interval conversion did not stabilize in 13 iterations. Over-approximation may be very coarse. [2023-12-02 17:52:54,539 WARN L110 ntervalStateProvider]: Interval conversion did not stabilize in 13 iterations. Over-approximation may be very coarse. [2023-12-02 17:52:54,539 WARN L110 ntervalStateProvider]: Interval conversion did not stabilize in 13 iterations. Over-approximation may be very coarse. [2023-12-02 17:52:54,539 WARN L110 ntervalStateProvider]: Interval conversion did not stabilize in 13 iterations. Over-approximation may be very coarse. [2023-12-02 17:52:54,787 WARN L110 ntervalStateProvider]: Interval conversion did not stabilize in 13 iterations. Over-approximation may be very coarse. [2023-12-02 17:52:54,787 WARN L110 ntervalStateProvider]: Interval conversion did not stabilize in 13 iterations. Over-approximation may be very coarse. [2023-12-02 17:52:54,788 WARN L110 ntervalStateProvider]: Interval conversion did not stabilize in 13 iterations. Over-approximation may be very coarse. [2023-12-02 17:52:54,788 WARN L110 ntervalStateProvider]: Interval conversion did not stabilize in 13 iterations. Over-approximation may be very coarse. [2023-12-02 17:52:54,897 WARN L110 ntervalStateProvider]: Interval conversion did not stabilize in 13 iterations. Over-approximation may be very coarse. [2023-12-02 17:52:54,897 WARN L110 ntervalStateProvider]: Interval conversion did not stabilize in 13 iterations. Over-approximation may be very coarse. [2023-12-02 17:52:54,898 WARN L110 ntervalStateProvider]: Interval conversion did not stabilize in 13 iterations. Over-approximation may be very coarse. [2023-12-02 17:52:54,898 WARN L110 ntervalStateProvider]: Interval conversion did not stabilize in 13 iterations. Over-approximation may be very coarse. [2023-12-02 17:52:55,006 WARN L110 ntervalStateProvider]: Interval conversion did not stabilize in 14 iterations. Over-approximation may be very coarse. [2023-12-02 17:52:55,006 WARN L110 ntervalStateProvider]: Interval conversion did not stabilize in 14 iterations. Over-approximation may be very coarse. [2023-12-02 17:52:55,007 WARN L110 ntervalStateProvider]: Interval conversion did not stabilize in 14 iterations. Over-approximation may be very coarse. [2023-12-02 17:52:55,007 WARN L110 ntervalStateProvider]: Interval conversion did not stabilize in 14 iterations. Over-approximation may be very coarse. [2023-12-02 17:52:55,021 WARN L110 ntervalStateProvider]: Interval conversion did not stabilize in 14 iterations. Over-approximation may be very coarse. [2023-12-02 17:52:55,021 WARN L110 ntervalStateProvider]: Interval conversion did not stabilize in 14 iterations. Over-approximation may be very coarse. [2023-12-02 17:52:55,022 WARN L110 ntervalStateProvider]: Interval conversion did not stabilize in 14 iterations. Over-approximation may be very coarse. [2023-12-02 17:52:55,022 WARN L110 ntervalStateProvider]: Interval conversion did not stabilize in 14 iterations. Over-approximation may be very coarse. [2023-12-02 17:52:55,180 WARN L110 ntervalStateProvider]: Interval conversion did not stabilize in 9 iterations. Over-approximation may be very coarse. [2023-12-02 17:52:55,196 WARN L110 ntervalStateProvider]: Interval conversion did not stabilize in 9 iterations. Over-approximation may be very coarse. [2023-12-02 17:52:55,197 WARN L110 ntervalStateProvider]: Interval conversion did not stabilize in 9 iterations. Over-approximation may be very coarse. [2023-12-02 17:52:55,197 WARN L110 ntervalStateProvider]: Interval conversion did not stabilize in 9 iterations. Over-approximation may be very coarse. [2023-12-02 17:52:55,267 WARN L110 ntervalStateProvider]: Interval conversion did not stabilize in 10 iterations. Over-approximation may be very coarse. [2023-12-02 17:52:55,267 WARN L110 ntervalStateProvider]: Interval conversion did not stabilize in 10 iterations. Over-approximation may be very coarse. [2023-12-02 17:52:55,267 WARN L110 ntervalStateProvider]: Interval conversion did not stabilize in 10 iterations. Over-approximation may be very coarse. [2023-12-02 17:52:55,268 WARN L110 ntervalStateProvider]: Interval conversion did not stabilize in 10 iterations. Over-approximation may be very coarse. [2023-12-02 17:52:55,298 WARN L110 ntervalStateProvider]: Interval conversion did not stabilize in 10 iterations. Over-approximation may be very coarse. [2023-12-02 17:52:55,298 WARN L110 ntervalStateProvider]: Interval conversion did not stabilize in 10 iterations. Over-approximation may be very coarse. [2023-12-02 17:52:55,535 WARN L110 ntervalStateProvider]: Interval conversion did not stabilize in 9 iterations. Over-approximation may be very coarse. [2023-12-02 17:52:55,535 WARN L110 ntervalStateProvider]: Interval conversion did not stabilize in 9 iterations. Over-approximation may be very coarse. [2023-12-02 17:52:55,597 WARN L110 ntervalStateProvider]: Interval conversion did not stabilize in 10 iterations. Over-approximation may be very coarse. [2023-12-02 17:52:55,598 WARN L110 ntervalStateProvider]: Interval conversion did not stabilize in 10 iterations. Over-approximation may be very