./Ultimate.py --spec ../../sv-benchmarks/c/properties/unreach-call.prp --file ../../sv-benchmarks/c/list-ext3-properties/sll_nondet_insert-2.i --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for ERROR reachability Using default analysis Version e04fb08f Calling Ultimate with: /usr/lib/jvm/java-1.11.0-openjdk-amd64/bin/java -Dosgi.configuration.area=/tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_222461bd-0a09-486d-b4d3-064f768200ab/bin/utaipan-Xvt2sAort0/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_222461bd-0a09-486d-b4d3-064f768200ab/bin/utaipan-Xvt2sAort0/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_222461bd-0a09-486d-b4d3-064f768200ab/bin/utaipan-Xvt2sAort0/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_222461bd-0a09-486d-b4d3-064f768200ab/bin/utaipan-Xvt2sAort0/config/TaipanReach.xml -i ../../sv-benchmarks/c/list-ext3-properties/sll_nondet_insert-2.i -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_222461bd-0a09-486d-b4d3-064f768200ab/bin/utaipan-Xvt2sAort0/config/svcomp-Reach-32bit-Taipan_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_222461bd-0a09-486d-b4d3-064f768200ab/bin/utaipan-Xvt2sAort0 --witnessprinter.witness.filename witness.graphml --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 5bf92ba2f935aadbe2c0ae3d366f72b4144ff6b8b5ce7c503e628d249b478be5 --- Real Ultimate output --- [0.001s][warning][os,container] Duplicate cpuset controllers detected. Picking /sys/fs/cgroup/cpuset, skipping /sys/fs/cgroup/cpuset. This is Ultimate 0.2.2-dev-e04fb08 [2022-11-16 20:11:21,089 INFO L177 SettingsManager]: Resetting all preferences to default values... [2022-11-16 20:11:21,091 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2022-11-16 20:11:21,111 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2022-11-16 20:11:21,111 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2022-11-16 20:11:21,113 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2022-11-16 20:11:21,114 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2022-11-16 20:11:21,116 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2022-11-16 20:11:21,117 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2022-11-16 20:11:21,118 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2022-11-16 20:11:21,119 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2022-11-16 20:11:21,121 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2022-11-16 20:11:21,121 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2022-11-16 20:11:21,122 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2022-11-16 20:11:21,123 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2022-11-16 20:11:21,125 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2022-11-16 20:11:21,126 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2022-11-16 20:11:21,127 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2022-11-16 20:11:21,128 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2022-11-16 20:11:21,130 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2022-11-16 20:11:21,132 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2022-11-16 20:11:21,133 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2022-11-16 20:11:21,134 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2022-11-16 20:11:21,135 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2022-11-16 20:11:21,139 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2022-11-16 20:11:21,140 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2022-11-16 20:11:21,140 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2022-11-16 20:11:21,141 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2022-11-16 20:11:21,142 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2022-11-16 20:11:21,143 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2022-11-16 20:11:21,144 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2022-11-16 20:11:21,145 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2022-11-16 20:11:21,146 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2022-11-16 20:11:21,147 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2022-11-16 20:11:21,148 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2022-11-16 20:11:21,148 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2022-11-16 20:11:21,149 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2022-11-16 20:11:21,150 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2022-11-16 20:11:21,150 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2022-11-16 20:11:21,151 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2022-11-16 20:11:21,155 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2022-11-16 20:11:21,156 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_222461bd-0a09-486d-b4d3-064f768200ab/bin/utaipan-Xvt2sAort0/config/svcomp-Reach-32bit-Taipan_Default.epf [2022-11-16 20:11:21,198 INFO L113 SettingsManager]: Loading preferences was successful [2022-11-16 20:11:21,198 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2022-11-16 20:11:21,198 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2022-11-16 20:11:21,199 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2022-11-16 20:11:21,199 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2022-11-16 20:11:21,200 INFO L138 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2022-11-16 20:11:21,200 INFO L138 SettingsManager]: * User list type=DISABLED [2022-11-16 20:11:21,200 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2022-11-16 20:11:21,201 INFO L138 SettingsManager]: * Explicit value domain=true [2022-11-16 20:11:21,201 INFO L138 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2022-11-16 20:11:21,216 INFO L138 SettingsManager]: * Octagon Domain=false [2022-11-16 20:11:21,216 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2022-11-16 20:11:21,217 INFO L138 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2022-11-16 20:11:21,217 INFO L138 SettingsManager]: * Use the RCFG-of-the-future interface=true [2022-11-16 20:11:21,217 INFO L138 SettingsManager]: * Interval Domain=false [2022-11-16 20:11:21,218 INFO L136 SettingsManager]: Preferences of Sifa differ from their defaults: [2022-11-16 20:11:21,218 INFO L138 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2022-11-16 20:11:21,218 INFO L138 SettingsManager]: * Simplification Technique=POLY_PAC [2022-11-16 20:11:21,219 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2022-11-16 20:11:21,219 INFO L138 SettingsManager]: * sizeof long=4 [2022-11-16 20:11:21,220 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2022-11-16 20:11:21,220 INFO L138 SettingsManager]: * sizeof POINTER=4 [2022-11-16 20:11:21,220 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2022-11-16 20:11:21,221 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2022-11-16 20:11:21,221 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2022-11-16 20:11:21,222 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2022-11-16 20:11:21,222 INFO L138 SettingsManager]: * sizeof long double=12 [2022-11-16 20:11:21,224 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2022-11-16 20:11:21,224 INFO L138 SettingsManager]: * Use constant arrays=true [2022-11-16 20:11:21,224 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2022-11-16 20:11:21,225 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2022-11-16 20:11:21,225 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2022-11-16 20:11:21,225 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2022-11-16 20:11:21,226 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2022-11-16 20:11:21,226 INFO L138 SettingsManager]: * Abstract interpretation Mode=USE_PREDICATES [2022-11-16 20:11:21,226 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2022-11-16 20:11:21,227 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2022-11-16 20:11:21,227 INFO L138 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2022-11-16 20:11:21,227 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2022-11-16 20:11:21,228 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2022-11-16 20:11:21,228 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2022-11-16 20:11:21,228 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode 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_222461bd-0a09-486d-b4d3-064f768200ab/bin/utaipan-Xvt2sAort0/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_222461bd-0a09-486d-b4d3-064f768200ab/bin/utaipan-Xvt2sAort0 Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> 5bf92ba2f935aadbe2c0ae3d366f72b4144ff6b8b5ce7c503e628d249b478be5 [2022-11-16 20:11:21,515 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2022-11-16 20:11:21,553 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2022-11-16 20:11:21,556 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2022-11-16 20:11:21,557 INFO L271 PluginConnector]: Initializing CDTParser... [2022-11-16 20:11:21,558 INFO L275 PluginConnector]: CDTParser initialized [2022-11-16 20:11:21,559 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_222461bd-0a09-486d-b4d3-064f768200ab/bin/utaipan-Xvt2sAort0/../../sv-benchmarks/c/list-ext3-properties/sll_nondet_insert-2.i [2022-11-16 20:11:21,627 INFO L220 CDTParser]: Created temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_222461bd-0a09-486d-b4d3-064f768200ab/bin/utaipan-Xvt2sAort0/data/af028907e/d619762e758d4a8cb50dfbd0af913640/FLAG3488ea9cb [2022-11-16 20:11:22,140 INFO L306 CDTParser]: Found 1 translation units. [2022-11-16 20:11:22,141 INFO L160 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_222461bd-0a09-486d-b4d3-064f768200ab/sv-benchmarks/c/list-ext3-properties/sll_nondet_insert-2.i [2022-11-16 20:11:22,156 INFO L349 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_222461bd-0a09-486d-b4d3-064f768200ab/bin/utaipan-Xvt2sAort0/data/af028907e/d619762e758d4a8cb50dfbd0af913640/FLAG3488ea9cb [2022-11-16 20:11:22,636 INFO L357 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_222461bd-0a09-486d-b4d3-064f768200ab/bin/utaipan-Xvt2sAort0/data/af028907e/d619762e758d4a8cb50dfbd0af913640 [2022-11-16 20:11:22,639 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2022-11-16 20:11:22,640 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2022-11-16 20:11:22,642 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2022-11-16 20:11:22,642 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2022-11-16 20:11:22,650 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2022-11-16 20:11:22,651 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 16.11 08:11:22" (1/1) ... [2022-11-16 20:11:22,652 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@f1b98ba and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 