./Ultimate.py --spec ../../sv-benchmarks/c/properties/unreach-call.prp --file ../../sv-benchmarks/c/nla-digbench-scaling/egcd2-ll_unwindbound50.c --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for ERROR reachability Using default analysis Version 9bd2c7ff 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_ed8734f7-7f84-4268-847c-71b14fc12f5e/bin/utaipan-verify-t7M7D8N6sZ/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ed8734f7-7f84-4268-847c-71b14fc12f5e/bin/utaipan-verify-t7M7D8N6sZ/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ed8734f7-7f84-4268-847c-71b14fc12f5e/bin/utaipan-verify-t7M7D8N6sZ/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ed8734f7-7f84-4268-847c-71b14fc12f5e/bin/utaipan-verify-t7M7D8N6sZ/config/TaipanReach.xml -i ../../sv-benchmarks/c/nla-digbench-scaling/egcd2-ll_unwindbound50.c -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ed8734f7-7f84-4268-847c-71b14fc12f5e/bin/utaipan-verify-t7M7D8N6sZ/config/svcomp-Reach-32bit-Taipan_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ed8734f7-7f84-4268-847c-71b14fc12f5e/bin/utaipan-verify-t7M7D8N6sZ --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 deef9b1f63fa90bdeace0bbb769d25578ef53bda95c70ad5e444555427b2b0e2 --- Real Ultimate output --- This is Ultimate 0.2.3-dev-9bd2c7f [2023-11-19 04:57:16,990 INFO L188 SettingsManager]: Resetting all preferences to default values... [2023-11-19 04:57:17,106 INFO L114 SettingsManager]: Loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ed8734f7-7f84-4268-847c-71b14fc12f5e/bin/utaipan-verify-t7M7D8N6sZ/config/svcomp-Reach-32bit-Taipan_Default.epf [2023-11-19 04:57:17,113 WARN L101 SettingsManager]: Preference file contains the following unknown settings: [2023-11-19 04:57:17,114 WARN L103 SettingsManager]: * de.uni_freiburg.informatik.ultimate.core.Log level for class [2023-11-19 04:57:17,151 INFO L130 SettingsManager]: Preferences different from defaults after loading the file: [2023-11-19 04:57:17,152 INFO L151 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2023-11-19 04:57:17,153 INFO L153 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2023-11-19 04:57:17,154 INFO L151 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2023-11-19 04:57:17,159 INFO L153 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2023-11-19 04:57:17,159 INFO L153 SettingsManager]: * User list type=DISABLED [2023-11-19 04:57:17,160 INFO L151 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2023-11-19 04:57:17,160 INFO L153 SettingsManager]: * Explicit value domain=true [2023-11-19 04:57:17,162 INFO L153 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2023-11-19 04:57:17,162 INFO L153 SettingsManager]: * Octagon Domain=false [2023-11-19 04:57:17,163 INFO L153 SettingsManager]: * Abstract domain=CompoundDomain [2023-11-19 04:57:17,163 INFO L153 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2023-11-19 04:57:17,163 INFO L153 SettingsManager]: * Use the RCFG-of-the-future interface=true [2023-11-19 04:57:17,164 INFO L153 SettingsManager]: * Interval Domain=false [2023-11-19 04:57:17,164 INFO L151 SettingsManager]: Preferences of Sifa differ from their defaults: [2023-11-19 04:57:17,165 INFO L153 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2023-11-19 04:57:17,165 INFO L153 SettingsManager]: * Simplification Technique=POLY_PAC [2023-11-19 04:57:17,166 INFO L151 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2023-11-19 04:57:17,167 INFO L153 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2023-11-19 04:57:17,167 INFO L153 SettingsManager]: * sizeof long=4 [2023-11-19 04:57:17,168 INFO L153 SettingsManager]: * Overapproximate operations on floating types=true [2023-11-19 04:57:17,168 INFO L153 SettingsManager]: * sizeof POINTER=4 [2023-11-19 04:57:17,168 INFO L153 SettingsManager]: * Check division by zero=IGNORE [2023-11-19 04:57:17,169 INFO L153 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2023-11-19 04:57:17,169 INFO L153 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2023-11-19 04:57:17,171 INFO L153 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2023-11-19 04:57:17,171 INFO L153 SettingsManager]: * sizeof long double=12 [2023-11-19 04:57:17,171 INFO L153 SettingsManager]: * Check if freed pointer was valid=false [2023-11-19 04:57:17,171 INFO L153 SettingsManager]: * Use constant arrays=true [2023-11-19 04:57:17,172 INFO L151 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2023-11-19 04:57:17,172 INFO L153 SettingsManager]: * SMT solver=External_DefaultMode [2023-11-19 04:57:17,172 INFO L153 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2023-11-19 04:57:17,172 INFO L151 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2023-11-19 04:57:17,173 INFO L153 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2023-11-19 04:57:17,173 INFO L153 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopHeads [2023-11-19 04:57:17,173 INFO L153 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2023-11-19 04:57:17,173 INFO L153 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2023-11-19 04:57:17,174 INFO L153 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2023-11-19 04:57:17,174 INFO L153 SettingsManager]: * Trace refinement exception blacklist=NONE [2023-11-19 04:57:17,175 INFO L153 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2023-11-19 04:57:17,175 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_ed8734f7-7f84-4268-847c-71b14fc12f5e/bin/utaipan-verify-t7M7D8N6sZ/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ed8734f7-7f84-4268-847c-71b14fc12f5e/bin/utaipan-verify-t7M7D8N6sZ Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> deef9b1f63fa90bdeace0bbb769d25578ef53bda95c70ad5e444555427b2b0e2 [2023-11-19 04:57:17,488 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2023-11-19 04:57:17,510 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2023-11-19 04:57:17,512 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2023-11-19 04:57:17,513 INFO L270 PluginConnector]: Initializing CDTParser... [2023-11-19 04:57:17,514 INFO L274 PluginConnector]: CDTParser initialized [2023-11-19 04:57:17,515 INFO L431 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ed8734f7-7f84-4268-847c-71b14fc12f5e/bin/utaipan-verify-t7M7D8N6sZ/../../sv-benchmarks/c/nla-digbench-scaling/egcd2-ll_unwindbound50.c [2023-11-19 04:57:20,648 INFO L533 CDTParser]: Created temporary CDT project at NULL [2023-11-19 04:57:20,896 INFO L384 CDTParser]: Found 1 translation units. [2023-11-19 04:57:20,897 INFO L180 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ed8734f7-7f84-4268-847c-71b14fc12f5e/sv-benchmarks/c/nla-digbench-scaling/egcd2-ll_unwindbound50.c [2023-11-19 04:57:20,907 INFO L427 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ed8734f7-7f84-4268-847c-71b14fc12f5e/bin/utaipan-verify-t7M7D8N6sZ/data/dac21944d/4dced923eba94b5c80660ad66be8077d/FLAG2603b5990 [2023-11-19 04:57:20,925 INFO L435 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ed8734f7-7f84-4268-847c-71b14fc12f5e/bin/utaipan-verify-t7M7D8N6sZ/data/dac21944d/4dced923eba94b5c80660ad66be8077d [2023-11-19 04:57:20,929 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2023-11-19 04:57:20,931 INFO L133 ToolchainWalker]: Walking toolchain with 6 elements. [2023-11-19 04:57:20,933 INFO L112 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2023-11-19 04:57:20,934 INFO L270 PluginConnector]: Initializing CACSL2BoogieTranslator... [2023-11-19 04:57:20,939 INFO L274 PluginConnector]: CACSL2BoogieTranslator initialized [2023-11-19 04:57:20,940 INFO L184 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 19.11 04:57:20" (1/1) ... [2023-11-19 04:57:20,941 INFO L204 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@4be29855 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 04:57:20, skipping insertion in model container [2023-11-19 04:57:20,942 INFO L184 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 19.11 04:57:20" (1/1) ... [2023-11-19 04:57:20,964 INFO L177 MainTranslator]: Built tables and reachable declarations [2023-11-19 04:57:21,117 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_ed8734f7-7f84-4268-847c-71b14fc12f5e/sv-benchmarks/c/nla-digbench-scaling/egcd2-ll_unwindbound50.c[490,503] [2023-11-19 04:57:21,142 INFO L209 PostProcessor]: Analyzing one entry point: main [2023-11-19 04:57:21,153 INFO L202 MainTranslator]: Completed pre-run [2023-11-19 04:57:21,166 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_ed8734f7-7f84-4268-847c-71b14fc12f5e/sv-benchmarks/c/nla-digbench-scaling/egcd2-ll_unwindbound50.c[490,503] [2023-11-19 04:57:21,177 INFO L209 PostProcessor]: Analyzing one entry point: main [2023-11-19 04:57:21,192 INFO L206 MainTranslator]: Completed translation [2023-11-19 04:57:21,192 INFO L201 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 04:57:21 WrapperNode [2023-11-19 04:57:21,192 INFO L131 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2023-11-19 04:57:21,194 INFO L112 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2023-11-19 04:57:21,194 INFO L270 PluginConnector]: Initializing Boogie Procedure Inliner... [2023-11-19 04:57:21,194 INFO L274 PluginConnector]: Boogie Procedure Inliner initialized [2023-11-19 04:57:21,202 INFO L184 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 04:57:21" (1/1) ... [2023-11-19 04:57:21,210 INFO L184 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 04:57:21" (1/1) ... [2023-11-19 04:57:21,234 