coarse. [2023-12-02 17:53:02,256 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 9 for LOIs [2023-12-02 17:53:02,261 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 64 for LOIs [2023-12-02 17:53:02,280 INFO L180 IcfgInterpreter]: Interpretation finished [2023-12-02 17:53:04,109 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '117250#(and (<= 1 |#StackHeapBarrier|) (= |__VERIFIER_assert_#in~cond| 0) (= __VERIFIER_assert_~cond 0) (<= ~counter~0 20) (<= 3 ~counter~0))' at error location [2023-12-02 17:53:04,109 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-12-02 17:53:04,109 INFO L185 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2023-12-02 17:53:04,109 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 10] total 21 [2023-12-02 17:53:04,109 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [300074138] [2023-12-02 17:53:04,109 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2023-12-02 17:53:04,110 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 21 states [2023-12-02 17:53:04,110 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 17:53:04,110 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2023-12-02 17:53:04,110 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=197, Invalid=1695, Unknown=0, NotChecked=0, Total=1892 [2023-12-02 17:53:04,111 INFO L87 Difference]: Start difference. First operand 4427 states and 5837 transitions. Second operand has 21 states, 20 states have (on average 3.1) internal successors, (62), 18 states have internal predecessors, (62), 9 states have call successors, (33), 3 states have call predecessors, (33), 2 states have return successors, (32), 9 states have call predecessors, (32), 9 states have call successors, (32) [2023-12-02 17:53:13,966 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 17:53:13,966 INFO L93 Difference]: Finished difference Result 9212 states and 12715 transitions. [2023-12-02 17:53:13,967 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 28 states. [2023-12-02 17:53:13,967 INFO L78 Accepts]: Start accepts. Automaton has has 21 states, 20 states have (on average 3.1) internal successors, (62), 18 states have internal predecessors, (62), 9 states have call successors, (33), 3 states have call predecessors, (33), 2 states have return successors, (32), 9 states have call predecessors, (32), 9 states have call successors, (32) Word has length 114 [2023-12-02 17:53:13,967 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 17:53:13,983 INFO L225 Difference]: With dead ends: 9212 [2023-12-02 17:53:13,983 INFO L226 Difference]: Without dead ends: 6765 [2023-12-02 17:53:13,988 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 378 GetRequests, 314 SyntacticMatches, 0 SemanticMatches, 64 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1115 ImplicationChecksByTransitivity, 3.5s TimeCoverageRelationStatistics Valid=513, Invalid=3777, Unknown=0, NotChecked=0, Total=4290 [2023-12-02 17:53:13,988 INFO L413 NwaCegarLoop]: 51 mSDtfsCounter, 209 mSDsluCounter, 489 mSDsCounter, 0 mSdLazyCounter, 401 mSolverCounterSat, 131 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.8s Time, 0 mProtectedPredicate, 0 mProtectedAction, 213 SdHoareTripleChecker+Valid, 540 SdHoareTripleChecker+Invalid, 532 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 131 IncrementalHoareTripleChecker+Valid, 401 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.8s IncrementalHoareTripleChecker+Time [2023-12-02 17:53:13,989 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [213 Valid, 540 Invalid, 532 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [131 Valid, 401 Invalid, 0 Unknown, 0 Unchecked, 0.8s Time] [2023-12-02 17:53:13,994 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 6765 states. [2023-12-02 17:53:22,758 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 6765 to 6460. [2023-12-02 17:53:22,762 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 6460 states, 4095 states have (on average 1.2356532356532357) internal successors, (5060), 4117 states have internal predecessors, (5060), 2049 states have call successors, (2049), 316 states have call predecessors, (2049), 315 states have return successors, (2039), 2026 states have call predecessors, (2039), 2039 states have call successors, (2039) [2023-12-02 17:53:22,777 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 6460 states to 6460 states and 9148 transitions. [2023-12-02 17:53:22,777 INFO L78 Accepts]: Start accepts. Automaton has 6460 states and 9148 transitions. Word has length 114 [2023-12-02 17:53:22,777 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 17:53:22,778 INFO L495 AbstractCegarLoop]: Abstraction has 6460 states and 9148 transitions. [2023-12-02 17:53:22,778 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 21 states, 20 states have (on average 3.1) internal successors, (62), 18 states have internal predecessors, (62), 9 states have call successors, (33), 3 states have call predecessors, (33), 2 states have return successors, (32), 9 states have call predecessors, (32), 9 states have call successors, (32) [2023-12-02 17:53:22,778 INFO L276 IsEmpty]: Start isEmpty. Operand 6460 states and 9148 transitions. [2023-12-02 17:53:22,780 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 117 [2023-12-02 17:53:22,780 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 17:53:22,780 INFO L195 NwaCegarLoop]: trace histogram [14, 13, 13, 5, 5, 4, 4, 4, 4, 4, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-12-02 17:53:22,785 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9baea50c-125b-415c-97d3-07da8d4dc433/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (28)] Ended with exit code 0 [2023-12-02 17:53:22,980 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 28 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9baea50c-125b-415c-97d3-07da8d4dc433/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable26 [2023-12-02 17:53:22,980 INFO L420 AbstractCegarLoop]: === Iteration 28 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 17:53:22,981 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 17:53:22,981 INFO L85 PathProgramCache]: Analyzing trace with hash 147966679, now seen corresponding path program 2 times [2023-12-02 17:53:22,981 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 17:53:22,981 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1959562632] [2023-12-02 17:53:22,981 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 17:53:22,981 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 17:53:22,989 ERROR L246 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2023-12-02 17:53:22,989 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1168748564] [2023-12-02 17:53:22,989 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2023-12-02 17:53:22,990 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 17:53:22,990 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9baea50c-125b-415c-97d3-07da8d4dc433/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 17:53:22,990 INFO L229 MonitoredProcess]: Starting monitored process 29 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9baea50c-125b-415c-97d3-07da8d4dc433/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 17:53:22,991 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9baea50c-125b-415c-97d3-07da8d4dc433/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (29)] Waiting until timeout for monitored process [2023-12-02 17:53:23,136 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2023-12-02 17:53:23,136 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-12-02 17:53:23,138 INFO L262 TraceCheckSpWp]: Trace formula consists of 240 conjuncts, 84 conjunts are in the unsatisfiable core [2023-12-02 17:53:23,141 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 17:53:24,859 INFO L134 CoverageAnalysis]: Checked inductivity of 414 backedges. 62 proven. 75 refuted. 0 times theorem prover too weak. 277 trivial. 0 not checked. [2023-12-02 17:53:24,859 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-12-02 17:53:33,727 INFO L134 CoverageAnalysis]: Checked inductivity of 414 backedges. 62 proven. 74 refuted. 0 times theorem prover too weak. 278 trivial. 0 not checked. [2023-12-02 17:53:33,728 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 17:53:33,728 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1959562632] [2023-12-02 17:53:33,728 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2023-12-02 17:53:33,728 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1168748564] [2023-12-02 17:53:33,728 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1168748564] provided 0 perfect and 2 imperfect interpolant sequences [2023-12-02 17:53:33,728 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1872713865] [2023-12-02 17:53:33,729 INFO L159 IcfgInterpreter]: Started Sifa with 27 locations of interest [2023-12-02 17:53:33,730 INFO L166 IcfgInterpreter]: Building call graph [2023-12-02 17:53:33,730 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-12-02 17:53:33,730 INFO L176 IcfgInterpreter]: Starting interpretation [2023-12-02 17:53:33,730 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-12-02 17:53:48,993 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 9 for LOIs [2023-12-02 17:53:48,999 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 64 for LOIs [2023-12-02 17:53:49,020 INFO L180 IcfgInterpreter]: Interpretation finished [2023-12-02 17:53:58,878 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '141459#(and (<= 1 |#StackHeapBarrier|) (= |__VERIFIER_assert_#in~cond| 0) (= __VERIFIER_assert_~cond 0) (<= ~counter~0 20) (<= 3 ~counter~0))' at error location [2023-12-02 17:53:58,879 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-12-02 17:53:58,879 INFO L185 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2023-12-02 17:53:58,879 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [22, 18] total 37 [2023-12-02 17:53:58,879 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [109532898] [2023-12-02 17:53:58,879 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2023-12-02 17:53:58,880 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 37 states [2023-12-02 17:53:58,880 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 17:53:58,880 