./Ultimate.py --spec ../../sv-benchmarks/c/properties/unreach-call.prp --file ../../sv-benchmarks/c/array-crafted/zero_sum_const_m4.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_3e23aaf8-3947-48bf-ae73-c93202482a68/bin/utaipan-verify-t7M7D8N6sZ/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3e23aaf8-3947-48bf-ae73-c93202482a68/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_3e23aaf8-3947-48bf-ae73-c93202482a68/bin/utaipan-verify-t7M7D8N6sZ/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3e23aaf8-3947-48bf-ae73-c93202482a68/bin/utaipan-verify-t7M7D8N6sZ/config/TaipanReach.xml -i ../../sv-benchmarks/c/array-crafted/zero_sum_const_m4.c -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3e23aaf8-3947-48bf-ae73-c93202482a68/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_3e23aaf8-3947-48bf-ae73-c93202482a68/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 aec2f9127d2f09ac657db5f4ff454a031f6027c12ee4edfdaac8d9dd392f7955 --- Real Ultimate output --- This is Ultimate 0.2.3-dev-9bd2c7f [2023-11-19 05:08:17,357 INFO L188 SettingsManager]: Resetting all preferences to default values... [2023-11-19 05:08:17,479 INFO L114 SettingsManager]: Loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3e23aaf8-3947-48bf-ae73-c93202482a68/bin/utaipan-verify-t7M7D8N6sZ/config/svcomp-Reach-32bit-Taipan_Default.epf [2023-11-19 05:08:17,487 WARN L101 SettingsManager]: Preference file contains the following unknown settings: [2023-11-19 05:08:17,488 WARN L103 SettingsManager]: * de.uni_freiburg.informatik.ultimate.core.Log level for class [2023-11-19 05:08:17,526 INFO L130 SettingsManager]: Preferences different from defaults after loading the file: [2023-11-19 05:08:17,527 INFO L151 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2023-11-19 05:08:17,528 INFO L153 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2023-11-19 05:08:17,529 INFO L151 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2023-11-19 05:08:17,534 INFO L153 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2023-11-19 05:08:17,534 INFO L153 SettingsManager]: * User list type=DISABLED [2023-11-19 05:08:17,535 INFO L151 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2023-11-19 05:08:17,536 INFO L153 SettingsManager]: * Explicit value domain=true [2023-11-19 05:08:17,538 INFO L153 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2023-11-19 05:08:17,538 INFO L153 SettingsManager]: * Octagon Domain=false [2023-11-19 05:08:17,539 INFO L153 SettingsManager]: * Abstract domain=CompoundDomain [2023-11-19 05:08:17,539 INFO L153 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2023-11-19 05:08:17,540 INFO L153 SettingsManager]: * Use the RCFG-of-the-future interface=true [2023-11-19 05:08:17,540 INFO L153 SettingsManager]: * Interval Domain=false [2023-11-19 05:08:17,541 INFO L151 SettingsManager]: Preferences of Sifa differ from their defaults: [2023-11-19 05:08:17,541 INFO L153 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2023-11-19 05:08:17,542 INFO L153 SettingsManager]: * Simplification Technique=POLY_PAC [2023-11-19 05:08:17,543 INFO L151 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2023-11-19 05:08:17,544 INFO L153 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2023-11-19 05:08:17,544 INFO L153 SettingsManager]: * sizeof long=4 [2023-11-19 05:08:17,544 INFO L153 SettingsManager]: * Overapproximate operations on floating types=true [2023-11-19 05:08:17,545 INFO L153 SettingsManager]: * sizeof POINTER=4 [2023-11-19 05:08:17,545 INFO L153 SettingsManager]: * Check division by zero=IGNORE [2023-11-19 05:08:17,546 INFO L153 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2023-11-19 05:08:17,546 INFO L153 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2023-11-19 05:08:17,547 INFO L153 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2023-11-19 05:08:17,548 INFO L153 SettingsManager]: * sizeof long double=12 [2023-11-19 05:08:17,548 INFO L153 SettingsManager]: * Check if freed pointer was valid=false [2023-11-19 05:08:17,548 INFO L153 SettingsManager]: * Use constant arrays=true [2023-11-19 05:08:17,548 INFO L151 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2023-11-19 05:08:17,549 INFO L153 SettingsManager]: * SMT solver=External_DefaultMode [2023-11-19 05:08:17,549 INFO L153 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2023-11-19 05:08:17,549 INFO L151 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2023-11-19 05:08:17,550 INFO L153 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2023-11-19 05:08:17,550 INFO L153 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopHeads [2023-11-19 05:08:17,550 INFO L153 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2023-11-19 05:08:17,551 INFO L153 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2023-11-19 05:08:17,551 INFO L153 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2023-11-19 05:08:17,551 INFO L153 SettingsManager]: * Trace refinement exception blacklist=NONE [2023-11-19 05:08:17,552 INFO L153 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2023-11-19 05:08:17,552 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_3e23aaf8-3947-48bf-ae73-c93202482a68/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3e23aaf8-3947-48bf-ae73-c93202482a68/bin/utaipan-verify-t7M7D8N6sZ Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> aec2f9127d2f09ac657db5f4ff454a031f6027c12ee4edfdaac8d9dd392f7955 [2023-11-19 05:08:17,824 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2023-11-19 05:08:17,858 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2023-11-19 05:08:17,861 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2023-11-19 05:08:17,862 INFO L270 PluginConnector]: Initializing CDTParser... [2023-11-19 05:08:17,863 INFO L274 PluginConnector]: CDTParser initialized [2023-11-19 05:08:17,865 INFO L431 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3e23aaf8-3947-48bf-ae73-c93202482a68/bin/utaipan-verify-t7M7D8N6sZ/../../sv-benchmarks/c/array-crafted/zero_sum_const_m4.c [2023-11-19 05:08:21,146 INFO L533 CDTParser]: Created temporary CDT project at NULL [2023-11-19 05:08:21,413 INFO L384 CDTParser]: Found 1 translation units. [2023-11-19 05:08:21,414 INFO L180 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3e23aaf8-3947-48bf-ae73-c93202482a68/sv-benchmarks/c/array-crafted/zero_sum_const_m4.c [2023-11-19 05:08:21,427 INFO L427 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3e23aaf8-3947-48bf-ae73-c93202482a68/bin/utaipan-verify-t7M7D8N6sZ/data/344c2b7e9/e9f54c2915e3418dbd349c7ecac6d875/FLAGccc855c41 [2023-11-19 05:08:21,441 INFO L435 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3e23aaf8-3947-48bf-ae73-c93202482a68/bin/utaipan-verify-t7M7D8N6sZ/data/344c2b7e9/e9f54c2915e3418dbd349c7ecac6d875 [2023-11-19 05:08:21,444 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2023-11-19 05:08:21,445 INFO L133 ToolchainWalker]: Walking toolchain with 6 elements. [2023-11-19 05:08:21,447 INFO L112 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2023-11-19 05:08:21,447 INFO L270 PluginConnector]: Initializing CACSL2BoogieTranslator... [2023-11-19 05:08:21,452 INFO L274 PluginConnector]: CACSL2BoogieTranslator initialized [2023-11-19 05:08:21,453 INFO L184 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 19.11 05:08:21" (1/1) ... [2023-11-19 05:08:21,454 INFO L204 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@6b766e66 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 05:08:21, skipping insertion in model container [2023-11-19 05:08:21,455 INFO L184 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 19.11 05:08:21" (1/1) ... [2023-11-19 05:08:21,488 INFO L177 MainTranslator]: Built tables and reachable declarations [2023-11-19 05:08:21,668 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_3e23aaf8-3947-48bf-ae73-c93202482a68/sv-benchmarks/c/array-crafted/zero_sum_const_m4.c[408,421] [2023-11-19 05:08:21,692 INFO L209 PostProcessor]: Analyzing one entry point: main [2023-11-19 05:08:21,703 INFO L202 MainTranslator]: Completed pre-run [2023-11-19 05:08:21,715 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_3e23aaf8-3947-48bf-ae73-c93202482a68/sv-benchmarks/c/array-crafted/zero_sum_const_m4.c[408,421] [2023-11-19 05:08:21,726 INFO L209 PostProcessor]: Analyzing one entry point: main [2023-11-19 05:08:21,742 INFO L206 MainTranslator]: Completed translation [2023-11-19 05:08:21,743 INFO L201 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 05:08:21 WrapperNode [2023-11-19 05:08:21,743 INFO L131 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2023-11-19 05:08:21,744 INFO L112 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2023-11-19 05:08:21,744 INFO L270 PluginConnector]: Initializing Boogie Procedure Inliner... [2023-11-19 05:08:21,745 INFO L274 