INFO L138 Inliner]: procedures = 14, calls = 17, calls flagged for inlining = 2, calls inlined = 2, statements flattened = 86 [2023-11-19 04:57:21,234 INFO L131 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2023-11-19 04:57:21,235 INFO L112 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2023-11-19 04:57:21,235 INFO L270 PluginConnector]: Initializing Boogie Preprocessor... [2023-11-19 04:57:21,235 INFO L274 PluginConnector]: Boogie Preprocessor initialized [2023-11-19 04:57:21,247 INFO L184 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 04:57:21" (1/1) ... [2023-11-19 04:57:21,248 INFO L184 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 04:57:21" (1/1) ... [2023-11-19 04:57:21,250 INFO L184 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 04:57:21" (1/1) ... [2023-11-19 04:57:21,250 INFO L184 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 04:57:21" (1/1) ... [2023-11-19 04:57:21,257 INFO L184 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 04:57:21" (1/1) ... [2023-11-19 04:57:21,262 INFO L184 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 04:57:21" (1/1) ... [2023-11-19 04:57:21,263 INFO L184 PluginConnector]: Executing the observer LTLStepAnnotator from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 04:57:21" (1/1) ... [2023-11-19 04:57:21,265 INFO L184 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 04:57:21" (1/1) ... [2023-11-19 04:57:21,274 INFO L131 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2023-11-19 04:57:21,284 INFO L112 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2023-11-19 04:57:21,285 INFO L270 PluginConnector]: Initializing RCFGBuilder... [2023-11-19 04:57:21,285 INFO L274 PluginConnector]: RCFGBuilder initialized [2023-11-19 04:57:21,286 INFO L184 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 04:57:21" (1/1) ... [2023-11-19 04:57:21,296 INFO L173 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2023-11-19 04:57:21,312 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ed8734f7-7f84-4268-847c-71b14fc12f5e/bin/utaipan-verify-t7M7D8N6sZ/z3 [2023-11-19 04:57:21,324 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ed8734f7-7f84-4268-847c-71b14fc12f5e/bin/utaipan-verify-t7M7D8N6sZ/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2023-11-19 04:57:21,326 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ed8734f7-7f84-4268-847c-71b14fc12f5e/bin/utaipan-verify-t7M7D8N6sZ/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2023-11-19 04:57:21,360 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2023-11-19 04:57:21,361 INFO L130 BoogieDeclarations]: Found specification of procedure assume_abort_if_not [2023-11-19 04:57:21,361 INFO L138 BoogieDeclarations]: Found implementation of procedure assume_abort_if_not [2023-11-19 04:57:21,361 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2023-11-19 04:57:21,362 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2023-11-19 04:57:21,362 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2023-11-19 04:57:21,363 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2023-11-19 04:57:21,363 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2023-11-19 04:57:21,427 INFO L236 CfgBuilder]: Building ICFG [2023-11-19 04:57:21,430 INFO L262 CfgBuilder]: Building CFG for each procedure with an implementation [2023-11-19 04:57:21,622 INFO L277 CfgBuilder]: Performing block encoding [2023-11-19 04:57:21,653 INFO L297 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2023-11-19 04:57:21,657 INFO L302 CfgBuilder]: Removed 2 assume(true) statements. [2023-11-19 04:57:21,663 INFO L201 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 19.11 04:57:21 BoogieIcfgContainer [2023-11-19 04:57:21,663 INFO L131 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2023-11-19 04:57:21,667 INFO L112 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2023-11-19 04:57:21,667 INFO L270 PluginConnector]: Initializing TraceAbstraction... [2023-11-19 04:57:21,671 INFO L274 PluginConnector]: TraceAbstraction initialized [2023-11-19 04:57:21,671 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 19.11 04:57:20" (1/3) ... [2023-11-19 04:57:21,672 INFO L204 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@3ae97ecb and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 19.11 04:57:21, skipping insertion in model container [2023-11-19 04:57:21,673 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 04:57:21" (2/3) ... [2023-11-19 04:57:21,675 INFO L204 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@3ae97ecb and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 19.11 04:57:21, skipping insertion in model container [2023-11-19 04:57:21,676 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 19.11 04:57:21" (3/3) ... [2023-11-19 04:57:21,677 INFO L112 eAbstractionObserver]: Analyzing ICFG egcd2-ll_unwindbound50.c [2023-11-19 04:57:21,699 INFO L203 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2023-11-19 04:57:21,700 INFO L162 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2023-11-19 04:57:21,767 INFO L356 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2023-11-19 04:57:21,778 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;@1a084e83, mLbeIndependenceSettings=[IndependenceType=SEMANTIC, AbstractionType=NONE, UseConditional=false, UseSemiCommutativity=true, Solver=Z3, SolverTimeout=1000ms] [2023-11-19 04:57:21,780 INFO L358 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2023-11-19 04:57:21,785 INFO L276 IsEmpty]: Start isEmpty. Operand has 29 states, 15 states have (on average 1.5333333333333334) internal successors, (23), 17 states have internal predecessors, (23), 10 states have call successors, (10), 2 states have call predecessors, (10), 2 states have return successors, (10), 10 states have call predecessors, (10), 10 states have call successors, (10) [2023-11-19 04:57:21,794 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2023-11-19 04:57:21,794 INFO L187 NwaCegarLoop]: Found error trace [2023-11-19 04:57:21,795 INFO L195 NwaCegarLoop]: trace histogram [4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-19 04:57:21,796 INFO L420 AbstractCegarLoop]: === Iteration 1 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-19 04:57:21,801 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-19 04:57:21,802 INFO L85 PathProgramCache]: Analyzing trace with hash 1288775727, now seen corresponding path program 1 times [2023-11-19 04:57:21,812 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-19 04:57:21,813 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1527731053] [2023-11-19 04:57:21,813 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-19 04:57:21,813 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-19 04:57:21,981 ERROR L246 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2023-11-19 04:57:21,981 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [853649592] [2023-11-19 04:57:21,981 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-19 04:57:21,982 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-19 04:57:21,983 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ed8734f7-7f84-4268-847c-71b14fc12f5e/bin/utaipan-verify-t7M7D8N6sZ/z3 [2023-11-19 04:57:21,988 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ed8734f7-7f84-4268-847c-71b14fc12f5e/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-19 04:57:22,008 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ed8734f7-7f84-4268-847c-71b14fc12f5e/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2023-11-19 04:57:22,093 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-19 04:57:22,095 INFO L262 TraceCheckSpWp]: Trace formula consists of 89 conjuncts, 1 conjunts are in the unsatisfiable core [2023-11-19 04:57:22,101 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-19 04:57:22,128 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2023-11-19 04:57:22,128 INFO L323 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2023-11-19 04:57:22,128 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-19 04:57:22,129 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1527731053] [2023-11-19 04:57:22,129 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2023-11-19 04:57:22,129 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [853649592] [2023-11-19 04:57:22,130 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [853649592] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-19 04:57:22,130 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-11-19 04:57:22,131 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2023-11-19 04:57:22,133 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1165169361] [2023-11-19 04:57:22,134 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-19 04:57:22,139 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 2 states [2023-11-19 04:57:22,140 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-19 04:57:22,189 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 2 interpolants. [2023-11-19 04:57:22,190 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2023-11-19 04:57:22,193 INFO L87 Difference]: Start difference. First operand has 29 states, 15 states have (on average 1.5333333333333334) internal successors, (23), 17 states have internal predecessors, (23), 10 states have call successors, (10), 2 states have call predecessors, (10), 2 states have return successors, (10), 10 states have call predecessors, (10), 10 states have