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 37 interpolants. [2023-12-02 17:53:58,881 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=380, Invalid=3159, Unknown=1, NotChecked=0, Total=3540 [2023-12-02 17:53:58,881 INFO L87 Difference]: Start difference. First operand 6460 states and 9148 transitions. Second operand has 37 states, 34 states have (on average 2.823529411764706) internal successors, (96), 33 states have internal predecessors, (96), 11 states have call successors, (30), 3 states have call predecessors, (30), 3 states have return successors, (29), 10 states have call predecessors, (29), 9 states have call successors, (29) [2023-12-02 17:54:06,586 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 17:54:20,092 WARN L293 SmtUtils]: Spent 9.61s on a formula simplification that was a NOOP. DAG size: 100 (called from [L 391] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2023-12-02 17:54:33,506 WARN L293 SmtUtils]: Spent 7.14s on a formula simplification that was a NOOP. DAG size: 118 (called from [L 391] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2023-12-02 17:54:35,892 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2023-12-02 17:54:42,374 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.05s for a HTC check with result VALID. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2023-12-02 17:54:45,147 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2023-12-02 17:55:02,522 WARN L293 SmtUtils]: Spent 8.60s on a formula simplification that was a NOOP. DAG size: 116 (called from [L 391] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2023-12-02 17:55:19,876 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.39s for a HTC check with result INVALID. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2023-12-02 17:55:26,878 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2023-12-02 17:55:38,758 WARN L539 Checker$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 17:55:42,869 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.16s for a HTC check with result INVALID. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2023-12-02 17:55:48,837 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 17:55:48,837 INFO L93 Difference]: Finished difference Result 7634 states and 10629 transitions. [2023-12-02 17:55:48,837 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 76 states. [2023-12-02 17:55:48,837 INFO L78 Accepts]: Start accepts. Automaton has has 37 states, 34 states have (on average 2.823529411764706) internal successors, (96), 33 states have internal predecessors, (96), 11 states have call successors, (30), 3 states have call predecessors, (30), 3 states have return successors, (29), 10 states have call predecessors, (29), 9 states have call successors, (29) Word has length 116 [2023-12-02 17:55:48,838 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 17:55:48,862 INFO L225 Difference]: With dead ends: 7634 [2023-12-02 17:55:48,862 INFO L226 Difference]: Without dead ends: 7628 [2023-12-02 17:55:48,866 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 412 GetRequests, 288 SyntacticMatches, 0 SemanticMatches, 124 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5122 ImplicationChecksByTransitivity, 85.2s TimeCoverageRelationStatistics Valid=2501, Invalid=13248, Unknown=1, NotChecked=0, Total=15750 [2023-12-02 17:55:48,866 INFO L413 NwaCegarLoop]: 78 mSDtfsCounter, 579 mSDsluCounter, 1528 mSDsCounter, 0 mSdLazyCounter, 1295 mSolverCounterSat, 364 mSolverCounterUnsat, 5 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 26.8s Time, 0 mProtectedPredicate, 0 mProtectedAction, 579 SdHoareTripleChecker+Valid, 1606 SdHoareTripleChecker+Invalid, 1664 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 364 IncrementalHoareTripleChecker+Valid, 1295 IncrementalHoareTripleChecker+Invalid, 5 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 26.9s IncrementalHoareTripleChecker+Time [2023-12-02 17:55:48,866 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [579 Valid, 1606 Invalid, 1664 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [364 Valid, 1295 Invalid, 5 Unknown, 0 Unchecked, 26.9s Time] [2023-12-02 17:55:48,874 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 7628 states. [2023-12-02 17:55:59,293 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 7628 to 7284. [2023-12-02 17:55:59,298 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 7284 states, 4725 states have (on average 1.2338624338624338) internal successors, (5830), 4762 states have internal predecessors, (5830), 2202 states have call successors, (2202), 357 states have call predecessors, (2202), 356 states have return successors, (2194), 2164 states have call predecessors, (2194), 2194 states have call successors, (2194) [2023-12-02 17:55:59,314 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 7284 states to 7284 states and 10226 transitions. [2023-12-02 17:55:59,315 INFO L78 Accepts]: Start accepts. Automaton has 7284 states and 10226 transitions. Word has length 116 [2023-12-02 17:55:59,315 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 17:55:59,315 INFO L495 