./Ultimate.py --spec ../../sv-benchmarks/c/properties/unreach-call.prp --file ../../sv-benchmarks/c/verifythis/duplets.c --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for ERROR reachability Using default analysis Version cf1a7837 Calling Ultimate with: /usr/lib/jvm/java-1.11.0-openjdk-amd64/bin/java -Dosgi.configuration.area=/tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dd1d4056-d814-4735-bd98-9b9aeaede0fe/bin/utaipan-verify-NcY6lQBIFX/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dd1d4056-d814-4735-bd98-9b9aeaede0fe/bin/utaipan-verify-NcY6lQBIFX/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dd1d4056-d814-4735-bd98-9b9aeaede0fe/bin/utaipan-verify-NcY6lQBIFX/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dd1d4056-d814-4735-bd98-9b9aeaede0fe/bin/utaipan-verify-NcY6lQBIFX/config/TaipanReach.xml -i ../../sv-benchmarks/c/verifythis/duplets.c -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dd1d4056-d814-4735-bd98-9b9aeaede0fe/bin/utaipan-verify-NcY6lQBIFX/config/svcomp-Reach-32bit-Taipan_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dd1d4056-d814-4735-bd98-9b9aeaede0fe/bin/utaipan-verify-NcY6lQBIFX --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 ac76721ba91522692e2c3e4d1ea27df0200031dd012c5066cc7280e0ae6e2244 --- Real Ultimate output --- This is Ultimate 0.2.3-dev-cf1a783 [2023-11-12 00:13:02,323 INFO L188 SettingsManager]: Resetting all preferences to default values... [2023-11-12 00:13:02,411 INFO L114 SettingsManager]: Loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dd1d4056-d814-4735-bd98-9b9aeaede0fe/bin/utaipan-verify-NcY6lQBIFX/config/svcomp-Reach-32bit-Taipan_Default.epf [2023-11-12 00:13:02,418 WARN L101 SettingsManager]: Preference file contains the following unknown settings: [2023-11-12 00:13:02,419 WARN L103 SettingsManager]: * de.uni_freiburg.informatik.ultimate.core.Log level for class [2023-11-12 00:13:02,452 INFO L130 SettingsManager]: Preferences different from defaults after loading the file: [2023-11-12 00:13:02,453 INFO L151 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2023-11-12 00:13:02,454 INFO L153 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2023-11-12 00:13:02,455 INFO L151 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2023-11-12 00:13:02,455 INFO L153 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2023-11-12 00:13:02,456 INFO L153 SettingsManager]: * User list type=DISABLED [2023-11-12 00:13:02,457 INFO L151 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2023-11-12 00:13:02,458 INFO L153 SettingsManager]: * Explicit value domain=true [2023-11-12 00:13:02,459 INFO L153 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2023-11-12 00:13:02,459 INFO L153 SettingsManager]: * Octagon Domain=false [2023-11-12 00:13:02,460 INFO L153 SettingsManager]: * Abstract domain=CompoundDomain [2023-11-12 00:13:02,461 INFO L153 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2023-11-12 00:13:02,461 INFO L153 SettingsManager]: * Use the RCFG-of-the-future interface=true [2023-11-12 00:13:02,462 INFO L153 SettingsManager]: * Interval Domain=false [2023-11-12 00:13:02,463 INFO L151 SettingsManager]: Preferences of Sifa differ from their defaults: [2023-11-12 00:13:02,463 INFO L153 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2023-11-12 00:13:02,464 INFO L153 SettingsManager]: * Simplification Technique=POLY_PAC [2023-11-12 00:13:02,466 INFO L151 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2023-11-12 00:13:02,466 INFO L153 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2023-11-12 00:13:02,467 INFO L153 SettingsManager]: * sizeof long=4 [2023-11-12 00:13:02,468 INFO L153 SettingsManager]: * Overapproximate operations on floating types=true [2023-11-12 00:13:02,468 INFO L153 SettingsManager]: * sizeof POINTER=4 [2023-11-12 00:13:02,469 INFO L153 SettingsManager]: * Check division by zero=IGNORE [2023-11-12 00:13:02,470 INFO L153 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2023-11-12 00:13:02,471 INFO L153 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2023-11-12 00:13:02,471 INFO L153 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2023-11-12 00:13:02,472 INFO L153 SettingsManager]: * sizeof long double=12 [2023-11-12 00:13:02,473 INFO L153 SettingsManager]: * Check if freed pointer was valid=false [2023-11-12 00:13:02,473 INFO L153 SettingsManager]: * Use constant arrays=true [2023-11-12 00:13:02,474 INFO L151 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2023-11-12 00:13:02,475 INFO L153 SettingsManager]: * SMT solver=External_DefaultMode [2023-11-12 00:13:02,475 INFO L153 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2023-11-12 00:13:02,476 INFO L151 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2023-11-12 00:13:02,476 INFO L153 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2023-11-12 00:13:02,477 INFO L153 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopHeads [2023-11-12 00:13:02,477 INFO L153 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2023-11-12 00:13:02,478 INFO L153 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2023-11-12 00:13:02,478 INFO L153 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2023-11-12 00:13:02,479 INFO L153 SettingsManager]: * Trace refinement exception blacklist=NONE [2023-11-12 00:13:02,479 INFO L153 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2023-11-12 00:13:02,479 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_dd1d4056-d814-4735-bd98-9b9aeaede0fe/bin/utaipan-verify-NcY6lQBIFX/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dd1d4056-d814-4735-bd98-9b9aeaede0fe/bin/utaipan-verify-NcY6lQBIFX Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> ac76721ba91522692e2c3e4d1ea27df0200031dd012c5066cc7280e0ae6e2244 [2023-11-12 00:13:02,813 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2023-11-12 00:13:02,841 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2023-11-12 00:13:02,844 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2023-11-12 00:13:02,846 INFO L270 PluginConnector]: Initializing CDTParser... [2023-11-12 00:13:02,848 INFO L274 PluginConnector]: CDTParser initialized [2023-11-12 00:13:02,851 INFO L431 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dd1d4056-d814-4735-bd98-9b9aeaede0fe/bin/utaipan-verify-NcY6lQBIFX/../../sv-benchmarks/c/verifythis/duplets.c [2023-11-12 00:13:06,158 INFO L533 CDTParser]: Created temporary CDT project at NULL [2023-11-12 00:13:06,412 INFO L384 CDTParser]: Found 1 translation units. [2023-11-12 00:13:06,413 INFO L180 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dd1d4056-d814-4735-bd98-9b9aeaede0fe/sv-benchmarks/c/verifythis/duplets.c [2023-11-12 00:13:06,423 INFO L427 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dd1d4056-d814-4735-bd98-9b9aeaede0fe/bin/utaipan-verify-NcY6lQBIFX/data/a68c3ca8a/8fd7164f96c64c83ad0ca7f833f3a500/FLAG5765868b5 [2023-11-12 00:13:06,446 INFO L435 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dd1d4056-d814-4735-bd98-9b9aeaede0fe/bin/utaipan-verify-NcY6lQBIFX/data/a68c3ca8a/8fd7164f96c64c83ad0ca7f833f3a500 [2023-11-12 00:13:06,455 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2023-11-12 00:13:06,459 INFO L133 ToolchainWalker]: Walking toolchain with 6 elements. [2023-11-12 00:13:06,461 INFO L112 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2023-11-12 