16.11 08:11:22, skipping insertion in model container [2022-11-16 20:11:22,653 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 16.11 08:11:22" (1/1) ... [2022-11-16 20:11:22,661 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2022-11-16 20:11:22,716 INFO L178 MainTranslator]: Built tables and reachable declarations [2022-11-16 20:11:23,083 WARN L229 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_222461bd-0a09-486d-b4d3-064f768200ab/sv-benchmarks/c/list-ext3-properties/sll_nondet_insert-2.i[24494,24507] [2022-11-16 20:11:23,091 INFO L210 PostProcessor]: Analyzing one entry point: main [2022-11-16 20:11:23,103 INFO L203 MainTranslator]: Completed pre-run [2022-11-16 20:11:23,166 WARN L229 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_222461bd-0a09-486d-b4d3-064f768200ab/sv-benchmarks/c/list-ext3-properties/sll_nondet_insert-2.i[24494,24507] [2022-11-16 20:11:23,170 INFO L210 PostProcessor]: Analyzing one entry point: main [2022-11-16 20:11:23,207 INFO L208 MainTranslator]: Completed translation [2022-11-16 20:11:23,208 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 16.11 08:11:23 WrapperNode [2022-11-16 20:11:23,208 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2022-11-16 20:11:23,209 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2022-11-16 20:11:23,209 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2022-11-16 20:11:23,209 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2022-11-16 20:11:23,217 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 16.11 08:11:23" (1/1) ... [2022-11-16 20:11:23,236 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 16.11 08:11:23" (1/1) ... [2022-11-16 20:11:23,276 INFO L138 Inliner]: procedures = 129, calls = 33, calls flagged for inlining = 6, calls inlined = 6, statements flattened = 129 [2022-11-16 20:11:23,277 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2022-11-16 20:11:23,278 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2022-11-16 20:11:23,278 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2022-11-16 20:11:23,278 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2022-11-16 20:11:23,290 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 16.11 08:11:23" (1/1) ... [2022-11-16 20:11:23,290 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 16.11 08:11:23" (1/1) ... [2022-11-16 20:11:23,310 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 16.11 08:11:23" (1/1) ... [2022-11-16 20:11:23,311 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 16.11 08:11:23" (1/1) ... [2022-11-16 20:11:23,316 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 16.11 08:11:23" (1/1) ... [2022-11-16 20:11:23,330 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 16.11 08:11:23" (1/1) ... [2022-11-16 20:11:23,332 INFO L185 PluginConnector]: Executing the observer LTLStepAnnotator from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 16.11 08:11:23" (1/1) ... [2022-11-16 20:11:23,338 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 16.11 08:11:23" (1/1) ... [2022-11-16 20:11:23,341 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2022-11-16 20:11:23,342 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2022-11-16 20:11:23,342 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2022-11-16 20:11:23,342 INFO L275 PluginConnector]: RCFGBuilder initialized [2022-11-16 20:11:23,343 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 16.11 08:11:23" (1/1) ... [2022-11-16 20:11:23,352 INFO L173 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2022-11-16 20:11:23,363 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_222461bd-0a09-486d-b4d3-064f768200ab/bin/utaipan-Xvt2sAort0/z3 [2022-11-16 20:11:23,380 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_222461bd-0a09-486d-b4d3-064f768200ab/bin/utaipan-Xvt2sAort0/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2022-11-16 20:11:23,411 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_222461bd-0a09-486d-b4d3-064f768200ab/bin/utaipan-Xvt2sAort0/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2022-11-16 20:11:23,431 INFO L130 BoogieDeclarations]: Found specification of procedure myexit [2022-11-16 20:11:23,432 INFO L138 BoogieDeclarations]: Found implementation of procedure myexit [2022-11-16 20:11:23,432 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnHeap [2022-11-16 20:11:23,432 INFO L130 BoogieDeclarations]: Found specification of procedure _get_nondet_int [2022-11-16 20:11:23,432 INFO L138 BoogieDeclarations]: Found implementation of procedure _get_nondet_int [2022-11-16 20:11:23,432 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2022-11-16 20:11:23,432 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2022-11-16 20:11:23,432 INFO L130 BoogieDeclarations]: Found specification of procedure write~$Pointer$ [2022-11-16 20:11:23,433 INFO L130 BoogieDeclarations]: Found specification of procedure read~$Pointer$ [2022-11-16 20:11:23,433 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2022-11-16 20:11:23,433 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~$Pointer$ [2022-11-16 20:11:23,433 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2022-11-16 20:11:23,433 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2022-11-16 20:11:23,433 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2022-11-16 20:11:23,600 INFO L235 CfgBuilder]: Building ICFG [2022-11-16 20:11:23,602 INFO L261 CfgBuilder]: Building CFG for each procedure with an implementation [2022-11-16 20:11:23,641 INFO L769 $ProcedureCfgBuilder]: dead code at ProgramPoint myexitFINAL: assume true; [2022-11-16 20:11:23,886 INFO L276 CfgBuilder]: Performing block encoding [2022-11-16 20:11:23,953 INFO L295 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2022-11-16 20:11:23,953 INFO L300 CfgBuilder]: Removed 6 assume(true) statements. [2022-11-16 20:11:23,956 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 16.11 08:11:23 BoogieIcfgContainer [2022-11-16 20:11:23,956 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2022-11-16 20:11:23,958 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2022-11-16 20:11:23,958 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2022-11-16 20:11:23,961 INFO L275 PluginConnector]: TraceAbstraction initialized [2022-11-16 20:11:23,962 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 16.11 08:11:22" (1/3) ... [2022-11-16 20:11:23,971 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@5000f32b and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 16.11 08:11:23, skipping insertion in model container [2022-11-16 20:11:23,972 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 16.11 08:11:23" (2/3) ... [2022-11-16 20:11:23,972 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@5000f32b and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 16.11 08:11:23, skipping insertion in model container [2022-11-16 20:11:23,972 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 16.11 08:11:23" (3/3) ... [2022-11-16 20:11:23,973 INFO L112 eAbstractionObserver]: Analyzing ICFG sll_nondet_insert-2.i [2022-11-16 20:11:23,993 INFO L203 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2022-11-16 20:11:23,993 INFO L162 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2022-11-16 20:11:24,069 INFO L356 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2022-11-16 20:11:24,075 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=LoopsAndPotentialCycles, 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;@210e917e, mLbeIndependenceSettings=[IndependenceType=SEMANTIC, AbstractionType=NONE, UseConditional=false, UseSemiCommutativity=true, Solver=Z3, SolverTimeout=1000ms] [2022-11-16 20:11:24,076 INFO L358 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2022-11-16 20:11:24,080 INFO L276 IsEmpty]: Start isEmpty. Operand has 34 states, 26 states have (on average 1.5) internal successors, (39), 28 states have internal predecessors, (39), 5 states have call successors, (5), 2 states have call predecessors, (5), 1 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2022-11-16 20:11:24,087 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2022-11-16 20:11:24,088 INFO L187 NwaCegarLoop]: Found error trace [2022-11-16 20:11:24,088 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-16 20:11:24,089 INFO L420 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-16 20:11:24,094 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-16 20:11:24,094 INFO L85 PathProgramCache]: Analyzing trace with hash -1925812613, now seen corresponding path program 1 times [2022-11-16 20:11:24,122 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-16 20:11:24,122 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2132046704] [2022-11-16 20:11:24,123 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-16 20:11:24,124 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-16 20:11:24,252 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-16 20:11:24,312 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2022-11-16 20:11:24,313 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-16 20:11:24,313 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2132046704] [2022-11-16 20:11:24,314 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2132046704] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-16 20:11:24,314 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1287702957] [2022-11-16 20:11:24,314 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-16 20:11:24,315 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-16 20:11:24,315 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_222461bd-0a09-486d-b4d3-064f768200ab/bin/utaipan-Xvt2sAort0/z3 [2022-11-16 20:11:24,318 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_222461bd-0a09-486d-b4d3-064f768200ab/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-16 20:11:24,323 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_222461bd-0a09-486d-b4d3-064f768200ab/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2022-11-16 20:11:24,428 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-16 20:11:24,430 INFO L263 TraceCheckSpWp]: Trace formula consists of 121 conjuncts, 1 conjunts are in the unsatisfiable core [2022-11-16 20:11:24,435 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-16 20:11:24,446 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 2 proven. 