PluginConnector]: Boogie Procedure Inliner initialized [2023-11-19 05:08:21,752 INFO L184 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 05:08:21" (1/1) ... [2023-11-19 05:08:21,758 INFO L184 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 05:08:21" (1/1) ... [2023-11-19 05:08:21,795 INFO L138 Inliner]: procedures = 16, calls = 18, calls flagged for inlining = 3, calls inlined = 3, statements flattened = 127 [2023-11-19 05:08:21,796 INFO L131 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2023-11-19 05:08:21,797 INFO L112 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2023-11-19 05:08:21,797 INFO L270 PluginConnector]: Initializing Boogie Preprocessor... [2023-11-19 05:08:21,797 INFO L274 PluginConnector]: Boogie Preprocessor initialized [2023-11-19 05:08:21,807 INFO L184 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 05:08:21" (1/1) ... [2023-11-19 05:08:21,807 INFO L184 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 05:08:21" (1/1) ... [2023-11-19 05:08:21,810 INFO L184 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 05:08:21" (1/1) ... [2023-11-19 05:08:21,810 INFO L184 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 05:08:21" (1/1) ... [2023-11-19 05:08:21,816 INFO L184 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 05:08:21" (1/1) ... [2023-11-19 05:08:21,820 INFO L184 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 05:08:21" (1/1) ... [2023-11-19 05:08:21,822 INFO L184 PluginConnector]: Executing the observer LTLStepAnnotator from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 05:08:21" (1/1) ... [2023-11-19 05:08:21,824 INFO L184 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 05:08:21" (1/1) ... [2023-11-19 05:08:21,826 INFO L131 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2023-11-19 05:08:21,828 INFO L112 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2023-11-19 05:08:21,828 INFO L270 PluginConnector]: Initializing RCFGBuilder... [2023-11-19 05:08:21,828 INFO L274 PluginConnector]: RCFGBuilder initialized [2023-11-19 05:08:21,829 INFO L184 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 05:08:21" (1/1) ... [2023-11-19 05:08:21,835 INFO L173 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2023-11-19 05:08:21,851 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3e23aaf8-3947-48bf-ae73-c93202482a68/bin/utaipan-verify-t7M7D8N6sZ/z3 [2023-11-19 05:08:21,864 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3e23aaf8-3947-48bf-ae73-c93202482a68/bin/utaipan-verify-t7M7D8N6sZ/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2023-11-19 05:08:21,889 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3e23aaf8-3947-48bf-ae73-c93202482a68/bin/utaipan-verify-t7M7D8N6sZ/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2023-11-19 05:08:21,917 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2023-11-19 05:08:21,918 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2023-11-19 05:08:21,918 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2023-11-19 05:08:21,918 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnHeap [2023-11-19 05:08:21,918 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2023-11-19 05:08:21,918 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2023-11-19 05:08:21,920 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2023-11-19 05:08:22,015 INFO L236 CfgBuilder]: Building ICFG [2023-11-19 05:08:22,018 INFO L262 CfgBuilder]: Building CFG for each procedure with an implementation [2023-11-19 05:08:22,323 INFO L277 CfgBuilder]: Performing block encoding [2023-11-19 05:08:22,396 INFO L297 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2023-11-19 05:08:22,397 INFO L302 CfgBuilder]: Removed 9 assume(true) statements. [2023-11-19 05:08:22,402 INFO L201 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 19.11 05:08:22 BoogieIcfgContainer [2023-11-19 05:08:22,402 INFO L131 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2023-11-19 05:08:22,405 INFO L112 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2023-11-19 05:08:22,405 INFO L270 PluginConnector]: Initializing TraceAbstraction... [2023-11-19 05:08:22,409 INFO L274 PluginConnector]: TraceAbstraction initialized [2023-11-19 05:08:22,409 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 19.11 05:08:21" (1/3) ... [2023-11-19 05:08:22,410 INFO L204 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@2747de15 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 19.11 05:08:22, skipping insertion in model container [2023-11-19 05:08:22,410 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 05:08:21" (2/3) ... [2023-11-19 05:08:22,411 INFO L204 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@2747de15 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 19.11 05:08:22, skipping insertion in model container [2023-11-19 05:08:22,411 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 19.11 05:08:22" (3/3) ... [2023-11-19 05:08:22,412 INFO L112 eAbstractionObserver]: Analyzing ICFG zero_sum_const_m4.c [2023-11-19 05:08:22,433 INFO L203 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2023-11-19 05:08:22,433 INFO L162 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2023-11-19 05:08:22,479 INFO L356 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2023-11-19 05:08:22,487 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;@6e5862bb, mLbeIndependenceSettings=[IndependenceType=SEMANTIC, AbstractionType=NONE, UseConditional=false, UseSemiCommutativity=true, Solver=Z3, SolverTimeout=1000ms] [2023-11-19 05:08:22,487 INFO L358 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2023-11-19 05:08:22,491 INFO L276 IsEmpty]: Start isEmpty. Operand has 17 states, 15 states have (on average 1.8) internal successors, (27), 16 states have internal predecessors, (27), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-19 05:08:22,496 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2023-11-19 05:08:22,497 INFO L187 NwaCegarLoop]: Found error trace [2023-11-19 05:08:22,497 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-19 05:08:22,498 INFO L420 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-19 05:08:22,503 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-19 05:08:22,503 INFO L85 PathProgramCache]: Analyzing trace with hash -2021895563, now seen corresponding path program 1 times [2023-11-19 05:08:22,510 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-19 05:08:22,511 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1726662764] [2023-11-19 05:08:22,511 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-19 05:08:22,511 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-19 05:08:22,617 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-19 05:08:22,771 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-19 05:08:22,771 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-19 05:08:22,772 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1726662764] [2023-11-19 05:08:22,773 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1726662764] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-19 05:08:22,773 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-11-19 05:08:22,773 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2023-11-19 05:08:22,775 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [418083825] [2023-11-19 05:08:22,776 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-19 05:08:22,780 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-11-19 05:08:22,780 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-19 05:08:22,809 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-11-19 05:08:22,810 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-11-19 05:08:22,812 INFO L87 Difference]: Start difference. First operand has 17 states, 15 states have (on average 1.8) internal successors, (27), 16 states have internal predecessors, (27), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Second operand has 3 states, 3 states have (on average 4.333333333333333) internal successors, (13), 3 states have internal predecessors, (13), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-19 05:08:22,928 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-19 05:08:22,928 INFO L93 Difference]: Finished difference Result 32 states and 51 transitions. [2023-11-19 05:08:22,929 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-11-19 05:08:22,931 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 4.333333333333333) internal successors, (13), 3 states have internal predecessors, (13), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 13 [2023-11-19 05:08:22,931 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-19 05:08:22,939 INFO L225 Difference]: With dead ends: 32 [2023-11-19 05:08:22,939 INFO L226 Difference]: Without dead ends: 15 [2023-11-19 