00:13:06,461 INFO L270 PluginConnector]: Initializing CACSL2BoogieTranslator... [2023-11-12 00:13:06,467 INFO L274 PluginConnector]: CACSL2BoogieTranslator initialized [2023-11-12 00:13:06,468 INFO L184 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 12.11 12:13:06" (1/1) ... [2023-11-12 00:13:06,469 INFO L204 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@638c613a and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 12.11 12:13:06, skipping insertion in model container [2023-11-12 00:13:06,469 INFO L184 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 12.11 12:13:06" (1/1) ... [2023-11-12 00:13:06,498 INFO L177 MainTranslator]: Built tables and reachable declarations [2023-11-12 00:13:06,679 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_dd1d4056-d814-4735-bd98-9b9aeaede0fe/sv-benchmarks/c/verifythis/duplets.c[485,498] [2023-11-12 00:13:06,705 INFO L209 PostProcessor]: Analyzing one entry point: main [2023-11-12 00:13:06,718 INFO L202 MainTranslator]: Completed pre-run [2023-11-12 00:13:06,730 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_dd1d4056-d814-4735-bd98-9b9aeaede0fe/sv-benchmarks/c/verifythis/duplets.c[485,498] [2023-11-12 00:13:06,744 INFO L209 PostProcessor]: Analyzing one entry point: main [2023-11-12 00:13:06,761 INFO L206 MainTranslator]: Completed translation [2023-11-12 00:13:06,761 INFO L201 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 12.11 12:13:06 WrapperNode [2023-11-12 00:13:06,762 INFO L131 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2023-11-12 00:13:06,763 INFO L112 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2023-11-12 00:13:06,763 INFO L270 PluginConnector]: Initializing Boogie Procedure Inliner... [2023-11-12 00:13:06,763 INFO L274 PluginConnector]: Boogie Procedure Inliner initialized [2023-11-12 00:13:06,771 INFO L184 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 12.11 12:13:06" (1/1) ... [2023-11-12 00:13:06,782 INFO L184 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 12.11 12:13:06" (1/1) ... [2023-11-12 00:13:06,809 INFO L138 Inliner]: procedures = 21, calls = 43, calls flagged for inlining = 5, calls inlined = 5, statements flattened = 123 [2023-11-12 00:13:06,809 INFO L131 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2023-11-12 00:13:06,810 INFO L112 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2023-11-12 00:13:06,810 INFO L270 PluginConnector]: Initializing Boogie Preprocessor... [2023-11-12 00:13:06,810 INFO L274 PluginConnector]: Boogie Preprocessor initialized [2023-11-12 00:13:06,820 INFO L184 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 12.11 12:13:06" (1/1) ... [2023-11-12 00:13:06,820 INFO L184 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 12.11 12:13:06" (1/1) ... [2023-11-12 00:13:06,824 INFO L184 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 12.11 12:13:06" (1/1) ... [2023-11-12 00:13:06,824 INFO L184 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 12.11 12:13:06" (1/1) ... [2023-11-12 00:13:06,833 INFO L184 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 12.11 12:13:06" (1/1) ... [2023-11-12 00:13:06,836 INFO L184 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 12.11 12:13:06" (1/1) ... [2023-11-12 00:13:06,838 INFO L184 PluginConnector]: Executing the observer LTLStepAnnotator from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 12.11 12:13:06" (1/1) ... [2023-11-12 00:13:06,840 INFO L184 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 12.11 12:13:06" (1/1) ... [2023-11-12 00:13:06,843 INFO L131 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2023-11-12 00:13:06,844 INFO L112 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2023-11-12 00:13:06,844 INFO L270 PluginConnector]: Initializing RCFGBuilder... [2023-11-12 00:13:06,844 INFO L274 PluginConnector]: RCFGBuilder initialized [2023-11-12 00:13:06,845 INFO L184 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 12.11 12:13:06" (1/1) ... [2023-11-12 00:13:06,852 INFO L173 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2023-11-12 00:13:06,869 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dd1d4056-d814-4735-bd98-9b9aeaede0fe/bin/utaipan-verify-NcY6lQBIFX/z3 [2023-11-12 00:13:06,883 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dd1d4056-d814-4735-bd98-9b9aeaede0fe/bin/utaipan-verify-NcY6lQBIFX/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2023-11-12 00:13:06,920 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dd1d4056-d814-4735-bd98-9b9aeaede0fe/bin/utaipan-verify-NcY6lQBIFX/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2023-11-12 00:13:06,935 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2023-11-12 00:13:06,935 INFO L130 BoogieDeclarations]: Found specification of procedure assume_abort_if_not [2023-11-12 00:13:06,935 INFO L138 BoogieDeclarations]: Found implementation of procedure assume_abort_if_not [2023-11-12 00:13:06,936 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2023-11-12 00:13:06,936 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2023-11-12 00:13:06,936 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2023-11-12 00:13:06,938 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnHeap [2023-11-12 00:13:06,938 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2023-11-12 00:13:06,939 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2023-11-12 00:13:06,939 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2023-11-12 00:13:06,940 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2023-11-12 00:13:06,940 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2023-11-12 00:13:06,940 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2023-11-12 00:13:07,076 INFO L236 CfgBuilder]: Building ICFG [2023-11-12 00:13:07,079 INFO L262 CfgBuilder]: Building CFG for each procedure with an implementation [2023-11-12 00:13:07,351 INFO L277 CfgBuilder]: Performing block encoding [2023-11-12 00:13:07,442 INFO L297 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2023-11-12 00:13:07,457 INFO L302 CfgBuilder]: Removed 2 assume(true) statements. [2023-11-12 00:13:07,460 INFO L201 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 12.11 12:13:07 BoogieIcfgContainer [2023-11-12 00:13:07,461 INFO L131 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2023-11-12 00:13:07,464 INFO L112 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2023-11-12 00:13:07,466 INFO L270 PluginConnector]: Initializing TraceAbstraction... [2023-11-12 00:13:07,470 INFO L274 PluginConnector]: TraceAbstraction initialized [2023-11-12 00:13:07,471 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 12.11 12:13:06" (1/3) ... [2023-11-12 00:13:07,473 INFO L204 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@139871d8 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 12.11 12:13:07, skipping insertion in model container [2023-11-12 00:13:07,473 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 12.11 12:13:06" (2/3) ... [2023-11-12 00:13:07,474 INFO L204 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@139871d8 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 12.11 12:13:07, skipping insertion in model container [2023-11-12 00:13:07,475 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 12.11 12:13:07" (3/3) ... [2023-11-12 00:13:07,478 INFO