0 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2022-11-16 20:11:24,447 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2022-11-16 20:11:24,447 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1287702957] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-16 20:11:24,447 INFO L184 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2022-11-16 20:11:24,448 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [2] total 2 [2022-11-16 20:11:24,450 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [624181541] [2022-11-16 20:11:24,451 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-16 20:11:24,455 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 2 states [2022-11-16 20:11:24,456 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-16 20:11:24,487 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 2 interpolants. [2022-11-16 20:11:24,487 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2022-11-16 20:11:24,489 INFO L87 Difference]: Start difference. First operand has 34 states, 26 states have (on average 1.5) internal successors, (39), 28 states have internal predecessors, (39), 5 states have call successors, (5), 2 states have call predecessors, (5), 1 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) Second operand has 2 states, 2 states have (on average 7.0) internal successors, (14), 2 states have internal predecessors, (14), 2 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2022-11-16 20:11:24,531 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-16 20:11:24,531 INFO L93 Difference]: Finished difference Result 66 states and 94 transitions. [2022-11-16 20:11:24,533 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2022-11-16 20:11:24,534 INFO L78 Accepts]: Start accepts. Automaton has has 2 states, 2 states have (on average 7.0) internal successors, (14), 2 states have internal predecessors, (14), 2 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 19 [2022-11-16 20:11:24,535 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-16 20:11:24,542 INFO L225 Difference]: With dead ends: 66 [2022-11-16 20:11:24,542 INFO L226 Difference]: Without dead ends: 27 [2022-11-16 20:11:24,545 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 20 GetRequests, 20 SyntacticMatches, 0 SemanticMatches, 0 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2022-11-16 20:11:24,548 INFO L413 NwaCegarLoop]: 34 mSDtfsCounter, 0 mSDsluCounter, 0 mSDsCounter, 0 mSdLazyCounter, 9 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 34 SdHoareTripleChecker+Invalid, 9 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 9 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-11-16 20:11:24,549 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [0 Valid, 34 Invalid, 9 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 9 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-11-16 20:11:24,566 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 27 states. [2022-11-16 20:11:24,582 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 27 to 27. [2022-11-16 20:11:24,584 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 27 states, 22 states have (on average 1.2272727272727273) internal successors, (27), 22 states have internal predecessors, (27), 3 states have call successors, (3), 1 states have call predecessors, (3), 1 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2022-11-16 20:11:24,585 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 27 states to 27 states and 33 transitions. [2022-11-16 20:11:24,587 INFO L78 Accepts]: Start accepts. Automaton has 27 states and 33 transitions. Word has length 19 [2022-11-16 20:11:24,587 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-16 20:11:24,587 INFO L495 AbstractCegarLoop]: Abstraction has 27 states and 33 transitions. [2022-11-16 20:11:24,587 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 2 states, 2 states have (on average 7.0) internal successors, (14), 2 states have internal predecessors, (14), 2 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2022-11-16 20:11:24,588 INFO L276 IsEmpty]: Start isEmpty. Operand 27 states and 33 transitions. [2022-11-16 20:11:24,589 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2022-11-16 20:11:24,589 INFO L187 NwaCegarLoop]: Found error trace [2022-11-16 20:11:24,589 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-16 20:11:24,600 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_222461bd-0a09-486d-b4d3-064f768200ab/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0 [2022-11-16 20:11:24,795 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_222461bd-0a09-486d-b4d3-064f768200ab/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable0 [2022-11-16 20:11:24,796 INFO L420 AbstractCegarLoop]: === Iteration 2 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-16 20:11:24,797 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-16 20:11:24,797 INFO L85 PathProgramCache]: Analyzing trace with hash -1978409249, now seen corresponding path program 1 times [2022-11-16 20:11:24,797 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-16 20:11:24,797 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2082735610] [2022-11-16 20:11:24,798 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-16 20:11:24,798 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-16 20:11:24,827 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-16 20:11:25,103 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-11-16 20:11:25,104 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-16 20:11:25,105 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2082735610] [2022-11-16 20:11:25,112 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2082735610] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-16 20:11:25,113 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [523647754] [2022-11-16 20:11:25,113 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-16 20:11:25,114 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-16 20:11:25,115 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_222461bd-0a09-486d-b4d3-064f768200ab/bin/utaipan-Xvt2sAort0/z3 [2022-11-16 20:11:25,116 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_222461bd-0a09-486d-b4d3-064f768200ab/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-16 20:11:25,146 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_222461bd-0a09-486d-b4d3-064f768200ab/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2022-11-16 20:11:25,249 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-16 20:11:25,252 INFO L263 TraceCheckSpWp]: Trace formula consists of 129 conjuncts, 10 conjunts are in the unsatisfiable core [2022-11-16 20:11:25,254 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-16 20:11:25,396 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 5 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-16 20:11:25,396 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2022-11-16 20:11:25,397 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [523647754] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-16 20:11:25,397 INFO L184 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2022-11-16 20:11:25,397 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [7] imperfect sequences [7] total 12 [2022-11-16 20:11:25,397 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [79815741] [2022-11-16 20:11:25,398 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-16 20:11:25,400 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2022-11-16 20:11:25,400 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-16 20:11:25,401 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2022-11-16 20:11:25,403 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=26, Invalid=106, Unknown=0, NotChecked=0, Total=132 [2022-11-16 20:11:25,404 INFO L87 Difference]: Start difference. First operand 27 states and 33 transitions. Second operand has 7 states, 6 states have (on average 3.0) internal successors, (18), 6 states have internal predecessors, (18), 2 states have call successors, (2), 2 states have call predecessors, (2), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2022-11-16 20:11:25,526 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-16 20:11:25,527 INFO L93 Difference]: Finished difference Result 49 states and 60 transitions. [2022-11-16 20:11:25,527 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2022-11-16 20:11:25,528 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 6 states have (on average 3.0) internal successors, (18), 6 states have internal predecessors, (18), 2 states have call successors, (2), 2 states have call predecessors, (2), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) Word has length 22 [2022-11-16 20:11:25,528 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-16 20:11:25,529 INFO L225 Difference]: With dead ends: 49 [2022-11-16 20:11:25,529 INFO L226 Difference]: Without dead ends: 29 [2022-11-16 20:11:25,530 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 29 GetRequests, 18 SyntacticMatches, 0 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 10 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=30, Invalid=126, Unknown=0, NotChecked=0, Total=156 [2022-11-16 20:11:25,531 INFO L413 NwaCegarLoop]: 19 mSDtfsCounter, 1 mSDsluCounter, 85 mSDsCounter, 0 mSdLazyCounter, 86 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1 SdHoareTripleChecker+Valid, 104 SdHoareTripleChecker+Invalid, 87 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 86 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-11-16 20:11:25,531 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [1 Valid, 104 Invalid, 87 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 86 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-11-16 20:11:25,532 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 29 states. [2022-11-16 20:11:25,535 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 29 to 29. [2022-11-16 20:11:25,536 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 29 states, 24 states have (on average 1.2083333333333333) internal successors, (29), 24 states have internal predecessors, (29), 3 states have call successors, (3), 1 states have call predecessors, (3), 1 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2022-11-16 20:11:25,536 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 29 states to 29 states and 35 transitions. [2022-11-16 20:11:25,537 INFO L78 Accepts]: Start accepts. Automaton has 29 states and 35 transitions. Word has length 22 [2022-11-16 20:11:25,538 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-16 20:11:25,538 INFO L495 AbstractCegarLoop]: Abstraction has 29 states and 35 transitions. [2022-11-16 20:11:25,538 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 6 states have (on average 3.0) internal successors, (18), 6 states have internal predecessors, (18), 2 states have call successors, (2), 2 states have call predecessors, (2), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2022-11-16 20:11:25,538 INFO L276 IsEmpty]: Start isEmpty. Operand 29 states and 35 transitions. [2022-11-16 20:11:25,539 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2022-11-16 20:11:25,539 INFO L187 NwaCegarLoop]: Found error trace [2022-11-16 20:11:25,540 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-16 20:11:25,551 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_222461bd-0a09-486d-b4d3-064f768200ab/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Forceful destruction successful, exit code 0 [2022-11-16 20:11:25,746 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1,3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_222461bd-0a09-486d-b4d3-064f768200ab/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-16 20:11:25,746 INFO L420 AbstractCegarLoop]: === Iteration 3 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-16 20:11:25,747 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-16 20:11:25,747 INFO L85 PathProgramCache]: Analyzing trace with hash -1671032506, now seen corresponding path program 1 times [2022-11-16 20:11:25,747 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-16 20:11:25,747 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1652376140] [2022-11-16 20:11:25,748 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-16 20:11:25,748 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-16 20:11:25,772 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-16 20:11:25,899 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 2 proven. 