call successors, (10) Second operand has 2 states, 2 states have (on average 3.5) internal successors, (7), 2 states have internal predecessors, (7), 2 states have call successors, (5), 2 states have call predecessors, (5), 1 states have return successors, (4), 1 states have call predecessors, (4), 1 states have call successors, (4) [2023-11-19 04:57:22,226 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-19 04:57:22,226 INFO L93 Difference]: Finished difference Result 50 states and 81 transitions. [2023-11-19 04:57:22,227 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2023-11-19 04:57:22,229 INFO L78 Accepts]: Start accepts. Automaton has has 2 states, 2 states have (on average 3.5) internal successors, (7), 2 states have internal predecessors, (7), 2 states have call successors, (5), 2 states have call predecessors, (5), 1 states have return successors, (4), 1 states have call predecessors, (4), 1 states have call successors, (4) Word has length 19 [2023-11-19 04:57:22,230 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-19 04:57:22,238 INFO L225 Difference]: With dead ends: 50 [2023-11-19 04:57:22,238 INFO L226 Difference]: Without dead ends: 27 [2023-11-19 04:57:22,241 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 18 GetRequests, 18 SyntacticMatches, 0 SemanticMatches, 0 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2023-11-19 04:57:22,245 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 [2023-11-19 04:57:22,247 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] [2023-11-19 04:57:22,266 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 27 states. [2023-11-19 04:57:22,286 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 27 to 27. [2023-11-19 04:57:22,288 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 27 states, 14 states have (on average 1.3571428571428572) internal successors, (19), 16 states have internal predecessors, (19), 10 states have call successors, (10), 2 states have call predecessors, (10), 2 states have return successors, (9), 9 states have call predecessors, (9), 9 states have call successors, (9) [2023-11-19 04:57:22,290 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 27 states to 27 states and 38 transitions. [2023-11-19 04:57:22,291 INFO L78 Accepts]: Start accepts. Automaton has 27 states and 38 transitions. Word has length 19 [2023-11-19 04:57:22,293 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-19 04:57:22,293 INFO L495 AbstractCegarLoop]: Abstraction has 27 states and 38 transitions. [2023-11-19 04:57:22,294 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 2 states, 2 states have (on average 3.5) internal successors, (7), 2 states have internal predecessors, (7), 2 states have call successors, (5), 2 states have call predecessors, (5), 1 states have return successors, (4), 1 states have call predecessors, (4), 1 states have call successors, (4) [2023-11-19 04:57:22,294 INFO L276 IsEmpty]: Start isEmpty. Operand 27 states and 38 transitions. [2023-11-19 04:57:22,296 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2023-11-19 04:57:22,296 INFO L187 NwaCegarLoop]: Found error trace [2023-11-19 04:57:22,296 INFO L195 NwaCegarLoop]: trace histogram [4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-19 04:57:22,322 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ed8734f7-7f84-4268-847c-71b14fc12f5e/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0 [2023-11-19 04:57:22,516 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ed8734f7-7f84-4268-847c-71b14fc12f5e/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable0 [2023-11-19 04:57:22,517 INFO L420 AbstractCegarLoop]: === Iteration 2 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-19 04:57:22,518 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-19 04:57:22,518 INFO L85 PathProgramCache]: Analyzing trace with hash 226858993, now seen corresponding path program 1 times [2023-11-19 04:57:22,518 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-19 04:57:22,518 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1823474543] [2023-11-19 04:57:22,518 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-19 04:57:22,519 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-19 04:57:22,541 ERROR L246 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2023-11-19 04:57:22,541 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [832830957] [2023-11-19 04:57:22,541 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-19 04:57:22,542 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-19 04:57:22,542 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ed8734f7-7f84-4268-847c-71b14fc12f5e/bin/utaipan-verify-t7M7D8N6sZ/z3 [2023-11-19 04:57:22,543 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ed8734f7-7f84-4268-847c-71b14fc12f5e/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-19 04:57:22,557 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ed8734f7-7f84-4268-847c-71b14fc12f5e/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2023-11-19 04:57:22,619 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-19 04:57:22,620 INFO L262 TraceCheckSpWp]: Trace formula consists of 93 conjuncts, 3 conjunts are in the unsatisfiable core [2023-11-19 04:57:22,623 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-19 04:57:22,703 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2023-11-19 04:57:22,703 INFO L323 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2023-11-19 04:57:22,704 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-19 04:57:22,704 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1823474543] [2023-11-19 04:57:22,704 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2023-11-19 04:57:22,704 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [832830957] [2023-11-19 04:57:22,705 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [832830957] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-19 04:57:22,705 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-11-19 04:57:22,705 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2023-11-19 04:57:22,706 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1558227478] [2023-11-19 04:57:22,706 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-19 04:57:22,707 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2023-11-19 04:57:22,707 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-19 04:57:22,708 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2023-11-19 04:57:22,709 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2023-11-19 04:57:22,709 INFO L87 Difference]: Start difference. First operand 27 states and 38 transitions. Second operand has 4 states, 4 states have (on average 2.0) internal successors, (8), 3 states have internal predecessors, (8), 2 states have call successors, (5), 2 states have call predecessors, (5), 1 states have return successors, (4), 1 states have call predecessors, (4), 1 states have call successors, (4) [2023-11-19 04:57:22,737 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-19 04:57:22,737 INFO L93 Difference]: Finished difference Result 37 states and 49 transitions. [2023-11-19 04:57:22,738 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2023-11-19 04:57:22,738 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 2.0) internal successors, (8), 3 states have internal predecessors, (8), 2 states have call successors, (5), 2 states have call predecessors, (5), 1 states have return successors, (4), 1 states have call predecessors, (4), 1 states have call successors, (4) Word has length 20 [2023-11-19 04:57:22,739 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-19 04:57:22,740 INFO L225 Difference]: With dead ends: 37 [2023-11-19 04:57:22,740 INFO L226 Difference]: Without dead ends: 29 [2023-11-19 04:57:22,741 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 19 GetRequests, 17 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2023-11-19 04:57:22,742 INFO L413 NwaCegarLoop]: 34 mSDtfsCounter, 0 mSDsluCounter, 57 mSDsCounter, 0 mSdLazyCounter, 12 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 91 SdHoareTripleChecker+Invalid, 12 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 12 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2023-11-19 04:57:22,743 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [0 Valid, 91 Invalid, 12 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 12 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2023-11-19 04:57:22,744 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 29 states. [2023-11-19 04:57:22,751 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 29 to 29. [2023-11-19 04:57:22,751 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 29 states, 16 states have (on average 1.3125) internal successors, (21), 17 states have internal predecessors, (21), 10 states have call successors, (10), 2 states have call predecessors, (10), 2 states have return successors, (9), 9 states have call predecessors, (9), 9 states have call successors, (9) [2023-11-19 04:57:22,753 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 29 states to 29 states and 40 transitions. [2023-11-19 04:57:22,754 INFO L78 Accepts]: Start accepts. Automaton has 29 states and 40 transitions. Word has length 20 [2023-11-19 04:57:22,754 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-19 04:57:22,754 INFO L495 AbstractCegarLoop]: Abstraction has 29 states and 40 transitions. [2023-11-19 04:57:22,755 