AbstractCegarLoop]: Abstraction has 7284 states and 10226 transitions. [2023-12-02 17:55:59,315 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 37 states, 34 states have (on average 2.823529411764706) internal successors, (96), 33 states have internal predecessors, (96), 11 states have call successors, (30), 3 states have call predecessors, (30), 3 states have return successors, (29), 10 states have call predecessors, (29), 9 states have call successors, (29) [2023-12-02 17:55:59,315 INFO L276 IsEmpty]: Start isEmpty. Operand 7284 states and 10226 transitions. [2023-12-02 17:55:59,317 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 130 [2023-12-02 17:55:59,317 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 17:55:59,318 INFO L195 NwaCegarLoop]: trace histogram [17, 16, 16, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-12-02 17:55:59,323 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9baea50c-125b-415c-97d3-07da8d4dc433/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (29)] Ended with exit code 0 [2023-12-02 17:55:59,518 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 29 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9baea50c-125b-415c-97d3-07da8d4dc433/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable27 [2023-12-02 17:55:59,518 INFO L420 AbstractCegarLoop]: === Iteration 29 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 17:55:59,518 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 17:55:59,518 INFO L85 PathProgramCache]: Analyzing trace with hash 1231186783, now seen corresponding path program 3 times [2023-12-02 17:55:59,519 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 17:55:59,519 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [210219410] [2023-12-02 17:55:59,519 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 17:55:59,519 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 17:55:59,528 ERROR L246 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2023-12-02 17:55:59,528 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [351537863] [2023-12-02 17:55:59,528 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2023-12-02 17:55:59,528 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 17:55:59,528 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9baea50c-125b-415c-97d3-07da8d4dc433/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 17:55:59,529 INFO L229 MonitoredProcess]: Starting monitored process 30 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9baea50c-125b-415c-97d3-07da8d4dc433/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 17:55:59,531 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9baea50c-125b-415c-97d3-07da8d4dc433/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (30)] Waiting until timeout for monitored process [2023-12-02 17:55:59,606 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2023-12-02 17:55:59,606 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-12-02 17:55:59,608 INFO L262 TraceCheckSpWp]: Trace formula consists of 295 conjuncts, 86 conjunts are in the unsatisfiable core [2023-12-02 17:55:59,612 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 17:56:01,285 INFO L134 CoverageAnalysis]: Checked inductivity of 585 backedges. 70 proven. 79 refuted. 0 times theorem prover too weak. 436 trivial. 0 not checked. [2023-12-02 17:56:01,285 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-12-02 17:56:15,078 INFO L134 CoverageAnalysis]: Checked inductivity of 585 backedges. 70 proven. 78 refuted. 0 times theorem prover too weak. 437 trivial. 0 not checked. [2023-12-02 17:56:15,079 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 17:56:15,079 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [210219410] [2023-12-02 17:56:15,079 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2023-12-02 17:56:15,079 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [351537863] [2023-12-02 17:56:15,079 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [351537863] provided 0 perfect and 2 imperfect interpolant sequences [2023-12-02 17:56:15,079 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1991212774] [2023-12-02 17:56:15,080 INFO L159 IcfgInterpreter]: Started Sifa with 28 locations of interest [2023-12-02 17:56:15,080 INFO L166 IcfgInterpreter]: Building call graph [2023-12-02 17:56:15,080 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-12-02 17:56:15,081 INFO L176 IcfgInterpreter]: Starting interpretation [2023-12-02 17:56:15,081 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-12-02 17:56:21,674 WARN L110 ntervalStateProvider]: Interval conversion did not stabilize in 14 iterations. Over-approximation may be very coarse. [2023-12-02 17:56:21,675 WARN L110 ntervalStateProvider]: Interval conversion did not stabilize in 14 iterations. Over-approximation may be very coarse. [2023-12-02 17:56:21,730 WARN L110 ntervalStateProvider]: Interval conversion did not stabilize in 14 iterations. Over-approximation may be very coarse. [2023-12-02 17:56:21,730 WARN L110 ntervalStateProvider]: Interval conversion did not stabilize in 14 iterations. Over-approximation may be very