05:08:22,943 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-11-19 05:08:22,949 INFO L413 NwaCegarLoop]: 6 mSDtfsCounter, 0 mSDsluCounter, 3 mSDsCounter, 0 mSdLazyCounter, 42 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 9 SdHoareTripleChecker+Invalid, 42 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 42 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-11-19 05:08:22,951 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [0 Valid, 9 Invalid, 42 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 42 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-11-19 05:08:22,970 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 15 states. [2023-11-19 05:08:22,983 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 15 to 15. [2023-11-19 05:08:22,985 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 15 states, 14 states have (on average 1.6428571428571428) internal successors, (23), 14 states have internal predecessors, (23), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-19 05:08:22,986 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 15 states to 15 states and 23 transitions. [2023-11-19 05:08:22,987 INFO L78 Accepts]: Start accepts. Automaton has 15 states and 23 transitions. Word has length 13 [2023-11-19 05:08:22,987 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-19 05:08:22,988 INFO L495 AbstractCegarLoop]: Abstraction has 15 states and 23 transitions. [2023-11-19 05:08:22,988 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 4.333333333333333) internal successors, (13), 3 states have internal predecessors, (13), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-19 05:08:22,988 INFO L276 IsEmpty]: Start isEmpty. Operand 15 states and 23 transitions. [2023-11-19 05:08:22,989 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2023-11-19 05:08:22,989 INFO L187 NwaCegarLoop]: Found error trace [2023-11-19 05:08:22,989 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-19 05:08:22,989 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2023-11-19 05:08:22,990 INFO L420 AbstractCegarLoop]: === Iteration 2 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-19 05:08:22,991 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-19 05:08:22,991 INFO L85 PathProgramCache]: Analyzing trace with hash 688320013, now seen corresponding path program 1 times [2023-11-19 05:08:22,991 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-19 05:08:22,991 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [539440656] [2023-11-19 05:08:22,992 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-19 05:08:22,992 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-19 05:08:23,012 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-19 05:08:23,120 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2023-11-19 05:08:23,121 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-19 05:08:23,121 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [539440656] [2023-11-19 05:08:23,122 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [539440656] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-19 05:08:23,122 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-11-19 05:08:23,123 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2023-11-19 05:08:23,123 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1515688485] [2023-11-19 05:08:23,123 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-19 05:08:23,127 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2023-11-19 05:08:23,128 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-19 05:08:23,129 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2023-11-19 05:08:23,130 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2023-11-19 05:08:23,131 INFO L87 Difference]: Start difference. First operand 15 states and 23 transitions. Second operand has 4 states, 4 states have (on average 3.5) internal successors, (14), 4 states have internal predecessors, (14), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-19 05:08:23,255 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-19 05:08:23,255 INFO L93 Difference]: Finished difference Result 33 states and 55 transitions. [2023-11-19 05:08:23,256 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2023-11-19 05:08:23,257 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 3.5) internal successors, (14), 4 states have internal predecessors, (14), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 14 [2023-11-19 05:08:23,257 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-19 05:08:23,258 INFO L225 Difference]: With dead ends: 33 [2023-11-19 05:08:23,258 INFO L226 Difference]: Without dead ends: 23 [2023-11-19 05:08:23,259 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2023-11-19 05:08:23,261 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 19 mSDsluCounter, 2 mSDsCounter, 0 mSdLazyCounter, 31 mSolverCounterSat, 15 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 19 SdHoareTripleChecker+Valid, 5 SdHoareTripleChecker+Invalid, 46 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 15 IncrementalHoareTripleChecker+Valid, 31 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-11-19 05:08:23,262 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [19 Valid, 5 Invalid, 46 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [15 Valid, 31 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-11-19 05:08:23,263 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 23 states. [2023-11-19 05:08:23,269 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 23 to 23. [2023-11-19 05:08:23,269 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 23 states, 22 states have (on average 1.4090909090909092) internal successors, (31), 22 states have internal predecessors, (31), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-19 05:08:23,270 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 23 states to 23 states and 31 transitions. [2023-11-19 05:08:23,271 INFO L78 Accepts]: Start accepts. Automaton has 23 states and 31 transitions. Word has length 14 [2023-11-19 05:08:23,271 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-19 05:08:23,272 INFO L495 AbstractCegarLoop]: Abstraction has 23 states and 31 transitions. [2023-11-19 05:08:23,272 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 3.5) internal successors, (14), 4 states have internal predecessors, (14), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-19 05:08:23,272 INFO L276 IsEmpty]: Start isEmpty. Operand 23 states and 31 transitions. [2023-11-19 05:08:23,273 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2023-11-19 05:08:23,273 INFO L187 NwaCegarLoop]: Found error trace [2023-11-19 05:08:23,274 INFO L195 NwaCegarLoop]: trace histogram [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 05:08:23,274 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2023-11-19 05:08:23,274 INFO L420 AbstractCegarLoop]: === Iteration 3 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-19 05:08:23,275 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-19 05:08:23,275 INFO L85 PathProgramCache]: Analyzing trace with hash 227618108, now seen corresponding path program 1 times [2023-11-19 05:08:23,276 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-19 05:08:23,276 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1967863184] [2023-11-19 05:08:23,276 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-19 05:08:23,277 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-19 05:08:23,318 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-19 05:08:23,434 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 8 trivial. 0 not checked. [2023-11-19 05:08:23,435 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-19 05:08:23,435 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1967863184] [2023-11-19 05:08:23,436 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1967863184] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-19 05:08:23,436 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1676943927] [2023-11-19 05:08:23,437 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-19 05:08:23,438 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-19 05:08:23,438 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3e23aaf8-3947-48bf-ae73-c93202482a68/bin/utaipan-verify-t7M7D8N6sZ/z3 [2023-11-19 05:08:23,443 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3e23aaf8-3947-48bf-ae73-c93202482a68/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-19 05:08:23,468 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3e23aaf8-3947-48bf-ae73-c93202482a68/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2023-11-19 05:08:23,554 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-19 05:08:23,557 INFO L262 TraceCheckSpWp]: Trace formula consists of 122 conjuncts, 4 conjunts are in the unsatisfiable core [2023-11-19 05:08:23,562 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-19 05:08:23,652 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 8 trivial. 