./Ultimate.py --spec ../../sv-benchmarks/c/properties/unreach-call.prp --file ../../sv-benchmarks/c/nla-digbench-scaling/egcd3-ll_valuebound5.c --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_57ae48b7-7ca4-47ad-a8e2-3457df15573e/bin/utaipan-Xvt2sAort0/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_57ae48b7-7ca4-47ad-a8e2-3457df15573e/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_57ae48b7-7ca4-47ad-a8e2-3457df15573e/bin/utaipan-Xvt2sAort0/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_57ae48b7-7ca4-47ad-a8e2-3457df15573e/bin/utaipan-Xvt2sAort0/config/TaipanReach.xml -i ../../sv-benchmarks/c/nla-digbench-scaling/egcd3-ll_valuebound5.c -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_57ae48b7-7ca4-47ad-a8e2-3457df15573e/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_57ae48b7-7ca4-47ad-a8e2-3457df15573e/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 1aca3c96522e618238f11f200c96e0ec490e756d4e04895bd2a51f9a4ff85af1 --- 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 16:10:33,572 INFO L177 SettingsManager]: Resetting all preferences to default values... [2022-11-16 16:10:33,574 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2022-11-16 16:10:33,616 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2022-11-16 16:10:33,616 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2022-11-16 16:10:33,617 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2022-11-16 16:10:33,619 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2022-11-16 16:10:33,621 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2022-11-16 16:10:33,622 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2022-11-16 16:10:33,632 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2022-11-16 16:10:33,633 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2022-11-16 16:10:33,637 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2022-11-16 16:10:33,637 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2022-11-16 16:10:33,640 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2022-11-16 16:10:33,643 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2022-11-16 16:10:33,645 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2022-11-16 16:10:33,647 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2022-11-16 16:10:33,648 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2022-11-16 16:10:33,651 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2022-11-16 16:10:33,659 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2022-11-16 16:10:33,661 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2022-11-16 16:10:33,662 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2022-11-16 16:10:33,666 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2022-11-16 16:10:33,668 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2022-11-16 16:10:33,675 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2022-11-16 16:10:33,676 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2022-11-16 16:10:33,676 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2022-11-16 16:10:33,677 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2022-11-16 16:10:33,678 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2022-11-16 16:10:33,679 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2022-11-16 16:10:33,679 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2022-11-16 16:10:33,680 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2022-11-16 16:10:33,681 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2022-11-16 16:10:33,682 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2022-11-16 16:10:33,683 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2022-11-16 16:10:33,684 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2022-11-16 16:10:33,685 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2022-11-16 16:10:33,685 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2022-11-16 16:10:33,686 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2022-11-16 16:10:33,687 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2022-11-16 16:10:33,687 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2022-11-16 16:10:33,688 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_57ae48b7-7ca4-47ad-a8e2-3457df15573e/bin/utaipan-Xvt2sAort0/config/svcomp-Reach-32bit-Taipan_Default.epf [2022-11-16 16:10:33,726 INFO L113 SettingsManager]: Loading preferences was successful [2022-11-16 16:10:33,727 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2022-11-16 16:10:33,727 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2022-11-16 16:10:33,728 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2022-11-16 16:10:33,729 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2022-11-16 16:10:33,729 INFO L138 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2022-11-16 16:10:33,729 INFO L138 SettingsManager]: * User list type=DISABLED [2022-11-16 16:10:33,730 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2022-11-16 16:10:33,730 INFO L138 SettingsManager]: * Explicit value domain=true [2022-11-16 16:10:33,730 INFO L138 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2022-11-16 16:10:33,731 INFO L138 SettingsManager]: * Octagon Domain=false [2022-11-16 16:10:33,732 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2022-11-16 16:10:33,732 INFO L138 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2022-11-16 16:10:33,732 INFO L138 SettingsManager]: * Use the RCFG-of-the-future interface=true [2022-11-16 16:10:33,733 INFO L138 SettingsManager]: * Interval Domain=false [2022-11-16 16:10:33,733 INFO L136 SettingsManager]: Preferences of Sifa differ from their defaults: [2022-11-16 16:10:33,733 INFO L138 