coarse. [2023-12-02 17:56:21,817 WARN L110 ntervalStateProvider]: Interval conversion did not stabilize in 14 iterations. Over-approximation may be very coarse. [2023-12-02 17:56:21,818 WARN L110 ntervalStateProvider]: Interval conversion did not stabilize in 14 iterations. Over-approximation may be very coarse. [2023-12-02 17:56:21,888 WARN L110 ntervalStateProvider]: Interval conversion did not stabilize in 14 iterations. Over-approximation may be very coarse. [2023-12-02 17:56:21,889 WARN L110 ntervalStateProvider]: Interval conversion did not stabilize in 14 iterations. Over-approximation may be very coarse. [2023-12-02 17:56:21,959 WARN L110 ntervalStateProvider]: Interval conversion did not stabilize in 14 iterations. Over-approximation may be very coarse. [2023-12-02 17:56:21,960 WARN L110 ntervalStateProvider]: Interval conversion did not stabilize in 14 iterations. Over-approximation may be very coarse. [2023-12-02 17:56:22,024 WARN L110 ntervalStateProvider]: Interval conversion did not stabilize in 14 iterations. Over-approximation may be very coarse. [2023-12-02 17:56:22,024 WARN L110 ntervalStateProvider]: Interval conversion did not stabilize in 14 iterations. Over-approximation may be very coarse. [2023-12-02 17:56:22,037 WARN L110 ntervalStateProvider]: Interval conversion did not stabilize in 14 iterations. Over-approximation may be very coarse. [2023-12-02 17:56:22,038 WARN L110 ntervalStateProvider]: Interval conversion did not stabilize in 14 iterations. Over-approximation may be very coarse. [2023-12-02 17:56:22,215 WARN L110 ntervalStateProvider]: Interval conversion did not stabilize in 12 iterations. Over-approximation may be very coarse. [2023-12-02 17:56:22,216 WARN L110 ntervalStateProvider]: Interval conversion did not stabilize in 12 iterations. Over-approximation may be very coarse. [2023-12-02 17:56:22,216 WARN L110 ntervalStateProvider]: Interval conversion did not stabilize in 12 iterations. Over-approximation may be very coarse. [2023-12-02 17:56:22,216 WARN L110 ntervalStateProvider]: Interval conversion did not stabilize in 12 iterations. Over-approximation may be very coarse. [2023-12-02 17:56:22,367 WARN L110 ntervalStateProvider]: Interval conversion did not stabilize in 12 iterations. Over-approximation may be very coarse. [2023-12-02 17:56:22,367 WARN L110 ntervalStateProvider]: Interval conversion did not stabilize in 12 iterations. Over-approximation may be very coarse. [2023-12-02 17:56:22,367 WARN L110 ntervalStateProvider]: Interval conversion did not stabilize in 12 iterations. Over-approximation may be very coarse. [2023-12-02 17:56:22,368 WARN L110 ntervalStateProvider]: Interval conversion did not stabilize in 12 iterations. Over-approximation may be very coarse. [2023-12-02 17:56:22,500 WARN L110 ntervalStateProvider]: Interval conversion did not stabilize in 12 iterations. Over-approximation may be very coarse. [2023-12-02 17:56:22,500 WARN L110 ntervalStateProvider]: Interval conversion did not stabilize in 12 iterations. Over-approximation may be very coarse. [2023-12-02 17:56:22,501 WARN L110 ntervalStateProvider]: Interval conversion did not stabilize in 12 iterations. Over-approximation may be very coarse. [2023-12-02 17:56:22,501 WARN L110 ntervalStateProvider]: Interval conversion did not stabilize in 12 iterations. Over-approximation may be very coarse. [2023-12-02 17:56:22,628 WARN L110 ntervalStateProvider]: Interval conversion did not stabilize in 13 iterations. Over-approximation may be very coarse. [2023-12-02 17:56:22,628 WARN L110 ntervalStateProvider]: Interval conversion did not stabilize in 13 iterations. Over-approximation may be very coarse. [2023-12-02 17:56:22,629 WARN L110 ntervalStateProvider]: Interval conversion did not stabilize in 13 iterations. Over-approximation may be very coarse. [2023-12-02 17:56:22,629 WARN L110 ntervalStateProvider]: Interval conversion did not stabilize in 13 iterations. Over-approximation may be very coarse. [2023-12-02 17:56:22,649 WARN L110 ntervalStateProvider]: Interval conversion did not stabilize in 14 iterations. Over-approximation may be very coarse. [2023-12-02 17:56:22,650 WARN L110 ntervalStateProvider]: Interval conversion did not stabilize in 14 iterations. Over-approximation may be very coarse. [2023-12-02 17:56:22,650 WARN L110 ntervalStateProvider]: Interval conversion did not stabilize in 13 iterations. Over-approximation may be very coarse. [2023-12-02 17:56:22,650 WARN L110 ntervalStateProvider]: Interval conversion did not stabilize in 13 iterations. Over-approximation may be very coarse. [2023-12-02 17:56:22,914 WARN L110 ntervalStateProvider]: Interval conversion did not stabilize in 12 iterations. Over-approximation may be very coarse. [2023-12-02 17:56:22,914 WARN L110 ntervalStateProvider]: Interval conversion did not stabilize in 12 iterations. Over-approximation may be very coarse. [2023-12-02 17:56:22,990 WARN L110 ntervalStateProvider]: Interval conversion did not stabilize in 13 iterations. Over-approximation may be very coarse. [2023-12-02 17:56:22,991 WARN L110 ntervalStateProvider]: Interval conversion