0 not checked. [2023-11-19 05:08:23,652 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-19 05:08:23,703 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 8 trivial. 0 not checked. [2023-11-19 05:08:23,703 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1676943927] provided 0 perfect and 2 imperfect interpolant sequences [2023-11-19 05:08:23,710 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [437976230] [2023-11-19 05:08:23,732 INFO L159 IcfgInterpreter]: Started Sifa with 14 locations of interest [2023-11-19 05:08:23,732 INFO L166 IcfgInterpreter]: Building call graph [2023-11-19 05:08:23,736 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-11-19 05:08:23,743 INFO L176 IcfgInterpreter]: Starting interpretation [2023-11-19 05:08:23,743 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-11-19 05:08:24,625 INFO L180 IcfgInterpreter]: Interpretation finished [2023-11-19 05:08:24,801 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '334#(and (= |ULTIMATE.start_main_~a~0#1.offset| 0) (= ~MAX~0 100000) (<= ~SIZE~0 |ULTIMATE.start_main_~i~0#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (not (= |ULTIMATE.start_main_~sum~0#1| 0)) (<= 0 |ULTIMATE.start_main_~i~0#1|) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| 0))' at error location [2023-11-19 05:08:24,802 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-11-19 05:08:24,803 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-11-19 05:08:24,803 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 4, 4] total 7 [2023-11-19 05:08:24,810 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1037819153] [2023-11-19 05:08:24,811 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-11-19 05:08:24,812 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2023-11-19 05:08:24,813 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-19 05:08:24,814 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2023-11-19 05:08:24,816 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=34, Invalid=98, Unknown=0, NotChecked=0, Total=132 [2023-11-19 05:08:24,817 INFO L87 Difference]: Start difference. First operand 23 states and 31 transitions. Second operand has 7 states, 7 states have (on average 3.857142857142857) internal successors, (27), 7 states have internal predecessors, (27), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-19 05:08:24,935 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-19 05:08:24,935 INFO L93 Difference]: Finished difference Result 43 states and 59 transitions. [2023-11-19 05:08:24,935 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2023-11-19 05:08:24,936 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 7 states have (on average 3.857142857142857) internal successors, (27), 7 states have internal predecessors, (27), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 22 [2023-11-19 05:08:24,936 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-19 05:08:24,937 INFO L225 Difference]: With dead ends: 43 [2023-11-19 05:08:24,938 INFO L226 Difference]: Without dead ends: 24 [2023-11-19 05:08:24,939 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 68 GetRequests, 57 SyntacticMatches, 1 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 38 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=34, Invalid=98, Unknown=0, NotChecked=0, Total=132 [2023-11-19 05:08:24,943 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 0 mSDsluCounter, 8 mSDsCounter, 0 mSdLazyCounter, 95 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 11 SdHoareTripleChecker+Invalid, 95 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 95 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-11-19 05:08:24,947 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [0 Valid, 11 Invalid, 95 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 95 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-11-19 05:08:24,949 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 24 states. [2023-11-19 05:08:24,960 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 24 to 24. [2023-11-19 05:08:24,960 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 24 states, 23 states have (on average 1.391304347826087) internal successors, (32), 23 states have internal predecessors, (32), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-19 05:08:24,961 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 24 states to 24 states and 32 transitions. [2023-11-19 05:08:24,962 INFO L78 Accepts]: Start accepts. Automaton has 24 states and 32 transitions. Word has length 22 [2023-11-19 05:08:24,962 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-19 05:08:24,962 INFO L495 AbstractCegarLoop]: Abstraction has 24 states and 32 transitions. [2023-11-19 05:08:24,963 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 7 states have (on average 3.857142857142857) internal successors, (27), 7 states have internal predecessors, (27), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-19 05:08:24,963 INFO L276 IsEmpty]: Start isEmpty. Operand 24 states and 32 transitions. [2023-11-19 05:08:24,966 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 24 [2023-11-19 05:08:24,967 INFO L187 NwaCegarLoop]: Found error trace [2023-11-19 05:08:24,967 INFO L195 NwaCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-19 05:08:24,998 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3e23aaf8-3947-48bf-ae73-c93202482a68/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0 [2023-11-19 05:08:25,181 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2,2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3e23aaf8-3947-48bf-ae73-c93202482a68/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-19 05:08:25,182 INFO L420 AbstractCegarLoop]: === Iteration 4 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-19 05:08:25,183 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-19 05:08:25,183 INFO L85 PathProgramCache]: Analyzing trace with hash 174070948, now seen corresponding path program 2 times [2023-11-19 05:08:25,183 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-19 05:08:25,183 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1104192124] [2023-11-19 05:08:25,183 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-19 05:08:25,184 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-19 05:08:25,240 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-19 05:08:25,412 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2023-11-19 05:08:25,412 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-19 05:08:25,413 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1104192124] [2023-11-19 05:08:25,413 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1104192124] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-19 05:08:25,413 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1611293151] [2023-11-19 05:08:25,413 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2023-11-19 05:08:25,413 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-19 05:08:25,414 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3e23aaf8-3947-48bf-ae73-c93202482a68/bin/utaipan-verify-t7M7D8N6sZ/z3 [2023-11-19 05:08:25,415 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3e23aaf8-3947-48bf-ae73-c93202482a68/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-19 05:08:25,440 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3e23aaf8-3947-48bf-ae73-c93202482a68/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2023-11-19 05:08:25,491 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 2 check-sat command(s) [2023-11-19 05:08:25,491 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-11-19 05:08:25,492 INFO L262 TraceCheckSpWp]: Trace formula consists of 129 conjuncts, 4 conjunts are in the unsatisfiable core [2023-11-19 05:08:25,494 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-19 05:08:25,542 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2023-11-19 05:08:25,542 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-19 05:08:25,582 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2023-11-19 05:08:25,582 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1611293151] provided 0 perfect and 2 imperfect interpolant sequences [2023-11-19 05:08:25,583 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1094971590] [2023-11-19 05:08:25,596 INFO L159 IcfgInterpreter]: Started Sifa with 14 locations of interest [2023-11-19 05:08:25,596 INFO L166 IcfgInterpreter]: Building call graph [2023-11-19 05:08:25,597 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-11-19 05:08:25,597 INFO L176 IcfgInterpreter]: Starting