0 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2022-11-16 20:11:25,899 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-16 20:11:25,899 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1652376140] [2022-11-16 20:11:25,900 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1652376140] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-16 20:11:25,900 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-11-16 20:11:25,900 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2022-11-16 20:11:25,900 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [613503162] [2022-11-16 20:11:25,901 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-16 20:11:25,901 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2022-11-16 20:11:25,901 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-16 20:11:25,902 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2022-11-16 20:11:25,902 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2022-11-16 20:11:25,902 INFO L87 Difference]: Start difference. First operand 29 states and 35 transitions. Second operand has 6 states, 6 states have (on average 3.0) internal successors, (18), 6 states have internal predecessors, (18), 2 states have call successors, (2), 1 states have call predecessors, (2), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2022-11-16 20:11:26,014 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-16 20:11:26,015 INFO L93 Difference]: Finished difference Result 47 states and 56 transitions. [2022-11-16 20:11:26,015 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2022-11-16 20:11:26,015 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 3.0) internal successors, (18), 6 states have internal predecessors, (18), 2 states have call successors, (2), 1 states have call predecessors, (2), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) Word has length 26 [2022-11-16 20:11:26,016 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-16 20:11:26,016 INFO L225 Difference]: With dead ends: 47 [2022-11-16 20:11:26,017 INFO L226 Difference]: Without dead ends: 44 [2022-11-16 20:11:26,017 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 10 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=27, Invalid=45, Unknown=0, NotChecked=0, Total=72 [2022-11-16 20:11:26,018 INFO L413 NwaCegarLoop]: 23 mSDtfsCounter, 76 mSDsluCounter, 57 mSDsCounter, 0 mSdLazyCounter, 56 mSolverCounterSat, 7 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 76 SdHoareTripleChecker+Valid, 80 SdHoareTripleChecker+Invalid, 63 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 7 IncrementalHoareTripleChecker+Valid, 56 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-11-16 20:11:26,019 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [76 Valid, 80 Invalid, 63 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [7 Valid, 56 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-11-16 20:11:26,020 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 44 states. [2022-11-16 20:11:26,026 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 44 to 31. [2022-11-16 20:11:26,026 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 31 states, 26 states have (on average 1.2307692307692308) internal successors, (32), 26 states have internal predecessors, (32), 3 states have call successors, (3), 1 states have call predecessors, (3), 1 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2022-11-16 20:11:26,027 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 31 states to 31 states and 38 transitions. [2022-11-16 20:11:26,028 INFO L78 Accepts]: Start accepts. Automaton has 31 states and 38 transitions. Word has length 26 [2022-11-16 20:11:26,028 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-16 20:11:26,028 INFO L495 AbstractCegarLoop]: Abstraction has 31 states and 38 transitions. [2022-11-16 20:11:26,028 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 3.0) internal successors, (18), 6 states have internal predecessors, (18), 2 states have call successors, (2), 1 states have call predecessors, (2), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2022-11-16 20:11:26,029 INFO L276 IsEmpty]: Start isEmpty. Operand 31 states and 38 transitions. [2022-11-16 20:11:26,029 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2022-11-16 20:11:26,030 INFO L187 NwaCegarLoop]: Found error trace [2022-11-16 20:11:26,030 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-16 20:11:26,030 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2022-11-16 20:11:26,030 INFO L420 AbstractCegarLoop]: === Iteration 4 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-16 20:11:26,031 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-16 20:11:26,031 INFO L85 PathProgramCache]: Analyzing trace with hash -264023654, now seen corresponding path program 1 times [2022-11-16 20:11:26,031 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-16 20:11:26,031 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2063764580] [2022-11-16 20:11:26,032 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-16 20:11:26,032 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-16 20:11:26,052 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-16 20:11:26,286 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2022-11-16 20:11:26,287 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-16 20:11:26,287 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2063764580] [2022-11-16 20:11:26,290 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2063764580] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-16 20:11:26,292 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1612690428] [2022-11-16 20:11:26,292 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-16 20:11:26,295 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-16 20:11:26,296 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_222461bd-0a09-486d-b4d3-064f768200ab/bin/utaipan-Xvt2sAort0/z3 [2022-11-16 20:11:26,297 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_222461bd-0a09-486d-b4d3-064f768200ab/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-16 20:11:26,319 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_222461bd-0a09-486d-b4d3-064f768200ab/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2022-11-16 20:11:26,411 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-16 20:11:26,413 INFO L263 TraceCheckSpWp]: Trace formula consists of 170 conjuncts, 12 conjunts are in the unsatisfiable core [2022-11-16 20:11:26,415 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-16 20:11:26,514 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 5 proven. 2 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-11-16 20:11:26,516 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-16 20:11:26,702 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2022-11-16 20:11:26,702 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1612690428] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-16 20:11:26,703 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [579454668] [2022-11-16 20:11:26,727 INFO L159 IcfgInterpreter]: Started Sifa with 20 locations of interest [2022-11-16 20:11:26,728 INFO L166 IcfgInterpreter]: Building call graph [2022-11-16 20:11:26,732 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-16 20:11:26,737 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-16 20:11:26,738 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-16 20:11:26,951 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-16 20:11:26,973 INFO L321 Elim1Store]: treesize reduction 11, result has 45.0 percent of original size [2022-11-16 20:11:26,974 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 3 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 17 treesize of output 26 [2022-11-16 20:11:26,991 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-16 20:11:27,014 INFO L321 Elim1Store]: treesize reduction 18, result has 35.7 percent of original size [2022-11-16 20:11:27,016 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 4 select indices, 4 select index equivalence classes, 5 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 2 case distinctions, treesize of input 27 treesize of output 37 [2022-11-16 20:11:27,062 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-16 20:11:27,073 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-16 20:11:27,119 INFO L321 Elim1Store]: treesize reduction 36, result has 34.5 percent of original size [2022-11-16 20:11:27,119 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 8 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 4 case distinctions, treesize of input 32 treesize of output 49 [2022-11-16 20:11:27,144 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-16 20:11:27,145 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-16 20:11:27,148 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 8 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 0 case distinctions, treesize of input 22 treesize of output 30 [2022-11-16 20:11:27,201 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 3 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2022-11-16 