L112 eAbstractionObserver]: Analyzing ICFG duplets.c [2023-11-12 00:13:07,499 INFO L204 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2023-11-12 00:13:07,500 INFO L163 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2023-11-12 00:13:07,567 INFO L356 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2023-11-12 00:13:07,575 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;@14996aa8, mLbeIndependenceSettings=[IndependenceType=SEMANTIC, AbstractionType=NONE, UseConditional=false, UseSemiCommutativity=true, Solver=Z3, SolverTimeout=1000ms] [2023-11-12 00:13:07,576 INFO L358 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2023-11-12 00:13:07,580 INFO L276 IsEmpty]: Start isEmpty. Operand has 30 states, 17 states have (on average 1.2941176470588236) internal successors, (22), 18 states have internal predecessors, (22), 9 states have call successors, (9), 2 states have call predecessors, (9), 2 states have return successors, (9), 9 states have call predecessors, (9), 9 states have call successors, (9) [2023-11-12 00:13:07,589 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2023-11-12 00:13:07,590 INFO L187 NwaCegarLoop]: Found error trace [2023-11-12 00:13:07,591 INFO L195 NwaCegarLoop]: trace histogram [4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-12 00:13:07,591 INFO L420 AbstractCegarLoop]: === Iteration 1 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-12 00:13:07,597 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-12 00:13:07,597 INFO L85 PathProgramCache]: Analyzing trace with hash 373269109, now seen corresponding path program 1 times [2023-11-12 00:13:07,608 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-12 00:13:07,609 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [605040543] [2023-11-12 00:13:07,609 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-12 00:13:07,610 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-12 00:13:07,822 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-12 00:13:08,391 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 1 proven. 2 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2023-11-12 00:13:08,391 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-12 00:13:08,392 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [605040543] [2023-11-12 00:13:08,392 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [605040543] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-12 00:13:08,393 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [431895543] [2023-11-12 00:13:08,393 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-12 00:13:08,393 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-12 00:13:08,393 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dd1d4056-d814-4735-bd98-9b9aeaede0fe/bin/utaipan-verify-NcY6lQBIFX/z3 [2023-11-12 00:13:08,399 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dd1d4056-d814-4735-bd98-9b9aeaede0fe/bin/utaipan-verify-NcY6lQBIFX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-12 00:13:08,425 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dd1d4056-d814-4735-bd98-9b9aeaede0fe/bin/utaipan-verify-NcY6lQBIFX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2023-11-12 00:13:08,515 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-12 00:13:08,518 INFO L262 TraceCheckSpWp]: Trace formula consists of 165 conjuncts, 11 conjunts are in the unsatisfiable core [2023-11-12 00:13:08,524 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-12 00:13:08,645 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 2 proven. 1 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2023-11-12 00:13:08,645 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-12 00:13:08,888 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 2 proven. 1 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2023-11-12 00:13:08,889 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [431895543] provided 0 perfect and 2 imperfect interpolant sequences [2023-11-12 00:13:08,889 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [2027462399] [2023-11-12 00:13:08,922 INFO L159 IcfgInterpreter]: Started Sifa with 16 locations of interest [2023-11-12 00:13:08,922 INFO L166 IcfgInterpreter]: Building call graph [2023-11-12 00:13:08,926 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-11-12 00:13:08,932 INFO L176 IcfgInterpreter]: Starting interpretation [2023-11-12 00:13:08,933 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-11-12 00:13:10,701 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 3 for LOIs [2023-11-12 00:13:10,703 INFO L180 IcfgInterpreter]: Interpretation finished [2023-11-12 00:13:11,917 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSifa [2027462399] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-12 00:13:11,918 INFO L185 FreeRefinementEngine]: Found 1 perfect and 3 imperfect interpolant sequences. [2023-11-12 00:13:11,918 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [10] imperfect sequences [6, 6, 6] total 18 [2023-11-12 00:13:11,920 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [464345300] [2023-11-12 00:13:11,921 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-12 00:13:11,926 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 11 states [2023-11-12 00:13:11,926 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-12 00:13:11,955 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2023-11-12 00:13:11,958 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=80, Invalid=226, Unknown=0, NotChecked=0, Total=306 [2023-11-12 00:13:11,960 INFO L87 Difference]: Start difference. First operand has 30 states, 17 states have (on average 1.2941176470588236) internal successors, (22), 18 states have internal predecessors, (22), 9 states have call successors, (9), 2 states have call predecessors, (9), 2 states have return successors, (9), 9 states have call predecessors, (9), 9 states have call successors, (9) Second operand has 11 states, 6 states have (on average 1.5) internal successors, (9), 5 states have internal predecessors, (9), 5 states have call successors, (5), 2 states have call predecessors, (5), 1 states have return successors, (4), 4 states have call predecessors, (4), 4 states have call successors, (4) [2023-11-12 00:13:12,556 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-12 00:13:12,556 INFO L93 Difference]: Finished difference Result 62 states and 94 transitions. [2023-11-12 00:13:12,558 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2023-11-12 00:13:12,559 INFO L78 Accepts]: Start accepts. Automaton has has 11 states, 6 states have (on average 1.5) internal successors, (9), 5 states have internal predecessors, (9), 5 states have call successors, (5), 2 states have call predecessors, (5), 1 states have return successors, (4), 4 states have call predecessors, (4), 4 states have call successors, (4) Word has length 21 [2023-11-12 00:13:12,560 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-12 00:13:12,567 INFO L225 Difference]: With dead ends: 62 [2023-11-12 00:13:12,568 INFO L226 Difference]: Without dead ends: 41 [2023-11-12 00:13:12,571 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 67 GetRequests, 50 SyntacticMatches, 1 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 59 ImplicationChecksByTransitivity, 1.3s TimeCoverageRelationStatistics