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 2.0) internal successors, (8), 3 states have internal predecessors, (8), 2 states have call successors, (5), 2 states have call predecessors, (5), 1 states have return successors, (4), 1 states have call predecessors, (4), 1 states have call successors, (4) [2023-11-19 04:57:22,755 INFO L276 IsEmpty]: Start isEmpty. Operand 29 states and 40 transitions. [2023-11-19 04:57:22,756 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2023-11-19 04:57:22,756 INFO L187 NwaCegarLoop]: Found error trace [2023-11-19 04:57:22,756 INFO L195 NwaCegarLoop]: trace histogram [4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-19 04:57:22,782 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ed8734f7-7f84-4268-847c-71b14fc12f5e/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Forceful destruction successful, exit code 0 [2023-11-19 04:57:22,976 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1,3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ed8734f7-7f84-4268-847c-71b14fc12f5e/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-19 04:57:22,977 INFO L420 AbstractCegarLoop]: === Iteration 3 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-19 04:57:22,978 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-19 04:57:22,978 INFO L85 PathProgramCache]: Analyzing trace with hash -1563892497, now seen corresponding path program 1 times [2023-11-19 04:57:22,978 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-19 04:57:22,978 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1610103429] [2023-11-19 04:57:22,978 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-19 04:57:22,979 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-19 04:57:22,996 ERROR L246 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2023-11-19 04:57:22,996 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [2025866771] [2023-11-19 04:57:22,996 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-19 04:57:22,997 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-19 04:57:22,997 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ed8734f7-7f84-4268-847c-71b14fc12f5e/bin/utaipan-verify-t7M7D8N6sZ/z3 [2023-11-19 04:57:22,998 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ed8734f7-7f84-4268-847c-71b14fc12f5e/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-19 04:57:23,016 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ed8734f7-7f84-4268-847c-71b14fc12f5e/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2023-11-19 04:57:23,086 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-19 04:57:23,087 INFO L262 TraceCheckSpWp]: Trace formula consists of 95 conjuncts, 11 conjunts are in the unsatisfiable core [2023-11-19 04:57:23,090 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-19 04:57:23,243 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2023-11-19 04:57:23,243 INFO L323 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2023-11-19 04:57:23,244 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-19 04:57:23,244 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1610103429] [2023-11-19 04:57:23,244 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2023-11-19 04:57:23,245 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2025866771] [2023-11-19 04:57:23,245 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2025866771] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-19 04:57:23,245 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-11-19 04:57:23,245 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2023-11-19 04:57:23,246 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1434195767] [2023-11-19 04:57:23,246 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-19 04:57:23,247 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2023-11-19 04:57:23,247 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-19 04:57:23,248 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2023-11-19 04:57:23,248 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2023-11-19 04:57:23,248 INFO L87 Difference]: Start difference. First operand 29 states and 40 transitions. Second operand has 6 states, 5 states have (on average 1.8) internal successors, (9), 5 states have internal predecessors, (9), 3 states have call successors, (5), 2 states have call predecessors, (5), 1 states have return successors, (4), 2 states have call predecessors, (4), 2 states have call successors, (4) [2023-11-19 04:57:23,412 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-19 04:57:23,412 INFO L93 Difference]: Finished difference Result 46 states and 64 transitions. [2023-11-19 04:57:23,412 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2023-11-19 04:57:23,413 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 5 states have (on average 1.8) internal successors, (9), 5 states have internal predecessors, (9), 3 states have call successors, (5), 2 states have call predecessors, (5), 1 states have return successors, (4), 2 states have call predecessors, (4), 2 states have call successors, (4) Word has length 21 [2023-11-19 04:57:23,413 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-19 04:57:23,414 INFO L225 Difference]: With dead ends: 46 [2023-11-19 04:57:23,414 INFO L226 Difference]: Without dead ends: 44 [2023-11-19 04:57:23,415 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 22 GetRequests, 16 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=17, Invalid=39, Unknown=0, NotChecked=0, Total=56 [2023-11-19 04:57:23,416 INFO L413 NwaCegarLoop]: 27 mSDtfsCounter, 12 mSDsluCounter, 97 mSDsCounter, 0 mSdLazyCounter, 63 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 16 SdHoareTripleChecker+Valid, 124 SdHoareTripleChecker+Invalid, 66 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 63 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-11-19 04:57:23,416 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [16 Valid, 124 Invalid, 66 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 63 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-11-19 04:57:23,417 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 44 states. [2023-11-19 04:57:23,431 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 44 to 42. [2023-11-19 04:57:23,432 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 42 states, 23 states have (on average 1.3478260869565217) internal successors, (31), 25 states have internal predecessors, (31), 15 states have call successors, (15), 3 states have call predecessors, (15), 3 states have return successors, (14), 13 states have call predecessors, (14), 14 states have call successors, (14) [2023-11-19 04:57:23,434 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 42 states to 42 states and 60 transitions. [2023-11-19 04:57:23,434 INFO L78 Accepts]: Start accepts. Automaton has 42 states and 60 transitions. Word has length 21 [2023-11-19 04:57:23,435 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-19 04:57:23,435 INFO L495 AbstractCegarLoop]: Abstraction has 42 states and 60 transitions. [2023-11-19 04:57:23,435 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 5 states have (on average 1.8) internal successors, (9), 5 states have internal predecessors, (9), 3 states have call successors, (5), 2 states have call predecessors, (5), 1 states have return successors, (4), 2 states have call predecessors, (4), 2 states have call successors, (4) [2023-11-19 04:57:23,436 INFO L276 IsEmpty]: Start isEmpty. Operand 42 states and 60 transitions. [2023-11-19 04:57:23,437 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 24 [2023-11-19 04:57:23,437 INFO L187 NwaCegarLoop]: Found error trace [2023-11-19 04:57:23,437 INFO L195 NwaCegarLoop]: trace histogram [4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-19 04:57:23,463 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ed8734f7-7f84-4268-847c-71b14fc12f5e/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Forceful destruction successful, exit code 0 [2023-11-19 04:57:23,658 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2,4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ed8734f7-7f84-4268-847c-71b14fc12f5e/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-19 04:57:23,659 INFO L420 AbstractCegarLoop]: === Iteration 4 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-19 04:57:23,659 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-19 04:57:23,659 INFO L85 PathProgramCache]: Analyzing trace with hash 281079646, now seen corresponding path program 1 times [2023-11-19 04:57:23,660 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-19 04:57:23,660 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [722579130] [2023-11-19 04:57:23,660 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-19 04:57:23,660 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-19 04:57:23,679 ERROR L246 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2023-11-19 04:57:23,680 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [55985313] [2023-11-19 04:57:23,680 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-19 04:57:23,680 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-19 04:57:23,680 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ed8734f7-7f84-4268-847c-71b14fc12f5e/bin/utaipan-verify-t7M7D8N6sZ/z3 [2023-11-19 04:57:23,687 INFO L229 MonitoredProcess]: Starting monitored process 5 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ed8734f7-7f84-4268-847c-71b14fc12f5e/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-19 