20:11:27,222 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-16 20:11:27,225 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 4 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 30 treesize of output 21 [2022-11-16 20:11:27,251 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 3 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2022-11-16 20:11:27,498 INFO L321 Elim1Store]: treesize reduction 124, result has 24.8 percent of original size [2022-11-16 20:11:27,498 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 6 select indices, 6 select index equivalence classes, 4 disjoint index pairs (out of 15 index pairs), introduced 6 new quantified variables, introduced 15 case distinctions, treesize of input 235 treesize of output 259 [2022-11-16 20:11:27,561 INFO L321 Elim1Store]: treesize reduction 64, result has 19.0 percent of original size [2022-11-16 20:11:27,562 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 4 select indices, 4 select index equivalence classes, 4 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 7 case distinctions, treesize of input 228 treesize of output 237 [2022-11-16 20:11:27,874 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-16 20:11:27,888 INFO L321 Elim1Store]: treesize reduction 17, result has 29.2 percent of original size [2022-11-16 20:11:27,889 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 3 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 233 treesize of output 232 [2022-11-16 20:11:27,905 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-16 20:11:27,918 INFO L321 Elim1Store]: treesize reduction 29, result has 27.5 percent of original size [2022-11-16 20:11:27,919 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 3 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 273 treesize of output 272 [2022-11-16 20:11:27,935 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-16 20:11:27,937 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 4 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 293 treesize of output 276 [2022-11-16 20:11:28,018 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 12 treesize of output 9 [2022-11-16 20:11:28,027 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2022-11-16 20:11:28,042 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 1 [2022-11-16 20:11:28,049 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2022-11-16 20:11:28,058 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2022-11-16 20:11:28,083 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2022-11-16 20:11:28,090 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 12 treesize of output 9 [2022-11-16 20:11:28,305 INFO L197 IcfgInterpreter]: Interpreting procedure _get_nondet_int with input of size 65 for LOIs [2022-11-16 20:11:28,440 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-16 20:11:30,655 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '713#(and (= |ULTIMATE.start_main_~len~2#1| 2) (= |ULTIMATE.start_sll_length_~head#1.base| 0) (= |ULTIMATE.start_main_~i~0#1| 0) (<= |ULTIMATE.start_sll_length_#res#1| 2147483647) (<= |ULTIMATE.start_sll_create_~head~0#1.offset| 0) (<= (+ |ULTIMATE.start_sll_create_~len#1| 1) 0) (<= 0 |ULTIMATE.start_sll_length_~len~0#1|) (<= |ULTIMATE.start_sll_create_#res#1.offset| 0) (not (= (+ |ULTIMATE.start_main_~len~2#1| |ULTIMATE.start_main_~k~0#1|) |ULTIMATE.start_sll_length_#res#1|)) (= |ULTIMATE.start_main_~k~0#1| 0) (<= |ULTIMATE.start_sll_create_#in~len#1| 2) (= |ULTIMATE.start_main_~#s~0#1.offset| 0) (= |#NULL.offset| 0) (= |ULTIMATE.start_sll_length_~head#1.offset| 0) (<= 0 |ULTIMATE.start_main_~#s~0#1.base|) (= |ULTIMATE.start_sll_length_~len~0#1| |ULTIMATE.start_sll_length_#res#1|) (<= 0 |ULTIMATE.start_sll_create_#res#1.offset|) (<= 0 |#StackHeapBarrier|) (<= 2 |ULTIMATE.start_sll_create_#in~len#1|) (<= 0 |ULTIMATE.start_sll_create_~head~0#1.offset|) (= |#NULL.base| 0))' at error location [2022-11-16 20:11:30,655 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-16 20:11:30,656 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-16 20:11:30,656 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 8, 8] total 15 [2022-11-16 20:11:30,656 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1011831100] [2022-11-16 20:11:30,656 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-16 20:11:30,657 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 15 states [2022-11-16 20:11:30,657 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-16 20:11:30,657 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2022-11-16 20:11:30,658 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=110, Invalid=820, Unknown=0, NotChecked=0, Total=930 [2022-11-16 20:11:30,658 INFO L87 Difference]: Start difference. First operand 31 states and 38 transitions. Second operand has 15 states, 12 states have (on average 3.1666666666666665) internal successors, (38), 13 states have internal predecessors, (38), 2 states have call successors, (3), 2 states have call predecessors, (3), 5 states have return successors, (5), 3 states have call predecessors, (5), 2 states have call successors, (5) [2022-11-16 20:11:30,966 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-16 20:11:30,966 INFO L93 Difference]: Finished difference Result 71 states and 89 transitions. [2022-11-16 20:11:30,967 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2022-11-16 20:11:30,967 INFO L78 Accepts]: Start accepts. Automaton has has 15 states, 12 states have (on average 3.1666666666666665) internal successors, (38), 13 states have internal predecessors, (38), 2 states have call successors, (3), 2 states have call predecessors, (3), 5 states have return successors, (5), 3 states have call predecessors, (5), 2 states have call successors, (5) Word has length 27 [2022-11-16 20:11:30,967 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-16 20:11:30,969 INFO L225 Difference]: With dead ends: 71 [2022-11-16 20:11:30,969 INFO L226 Difference]: Without dead ends: 49 [2022-11-16 20:11:30,970 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 95 GetRequests, 56 SyntacticMatches, 4 SemanticMatches, 35 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 346 ImplicationChecksByTransitivity, 2.4s TimeCoverageRelationStatistics Valid=158, Invalid=1174, Unknown=0, NotChecked=0, Total=1332 [2022-11-16 20:11:30,971 INFO L413 NwaCegarLoop]: 20 mSDtfsCounter, 10 mSDsluCounter, 179 mSDsCounter, 0 mSdLazyCounter, 195 mSolverCounterSat, 8 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 10 SdHoareTripleChecker+Valid, 199 SdHoareTripleChecker+Invalid, 203 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 8 IncrementalHoareTripleChecker+Valid, 195 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-11-16 20:11:30,971 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [10 Valid, 199 Invalid, 203 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [8 Valid, 195 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-11-16 20:11:30,972 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 49 states. [2022-11-16 20:11:30,977 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 49 to 35. [2022-11-16 20:11:30,978 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 35 states, 30 states have (on average 1.2) internal successors, (36), 30 states have internal predecessors, (36), 3 states have call successors, (3), 1 states have call predecessors, (3), 1 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2022-11-16 20:11:30,978 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 35 states to 35 states and 42 transitions. [2022-11-16 20:11:30,979 INFO L78 Accepts]: Start accepts. Automaton has 35 states and 42 transitions. Word has length 27 [2022-11-16 20:11:30,979 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-16 20:11:30,979 INFO L495 AbstractCegarLoop]: Abstraction has 35 states and 42 transitions. [2022-11-16 20:11:30,979 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 15 states, 12 states have (on average 3.1666666666666665) internal successors, (38), 13 states have internal predecessors, (38), 2 states have call successors, (3), 2 states have call predecessors, (3), 5 states have return successors, (5), 3 states have call predecessors, (5), 2 states have call successors, (5) [2022-11-16 20:11:30,979 INFO L276 IsEmpty]: Start isEmpty. Operand 35 states and 42 transitions. [2022-11-16 20:11:30,980 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 32 [2022-11-16 20:11:30,980 INFO L187 NwaCegarLoop]: Found error trace [2022-11-16 20:11:30,980 INFO L195 NwaCegarLoop]: trace histogram [3, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-16 20:11:30,990 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_222461bd-0a09-486d-b4d3-064f768200ab/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Ended with exit code 0 [2022-11-16 20:11:31,186 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3,4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_222461bd-0a09-486d-b4d3-064f768200ab/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-16 20:11:31,186 INFO L420 AbstractCegarLoop]: === Iteration 5 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-16 20:11:31,186 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-16 20:11:31,187 INFO L85 PathProgramCache]: Analyzing trace with hash -2092726381, now seen corresponding path program 2 times [2022-11-16 20:11:31,187 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-16 20:11:31,187 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1179805921] [2022-11-16 20:11:31,187 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-16 20:11:31,187 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-16 20:11:31,206 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-16 20:11:31,420 INFO L134 CoverageAnalysis]: Checked inductivity of 14 backedges. 4 proven. 