Valid=80, Invalid=226, Unknown=0, NotChecked=0, Total=306 [2023-11-12 00:13:12,577 INFO L413 NwaCegarLoop]: 15 mSDtfsCounter, 48 mSDsluCounter, 19 mSDsCounter, 0 mSdLazyCounter, 151 mSolverCounterSat, 12 mSolverCounterUnsat, 1 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 53 SdHoareTripleChecker+Valid, 34 SdHoareTripleChecker+Invalid, 164 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 12 IncrementalHoareTripleChecker+Valid, 151 IncrementalHoareTripleChecker+Invalid, 1 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2023-11-12 00:13:12,583 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [53 Valid, 34 Invalid, 164 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [12 Valid, 151 Invalid, 1 Unknown, 0 Unchecked, 0.5s Time] [2023-11-12 00:13:12,601 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 41 states. [2023-11-12 00:13:12,681 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 41 to 29. [2023-11-12 00:13:12,682 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 29 states, 17 states have (on average 1.2352941176470589) internal successors, (21), 18 states have internal predecessors, (21), 9 states have call successors, (9), 2 states have call predecessors, (9), 2 states have return successors, (8), 8 states have call predecessors, (8), 8 states have call successors, (8) [2023-11-12 00:13:12,686 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 29 states to 29 states and 38 transitions. [2023-11-12 00:13:12,687 INFO L78 Accepts]: Start accepts. Automaton has 29 states and 38 transitions. Word has length 21 [2023-11-12 00:13:12,688 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-12 00:13:12,688 INFO L495 AbstractCegarLoop]: Abstraction has 29 states and 38 transitions. [2023-11-12 00:13:12,689 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 11 states, 6 states have (on average 1.5) internal successors, (9), 5 states have internal predecessors, (9), 5 states have call successors, (5), 2 states have call predecessors, (5), 1 states have return successors, (4), 4 states have call predecessors, (4), 4 states have call successors, (4) [2023-11-12 00:13:12,689 INFO L276 IsEmpty]: Start isEmpty. Operand 29 states and 38 transitions. [2023-11-12 00:13:12,691 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 24 [2023-11-12 00:13:12,692 INFO L187 NwaCegarLoop]: Found error trace [2023-11-12 00:13:12,692 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] [2023-11-12 00:13:12,702 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dd1d4056-d814-4735-bd98-9b9aeaede0fe/bin/utaipan-verify-NcY6lQBIFX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0 [2023-11-12 00:13:12,898 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dd1d4056-d814-4735-bd98-9b9aeaede0fe/bin/utaipan-verify-NcY6lQBIFX/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable0 [2023-11-12 00:13:12,898 INFO L420 AbstractCegarLoop]: === Iteration 2 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-12 00:13:12,899 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-12 00:13:12,899 INFO L85 PathProgramCache]: Analyzing trace with hash 737762199, now seen corresponding path program 1 times [2023-11-12 00:13:12,899 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-12 00:13:12,900 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [128254932] [2023-11-12 00:13:12,900 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-12 00:13:12,900 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-12 00:13:12,947 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-12 00:13:13,500 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 4 proven. 0 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2023-11-12 00:13:13,501 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-12 00:13:13,502 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [128254932] [2023-11-12 00:13:13,503 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [128254932] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-12 00:13:13,503 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-11-12 00:13:13,503 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [9] imperfect sequences [] total 9 [2023-11-12 00:13:13,504 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1470572068] [2023-11-12 00:13:13,504 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-12 00:13:13,505 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 9 states [2023-11-12 00:13:13,506 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-12 00:13:13,508 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2023-11-12 00:13:13,509 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=16, Invalid=56, Unknown=0, NotChecked=0, Total=72 [2023-11-12 00:13:13,510 INFO L87 Difference]: Start difference. First operand 29 states and 38 transitions. Second operand has 9 states, 5 states have (on average 2.4) internal successors, (12), 6 states have internal predecessors, (12), 5 states have call successors, (5), 2 states have call predecessors, (5), 2 states have return successors, (4), 4 states have call predecessors, (4), 4 states have call successors, (4) [2023-11-12 00:13:13,813 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-12 00:13:13,815 INFO L93 Difference]: Finished difference Result 52 states and 70 transitions. [2023-11-12 00:13:13,815 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2023-11-12 00:13:13,816 INFO L78 Accepts]: Start accepts. Automaton has has 9 states, 5 states have (on average 2.4) internal successors, (12), 6 states have internal predecessors, (12), 5 states have call successors, (5), 2 states have call predecessors, (5), 2 states have return successors, (4), 4 states have call predecessors, (4), 4 states have call successors, (4) Word has length 23 [2023-11-12 00:13:13,816 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-12 00:13:13,819 INFO L225 Difference]: With dead ends: 52 [2023-11-12 00:13:13,819 INFO L226 Difference]: Without dead ends: 33 [2023-11-12 00:13:13,821 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 15 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 7 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=38, Invalid=118, Unknown=0, NotChecked=0, Total=156 [2023-11-12 00:13:13,822 INFO L413 NwaCegarLoop]: 21 mSDtfsCounter, 7 mSDsluCounter, 141 mSDsCounter, 0 mSdLazyCounter, 122 mSolverCounterSat, 5 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 8 SdHoareTripleChecker+Valid, 162 SdHoareTripleChecker+Invalid, 127 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 5 IncrementalHoareTripleChecker+Valid, 122 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-11-12 00:13:13,828 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [8 Valid, 162 Invalid, 127 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [5 Valid, 122 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-11-12 00:13:13,830 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 33 states. [2023-11-12 00:13:13,851 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 33 to 30. [2023-11-12 00:13:13,852 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 30 states, 18 states have (on average 1.2222222222222223) internal successors, (22), 19 states have internal predecessors, (22), 9 states have call successors, (9), 2 states have call predecessors, (9), 2 states have return successors, (8), 