interpretation [2023-11-19 05:08:25,597 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-11-19 05:08:26,039 INFO L180 IcfgInterpreter]: Interpretation finished [2023-11-19 05:08:26,195 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '600#(and (<= ~SIZE~0 |ULTIMATE.start_main_~i~0#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (not (= |ULTIMATE.start_main_~sum~0#1| 0)) (<= 0 |ULTIMATE.start_main_~i~0#1|) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| 0))' at error location [2023-11-19 05:08:26,195 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-11-19 05:08:26,196 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-11-19 05:08:26,196 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 5, 5] total 8 [2023-11-19 05:08:26,196 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1299690284] [2023-11-19 05:08:26,196 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-11-19 05:08:26,197 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2023-11-19 05:08:26,197 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-19 05:08:26,198 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2023-11-19 05:08:26,198 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=41, Invalid=115, Unknown=0, NotChecked=0, Total=156 [2023-11-19 05:08:26,199 INFO L87 Difference]: Start difference. First operand 24 states and 32 transitions. Second operand has 8 states, 8 states have (on average 5.0) internal successors, (40), 8 states have internal predecessors, (40), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-19 05:08:26,290 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-19 05:08:26,290 INFO L93 Difference]: Finished difference Result 49 states and 71 transitions. [2023-11-19 05:08:26,290 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2023-11-19 05:08:26,290 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 8 states have (on average 5.0) internal successors, (40), 8 states have internal predecessors, (40), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 23 [2023-11-19 05:08:26,291 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-19 05:08:26,291 INFO L225 Difference]: With dead ends: 49 [2023-11-19 05:08:26,291 INFO L226 Difference]: Without dead ends: 32 [2023-11-19 05:08:26,292 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 72 GetRequests, 58 SyntacticMatches, 3 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 53 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=41, Invalid=115, Unknown=0, NotChecked=0, Total=156 [2023-11-19 05:08:26,293 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 8 mSDsluCounter, 6 mSDsCounter, 0 mSdLazyCounter, 53 mSolverCounterSat, 36 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 8 SdHoareTripleChecker+Valid, 9 SdHoareTripleChecker+Invalid, 89 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 36 IncrementalHoareTripleChecker+Valid, 53 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-11-19 05:08:26,294 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [8 Valid, 9 Invalid, 89 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [36 Valid, 53 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-11-19 05:08:26,295 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 32 states. [2023-11-19 05:08:26,300 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 32 to 32. [2023-11-19 05:08:26,300 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 32 states, 31 states have (on average 1.2903225806451613) internal successors, (40), 31 states have internal predecessors, (40), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-19 05:08:26,301 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 32 states to 32 states and 40 transitions. [2023-11-19 05:08:26,301 INFO L78 Accepts]: Start accepts. Automaton has 32 states and 40 transitions. Word has length 23 [2023-11-19 05:08:26,302 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-19 05:08:26,302 INFO L495 AbstractCegarLoop]: Abstraction has 32 states and 40 transitions. [2023-11-19 05:08:26,302 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 8 states, 8 states have (on average 5.0) internal successors, (40), 8 states have internal predecessors, (40), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-19 05:08:26,302 INFO L276 IsEmpty]: Start isEmpty. Operand 32 states and 40 transitions. [2023-11-19 05:08:26,303 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 32 [2023-11-19 05:08:26,303 INFO L187 NwaCegarLoop]: Found error trace [2023-11-19 05:08:26,303 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-19 05:08:26,335 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3e23aaf8-3947-48bf-ae73-c93202482a68/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Forceful destruction successful, exit code 0 [2023-11-19 05:08:26,513 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3,3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3e23aaf8-3947-48bf-ae73-c93202482a68/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-19 05:08:26,514 INFO L420 AbstractCegarLoop]: === Iteration 5 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-19 05:08:26,514 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-19 05:08:26,515 INFO L85 PathProgramCache]: Analyzing trace with hash -406561771, now seen corresponding path program 3 times [2023-11-19 05:08:26,515 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-19 05:08:26,515 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2124883054] [2023-11-19 05:08:26,515 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-19 05:08:26,515 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-19 05:08:26,654 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-19 05:08:30,072 INFO L134 CoverageAnalysis]: Checked inductivity of 27 backedges. 0 proven. 27 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-19 05:08:30,072 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-19 05:08:30,072 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2124883054] [2023-11-19 05:08:30,073 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2124883054] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-19 05:08:30,073 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1927348193] [2023-11-19 05:08:30,073 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2023-11-19 05:08:30,073 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-19 05:08:30,073 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3e23aaf8-3947-48bf-ae73-c93202482a68/bin/utaipan-verify-t7M7D8N6sZ/z3 [2023-11-19 05:08:30,074 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3e23aaf8-3947-48bf-ae73-c93202482a68/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-19 05:08:30,105 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3e23aaf8-3947-48bf-ae73-c93202482a68/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2023-11-19 05:08:30,184 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2023-11-19 05:08:30,185 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-11-19 05:08:30,190 INFO L262 TraceCheckSpWp]: Trace formula consists of 169 conjuncts, 71 conjunts are in the unsatisfiable core [2023-11-19 05:08:30,198 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-19 05:08:31,308 INFO L134 CoverageAnalysis]: Checked inductivity of 27 backedges. 0 proven. 24 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2023-11-19 05:08:31,309 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-19 05:08:33,280 INFO L349 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2023-11-19 05:08:33,281 INFO L378 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 35 treesize of output 43 [2023-11-19 05:08:33,403 INFO L134 CoverageAnalysis]: Checked inductivity of 27 backedges. 0 proven. 