did not stabilize in 13 iterations. Over-approximation may be very coarse. [2023-12-02 17:56:23,214 WARN L110 ntervalStateProvider]: Interval conversion did not stabilize in 14 iterations. Over-approximation may be very coarse. [2023-12-02 17:56:23,214 WARN L110 ntervalStateProvider]: Interval conversion did not stabilize in 14 iterations. Over-approximation may be very coarse. [2023-12-02 17:56:23,321 WARN L110 ntervalStateProvider]: Interval conversion did not stabilize in 14 iterations. Over-approximation may be very coarse. [2023-12-02 17:56:23,322 WARN L110 ntervalStateProvider]: Interval conversion did not stabilize in 14 iterations. Over-approximation may be very coarse. [2023-12-02 17:56:23,541 WARN L110 ntervalStateProvider]: Interval conversion did not stabilize in 13 iterations. Over-approximation may be very coarse. [2023-12-02 17:56:23,542 WARN L110 ntervalStateProvider]: Interval conversion did not stabilize in 13 iterations. Over-approximation may be very coarse. [2023-12-02 17:56:23,714 WARN L110 ntervalStateProvider]: Interval conversion did not stabilize in 13 iterations. Over-approximation may be very coarse. [2023-12-02 17:56:23,714 WARN L110 ntervalStateProvider]: Interval conversion did not stabilize in 13 iterations. Over-approximation may be very coarse. [2023-12-02 17:56:23,827 WARN L110 ntervalStateProvider]: Interval conversion did not stabilize in 13 iterations. Over-approximation may be very coarse. [2023-12-02 17:56:23,828 WARN L110 ntervalStateProvider]: Interval conversion did not stabilize in 13 iterations. Over-approximation may be very coarse. [2023-12-02 17:56:23,935 WARN L110 ntervalStateProvider]: Interval conversion did not stabilize in 14 iterations. Over-approximation may be very coarse. [2023-12-02 17:56:23,936 WARN L110 ntervalStateProvider]: Interval conversion did not stabilize in 14 iterations. Over-approximation may be very coarse. [2023-12-02 17:56:23,951 WARN L110 ntervalStateProvider]: Interval conversion did not stabilize in 14 iterations. Over-approximation may be very coarse. [2023-12-02 17:56:23,952 WARN L110 ntervalStateProvider]: Interval conversion did not stabilize in 14 iterations. Over-approximation may be very coarse. [2023-12-02 17:56:36,459 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 8 for LOIs [2023-12-02 17:56:36,464 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 64 for LOIs [2023-12-02 17:56:36,483 INFO L180 IcfgInterpreter]: Interpretation finished [2023-12-02 17:56:46,593 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '164743#(and (<= 1 |#StackHeapBarrier|) (<= 1 ~counter~0) (= |__VERIFIER_assert_#in~cond| 0) (= __VERIFIER_assert_~cond 0) (<= ~counter~0 20))' at error location [2023-12-02 17:56:46,593 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-12-02 17:56:46,593 INFO L185 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2023-12-02 17:56:46,594 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [22, 19] total 38 [2023-12-02 17:56:46,594 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1098055043] [2023-12-02 17:56:46,594 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2023-12-02 17:56:46,594 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 38 states [2023-12-02 17:56:46,594 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 17:56:46,595 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 38 interpolants. [2023-12-02 17:56:46,595 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=341, Invalid=3565, Unknown=0, NotChecked=0, Total=3906 [2023-12-02 17:56:46,596 INFO L87 Difference]: Start difference. First operand 7284 states and 10226 transitions. Second operand has 38 states, 35 states have (on average 2.6285714285714286) internal successors, (92), 34 states have internal predecessors, (92), 14 states have call successors, (37), 3 states have call predecessors, (37), 3 states have return successors, (36), 12 states have call predecessors, (36), 12 states have call successors, (36) [2023-12-02 17:58:47,172 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 17:58:47,173 INFO L93 Difference]: Finished difference Result 9238 states and 13061 transitions. [2023-12-02 17:58:47,173 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 114 states. [2023-12-02 17:58:47,173 INFO L78 Accepts]: Start accepts. Automaton has has 38 states, 35 states have (on average 2.6285714285714286) internal successors, (92), 34 states have internal predecessors, (92), 14 states have call successors, (37), 3 states have call predecessors, (37), 3 states have return successors, (36), 12 states have call predecessors, (36), 12 states have call successors, (36) Word has length 129 [2023-12-02 17:58:47,174 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 17:58:47,193 INFO L225 Difference]: With dead ends: 9238 [2023-12-02 17:58:47,193 INFO L226 Difference]: Without dead ends: 9197 [2023-12-02 17:58:47,196 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 492 GetRequests, 324 SyntacticMatches, 0 SemanticMatches, 168 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 9779 ImplicationChecksByTransitivity, 99.7s TimeCoverageRelationStatistics Valid=3998, Invalid=24732, Unknown=0, NotChecked=0, Total=28730 [2023-12-02 17:58:47,197 INFO L413 NwaCegarLoop]: 133 mSDtfsCounter, 663 mSDsluCounter, 2443 mSDsCounter, 0 mSdLazyCounter, 2322 mSolverCounterSat, 491 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 19.