8 states have call predecessors, (8), 8 states have call successors, (8) [2023-11-12 00:13:13,856 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 30 states to 30 states and 39 transitions. [2023-11-12 00:13:13,856 INFO L78 Accepts]: Start accepts. Automaton has 30 states and 39 transitions. Word has length 23 [2023-11-12 00:13:13,857 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-12 00:13:13,857 INFO L495 AbstractCegarLoop]: Abstraction has 30 states and 39 transitions. [2023-11-12 00:13:13,857 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 9 states, 5 states have (on average 2.4) internal successors, (12), 6 states have internal predecessors, (12), 5 states have call successors, (5), 2 states have call predecessors, (5), 2 states have return successors, (4), 4 states have call predecessors, (4), 4 states have call successors, (4) [2023-11-12 00:13:13,858 INFO L276 IsEmpty]: Start isEmpty. Operand 30 states and 39 transitions. [2023-11-12 00:13:13,859 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 24 [2023-11-12 00:13:13,859 INFO L187 NwaCegarLoop]: Found error trace [2023-11-12 00:13:13,862 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] [2023-11-12 00:13:13,863 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2023-11-12 00:13:13,863 INFO L420 AbstractCegarLoop]: === Iteration 3 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-12 00:13:13,864 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-12 00:13:13,864 INFO L85 PathProgramCache]: Analyzing trace with hash -81184906, now seen corresponding path program 1 times [2023-11-12 00:13:13,865 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-12 00:13:13,866 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1800683433] [2023-11-12 00:13:13,866 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-12 00:13:13,867 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-12 00:13:13,901 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-12 00:13:13,977 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2023-11-12 00:13:13,978 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-12 00:13:13,978 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1800683433] [2023-11-12 00:13:13,978 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1800683433] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-12 00:13:13,978 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-11-12 00:13:13,979 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2023-11-12 00:13:13,979 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1871632541] [2023-11-12 00:13:13,979 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-12 00:13:13,980 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2023-11-12 00:13:13,980 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-12 00:13:13,981 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2023-11-12 00:13:13,981 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2023-11-12 00:13:13,982 INFO L87 Difference]: Start difference. First operand 30 states and 39 transitions. Second operand has 6 states, 5 states have (on average 2.2) internal successors, (11), 5 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) [2023-11-12 00:13:14,115 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-12 00:13:14,116 INFO L93 Difference]: Finished difference Result 46 states and 58 transitions. [2023-11-12 00:13:14,116 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2023-11-12 00:13:14,116 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 5 states have (on average 2.2) internal successors, (11), 5 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 [2023-11-12 00:13:14,117 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-12 00:13:14,118 INFO L225 Difference]: With dead ends: 46 [2023-11-12 00:13:14,119 INFO L226 Difference]: Without dead ends: 44 [2023-11-12 00:13:14,119 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 8 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=17, Invalid=39, Unknown=0, NotChecked=0, Total=56 [2023-11-12 00:13:14,122 INFO L413 NwaCegarLoop]: 27 mSDtfsCounter, 14 mSDsluCounter, 99 mSDsCounter, 0 mSdLazyCounter, 69 mSolverCounterSat, 8 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 14 SdHoareTripleChecker+Valid, 126 SdHoareTripleChecker+Invalid, 77 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 8 IncrementalHoareTripleChecker+Valid, 69 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-11-12 00:13:14,124 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [14 Valid, 126 Invalid, 77 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [8 Valid, 69 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-11-12 00:13:14,126 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 44 states. [2023-11-12 00:13:14,155 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 44 to 36. [2023-11-12 00:13:14,156 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 36 states, 22 states have (on average 1.1818181818181819) internal successors, (26), 24 states have internal predecessors, (26), 10 states have call successors, (10), 3 states have call predecessors, (10), 3 states have return successors, (9), 8 states have call predecessors, (9), 9 states have call successors, (9) [2023-11-12 00:13:14,160 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 36 states to 36 states and 45 transitions. [2023-11-12 00:13:14,161 INFO L78 Accepts]: Start accepts. Automaton has 36 states and 45 transitions. Word has length 23 [2023-11-12 00:13:14,161 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-12 00:13:14,162 INFO L495 AbstractCegarLoop]: Abstraction has 36 states and 45 transitions. [2023-11-12 00:13:14,162 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 5 states have (on average 2.2) internal successors, (11), 5 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) [2023-11-12 00:13:14,162 INFO L276 IsEmpty]: Start isEmpty. Operand 36 states and 45 transitions. [2023-11-12 00:13:14,163 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 26 [2023-11-12 00:13:14,164 INFO L187 NwaCegarLoop]: Found error trace [2023-11-12 00:13:14,164 INFO L195 NwaCegarLoop]: trace histogram [4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-12 00:13:14,164 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2023-11-12 00:13:14,164 INFO L420 AbstractCegarLoop]: === Iteration 4 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-12 00:13:14,165 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-12 00:13:14,165 INFO L85 PathProgramCache]: Analyzing trace with hash -408908376, now seen corresponding path program 1 times [2023-11-12 00:13:14,166 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-12 00:13:14,167 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1889259086] [2023-11-12 00:13:14,167 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-12 00:13:14,169 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-12 00:13:14,201 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-12 00:13:14,266 INFO L134 CoverageAnalysis]: Checked inductivity of 14 backedges. 1 proven. 