5 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2022-11-16 20:11:31,420 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-16 20:11:31,420 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1179805921] [2022-11-16 20:11:31,420 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1179805921] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-16 20:11:31,420 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1376029617] [2022-11-16 20:11:31,421 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-11-16 20:11:31,421 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-16 20:11:31,421 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_222461bd-0a09-486d-b4d3-064f768200ab/bin/utaipan-Xvt2sAort0/z3 [2022-11-16 20:11:31,422 INFO L229 MonitoredProcess]: Starting monitored process 5 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_222461bd-0a09-486d-b4d3-064f768200ab/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-16 20:11:31,443 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_222461bd-0a09-486d-b4d3-064f768200ab/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2022-11-16 20:11:31,532 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2022-11-16 20:11:31,532 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-16 20:11:31,534 INFO L263 TraceCheckSpWp]: Trace formula consists of 204 conjuncts, 37 conjunts are in the unsatisfiable core [2022-11-16 20:11:31,536 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-16 20:11:31,572 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2022-11-16 20:11:31,728 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 7 [2022-11-16 20:11:31,767 INFO L321 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2022-11-16 20:11:31,767 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 3 new quantified variables, introduced 1 case distinctions, treesize of input 24 treesize of output 23 [2022-11-16 20:11:31,774 INFO L134 CoverageAnalysis]: Checked inductivity of 14 backedges. 9 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-16 20:11:31,774 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-16 20:11:31,796 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 25 treesize of output 17 [2022-11-16 20:11:31,869 INFO L321 Elim1Store]: treesize reduction 11, result has 64.5 percent of original size [2022-11-16 20:11:31,870 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 3 select indices, 3 select index equivalence classes, 0 disjoint index pairs (out of 3 index pairs), introduced 4 new quantified variables, introduced 3 case distinctions, treesize of input 133 treesize of output 132 [2022-11-16 20:11:31,914 INFO L134 CoverageAnalysis]: Checked inductivity of 14 backedges. 4 proven. 5 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2022-11-16 20:11:31,915 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1376029617] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-16 20:11:31,915 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1661457529] [2022-11-16 20:11:31,917 INFO L159 IcfgInterpreter]: Started Sifa with 20 locations of interest [2022-11-16 20:11:31,918 INFO L166 IcfgInterpreter]: Building call graph [2022-11-16 20:11:31,918 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-16 20:11:31,918 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-16 20:11:31,918 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-16 20:11:31,965 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-16 20:11:31,977 INFO L321 Elim1Store]: treesize reduction 11, result has 45.0 percent of original size [2022-11-16 20:11:31,977 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 3 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 17 treesize of output 26 [2022-11-16 20:11:31,987 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-16 20:11:32,002 INFO L321 Elim1Store]: treesize reduction 18, result has 35.7 percent of original size [2022-11-16 20:11:32,002 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 4 select indices, 4 select index equivalence classes, 5 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 2 case distinctions, treesize of input 27 treesize of output 37 [2022-11-16 20:11:32,025 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-16 20:11:32,028 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-16 20:11:32,055 INFO L321 Elim1Store]: treesize reduction 36, result has 34.5 percent of original size [2022-11-16 20:11:32,055 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 8 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 4 case distinctions, treesize of input 32 treesize of output 49 [2022-11-16 20:11:32,070 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-16 20:11:32,071 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-16 20:11:32,072 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 8 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 0 case distinctions, treesize of input 22 treesize of output 30 [2022-11-16 20:11:32,099 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 3 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2022-11-16 20:11:32,108 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 3 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2022-11-16 20:11:32,120 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-16 20:11:32,121 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 4 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 30 treesize of output 21 [2022-11-16 20:11:32,270 INFO L321 Elim1Store]: treesize reduction 92, result has 21.4 percent of original size [2022-11-16 20:11:32,270 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 4 select indices, 4 select index equivalence classes, 2 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 9 case distinctions, treesize of input 230 treesize of output 239 [2022-11-16 20:11:32,366 INFO L321 Elim1Store]: treesize reduction 132, result has 20.0 percent of original size [2022-11-16 20:11:32,367 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 6 select indices, 6 select index equivalence classes, 4 disjoint index pairs (out of 15 index pairs), introduced 6 new quantified variables, introduced 15 case distinctions, treesize of input 233 treesize of output 249 [2022-11-16 20:11:32,610 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-16 20:11:32,624 INFO L321 Elim1Store]: treesize reduction 17, result has 29.2 percent of original size [2022-11-16 20:11:32,624 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 233 treesize of output 232 [2022-11-16 20:11:32,641 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-16 20:11:32,654 INFO L321 Elim1Store]: treesize reduction 29, result has 27.5 percent of original size [2022-11-16 20:11:32,655 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 273 treesize of output 272 [2022-11-16 20:11:32,669 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-16 20:11:32,682 INFO L321 Elim1Store]: treesize reduction 21, result has 25.0 percent of original size [2022-11-16 20:11:32,683 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 2 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 293 treesize of output 276 [2022-11-16 20:11:32,745 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 12 treesize of output 9 [2022-11-16 20:11:32,753 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2022-11-16 20:11:32,768 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 1 [2022-11-16 20:11:32,775 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2022-11-16 20:11:32,787 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2022-11-16 20:11:32,814 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 12 treesize of output 9 [2022-11-16 20:11:32,820 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2022-11-16 20:11:33,019 INFO L197 IcfgInterpreter]: Interpreting procedure _get_nondet_int with input of size 65 for LOIs [2022-11-16 20:11:33,119 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-16 20:11:35,326 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '1088#(and (= |ULTIMATE.start_main_~len~2#1| 2) (= |ULTIMATE.start_sll_length_~head#1.base| 0) (= |ULTIMATE.start_main_~i~0#1| 0) (<= |ULTIMATE.start_sll_length_#res#1| 2147483647) (<= |ULTIMATE.start_sll_create_~head~0#1.offset| 0) (<= (+ |ULTIMATE.start_sll_create_~len#1| 1) 0) (<= 0 |ULTIMATE.start_sll_length_~len~0#1|) (<= |ULTIMATE.start_sll_create_#res#1.offset| 0) (not (= (+ |ULTIMATE.start_main_~len~2#1| |ULTIMATE.start_main_~k~0#1|) |ULTIMATE.start_sll_length_#res#1|)) (= |ULTIMATE.start_main_~k~0#1| 0) (<= |ULTIMATE.start_sll_create_#in~len#1| 2) (= |ULTIMATE.start_main_~#s~0#1.offset| 0) (= |#NULL.offset| 0) (= |ULTIMATE.start_sll_length_~head#1.offset| 0) (<= 0 |ULTIMATE.start_main_~#s~0#1.base|) (= |ULTIMATE.start_sll_length_~len~0#1| |ULTIMATE.start_sll_length_#res#1|) (<= 0 |ULTIMATE.start_sll_create_#res#1.offset|) (<= 0 |#StackHeapBarrier|) (<= 2 |ULTIMATE.start_sll_create_#in~len#1|) (<= 0 |ULTIMATE.start_sll_create_~head~0#1.offset|) (= |#NULL.base| 0))' at error location [2022-11-16 20:11:35,326 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-16 20:11:35,326 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-16 20:11:35,326 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 10, 8] total 14 [2022-11-16 20:11:35,327 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [83123046] [2022-11-16 20:11:35,327 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-16 20:11:35,327 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 14 states [2022-11-16 20:11:35,327 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-16 20:11:35,328 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2022-11-16 20:11:35,328 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=90, Invalid=780, Unknown=0, NotChecked=0, Total=870 [2022-11-16 20:11:35,328 INFO L87 Difference]: Start difference. First operand 35 states and 42 transitions. Second operand has 14 states, 14 states have (on average 2.857142857142857) internal successors, (40), 14 states have internal predecessors, (40), 3 states have call successors, (3), 2 states have call predecessors, (3), 2 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2022-11-16 20:11:35,613 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-16 20:11:35,614 INFO L93 Difference]: Finished difference Result 53 states and 62 transitions. [2022-11-16 20:11:35,614 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2022-11-16 20:11:35,614 INFO L78 Accepts]: Start accepts. Automaton has has 14 states, 14 states have (on average 2.857142857142857) internal successors, (40), 14 states have internal predecessors, (40), 3 states have call successors, (3), 2 states have call predecessors, (3), 2 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) Word has length 31 [2022-11-16 20:11:35,615 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-16 20:11:35,615 INFO L225 Difference]: With dead ends: 53 [2022-11-16 20:11:35,615 INFO L226 Difference]: Without dead ends: 50 [2022-11-16 20:11:35,616 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 106 GetRequests, 72 SyntacticMatches, 1 SemanticMatches, 33 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 250 ImplicationChecksByTransitivity, 2.4s TimeCoverageRelationStatistics Valid=131, Invalid=1059, Unknown=0, NotChecked=0, Total=1190 [2022-11-16 20:11:35,617 INFO L413 NwaCegarLoop]: 27 mSDtfsCounter, 20 mSDsluCounter, 269 mSDsCounter, 0 mSdLazyCounter, 143 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 21 SdHoareTripleChecker+Valid, 296 SdHoareTripleChecker+Invalid, 