04:57:23,709 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ed8734f7-7f84-4268-847c-71b14fc12f5e/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2023-11-19 04:57:23,749 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-19 04:57:23,750 INFO L262 TraceCheckSpWp]: Trace formula consists of 103 conjuncts, 7 conjunts are in the unsatisfiable core [2023-11-19 04:57:23,753 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-19 04:57:23,799 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2023-11-19 04:57:23,800 INFO L323 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2023-11-19 04:57:23,800 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-19 04:57:23,800 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [722579130] [2023-11-19 04:57:23,800 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2023-11-19 04:57:23,801 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [55985313] [2023-11-19 04:57:23,801 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [55985313] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-19 04:57:23,801 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-11-19 04:57:23,801 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2023-11-19 04:57:23,801 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [436384957] [2023-11-19 04:57:23,802 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-19 04:57:23,802 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2023-11-19 04:57:23,802 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-19 04:57:23,803 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2023-11-19 04:57:23,803 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2023-11-19 04:57:23,804 INFO L87 Difference]: Start difference. First operand 42 states and 60 transitions. Second operand has 5 states, 5 states have (on average 2.2) internal successors, (11), 4 states have internal predecessors, (11), 2 states have call successors, (5), 2 states have call predecessors, (5), 1 states have return successors, (4), 1 states have call predecessors, (4), 1 states have call successors, (4) [2023-11-19 04:57:23,867 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-19 04:57:23,867 INFO L93 Difference]: Finished difference Result 63 states and 92 transitions. [2023-11-19 04:57:23,867 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2023-11-19 04:57:23,868 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 2.2) internal successors, (11), 4 states have internal predecessors, (11), 2 states have call successors, (5), 2 states have call predecessors, (5), 1 states have return successors, (4), 1 states have call predecessors, (4), 1 states have call successors, (4) Word has length 23 [2023-11-19 04:57:23,868 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-19 04:57:23,871 INFO L225 Difference]: With dead ends: 63 [2023-11-19 04:57:23,871 INFO L226 Difference]: Without dead ends: 61 [2023-11-19 04:57:23,872 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 23 GetRequests, 19 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2023-11-19 04:57:23,873 INFO L413 NwaCegarLoop]: 33 mSDtfsCounter, 7 mSDsluCounter, 86 mSDsCounter, 0 mSdLazyCounter, 38 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 11 SdHoareTripleChecker+Valid, 119 SdHoareTripleChecker+Invalid, 38 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 38 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2023-11-19 04:57:23,874 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [11 Valid, 119 Invalid, 38 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 38 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2023-11-19 04:57:23,875 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 61 states. [2023-11-19 04:57:23,889 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 61 to 52. [2023-11-19 04:57:23,889 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 52 states, 30 states have (on average 1.3333333333333333) internal successors, (40), 34 states have internal predecessors, (40), 17 states have call successors, (17), 4 states have call predecessors, (17), 4 states have return successors, (16), 13 states have call predecessors, (16), 16 states have call successors, (16) [2023-11-19 04:57:23,891 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 52 states to 52 states and 73 transitions. [2023-11-19 04:57:23,891 INFO L78 Accepts]: Start accepts. Automaton has 52 states and 73 transitions. Word has length 23 [2023-11-19 04:57:23,891 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-19 04:57:23,892 INFO L495 AbstractCegarLoop]: Abstraction has 52 states and 73 transitions. [2023-11-19 04:57:23,892 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 2.2) internal successors, (11), 4 states have internal predecessors, (11), 2 states have call successors, (5), 2 states have call predecessors, (5), 1 states have return successors, (4), 1 states have call predecessors, (4), 1 states have call successors, (4) [2023-11-19 04:57:23,892 INFO L276 IsEmpty]: Start isEmpty. Operand 52 states and 73 transitions. [2023-11-19 04:57:23,893 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2023-11-19 04:57:23,893 INFO L187 NwaCegarLoop]: Found error trace [2023-11-19 04:57:23,893 INFO L195 NwaCegarLoop]: trace histogram [4, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-19 04:57:23,920 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ed8734f7-7f84-4268-847c-71b14fc12f5e/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Forceful destruction successful, exit code 0 [2023-11-19 04:57:24,110 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3,5 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ed8734f7-7f84-4268-847c-71b14fc12f5e/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-19 04:57:24,111 INFO L420 AbstractCegarLoop]: === Iteration 5 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-19 04:57:24,111 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-19 04:57:24,112 INFO L85 PathProgramCache]: Analyzing trace with hash -1724883567, now seen corresponding path program 1 times [2023-11-19 04:57:24,112 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-19 04:57:24,112 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [308563622] [2023-11-19 04:57:24,112 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-19 04:57:24,112 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-19 04:57:24,135 ERROR L246 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2023-11-19 04:57:24,136 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1792590184] [2023-11-19 04:57:24,136 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-19 04:57:24,136 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-19 04:57:24,136 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ed8734f7-7f84-4268-847c-71b14fc12f5e/bin/utaipan-verify-t7M7D8N6sZ/z3 [2023-11-19 04:57:24,137 INFO L229 MonitoredProcess]: Starting monitored process 6 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ed8734f7-7f84-4268-847c-71b14fc12f5e/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-19 04:57:24,145 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ed8734f7-7f84-4268-847c-71b14fc12f5e/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2023-11-19 04:57:24,206 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-19 04:57:24,208 INFO L262 TraceCheckSpWp]: Trace formula consists of 104 conjuncts, 9 conjunts are in the unsatisfiable core [2023-11-19 04:57:24,211 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-19 04:57:24,384 INFO L134 CoverageAnalysis]: Checked inductivity of 14 backedges. 2 proven. 0 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2023-11-19 04:57:24,384 INFO L323 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2023-11-19 04:57:24,384 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-19 04:57:24,385 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [308563622] [2023-11-19 04:57:24,385 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2023-11-19 04:57:24,385 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1792590184] [2023-11-19 04:57:24,385 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1792590184] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-19 04:57:24,385 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-11-19 04:57:24,385 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2023-11-19 04:57:24,385 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1010115319] [2023-11-19 04:57:24,386 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-19 04:57:24,386 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2023-11-19 04:57:24,386 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-19 04:57:24,387 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2023-11-19 04:57:24,387 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2023-11-19 04:57:24,387 INFO L87 Difference]: Start difference. First operand 52 states and 73 transitions. Second operand has 5 states, 5 states have (on average 2.4) internal successors, (12), 4 states have internal predecessors, (12), 2 states have call successors, (6), 2 states have call predecessors, (6), 1 states have return successors, (5), 2 states have call predecessors, (5), 2 states have call successors, (5) [2023-11-19 04:57:24,473 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-19 04:57:24,473 INFO L93 Difference]: Finished difference Result 