1 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2023-11-12 00:13:14,266 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-12 00:13:14,270 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1889259086] [2023-11-12 00:13:14,270 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1889259086] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-12 00:13:14,270 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2040770808] [2023-11-12 00:13:14,270 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-12 00:13:14,271 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-12 00:13:14,271 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dd1d4056-d814-4735-bd98-9b9aeaede0fe/bin/utaipan-verify-NcY6lQBIFX/z3 [2023-11-12 00:13:14,272 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dd1d4056-d814-4735-bd98-9b9aeaede0fe/bin/utaipan-verify-NcY6lQBIFX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-12 00:13:14,304 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dd1d4056-d814-4735-bd98-9b9aeaede0fe/bin/utaipan-verify-NcY6lQBIFX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2023-11-12 00:13:14,375 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-12 00:13:14,376 INFO L262 TraceCheckSpWp]: Trace formula consists of 179 conjuncts, 4 conjunts are in the unsatisfiable core [2023-11-12 00:13:14,380 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-12 00:13:14,392 INFO L134 CoverageAnalysis]: Checked inductivity of 14 backedges. 1 proven. 1 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2023-11-12 00:13:14,392 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-12 00:13:14,453 INFO L134 CoverageAnalysis]: Checked inductivity of 14 backedges. 1 proven. 1 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2023-11-12 00:13:14,453 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2040770808] provided 0 perfect and 2 imperfect interpolant sequences [2023-11-12 00:13:14,454 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1496252630] [2023-11-12 00:13:14,457 INFO L159 IcfgInterpreter]: Started Sifa with 18 locations of interest [2023-11-12 00:13:14,458 INFO L166 IcfgInterpreter]: Building call graph [2023-11-12 00:13:14,458 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-11-12 00:13:14,459 INFO L176 IcfgInterpreter]: Starting interpretation [2023-11-12 00:13:14,459 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-11-12 00:13:19,306 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 7 for LOIs [2023-11-12 00:13:19,311 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 3 for LOIs [2023-11-12 00:13:19,313 INFO L180 IcfgInterpreter]: Interpretation finished [2023-11-12 00:13:21,320 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '719#(and (<= 1 |#StackHeapBarrier|) (= |__VERIFIER_assert_#in~cond| 0) (= __VERIFIER_assert_~cond 0))' at error location [2023-11-12 00:13:21,320 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-11-12 00:13:21,321 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-11-12 00:13:21,321 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 5, 5] total 5 [2023-11-12 00:13:21,321 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1315606984] [2023-11-12 00:13:21,321 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-11-12 00:13:21,322 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2023-11-12 00:13:21,322 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-12 00:13:21,323 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2023-11-12 00:13:21,323 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=72, Invalid=308, Unknown=0, NotChecked=0, Total=380 [2023-11-12 00:13:21,323 INFO L87 Difference]: Start difference. First operand 36 states and 45 transitions. Second operand has 5 states, 5 states have (on average 2.6) internal successors, (13), 5 states have internal predecessors, (13), 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) [2023-11-12 00:13:21,415 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-12 00:13:21,415 INFO L93 Difference]: Finished difference Result 54 states and 68 transitions. [2023-11-12 00:13:21,416 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2023-11-12 00:13:21,416 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 2.6) internal successors, (13), 5 states have internal predecessors, (13), 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 25 [2023-11-12 00:13:21,417 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-12 00:13:21,419 INFO L225 Difference]: With dead ends: 54 [2023-11-12 00:13:21,420 INFO L226 Difference]: Without dead ends: 38 [2023-11-12 00:13:21,420 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 80 GetRequests, 57 SyntacticMatches, 3 SemanticMatches, 20 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 96 ImplicationChecksByTransitivity, 2.1s TimeCoverageRelationStatistics Valid=82, Invalid=380, Unknown=0, NotChecked=0, Total=462 [2023-11-12 00:13:21,422 INFO L413 NwaCegarLoop]: 26 mSDtfsCounter, 4 mSDsluCounter, 48 mSDsCounter, 0 mSdLazyCounter, 34 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 4 SdHoareTripleChecker+Valid, 74 SdHoareTripleChecker+Invalid, 37 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 34 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2023-11-12 00:13:21,422 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [4 Valid, 74 Invalid, 37 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 34 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2023-11-12 00:13:21,423 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 38 states. [2023-11-12 00:13:21,439 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 38 to 38. [2023-11-12 00:13:21,440 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 38 states, 24 states have (on average 1.2083333333333333) internal successors, (29), 26 states have internal predecessors, (29), 10 states have call successors, (10), 3 states have call predecessors, (10), 3 states have return successors, (9), 8 states have call predecessors, (9), 9 states have call successors, (9) [2023-11-12 00:13:21,441 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 38 states to 38 states and 48 transitions. [2023-11-12 00:13:21,441 INFO L78 Accepts]: Start accepts. Automaton has 38 states and 48 transitions. Word has length 25 [2023-11-12 00:13:21,442 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-12 00:13:21,442 INFO L495 AbstractCegarLoop]: Abstraction has 38 states and 48 transitions. [2023-11-12 00:13:21,442 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 2.6) internal successors, (13), 5 states have internal predecessors, (13), 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) [2023-11-12 00:13:21,442 INFO L276 IsEmpty]: Start isEmpty. Operand 38 states and 48 transitions. [2023-11-12 00:13:21,443 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2023-11-12 00:13:21,443 INFO L187 NwaCegarLoop]: Found error trace [2023-11-12 00:13:21,444 INFO L195 NwaCegarLoop]: trace histogram [4, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-12 00:13:21,450 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dd1d4056-d814-4735-bd98-9b9aeaede0fe/bin/utaipan-verify-NcY6lQBIFX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Forceful destruction successful, exit code 0 [2023-11-12 00:13:21,650 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3,3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dd1d4056-d814-4735-bd98-9b9aeaede0fe/bin/utaipan-verify-NcY6lQBIFX/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-12 00:13:21,650 INFO L420 AbstractCegarLoop]: === Iteration 5 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-12 00:13:21,651 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-12 00:13:21,651 INFO L85 PathProgramCache]: Analyzing trace with hash 684475914, now seen corresponding path program 2 times [2023-11-12 00:13:21,651 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-12 00:13:21,651 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1207684275] [2023-11-12 00:13:21,651 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-12 00:13:21,651 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-12 00:13:21,735 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-12 00:13:22,697 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 7 proven. 