24 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2023-11-19 05:08:33,403 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1927348193] provided 0 perfect and 2 imperfect interpolant sequences [2023-11-19 05:08:33,405 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1845326141] [2023-11-19 05:08:33,410 INFO L159 IcfgInterpreter]: Started Sifa with 14 locations of interest [2023-11-19 05:08:33,411 INFO L166 IcfgInterpreter]: Building call graph [2023-11-19 05:08:33,411 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-11-19 05:08:33,411 INFO L176 IcfgInterpreter]: Starting interpretation [2023-11-19 05:08:33,412 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-11-19 05:08:33,903 INFO L180 IcfgInterpreter]: Interpretation finished [2023-11-19 05:08:34,494 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '996#(and (<= ~SIZE~0 |ULTIMATE.start_main_~i~0#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (not (= |ULTIMATE.start_main_~sum~0#1| 0)) (<= 0 |ULTIMATE.start_main_~i~0#1|) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| 0))' at error location [2023-11-19 05:08:34,494 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-11-19 05:08:34,495 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-11-19 05:08:34,495 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [24, 22, 24] total 62 [2023-11-19 05:08:34,495 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [969667223] [2023-11-19 05:08:34,495 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-11-19 05:08:34,496 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 62 states [2023-11-19 05:08:34,496 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-19 05:08:34,498 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 62 interpolants. [2023-11-19 05:08:34,500 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=238, Invalid=4184, Unknown=0, NotChecked=0, Total=4422 [2023-11-19 05:08:34,500 INFO L87 Difference]: Start difference. First operand 32 states and 40 transitions. Second operand has 62 states, 62 states have (on average 1.3709677419354838) internal successors, (85), 62 states have internal predecessors, (85), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-19 05:08:36,059 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-19 05:08:36,060 INFO L93 Difference]: Finished difference Result 57 states and 72 transitions. [2023-11-19 05:08:36,060 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2023-11-19 05:08:36,061 INFO L78 Accepts]: Start accepts. Automaton has has 62 states, 62 states have (on average 1.3709677419354838) internal successors, (85), 62 states have internal predecessors, (85), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 31 [2023-11-19 05:08:36,061 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-19 05:08:36,062 INFO L225 Difference]: With dead ends: 57 [2023-11-19 05:08:36,062 INFO L226 Difference]: Without dead ends: 54 [2023-11-19 05:08:36,065 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 130 GetRequests, 55 SyntacticMatches, 1 SemanticMatches, 74 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1292 ImplicationChecksByTransitivity, 4.4s TimeCoverageRelationStatistics Valid=293, Invalid=5407, Unknown=0, NotChecked=0, Total=5700 [2023-11-19 05:08:36,066 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 3 mSDsluCounter, 64 mSDsCounter, 0 mSdLazyCounter, 1241 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.8s Time, 0 mProtectedPredicate, 0 mProtectedAction, 3 SdHoareTripleChecker+Valid, 67 SdHoareTripleChecker+Invalid, 1244 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 1241 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.9s IncrementalHoareTripleChecker+Time [2023-11-19 05:08:36,067 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [3 Valid, 67 Invalid, 1244 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 1241 Invalid, 0 Unknown, 0 Unchecked, 0.9s Time] [2023-11-19 05:08:36,067 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 54 states. [2023-11-19 05:08:36,079 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 54 to 52. [2023-11-19 05:08:36,080 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 52 states, 51 states have (on average 1.3137254901960784) internal successors, (67), 51 states have internal predecessors, (67), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-19 05:08:36,081 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 52 states to 52 states and 67 transitions. [2023-11-19 05:08:36,081 INFO L78 Accepts]: Start accepts. Automaton has 52 states and 67 transitions. Word has length 31 [2023-11-19 05:08:36,082 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-19 05:08:36,082 INFO L495 AbstractCegarLoop]: Abstraction has 52 states and 67 transitions. [2023-11-19 05:08:36,082 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 62 states, 62 states have (on average 1.3709677419354838) internal successors, (85), 62 states have internal predecessors, (85), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-19 05:08:36,082 INFO L276 IsEmpty]: Start isEmpty. Operand 52 states and 67 transitions. [2023-11-19 05:08:36,084 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 33 [2023-11-19 05:08:36,084 INFO L187 NwaCegarLoop]: Found error trace [2023-11-19 05:08:36,084 INFO L195 NwaCegarLoop]: trace histogram [3, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-19 05:08:36,113 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3e23aaf8-3947-48bf-ae73-c93202482a68/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Forceful destruction successful, exit code 0 [2023-11-19 05:08:36,300 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3e23aaf8-3947-48bf-ae73-c93202482a68/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-19 05:08:36,300 INFO L420 AbstractCegarLoop]: === Iteration 6 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-19 05:08:36,301 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-19 05:08:36,301 INFO L85 PathProgramCache]: Analyzing trace with hash -1060138885, now seen corresponding path program 4 times [2023-11-19 05:08:36,301 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-19 05:08:36,301 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [80596242] [2023-11-19 05:08:36,301 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-19 05:08:36,301 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-19 05:08:36,327 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-19 05:08:36,444 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 4 proven. 5 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2023-11-19 05:08:36,444 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-19 05:08:36,445 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [80596242] [2023-11-19 05:08:36,445 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [80596242] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-19 05:08:36,445 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2024530271] [2023-11-19 05:08:36,445 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2023-11-19 05:08:36,445 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-19 05:08:36,446 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3e23aaf8-3947-48bf-ae73-c93202482a68/bin/utaipan-verify-t7M7D8N6sZ/z3 [2023-11-19 05:08:36,447 INFO L229 MonitoredProcess]: Starting monitored process 5 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3e23aaf8-3947-48bf-ae73-c93202482a68/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-19 05:08:36,450 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3e23aaf8-3947-48bf-ae73-c93202482a68/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2023-11-19 05:08:36,523 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-19 05:08:36,524 INFO L262 TraceCheckSpWp]: Trace formula consists of 174 conjuncts, 8 conjunts are in the unsatisfiable core [2023-11-19 05:08:36,527 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-19 05:08:36,586 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 6 proven. 3 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2023-11-19 05:08:36,586 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-19 05:08:36,641 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 6 proven. 3 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2023-11-19 05:08:36,642 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2024530271] provided 0 perfect and 2 imperfect interpolant sequences [2023-11-19 05:08:36,642 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [903556329] [2023-11-19 05:08:36,646 INFO L159 IcfgInterpreter]: Started Sifa with 14 locations of interest [2023-11-19 05:08:36,647 INFO L166 IcfgInterpreter]: Building call graph [2023-11-19 05:08:36,647 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-11-19 05:08:36,647 INFO L176 IcfgInterpreter]: Starting interpretation [2023-11-19 05:08:36,647 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-11-19 05:08:37,069 INFO L180 IcfgInterpreter]: Interpretation finished [2023-11-19 05:08:37,271 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '1424#(and (<= ~SIZE~0 |ULTIMATE.start_main_~i~0#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (not (= |ULTIMATE.start_main_~sum~0#1| 0)) (<= 0 |ULTIMATE.start_main_~i~0#1|) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| 0))' at error location [2023-11-19 05:08:37,271 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-11-19 05:08:37,271 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-11-19 05:08:37,271 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 9, 9] total 14 [2023-11-19 05:08:37,271 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1965730303] [2023-11-19 05:08:37,272 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-11-19 05:08:37,272 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 14 states [2023-11-19 05:08:37,272 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-19 