60 states and 80 transitions. [2023-11-19 04:57:24,473 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2023-11-19 04:57:24,474 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 2.4) internal successors, (12), 4 states have internal predecessors, (12), 2 states have call successors, (6), 2 states have call predecessors, (6), 1 states have return successors, (5), 2 states have call predecessors, (5), 2 states have call successors, (5) Word has length 26 [2023-11-19 04:57:24,475 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-19 04:57:24,477 INFO L225 Difference]: With dead ends: 60 [2023-11-19 04:57:24,478 INFO L226 Difference]: Without dead ends: 56 [2023-11-19 04:57:24,478 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 26 GetRequests, 22 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2023-11-19 04:57:24,481 INFO L413 NwaCegarLoop]: 34 mSDtfsCounter, 11 mSDsluCounter, 88 mSDsCounter, 0 mSdLazyCounter, 33 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 15 SdHoareTripleChecker+Valid, 122 SdHoareTripleChecker+Invalid, 34 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 33 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-11-19 04:57:24,482 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [15 Valid, 122 Invalid, 34 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 33 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-11-19 04:57:24,485 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 56 states. [2023-11-19 04:57:24,511 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 56 to 55. [2023-11-19 04:57:24,512 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 55 states, 33 states have (on average 1.2727272727272727) internal successors, (42), 36 states have internal predecessors, (42), 16 states have call successors, (16), 5 states have call predecessors, (16), 5 states have return successors, (15), 13 states have call predecessors, (15), 15 states have call successors, (15) [2023-11-19 04:57:24,513 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 55 states to 55 states and 73 transitions. [2023-11-19 04:57:24,513 INFO L78 Accepts]: Start accepts. Automaton has 55 states and 73 transitions. Word has length 26 [2023-11-19 04:57:24,513 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-19 04:57:24,514 INFO L495 AbstractCegarLoop]: Abstraction has 55 states and 73 transitions. [2023-11-19 04:57:24,514 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 2.4) internal successors, (12), 4 states have internal predecessors, (12), 2 states have call successors, (6), 2 states have call predecessors, (6), 1 states have return successors, (5), 2 states have call predecessors, (5), 2 states have call successors, (5) [2023-11-19 04:57:24,514 INFO L276 IsEmpty]: Start isEmpty. Operand 55 states and 73 transitions. [2023-11-19 04:57:24,515 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2023-11-19 04:57:24,515 INFO L187 NwaCegarLoop]: Found error trace [2023-11-19 04:57:24,515 INFO L195 NwaCegarLoop]: trace histogram [4, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-19 04:57:24,536 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ed8734f7-7f84-4268-847c-71b14fc12f5e/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Forceful destruction successful, exit code 0 [2023-11-19 04:57:24,728 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,6 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ed8734f7-7f84-4268-847c-71b14fc12f5e/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-19 04:57:24,729 INFO L420 AbstractCegarLoop]: === Iteration 6 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-19 04:57:24,730 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-19 04:57:24,730 INFO L85 PathProgramCache]: Analyzing trace with hash -717512630, now seen corresponding path program 1 times [2023-11-19 04:57:24,730 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-19 04:57:24,730 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1222823671] [2023-11-19 04:57:24,731 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-19 04:57:24,731 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-19 04:57:24,752 ERROR L246 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2023-11-19 04:57:24,752 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1222239794] [2023-11-19 04:57:24,753 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-19 04:57:24,753 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-19 04:57:24,753 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ed8734f7-7f84-4268-847c-71b14fc12f5e/bin/utaipan-verify-t7M7D8N6sZ/z3 [2023-11-19 04:57:24,754 INFO L229 MonitoredProcess]: Starting monitored process 7 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ed8734f7-7f84-4268-847c-71b14fc12f5e/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-19 04:57:24,772 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ed8734f7-7f84-4268-847c-71b14fc12f5e/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Waiting until timeout for monitored process [2023-11-19 04:57:24,815 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-19 04:57:24,817 INFO L262 TraceCheckSpWp]: Trace formula consists of 120 conjuncts, 5 conjunts are in the unsatisfiable core [2023-11-19 04:57:24,819 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-19 04:57:24,868 INFO L134 CoverageAnalysis]: Checked inductivity of 14 backedges. 2 proven. 0 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2023-11-19 04:57:24,869 INFO L323 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2023-11-19 04:57:24,869 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-19 04:57:24,872 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1222823671] [2023-11-19 04:57:24,872 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2023-11-19 04:57:24,872 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1222239794] [2023-11-19 04:57:24,872 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1222239794] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-19 04:57:24,872 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-11-19 04:57:24,872 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2023-11-19 04:57:24,873 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [255377953] [2023-11-19 04:57:24,873 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-19 04:57:24,873 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2023-11-19 04:57:24,874 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-19 04:57:24,874 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2023-11-19 04:57:24,874 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2023-11-19 04:57:24,875 INFO L87 Difference]: Start difference. First operand 55 states and 73 transitions. Second operand has 5 states, 5 states have (on average 2.8) internal successors, (14), 4 states have internal predecessors, (14), 2 states have call successors, (5), 2 states have call predecessors, (5), 1 states have return successors, (4), 1 states have call predecessors, (4), 1 states have call successors, (4) [2023-11-19 04:57:24,912 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-19 04:57:24,912 INFO L93 Difference]: Finished difference Result 81 states and 108 transitions. [2023-11-19 04:57:24,912 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2023-11-19 04:57:24,912 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 2.8) internal successors, (14), 4 states have internal predecessors, (14), 2 states have call successors, (5), 2 states have call predecessors, (5), 1 states have return successors, (4), 1 states have call predecessors, (4), 1 states have call successors, (4) Word has length 26 [2023-11-19 04:57:24,913 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-19 04:57:24,915 INFO L225 Difference]: With dead ends: 81 [2023-11-19 04:57:24,915 INFO L226 Difference]: Without dead ends: 55 [2023-11-19 04:57:24,916 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 25 GetRequests, 22 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2023-11-19 04:57:24,918 INFO L413 NwaCegarLoop]: 33 mSDtfsCounter, 0 mSDsluCounter, 58 mSDsCounter, 0 mSdLazyCounter, 15 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 91 SdHoareTripleChecker+Invalid, 15 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 15 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2023-11-19 04:57:24,918 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [0 Valid, 91 Invalid, 15 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 15 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2023-11-19 04:57:24,920 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 55 states. [2023-11-19 04:57:24,931 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 55 to 55. [2023-11-19 04:57:24,931 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 55 states, 33 states have (on average 1.2424242424242424) internal successors, (41), 36 states have internal predecessors, (41), 16 states have call successors, (16), 5 states have call predecessors, (16), 5 states have return successors, (15), 13 states have call predecessors, (15), 15 states have call successors, (15) [2023-11-19 04:57:24,934 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 55 states to 55 states and 72 transitions. [2023-11-19 04:57:24,934 INFO L78 Accepts]: Start accepts. Automaton has 55 states and 72 transitions. Word has length 26 [2023-11-19 04:57:24,935 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-19 