1 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2023-11-12 00:13:22,698 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-12 00:13:22,698 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1207684275] [2023-11-12 00:13:22,698 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1207684275] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-12 00:13:22,698 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1440399819] [2023-11-12 00:13:22,698 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2023-11-12 00:13:22,699 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-12 00:13:22,699 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dd1d4056-d814-4735-bd98-9b9aeaede0fe/bin/utaipan-verify-NcY6lQBIFX/z3 [2023-11-12 00:13:22,700 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dd1d4056-d814-4735-bd98-9b9aeaede0fe/bin/utaipan-verify-NcY6lQBIFX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-12 00:13:22,725 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dd1d4056-d814-4735-bd98-9b9aeaede0fe/bin/utaipan-verify-NcY6lQBIFX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2023-11-12 00:13:22,803 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2023-11-12 00:13:22,803 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-11-12 00:13:22,805 INFO L262 TraceCheckSpWp]: Trace formula consists of 185 conjuncts, 53 conjunts are in the unsatisfiable core [2023-11-12 00:13:22,809 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-12 00:13:23,071 INFO L322 Elim1Store]: treesize reduction 29, result has 39.6 percent of original size [2023-11-12 00:13:23,072 INFO L351 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 1 case distinctions, treesize of input 38 treesize of output 19 [2023-11-12 00:13:23,783 INFO L322 Elim1Store]: treesize reduction 8, result has 82.2 percent of original size [2023-11-12 00:13:23,784 INFO L351 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 4 select indices, 4 select index equivalence classes, 0 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 6 case distinctions, treesize of input 43 treesize of output 46 [2023-11-12 00:13:24,021 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 7 proven. 1 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2023-11-12 00:13:24,022 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-12 00:13:24,215 INFO L322 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2023-11-12 00:13:24,216 INFO L351 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 503 treesize of output 435 [2023-11-12 00:13:29,065 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 7 proven. 1 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2023-11-12 00:13:29,066 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1440399819] provided 0 perfect and 2 imperfect interpolant sequences [2023-11-12 00:13:29,066 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [2108123958] [2023-11-12 00:13:29,071 INFO L159 IcfgInterpreter]: Started Sifa with 18 locations of interest [2023-11-12 00:13:29,071 INFO L166 IcfgInterpreter]: Building call graph [2023-11-12 00:13:29,072 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-11-12 00:13:29,072 INFO L176 IcfgInterpreter]: Starting interpretation [2023-11-12 00:13:29,072 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-11-12 00:13:32,723 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 7 for LOIs [2023-11-12 00:13:32,727 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 3 for LOIs [2023-11-12 00:13:32,729 INFO L180 IcfgInterpreter]: Interpretation finished [2023-11-12 00:13:34,829 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '1057#(and (<= 1 |#StackHeapBarrier|) (= |__VERIFIER_assert_#in~cond| 0) (= __VERIFIER_assert_~cond 0))' at error location [2023-11-12 00:13:34,829 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-11-12 00:13:34,830 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-11-12 00:13:34,830 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11, 11] total 27 [2023-11-12 00:13:34,830 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1212178679] [2023-11-12 00:13:34,830 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-11-12 00:13:34,831 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 27 states [2023-11-12 00:13:34,831 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-12 00:13:34,832 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 27 interpolants. [2023-11-12 00:13:34,833 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=171, Invalid=1469, Unknown=0, NotChecked=0, Total=1640 [2023-11-12 00:13:34,833 INFO L87 Difference]: Start difference. First operand 38 states and 48 transitions. Second operand has 27 states, 17 states have (on average 1.6470588235294117) internal successors, (28), 18 states have internal predecessors, (28), 11 states have call successors, (11), 2 states have call predecessors, (11), 2 states have return successors, (10), 10 states have call predecessors, (10), 10 states have call successors, (10) [2023-11-12 00:13:35,704 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-12 00:13:35,704 INFO L93 Difference]: Finished difference Result 72 states and 94 transitions. [2023-11-12 00:13:35,707 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2023-11-12 00:13:35,707 INFO L78 Accepts]: Start accepts. Automaton has has 27 states, 17 states have (on average 1.6470588235294117) internal successors, (28), 18 states have internal predecessors, (28), 11 states have call successors, (11), 2 states have call predecessors, (11), 2 states have return successors, (10), 10 states have call predecessors, (10), 10 states have call successors, (10) Word has length 27 [2023-11-12 00:13:35,707 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-12 00:13:35,708 INFO L225 Difference]: With dead ends: 72 [2023-11-12 00:13:35,708 INFO L226 Difference]: Without dead ends: 45 [2023-11-12 00:13:35,710 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 102 GetRequests, 53 SyntacticMatches, 0 SemanticMatches, 49 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 562 ImplicationChecksByTransitivity, 4.3s TimeCoverageRelationStatistics Valid=288, Invalid=2262, Unknown=0, NotChecked=0, Total=2550 [2023-11-12 00:13:35,711 INFO L413 NwaCegarLoop]: 21 mSDtfsCounter, 33 mSDsluCounter, 231 mSDsCounter, 0 mSdLazyCounter, 214 mSolverCounterSat, 11 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 33 SdHoareTripleChecker+Valid, 252 SdHoareTripleChecker+Invalid, 225 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 11 IncrementalHoareTripleChecker+Valid, 214 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2023-11-12 