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 666 SdHoareTripleChecker+Valid, 2576 SdHoareTripleChecker+Invalid, 2813 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 491 IncrementalHoareTripleChecker+Valid, 2322 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 19.9s IncrementalHoareTripleChecker+Time [2023-12-02 17:58:47,197 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [666 Valid, 2576 Invalid, 2813 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [491 Valid, 2322 Invalid, 0 Unknown, 0 Unchecked, 19.9s Time] [2023-12-02 17:58:47,204 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 9197 states. [2023-12-02 17:59:01,336 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 9197 to 8354. [2023-12-02 17:59:01,340 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 8354 states, 5433 states have (on average 1.2357813362782992) internal successors, (6714), 5470 states have internal predecessors, (6714), 2534 states have call successors, (2534), 387 states have call predecessors, (2534), 386 states have return successors, (2526), 2496 states have call predecessors, (2526), 2526 states have call successors, (2526) [2023-12-02 17:59:01,358 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 8354 states to 8354 states and 11774 transitions. [2023-12-02 17:59:01,359 INFO L78 Accepts]: Start accepts. Automaton has 8354 states and 11774 transitions. Word has length 129 [2023-12-02 17:59:01,359 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 17:59:01,359 INFO L495 AbstractCegarLoop]: Abstraction has 8354 states and 11774 transitions. [2023-12-02 17:59:01,359 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 38 states, 35 states have (on average 2.6285714285714286) internal successors, (92), 34 states have internal predecessors, (92), 14 states have call successors, (37), 3 states have call predecessors, (37), 3 states have return successors, (36), 12 states have call predecessors, (36), 12 states have call successors, (36) [2023-12-02 17:59:01,359 INFO L276 IsEmpty]: Start isEmpty. Operand 8354 states and 11774 transitions. [2023-12-02 17:59:01,361 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 130 [2023-12-02 17:59:01,361 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 17:59:01,362 INFO L195 NwaCegarLoop]: trace histogram [17, 16, 16, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-12-02 17:59:01,366 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9baea50c-125b-415c-97d3-07da8d4dc433/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (30)] Ended with exit code 0 [2023-12-02 17:59:01,562 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 30 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9baea50c-125b-415c-97d3-07da8d4dc433/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable28 [2023-12-02 17:59:01,562 INFO L420 AbstractCegarLoop]: === Iteration 30 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 17:59:01,562 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 17:59:01,562 INFO L85 PathProgramCache]: Analyzing trace with hash 1316717847, now seen corresponding path program 4 times [2023-12-02 17:59:01,563 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 17:59:01,563 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1917393821] [2023-12-02 17:59:01,563 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 17:59:01,563 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 17:59:01,571 ERROR L246 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2023-12-02 17:59:01,571 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [403041794] [2023-12-02 17:59:01,571 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2023-12-02 17:59:01,572 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 17:59:01,572 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9baea50c-125b-415c-97d3-07da8d4dc433/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 17:59:01,573 INFO L229 MonitoredProcess]: Starting monitored process 31 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9baea50c-125b-415c-97d3-07da8d4dc433/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 17:59:01,573 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9baea50c-125b-415c-97d3-07da8d4dc433/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (31)] Waiting until timeout for monitored process [2023-12-02 17:59:01,657 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 17:59:01,660 INFO L262 TraceCheckSpWp]: Trace formula consists of 331 conjuncts, 88 conjunts are in the unsatisfiable core [2023-12-02 17:59:01,663 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 17:59:03,291 INFO L134 CoverageAnalysis]: Checked inductivity of 585 backedges. 70 proven. 79 refuted. 0 times theorem prover too weak. 436 trivial. 0 not checked. [2023-12-02 17:59:03,291 INFO L327 TraceCheckSpWp]: Computing backward predicates...