04:57:24,935 INFO L495 AbstractCegarLoop]: Abstraction has 55 states and 72 transitions. [2023-11-19 04:57:24,935 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 2.8) internal successors, (14), 4 states have internal predecessors, (14), 2 states have call successors, (5), 2 states have call predecessors, (5), 1 states have return successors, (4), 1 states have call predecessors, (4), 1 states have call successors, (4) [2023-11-19 04:57:24,935 INFO L276 IsEmpty]: Start isEmpty. Operand 55 states and 72 transitions. [2023-11-19 04:57:24,936 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 39 [2023-11-19 04:57:24,936 INFO L187 NwaCegarLoop]: Found error trace [2023-11-19 04:57:24,936 INFO L195 NwaCegarLoop]: trace histogram [4, 4, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-19 04:57:24,960 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ed8734f7-7f84-4268-847c-71b14fc12f5e/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Forceful destruction successful, exit code 0 [2023-11-19 04:57:25,137 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5,7 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ed8734f7-7f84-4268-847c-71b14fc12f5e/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-19 04:57:25,137 INFO L420 AbstractCegarLoop]: === Iteration 7 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-19 04:57:25,138 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-19 04:57:25,138 INFO L85 PathProgramCache]: Analyzing trace with hash -2048234814, now seen corresponding path program 1 times [2023-11-19 04:57:25,138 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-19 04:57:25,138 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [268794273] [2023-11-19 04:57:25,138 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-19 04:57:25,138 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-19 04:57:25,158 ERROR L246 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2023-11-19 04:57:25,160 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1631631084] [2023-11-19 04:57:25,161 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-19 04:57:25,161 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-19 04:57:25,161 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ed8734f7-7f84-4268-847c-71b14fc12f5e/bin/utaipan-verify-t7M7D8N6sZ/z3 [2023-11-19 04:57:25,162 INFO L229 MonitoredProcess]: Starting monitored process 8 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ed8734f7-7f84-4268-847c-71b14fc12f5e/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-19 04:57:25,184 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ed8734f7-7f84-4268-847c-71b14fc12f5e/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Waiting until timeout for monitored process [2023-11-19 04:57:25,235 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-19 04:57:25,237 INFO L262 TraceCheckSpWp]: Trace formula consists of 130 conjuncts, 11 conjunts are in the unsatisfiable core [2023-11-19 04:57:25,244 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-19 04:57:25,466 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 6 proven. 0 refuted. 0 times theorem prover too weak. 24 trivial. 0 not checked. [2023-11-19 04:57:25,466 INFO L323 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2023-11-19 04:57:25,466 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-19 04:57:25,466 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [268794273] [2023-11-19 04:57:25,467 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2023-11-19 04:57:25,467 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1631631084] [2023-11-19 04:57:25,467 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1631631084] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-19 04:57:25,467 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-11-19 04:57:25,467 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2023-11-19 04:57:25,467 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [152519236] [2023-11-19 04:57:25,468 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-19 04:57:25,469 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2023-11-19 04:57:25,469 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-19 04:57:25,470 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2023-11-19 04:57:25,471 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2023-11-19 04:57:25,471 INFO L87 Difference]: Start difference. First operand 55 states and 72 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, (8), 2 states have call predecessors, (8), 1 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) [2023-11-19 04:57:25,545 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-19 04:57:25,545 INFO L93 Difference]: Finished difference Result 62 states and 78 transitions. [2023-11-19 04:57:25,545 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2023-11-19 04:57:25,546 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, (8), 2 states have call predecessors, (8), 1 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) Word has length 38 [2023-11-19 04:57:25,553 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-19 04:57:25,554 INFO L225 Difference]: With dead ends: 62 [2023-11-19 04:57:25,554 INFO L226 Difference]: Without dead ends: 60 [2023-11-19 04:57:25,555 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 38 GetRequests, 34 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2023-11-19 04:57:25,556 INFO L413 NwaCegarLoop]: 31 mSDtfsCounter, 8 mSDsluCounter, 79 mSDsCounter, 0 mSdLazyCounter, 45 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 9 SdHoareTripleChecker+Valid, 110 SdHoareTripleChecker+Invalid, 46 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 45 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2023-11-19 04:57:25,556 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [9 Valid, 110 Invalid, 46 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 45 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2023-11-19 04:57:25,557 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 60 states. [2023-11-19 04:57:25,573 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 60 to 59. [2023-11-19 04:57:25,573 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 59 states, 36 states have (on average 1.2222222222222223) internal successors, (44), 39 states have internal predecessors, (44), 16 states have call successors, (16), 6 states have call predecessors, (16), 6 states have return successors, (15), 13 states have call predecessors, (15), 15 states have call successors, (15) [2023-11-19 04:57:25,577 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 59 states to 59 states and 75 transitions. [2023-11-19 04:57:25,577 INFO L78 Accepts]: Start accepts. Automaton has 59 states and 75 transitions. Word has length 38 [2023-11-19 04:57:25,578 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-19 04:57:25,578 INFO L495 AbstractCegarLoop]: Abstraction has 59 states and 75 transitions. [2023-11-19 04:57:25,578 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, (8), 2 states have call predecessors, (8), 1 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) [2023-11-19 04:57:25,578 INFO L276 IsEmpty]: Start isEmpty. Operand 59 states and 75 transitions. [2023-11-19 04:57:25,585 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 47 [2023-11-19 04:57:25,585 INFO L187 NwaCegarLoop]: Found error trace [2023-11-19 04:57:25,586 INFO L195 NwaCegarLoop]: trace histogram [5, 4, 4, 4, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-19 04:57:25,605 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ed8734f7-7f84-4268-847c-71b14fc12f5e/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Forceful destruction successful, exit code 0 [2023-11-19 04:57:25,805 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6,8 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ed8734f7-7f84-4268-847c-71b14fc12f5e/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-19 04:57:25,805 INFO L420 AbstractCegarLoop]: === Iteration 8 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-19 04:57:25,806 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-19 04:57:25,806 INFO L85 PathProgramCache]: Analyzing trace with hash 514196582, now seen corresponding path program 1 times [2023-11-19 04:57:25,806 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-19 04:57:25,806 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [469376159] [2023-11-19 04:57:25,806 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-19 04:57:25,806 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-19 04:57:25,822 ERROR L246 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2023-11-19 04:57:25,823 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [311338347] [2023-11-19 04:57:25,824 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-19 04:57:25,824 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-19 04:57:25,824 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ed8734f7-7f84-4268-847c-71b14fc12f5e/bin/utaipan-verify-t7M7D8N6sZ/z3 [2023-11-19 04:57:25,825 INFO L229 MonitoredProcess]: Starting monitored process 9 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ed8734f7-7f84-4268-847c-71b14fc12f5e/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-19 04:57:25,833 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ed8734f7-7f84-4268-847c-71b14fc12f5e/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Waiting until timeout for monitored process [2023-11-19 04:57:25,897 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-19 04:57:25,899 INFO L262 TraceCheckSpWp]: Trace formula consists of 149 conjuncts, 15 conjunts are in the unsatisfiable core [2023-11-19 04:57:25,914 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-19 04:57:26,015 INFO L134 CoverageAnalysis]: Checked inductivity of 47 backedges. 