00:13:35,711 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [33 Valid, 252 Invalid, 225 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [11 Valid, 214 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2023-11-12 00:13:35,712 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 45 states. [2023-11-12 00:13:35,730 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 45 to 40. [2023-11-12 00:13:35,730 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 40 states, 26 states have (on average 1.2307692307692308) internal successors, (32), 28 states have internal predecessors, (32), 10 states have call successors, (10), 3 states have call predecessors, (10), 3 states have return successors, (9), 8 states have call predecessors, (9), 9 states have call successors, (9) [2023-11-12 00:13:35,731 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 40 states to 40 states and 51 transitions. [2023-11-12 00:13:35,731 INFO L78 Accepts]: Start accepts. Automaton has 40 states and 51 transitions. Word has length 27 [2023-11-12 00:13:35,731 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-12 00:13:35,731 INFO L495 AbstractCegarLoop]: Abstraction has 40 states and 51 transitions. [2023-11-12 00:13:35,732 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 27 states, 17 states have (on average 1.6470588235294117) internal successors, (28), 18 states have internal predecessors, (28), 11 states have call successors, (11), 2 states have call predecessors, (11), 2 states have return successors, (10), 10 states have call predecessors, (10), 10 states have call successors, (10) [2023-11-12 00:13:35,732 INFO L276 IsEmpty]: Start isEmpty. Operand 40 states and 51 transitions. [2023-11-12 00:13:35,733 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 30 [2023-11-12 00:13:35,733 INFO L187 NwaCegarLoop]: Found error trace [2023-11-12 00:13:35,733 INFO L195 NwaCegarLoop]: trace histogram [4, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-12 00:13:35,744 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dd1d4056-d814-4735-bd98-9b9aeaede0fe/bin/utaipan-verify-NcY6lQBIFX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Forceful destruction successful, exit code 0 [2023-11-12 00:13:35,939 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dd1d4056-d814-4735-bd98-9b9aeaede0fe/bin/utaipan-verify-NcY6lQBIFX/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-12 00:13:35,940 INFO L420 AbstractCegarLoop]: === Iteration 6 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-12 00:13:35,940 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-12 00:13:35,940 INFO L85 PathProgramCache]: Analyzing trace with hash 1727445652, now seen corresponding path program 1 times [2023-11-12 00:13:35,940 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-12 00:13:35,940 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1532014796] [2023-11-12 00:13:35,940 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-12 00:13:35,940 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-12 00:13:35,961 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-12 00:13:36,462 INFO L134 CoverageAnalysis]: Checked inductivity of 14 backedges. 1 proven. 1 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2023-11-12 00:13:36,463 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-12 00:13:36,463 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1532014796] [2023-11-12 00:13:36,463 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1532014796] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-12 00:13:36,463 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [970013515] [2023-11-12 00:13:36,464 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-12 00:13:36,464 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-12 00:13:36,464 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dd1d4056-d814-4735-bd98-9b9aeaede0fe/bin/utaipan-verify-NcY6lQBIFX/z3 [2023-11-12 00:13:36,465 INFO L229 MonitoredProcess]: Starting monitored process 5 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dd1d4056-d814-4735-bd98-9b9aeaede0fe/bin/utaipan-verify-NcY6lQBIFX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-12 00:13:36,471 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dd1d4056-d814-4735-bd98-9b9aeaede0fe/bin/utaipan-verify-NcY6lQBIFX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2023-11-12 00:13:36,569 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-12 00:13:36,571 INFO L262 TraceCheckSpWp]: Trace formula consists of 194 conjuncts, 43 conjunts are in the unsatisfiable core [2023-11-12 00:13:36,577 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-12 00:13:36,589 INFO L351 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 10 treesize of output 8 [2023-11-12 00:13:36,730 INFO L351 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 16 [2023-11-12 00:13:36,737 INFO L351 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 25 treesize of output 18 [2023-11-12 00:13:37,046 INFO L322 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2023-11-12 00:13:37,047 INFO L351 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 63 treesize of output 51 [2023-11-12 00:13:37,125 INFO L134 CoverageAnalysis]: Checked inductivity of 14 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2023-11-12 00:13:37,125 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-12 00:13:37,376 INFO L322 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2023-11-12 00:13:37,376 INFO L351 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 20 treesize of output 21 [2023-11-12 00:13:37,386 INFO L322 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2023-11-12 00:13:37,387 INFO L351 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 30 treesize of output 33 [2023-11-12 00:13:37,403 INFO L351 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 7 treesize of output 5 [2023-11-12 00:13:37,410 INFO L322 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2023-11-12 00:13:37,411 INFO L351 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 18 treesize of output 19 [2023-11-12 00:13:37,414 INFO L173 IndexEqualityManager]: detected equality via solver [2023-11-12 00:13:37,417 INFO L351 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 18 treesize of output 10 [2023-11-12 00:13:37,638 INFO L134 CoverageAnalysis]: Checked inductivity of 14 backedges. 1 proven. 1 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2023-11-12 00:13:37,638 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [970013515] provided 0 perfect and 2 imperfect interpolant sequences [2023-11-12 00:13:37,638 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1866906422] [2023-11-12 00:13:37,642 INFO L159 IcfgInterpreter]: Started Sifa with 22 locations of interest [2023-11-12 00:13:37,642 INFO L166 IcfgInterpreter]: Building call graph [2023-11-12 00:13:37,643 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-11-12 00:13:37,643 INFO L176 IcfgInterpreter]: Starting interpretation [2023-11-12 00:13:37,643 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-11-12 00:13:38,922 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 197 for LOIs [2023-11-12 00:13:39,468 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 3 for LOIs [2023-11-12 00:13:39,470 INFO L180 IcfgInterpreter]: Interpretation finished