05:08:37,273 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2023-11-19 05:08:37,274 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=78, Invalid=264, Unknown=0, NotChecked=0, Total=342 [2023-11-19 05:08:37,274 INFO L87 Difference]: Start difference. First operand 52 states and 67 transitions. Second operand has 14 states, 14 states have (on average 2.357142857142857) internal successors, (33), 14 states have internal predecessors, (33), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-19 05:08:37,646 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-19 05:08:37,647 INFO L93 Difference]: Finished difference Result 114 states and 149 transitions. [2023-11-19 05:08:37,647 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2023-11-19 05:08:37,647 INFO L78 Accepts]: Start accepts. Automaton has has 14 states, 14 states have (on average 2.357142857142857) internal successors, (33), 14 states have internal predecessors, (33), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 32 [2023-11-19 05:08:37,648 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-19 05:08:37,648 INFO L225 Difference]: With dead ends: 114 [2023-11-19 05:08:37,649 INFO L226 Difference]: Without dead ends: 65 [2023-11-19 05:08:37,649 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 106 GetRequests, 81 SyntacticMatches, 5 SemanticMatches, 20 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 158 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=107, Invalid=355, Unknown=0, NotChecked=0, Total=462 [2023-11-19 05:08:37,650 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 40 mSDsluCounter, 14 mSDsCounter, 0 mSdLazyCounter, 174 mSolverCounterSat, 147 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 40 SdHoareTripleChecker+Valid, 17 SdHoareTripleChecker+Invalid, 321 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 147 IncrementalHoareTripleChecker+Valid, 174 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2023-11-19 05:08:37,651 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [40 Valid, 17 Invalid, 321 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [147 Valid, 174 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2023-11-19 05:08:37,652 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 65 states. [2023-11-19 05:08:37,664 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 65 to 58. [2023-11-19 05:08:37,665 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 58 states, 57 states have (on average 1.263157894736842) internal successors, (72), 57 states have internal predecessors, (72), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-19 05:08:37,666 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 58 states to 58 states and 72 transitions. [2023-11-19 05:08:37,666 INFO L78 Accepts]: Start accepts. Automaton has 58 states and 72 transitions. Word has length 32 [2023-11-19 05:08:37,667 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-19 05:08:37,667 INFO L495 AbstractCegarLoop]: Abstraction has 58 states and 72 transitions. [2023-11-19 05:08:37,667 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 14 states, 14 states have (on average 2.357142857142857) internal successors, (33), 14 states have internal predecessors, (33), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-19 05:08:37,667 INFO L276 IsEmpty]: Start isEmpty. Operand 58 states and 72 transitions. [2023-11-19 05:08:37,672 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 34 [2023-11-19 05:08:37,672 INFO L187 NwaCegarLoop]: Found error trace [2023-11-19 05:08:37,673 INFO L195 NwaCegarLoop]: trace histogram [3, 3, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-19 05:08:37,701 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3e23aaf8-3947-48bf-ae73-c93202482a68/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Ended with exit code 0 [2023-11-19 05:08:37,897 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3e23aaf8-3947-48bf-ae73-c93202482a68/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable5 [2023-11-19 05:08:37,898 INFO L420 AbstractCegarLoop]: === Iteration 7 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-19 05:08:37,898 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-19 05:08:37,898 INFO L85 PathProgramCache]: Analyzing trace with hash 1391421492, now seen corresponding path program 5 times [2023-11-19 05:08:37,898 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-19 05:08:37,898 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2121955344] [2023-11-19 05:08:37,899 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-19 05:08:37,899 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-19 05:08:37,929 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-19 05:08:38,076 INFO L134 CoverageAnalysis]: Checked inductivity of 33 backedges. 1 proven. 8 refuted. 0 times theorem prover too weak. 24 trivial. 0 not checked. [2023-11-19 05:08:38,077 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-19 05:08:38,080 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2121955344] [2023-11-19 05:08:38,080 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2121955344] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-19 05:08:38,080 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1685814493] [2023-11-19 05:08:38,080 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2023-11-19 05:08:38,081 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-19 05:08:38,081 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3e23aaf8-3947-48bf-ae73-c93202482a68/bin/utaipan-verify-t7M7D8N6sZ/z3 [2023-11-19 05:08:38,084 INFO L229 MonitoredProcess]: Starting monitored process 6 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3e23aaf8-3947-48bf-ae73-c93202482a68/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-19 05:08:38,105 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3e23aaf8-3947-48bf-ae73-c93202482a68/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2023-11-19 05:08:38,190 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2023-11-19 05:08:38,190 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-11-19 05:08:38,192 INFO L262 TraceCheckSpWp]: Trace formula consists of 181 conjuncts, 8 conjunts are in the unsatisfiable core [2023-11-19 05:08:38,194 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-19 05:08:38,308 INFO L134 CoverageAnalysis]: Checked inductivity of 33 backedges. 3 proven. 6 refuted. 0 times theorem prover too weak. 24 trivial. 0 not checked. [2023-11-19 05:08:38,308 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-19 05:08:38,407 INFO L134 CoverageAnalysis]: Checked inductivity of 33 backedges. 3 proven. 6 refuted. 0 times theorem prover too weak. 24 trivial. 0 not checked. [2023-11-19 05:08:38,407 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1685814493] provided 0 perfect and 2 imperfect interpolant sequences [2023-11-19 05:08:38,408 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [189262437] [2023-11-19 05:08:38,414 INFO L159 IcfgInterpreter]: Started Sifa with 14 locations of interest [2023-11-19 05:08:38,414 INFO L166 IcfgInterpreter]: Building call graph [2023-11-19 05:08:38,415 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-11-19 05:08:38,415 INFO L176 IcfgInterpreter]: Starting interpretation [2023-11-19 05:08:38,415 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-11-19 05:08:38,832 INFO L180 IcfgInterpreter]: Interpretation finished [2023-11-19 05:08:39,002 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '1966#(and (<= ~SIZE~0 |ULTIMATE.start_main_~i~0#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (not (= |ULTIMATE.start_main_~sum~0#1| 0)) (<= 0 |ULTIMATE.start_main_~i~0#1|) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| 0))' at error location [2023-11-19 05:08:39,002 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-11-19 05:08:39,002 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-11-19 05:08:39,002 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 9, 9] total 14 [2023-11-19 05:08:39,003 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1797417837] [2023-11-19 05:08:39,003 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-11-19 05:08:39,003 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 14 states [2023-11-19 05:08:39,003 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-19 05:08:39,004 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2023-11-19 05:08:39,004 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=65, Invalid=241, Unknown=0, NotChecked=0, Total=306 [2023-11-19 05:08:39,004 INFO L87 Difference]: Start difference. First operand 58 states and 72 transitions. Second operand has 14 states, 14 states have (on average 2.357142857142857) internal successors, (33), 14 states have internal predecessors, (33), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-19 