8 proven. 3 refuted. 0 times theorem prover too weak. 36 trivial. 0 not checked. [2023-11-19 04:57:26,015 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-19 04:57:26,131 INFO L134 CoverageAnalysis]: Checked inductivity of 47 backedges. 8 proven. 0 refuted. 0 times theorem prover too weak. 39 trivial. 0 not checked. [2023-11-19 04:57:26,135 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-19 04:57:26,136 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [469376159] [2023-11-19 04:57:26,136 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2023-11-19 04:57:26,136 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [311338347] [2023-11-19 04:57:26,136 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [311338347] provided 1 perfect and 1 imperfect interpolant sequences [2023-11-19 04:57:26,136 INFO L185 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2023-11-19 04:57:26,136 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [6] total 7 [2023-11-19 04:57:26,137 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2058734361] [2023-11-19 04:57:26,137 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-19 04:57:26,137 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2023-11-19 04:57:26,137 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-19 04:57:26,138 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2023-11-19 04:57:26,138 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=13, Invalid=29, Unknown=0, NotChecked=0, Total=42 [2023-11-19 04:57:26,138 INFO L87 Difference]: Start difference. First operand 59 states and 75 transitions. Second operand has 5 states, 5 states have (on average 3.0) internal successors, (15), 4 states have internal predecessors, (15), 2 states have call successors, (9), 2 states have call predecessors, (9), 1 states have return successors, (8), 2 states have call predecessors, (8), 2 states have call successors, (8) [2023-11-19 04:57:26,205 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-19 04:57:26,205 INFO L93 Difference]: Finished difference Result 65 states and 80 transitions. [2023-11-19 04:57:26,206 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2023-11-19 04:57:26,206 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 3.0) internal successors, (15), 4 states have internal predecessors, (15), 2 states have call successors, (9), 2 states have call predecessors, (9), 1 states have return successors, (8), 2 states have call predecessors, (8), 2 states have call successors, (8) Word has length 46 [2023-11-19 04:57:26,207 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-19 04:57:26,208 INFO L225 Difference]: With dead ends: 65 [2023-11-19 04:57:26,208 INFO L226 Difference]: Without dead ends: 63 [2023-11-19 04:57:26,208 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 91 GetRequests, 83 SyntacticMatches, 2 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=17, Invalid=39, Unknown=0, NotChecked=0, Total=56 [2023-11-19 04:57:26,210 INFO L413 NwaCegarLoop]: 30 mSDtfsCounter, 7 mSDsluCounter, 75 mSDsCounter, 0 mSdLazyCounter, 36 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 7 SdHoareTripleChecker+Valid, 105 SdHoareTripleChecker+Invalid, 36 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 36 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2023-11-19 04:57:26,210 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [7 Valid, 105 Invalid, 36 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 36 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2023-11-19 04:57:26,211 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 63 states. [2023-11-19 04:57:26,231 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 63 to 55. [2023-11-19 04:57:26,233 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 55 states, 34 states have (on average 1.2058823529411764) internal successors, (41), 35 states have internal predecessors, (41), 14 states have call successors, (14), 6 states have call predecessors, (14), 6 states have return successors, (13), 13 states have call predecessors, (13), 13 states have call successors, (13) [2023-11-19 04:57:26,234 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 55 states to 55 states and 68 transitions. [2023-11-19 04:57:26,234 INFO L78 Accepts]: Start accepts. Automaton has 55 states and 68 transitions. Word has length 46 [2023-11-19 04:57:26,235 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-19 04:57:26,236 INFO L495 AbstractCegarLoop]: Abstraction has 55 states and 68 transitions. [2023-11-19 04:57:26,236 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 3.0) internal successors, (15), 4 states have internal predecessors, (15), 2 states have call successors, (9), 2 states have call predecessors, (9), 1 states have return successors, (8), 2 states have call predecessors, (8), 2 states have call successors, (8) [2023-11-19 04:57:26,236 INFO L276 IsEmpty]: Start isEmpty. Operand 55 states and 68 transitions. [2023-11-19 04:57:26,237 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 48 [2023-11-19 04:57:26,237 INFO L187 NwaCegarLoop]: Found error trace [2023-11-19 04:57:26,238 INFO L195 NwaCegarLoop]: trace histogram [5, 4, 4, 4, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-19 04:57:26,258 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ed8734f7-7f84-4268-847c-71b14fc12f5e/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Forceful destruction successful, exit code 0 [2023-11-19 04:57:26,452 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7,9 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ed8734f7-7f84-4268-847c-71b14fc12f5e/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-19 04:57:26,452 INFO L420 AbstractCegarLoop]: === Iteration 9 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-19 04:57:26,453 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-19 04:57:26,453 INFO L85 PathProgramCache]: Analyzing trace with hash 2026078407, now seen corresponding path program 1 times [2023-11-19 04:57:26,453 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-19 04:57:26,453 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1879106297] [2023-11-19 04:57:26,453 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-19 04:57:26,453 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-19 04:57:26,470 ERROR L246 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2023-11-19 04:57:26,472 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1192988927] [2023-11-19 04:57:26,473 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-19 04:57:26,473 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-19 04:57:26,473 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ed8734f7-7f84-4268-847c-71b14fc12f5e/bin/utaipan-verify-t7M7D8N6sZ/z3 [2023-11-19 04:57:26,474 INFO L229 MonitoredProcess]: Starting monitored process 10 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ed8734f7-7f84-4268-847c-71b14fc12f5e/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-19 04:57:26,492 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ed8734f7-7f84-4268-847c-71b14fc12f5e/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Waiting until timeout for monitored process [2023-11-19 04:57:26,536 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-19 04:57:26,537 INFO L262 TraceCheckSpWp]: Trace formula consists of 157 conjuncts, 7 conjunts are in the unsatisfiable core [2023-11-19 04:57:26,540 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-19 04:57:26,645 INFO L134 CoverageAnalysis]: Checked inductivity of 46 backedges. 8 proven. 2 refuted. 0 times theorem prover too weak. 36 trivial. 0 not checked. [2023-11-19 04:57:26,645 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-19 04:57:26,740 INFO L134 CoverageAnalysis]: Checked inductivity of 46 backedges. 8 proven. 2 refuted. 0 times theorem prover too weak. 36 trivial. 0 not checked. [2023-11-19 04:57:26,741 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-19 04:57:26,741 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1879106297] [2023-11-19 04:57:26,741 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2023-11-19 04:57:26,741 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1192988927] [2023-11-19 04:57:26,741 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1192988927] provided 0 perfect and 2 imperfect interpolant sequences [2023-11-19 04:57:26,741 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [598693499] [2023-11-19 04:57:26,764 INFO L159 IcfgInterpreter]: Started Sifa with 26 locations of interest [2023-11-19 04:57:26,764 INFO L166 IcfgInterpreter]: Building call graph [2023-11-19 04:57:26,768 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-11-19 04:57:26,773 INFO L176 IcfgInterpreter]: Starting interpretation [2023-11-19 04:57:26,774 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-11-19 04:57:40,631 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 109 for LOIs [2023-11-19 04:57:40,925 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 7 for LOIs [2023-11-19 04:57:40,927 INFO L180 IcfgInterpreter]: Interpretation finished