208 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 143 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 64 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-11-16 20:11:35,617 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [21 Valid, 296 Invalid, 208 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 143 Invalid, 0 Unknown, 64 Unchecked, 0.2s Time] [2022-11-16 20:11:35,618 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 50 states. [2022-11-16 20:11:35,624 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 50 to 41. [2022-11-16 20:11:35,624 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 41 states, 35 states have (on average 1.2) internal successors, (42), 35 states have internal predecessors, (42), 3 states have call successors, (3), 2 states have call predecessors, (3), 2 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2022-11-16 20:11:35,625 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 41 states to 41 states and 48 transitions. [2022-11-16 20:11:35,625 INFO L78 Accepts]: Start accepts. Automaton has 41 states and 48 transitions. Word has length 31 [2022-11-16 20:11:35,625 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-16 20:11:35,625 INFO L495 AbstractCegarLoop]: Abstraction has 41 states and 48 transitions. [2022-11-16 20:11:35,626 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 14 states, 14 states have (on average 2.857142857142857) internal successors, (40), 14 states have internal predecessors, (40), 3 states have call successors, (3), 2 states have call predecessors, (3), 2 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2022-11-16 20:11:35,626 INFO L276 IsEmpty]: Start isEmpty. Operand 41 states and 48 transitions. [2022-11-16 20:11:35,626 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 33 [2022-11-16 20:11:35,627 INFO L187 NwaCegarLoop]: Found error trace [2022-11-16 20:11:35,627 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] [2022-11-16 20:11:35,636 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_222461bd-0a09-486d-b4d3-064f768200ab/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Forceful destruction successful, exit code 0 [2022-11-16 20:11:35,836 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,5 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_222461bd-0a09-486d-b4d3-064f768200ab/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-16 20:11:35,836 INFO L420 AbstractCegarLoop]: === Iteration 6 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-16 20:11:35,837 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-16 20:11:35,837 INFO L85 PathProgramCache]: Analyzing trace with hash -451631891, now seen corresponding path program 3 times [2022-11-16 20:11:35,837 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-16 20:11:35,837 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1543663798] [2022-11-16 20:11:35,837 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-16 20:11:35,837 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-16 20:11:35,867 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-16 20:11:36,269 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 13 trivial. 0 not checked. [2022-11-16 20:11:36,269 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-16 20:11:36,269 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1543663798] [2022-11-16 20:11:36,269 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1543663798] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-16 20:11:36,269 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1064709441] [2022-11-16 20:11:36,269 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-11-16 20:11:36,270 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-16 20:11:36,270 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_222461bd-0a09-486d-b4d3-064f768200ab/bin/utaipan-Xvt2sAort0/z3 [2022-11-16 20:11:36,272 INFO L229 MonitoredProcess]: Starting monitored process 6 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_222461bd-0a09-486d-b4d3-064f768200ab/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-16 20:11:36,297 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_222461bd-0a09-486d-b4d3-064f768200ab/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2022-11-16 20:11:36,390 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-11-16 20:11:36,390 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-16 20:11:36,392 INFO L263 TraceCheckSpWp]: Trace formula consists of 211 conjuncts, 39 conjunts are in the unsatisfiable core [2022-11-16 20:11:36,394 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-16 20:11:36,506 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 13 trivial. 0 not checked. [2022-11-16 20:11:36,506 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-16 20:11:36,794 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 0 proven. 7 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2022-11-16 20:11:36,794 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1064709441] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-16 20:11:36,795 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [452649539] [2022-11-16 20:11:36,797 INFO L159 IcfgInterpreter]: Started Sifa with 20 locations of interest [2022-11-16 20:11:36,797 INFO L166 IcfgInterpreter]: Building call graph [2022-11-16 20:11:36,797 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-16 20:11:36,797 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-16 20:11:36,798 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-16 20:11:36,847 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-16 20:11:36,862 INFO L321 Elim1Store]: treesize reduction 18, result has 35.7 percent of original size [2022-11-16 20:11:36,863 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 4 select indices, 4 select index equivalence classes, 5 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 2 case distinctions, treesize of input 27 treesize of output 37 [2022-11-16 20:11:36,872 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-16 20:11:36,872 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 4 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 22 [2022-11-16 20:11:36,894 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-16 20:11:36,896 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-16 20:11:36,922 INFO L321 Elim1Store]: treesize reduction 20, result has 48.7 percent of original size [2022-11-16 20:11:36,922 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 6 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 2 case distinctions, treesize of input 22 treesize of output 38 [2022-11-16 20:11:36,935 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-16 20:11:36,938 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-16 20:11:36,967 INFO L321 Elim1Store]: treesize reduction 36, result has 34.5 percent of original size [2022-11-16 20:11:36,968 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 8 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 4 case distinctions, treesize of input 32 treesize of output 49 [2022-11-16 20:11:37,001 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-16 20:11:37,002 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 4 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 30 treesize of output 21 [2022-11-16 20:11:37,014 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 3 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2022-11-16 20:11:37,026 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 3 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2022-11-16 20:11:37,194 INFO L321 Elim1Store]: treesize reduction 124, result has 24.8 percent of original size [2022-11-16 20:11:37,195 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 6 select indices, 6 select index equivalence classes, 4 disjoint index pairs (out of 15 index pairs), introduced 6 new quantified variables, introduced 15 case distinctions, treesize of input 235 treesize of output 259 [2022-11-16 20:11:37,272 INFO L321 Elim1Store]: treesize reduction 64, result has 19.0 percent of original size [2022-11-16 20:11:37,273 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 4 select indices, 4 select index equivalence classes, 4 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 7 case distinctions, treesize of input 228 treesize of output 237 [2022-11-16 20:11:37,513 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-16 20:11:37,514 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 4 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 237 treesize of output 220 [2022-11-16 20:11:37,539 INFO L321 Elim1Store]: treesize reduction 17, result has 29.2 percent of original size [2022-11-16 20:11:37,539 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 3 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 233 treesize of output 232 [2022-11-16 20:11:37,569 INFO L321 Elim1Store]: treesize reduction 17, result has 29.2 percent of original size [2022-11-16 20:11:37,569 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 3 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 241 treesize of output 240 [2022-11-16 20:11:37,640 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2022-11-16 20:11:37,649 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 12 treesize of output 9 [2022-11-16 20:11:37,663 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2022-11-16 20:11:37,670 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 1 [2022-11-16 20:11:37,677 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2022-11-16 20:11:37,700 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 12 treesize of output 9 [2022-11-16 20:11:37,706 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2022-11-16 20:11:37,883 INFO L197 IcfgInterpreter]: Interpreting procedure _get_nondet_int with input of size 65 for LOIs [2022-11-16 20:11:38,008 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-16 20:11:40,082 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '1457#(and (= |ULTIMATE.start_main_~len~2#1| 2) (= |ULTIMATE.start_sll_length_~head#1.base| 0) (= |ULTIMATE.start_main_~i~0#1| 0) (<= |ULTIMATE.start_sll_length_#res#1| 2147483647) (<= |ULTIMATE.start_sll_create_~head~0#1.offset| 0) (<= (+ |ULTIMATE.start_sll_create_~len#1| 1) 0) (<= 0 |ULTIMATE.start_sll_length_~len~0#1|) (<= |ULTIMATE.start_sll_create_#res#1.offset| 0) (not (= (+ |ULTIMATE.start_main_~len~2#1| |ULTIMATE.start_main_~k~0#1|) |ULTIMATE.start_sll_length_#res#1|)) (= |ULTIMATE.start_main_~k~0#1| 0) (<= |ULTIMATE.start_sll_create_#in~len#1| 2) (= |ULTIMATE.start_main_~#s~0#1.offset| 0) (= |#NULL.offset| 0) (= |ULTIMATE.start_sll_length_~head#1.offset| 0) (<= 0 |ULTIMATE.start_main_~#s~0#1.base|) (= |ULTIMATE.start_sll_length_~len~0#1| |ULTIMATE.start_sll_length_#res#1|) (<= 0 |ULTIMATE.start_sll_create_#res#1.offset|) (<= 0 |#StackHeapBarrier|) (<= 2 |ULTIMATE.start_sll_create_#in~len#1|) (<= 0 |ULTIMATE.start_sll_create_~head~0#1.offset|) (= |#NULL.base| 0))' at error location [2022-11-16 20:11:40,082 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-16 20:11:40,082 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-16 20:11:40,083 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 12, 14] total 22 [2022-11-16 20:11:40,083 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2105499021] [2022-11-16 20:11:40,083 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-16 20:11:40,083 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 22 states [2022-11-16 20:11:40,083 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-16 20:11:40,084 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2022-11-16 20:11:40,085 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=155, Invalid=1251, Unknown=0, NotChecked=0, Total=1406 [2022-11-16 20:11:40,085 INFO L87 Difference]: Start difference. First operand 41 states and 48 transitions. Second operand has 22 states, 19 states have (on average 1.736842105263158) internal successors, (33), 19 states have internal predecessors, (33), 2 states have call successors, (2), 1 states have call predecessors, (2), 3 states have return successors, (4), 3 states have call predecessors, (4), 2 states have call successors, (4) [2022-11-16 20:11:40,647 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-16 20:11:40,647 INFO L93 Difference]: Finished difference Result 113 states and 138 transitions. [2022-11-16 20:11:40,651 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2022-11-16 20:11:40,651 INFO L78 Accepts]: Start accepts. Automaton has has 22 states, 19 states have (on average 1.736842105263158) internal successors, (33), 19 states have internal predecessors, (33), 2 states have call successors, (2), 1 states have call predecessors, (2), 3 states have return successors, (4), 3 states have call predecessors, (4), 2 states have call successors, (4) Word has length 32 [2022-11-16 20:11:40,652 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-16 20:11:40,653 INFO L225 Difference]: With dead ends: 113 [2022-11-16 20:11:40,653 INFO L226 Difference]: Without dead ends: 110 [2022-11-16 20:11:40,653 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 115 GetRequests, 71 SyntacticMatches, 2 SemanticMatches, 42 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 526 ImplicationChecksByTransitivity, 2.4s TimeCoverageRelationStatistics Valid=203, Invalid=1689, Unknown=0, NotChecked=0, Total=1892 [2022-11-16 20:11:40,654 INFO L413 NwaCegarLoop]: 19 mSDtfsCounter, 80 mSDsluCounter, 247 mSDsCounter, 0 mSdLazyCounter, 471 mSolverCounterSat, 14 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 86 SdHoareTripleChecker+Valid, 266 SdHoareTripleChecker+Invalid, 485 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 14 IncrementalHoareTripleChecker+Valid, 471 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2022-11-16 20:11:40,654 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [86 Valid, 266 Invalid, 485 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [14 Valid, 471 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2022-11-16 20:11:40,655 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 110 states. [2022-11-16 20:11:40,677 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 110 to 75. [2022-11-16 20:11:40,678 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 75 states, 65 states have (on average 1.2307692307692308) internal successors, (80), 66 states have internal predecessors, (80), 5 states have call successors, (5), 2 states have call predecessors, (5), 4 states have return successors, (10), 6 states have call predecessors, (10), 5 states have call successors, (10) [2022-11-16 20:11:40,679 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 75 states to 75 states and 95 transitions. [2022-11-16 20:11:40,679 INFO L78 Accepts]: Start accepts. Automaton has 75 states and 95 transitions. Word has length 32 [2022-11-16 20:11:40,679 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-16 20:11:40,679 INFO L495 AbstractCegarLoop]: Abstraction has 75 states and 95 transitions. [2022-11-16 20:11:40,680 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 22 states, 19 states have (on average 1.736842105263158) internal successors, (33), 19 states have internal predecessors, (33), 2 states have call successors, (2), 1 states have call predecessors, (2), 3 states have return successors, (4), 3 states have call predecessors, (4), 2 states have call successors, (4) [2022-11-16 20:11:40,680 INFO L276 IsEmpty]: Start isEmpty. Operand 75 states and 95 transitions. [2022-11-16 20:11:40,681 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 34 [2022-11-16 20:11:40,681 INFO L187 NwaCegarLoop]: Found error trace [2022-11-16 20:11:40,681 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] [2022-11-16 20:11:40,692 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_222461bd-0a09-486d-b4d3-064f768200ab/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Forceful destruction successful, exit code 0 [2022-11-16 20:11:40,887 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5,6 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_222461bd-0a09-486d-b4d3-064f768200ab/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-16 20:11:40,888 INFO L420 AbstractCegarLoop]: === Iteration 7 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-16 20:11:40,888 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-16 20:11:40,888 INFO L85 PathProgramCache]: Analyzing trace with hash -1117310253, now seen corresponding path program 4 times [2022-11-16 20:11:40,888 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-16 20:11:40,888 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [176330608] [2022-11-16 20:11:40,888 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-16 20:11:40,889 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-16 20:11:40,931 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-16 20:11:41,536 INFO L134 CoverageAnalysis]: Checked inductivity of 19 backedges. 3 proven. 11 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2022-11-16 20:11:41,536 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-16 20:11:41,536 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [176330608] [2022-11-16 20:11:41,536 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [176330608] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-16 20:11:41,536 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1765984419] [2022-11-16 20:11:41,536 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-11-16 20:11:41,537 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-16 20:11:41,537 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_222461bd-0a09-486d-b4d3-064f768200ab/bin/utaipan-Xvt2sAort0/z3 [2022-11-16 20:11:41,539 INFO L229 MonitoredProcess]: Starting monitored process 7 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_222461bd-0a09-486d-b4d3-064f768200ab/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-16 20:11:41,548 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_222461bd-0a09-486d-b4d3-064f768200ab/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Waiting until timeout for monitored process [2022-11-16 20:11:41,655 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-16 20:11:41,657 INFO L263 TraceCheckSpWp]: Trace formula consists of 218 conjuncts, 66 conjunts are in the unsatisfiable core [2022-11-16 20:11:41,662 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-16 20:11:41,678 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2022-11-16 20:11:41,717 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2022-11-16 20:11:41,725 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2022-11-16 20:11:41,772 INFO L321 Elim1Store]: treesize reduction 4, result has 50.0 percent of original size [2022-11-16 20:11:41,773 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 11 treesize of output 11 [2022-11-16 20:11:41,831 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 18 [2022-11-16 20:11:41,835 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 23 treesize of output 22 [2022-11-16 20:11:42,323 INFO L321 Elim1Store]: treesize reduction 80, result has 28.6 percent of original size [2022-11-16 20:11:42,324 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 5 select indices, 5 select index equivalence classes, 0 disjoint index pairs (out of 10 index pairs), introduced 9 new quantified variables, introduced 10 case distinctions, treesize of input 120 treesize of output 91 [2022-11-16 20:11:42,352 INFO L321 Elim1Store]: treesize reduction 58, result has 10.8 percent of original size [2022-11-16 20:11:42,352 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 5 select indices, 5 select index equivalence classes, 1 disjoint index pairs (out of 10 index pairs), introduced 7 new quantified variables, introduced 6 case distinctions, treesize of input 70 treesize of output 46 [2022-11-16 20:11:42,366 INFO L134 CoverageAnalysis]: Checked inductivity of 19 backedges. 8 proven. 11 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-16 20:11:42,366 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-16 20:11:42,868 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-16 20:11:42,951 INFO L321 Elim1Store]: treesize reduction 39, result has 72.5 percent of original size [2022-11-16 20:11:42,951 INFO L350 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 5 new quantified variables, introduced 6 case distinctions, treesize of input 2716 treesize of output 2562 [2022-11-16 20:12:18,011 WARN L233 SmtUtils]: Spent 34.68s on a formula simplification. DAG size of input: 2487 DAG size of output: 917 (called from [L 318] de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.arrays.Elim1Store.elim1) [2022-11-16 20:12:18,014 INFO L321 Elim1Store]: treesize reduction 5738, result has 28.2 percent of original size [2022-11-16 20:12:18,016 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 40 select indices, 40 select index equivalence classes, 0 disjoint index pairs (out of 780 index pairs), introduced 49 new quantified variables, introduced 780 case distinctions, treesize of input 107945 treesize of output 87875 [2022-11-16 20:12:30,304 WARN L233 SmtUtils]: Spent 12.28s on a formula simplification. DAG size of input: 2307 DAG size of output: 2271 (called from [L 800] de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher.simplify)