05:08:39,318 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-19 05:08:39,318 INFO L93 Difference]: Finished difference Result 62 states and 76 transitions. [2023-11-19 05:08:39,318 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2023-11-19 05:08:39,319 INFO L78 Accepts]: Start accepts. Automaton has has 14 states, 14 states have (on average 2.357142857142857) internal successors, (33), 14 states have internal predecessors, (33), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 33 [2023-11-19 05:08:39,319 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-19 05:08:39,319 INFO L225 Difference]: With dead ends: 62 [2023-11-19 05:08:39,320 INFO L226 Difference]: Without dead ends: 41 [2023-11-19 05:08:39,320 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 111 GetRequests, 84 SyntacticMatches, 6 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 157 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=103, Invalid=403, Unknown=0, NotChecked=0, Total=506 [2023-11-19 05:08:39,321 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 23 mSDsluCounter, 10 mSDsCounter, 0 mSdLazyCounter, 197 mSolverCounterSat, 99 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 23 SdHoareTripleChecker+Valid, 13 SdHoareTripleChecker+Invalid, 296 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 99 IncrementalHoareTripleChecker+Valid, 197 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2023-11-19 05:08:39,322 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [23 Valid, 13 Invalid, 296 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [99 Valid, 197 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2023-11-19 05:08:39,323 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 41 states. [2023-11-19 05:08:39,329 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 41 to 41. [2023-11-19 05:08:39,330 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 41 states, 40 states have (on average 1.225) internal successors, (49), 40 states have internal predecessors, (49), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-19 05:08:39,331 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 41 states to 41 states and 49 transitions. [2023-11-19 05:08:39,331 INFO L78 Accepts]: Start accepts. Automaton has 41 states and 49 transitions. Word has length 33 [2023-11-19 05:08:39,331 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-19 05:08:39,331 INFO L495 AbstractCegarLoop]: Abstraction has 41 states and 49 transitions. [2023-11-19 05:08:39,332 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 14 states, 14 states have (on average 2.357142857142857) internal successors, (33), 14 states have internal predecessors, (33), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-19 05:08:39,332 INFO L276 IsEmpty]: Start isEmpty. Operand 41 states and 49 transitions. [2023-11-19 05:08:39,333 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 41 [2023-11-19 05:08:39,333 INFO L187 NwaCegarLoop]: Found error trace [2023-11-19 05:08:39,333 INFO L195 NwaCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-19 05:08:39,357 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3e23aaf8-3947-48bf-ae73-c93202482a68/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Forceful destruction successful, exit code 0 [2023-11-19 05:08:39,545 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6,6 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3e23aaf8-3947-48bf-ae73-c93202482a68/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-19 05:08:39,546 INFO L420 AbstractCegarLoop]: === Iteration 8 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-19 05:08:39,546 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-19 05:08:39,546 INFO L85 PathProgramCache]: Analyzing trace with hash 214001820, now seen corresponding path program 6 times [2023-11-19 05:08:39,546 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-19 05:08:39,547 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1138818538] [2023-11-19 05:08:39,547 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-19 05:08:39,547 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-19 05:08:39,659 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-19 05:08:47,018 INFO L134 CoverageAnalysis]: Checked inductivity of 54 backedges. 0 proven. 54 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-19 05:08:47,018 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-19 05:08:47,019 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1138818538] [2023-11-19 05:08:47,019 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1138818538] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-19 05:08:47,019 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1819960712] [2023-11-19 05:08:47,019 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2023-11-19 05:08:47,019 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-19 05:08:47,019 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3e23aaf8-3947-48bf-ae73-c93202482a68/bin/utaipan-verify-t7M7D8N6sZ/z3 [2023-11-19 05:08:47,020 INFO L229 MonitoredProcess]: Starting monitored process 7 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3e23aaf8-3947-48bf-ae73-c93202482a68/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-19 05:08:47,021 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3e23aaf8-3947-48bf-ae73-c93202482a68/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Waiting until timeout for monitored process [2023-11-19 05:08:47,115 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2023-11-19 05:08:47,116 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-11-19 05:08:47,119 INFO L262 TraceCheckSpWp]: Trace formula consists of 216 conjuncts, 103 conjunts are in the unsatisfiable core [2023-11-19 05:08:47,124 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-19 05:08:49,756 INFO L134 CoverageAnalysis]: Checked inductivity of 54 backedges. 0 proven. 48 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2023-11-19 05:08:49,756 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-19 05:08:53,509 INFO L349 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2023-11-19 05:08:53,509 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 6 select indices, 6 select index equivalence classes, 0 disjoint index pairs (out of 15 index pairs), introduced 6 new quantified variables, introduced 15 case distinctions, treesize of input 52 treesize of output 89 [2023-11-19 05:08:53,828 INFO L134 CoverageAnalysis]: Checked inductivity of 54 backedges. 0 proven. 48 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2023-11-19 05:08:53,829 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1819960712] provided 0 perfect and 2 imperfect interpolant sequences [2023-11-19 05:08:53,829 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [2098954312] [2023-11-19 05:08:53,831 INFO L159 IcfgInterpreter]: Started Sifa with 14 locations of interest [2023-11-19 05:08:53,831 INFO L166 IcfgInterpreter]: Building call graph [2023-11-19 05:08:53,832 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-11-19 05:08:53,832 INFO L176 IcfgInterpreter]: Starting interpretation [2023-11-19 05:08:53,832 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-11-19 05:08:54,134 INFO L180 IcfgInterpreter]: Interpretation finished [2023-11-19 05:08:54,943 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '2500#(and (= |ULTIMATE.start_main_~a~0#1.offset| 0) (= ~MAX~0 100000) (<= ~SIZE~0 |ULTIMATE.start_main_~i~0#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (not (= |ULTIMATE.start_main_~sum~0#1| 0)) (<= 0 |ULTIMATE.start_main_~i~0#1|) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| 0))' at error location [2023-11-19 05:08:54,943 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-11-19 05:08:54,943 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-11-19 05:08:54,943 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [39, 30, 32] total 93 [2023-11-19 05:08:54,944 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1293029355] [2023-11-19 05:08:54,944 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-11-19 05:08:54,944 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 93 states [2023-11-19 05:08:54,945 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-19 05:08:54,946 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 93 interpolants. [2023-11-19 05:08:54,950 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=317, Invalid=9189, Unknown=0, NotChecked=0, Total=9506 [2023-11-19 05:08:54,951 INFO L87 Difference]: Start difference. First operand 41 states and 49 transitions. Second operand has 93 states, 93 states have (on average 1.1827956989247312) internal successors, (110), 93 states have internal predecessors, (110), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0)