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2022-11-16 16:10:33,733 INFO L138 SettingsManager]: * Simplification Technique=POLY_PAC [2022-11-16 16:10:33,734 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2022-11-16 16:10:33,735 INFO L138 SettingsManager]: * sizeof long=4 [2022-11-16 16:10:33,735 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2022-11-16 16:10:33,735 INFO L138 SettingsManager]: * sizeof POINTER=4 [2022-11-16 16:10:33,735 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2022-11-16 16:10:33,736 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2022-11-16 16:10:33,736 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2022-11-16 16:10:33,736 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2022-11-16 16:10:33,736 INFO L138 SettingsManager]: * sizeof long double=12 [2022-11-16 16:10:33,737 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2022-11-16 16:10:33,737 INFO L138 SettingsManager]: * Use constant arrays=true [2022-11-16 16:10:33,737 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2022-11-16 16:10:33,738 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2022-11-16 16:10:33,738 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2022-11-16 16:10:33,738 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2022-11-16 16:10:33,739 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2022-11-16 16:10:33,739 INFO L138 SettingsManager]: * Abstract interpretation Mode=USE_PREDICATES [2022-11-16 16:10:33,739 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2022-11-16 16:10:33,740 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2022-11-16 16:10:33,740 INFO L138 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2022-11-16 16:10:33,741 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2022-11-16 16:10:33,741 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2022-11-16 16:10:33,741 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2022-11-16 16:10:33,742 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_57ae48b7-7ca4-47ad-a8e2-3457df15573e/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_57ae48b7-7ca4-47ad-a8e2-3457df15573e/bin/utaipan-Xvt2sAort0 Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> 1aca3c96522e618238f11f200c96e0ec490e756d4e04895bd2a51f9a4ff85af1 [2022-11-16 16:10:34,099 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2022-11-16 16:10:34,133 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2022-11-16 16:10:34,136 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2022-11-16 16:10:34,137 INFO L271 PluginConnector]: Initializing CDTParser... [2022-11-16 16:10:34,138 INFO L275 PluginConnector]: CDTParser initialized [2022-11-16 16:10:34,140 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_57ae48b7-7ca4-47ad-a8e2-3457df15573e/bin/utaipan-Xvt2sAort0/../../sv-benchmarks/c/nla-digbench-scaling/egcd3-ll_valuebound5.c [2022-11-16 16:10:34,217 INFO L220 CDTParser]: Created temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_57ae48b7-7ca4-47ad-a8e2-3457df15573e/bin/utaipan-Xvt2sAort0/data/bb1bc16b9/71d9901527d34c75830ff4d8caa2ef27/FLAG8d84a1c27 [2022-11-16 16:10:34,673 INFO L306 CDTParser]: Found 1 translation units. [2022-11-16 16:10:34,674 INFO L160 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_57ae48b7-7ca4-47ad-a8e2-3457df15573e/sv-benchmarks/c/nla-digbench-scaling/egcd3-ll_valuebound5.c [2022-11-16 16:10:34,680 INFO L349 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_57ae48b7-7ca4-47ad-a8e2-3457df15573e/bin/utaipan-Xvt2sAort0/data/bb1bc16b9/71d9901527d34c75830ff4d8caa2ef27/FLAG8d84a1c27 [2022-11-16 16:10:35,053 INFO L357 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_57ae48b7-7ca4-47ad-a8e2-3457df15573e/bin/utaipan-Xvt2sAort0/data/bb1bc16b9/71d9901527d34c75830ff4d8caa2ef27 [2022-11-16 16:10:35,057 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2022-11-16 16:10:35,059 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2022-11-16 16:10:35,064 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2022-11-16 16:10:35,064 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2022-11-16 16:10:35,068 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2022-11-16 16:10:35,068 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 16.11 04:10:35" (1/1) ... [2022-11-16 16:10:35,070 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@43a7e51b and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 16.11 04:10:35, skipping insertion in model container [2022-11-16 16:10:35,071 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 16.11 04:10:35" (1/1) ... [2022-11-16 16:10:35,079 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2022-11-16 16:10:35,100 INFO L178 MainTranslator]: Built tables and reachable declarations [2022-11-16 16:10:35,297 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_57ae48b7-7ca4-47ad-a8e2-3457df15573e/sv-benchmarks/c/nla-digbench-scaling/egcd3-ll_valuebound5.c[490,503] [2022-11-16 16:10:35,330 INFO L210 PostProcessor]: Analyzing one entry point: main [2022-11-16 16:10:35,343 INFO L203 MainTranslator]: Completed pre-run [2022-11-16 16:10:35,354 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_57ae48b7-7ca4-47ad-a8e2-3457df15573e/sv-benchmarks/c/nla-digbench-scaling/egcd3-ll_valuebound5.c[490,503] [2022-11-16 16:10:35,368 INFO L210 PostProcessor]: Analyzing one entry point: main [2022-11-16 16:10:35,380 INFO L208 MainTranslator]: Completed translation [2022-11-16 16:10:35,380 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 16.11 04:10:35 WrapperNode [2022-11-16 16:10:35,381 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2022-11-16 16:10:35,382 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2022-11-16 16:10:35,382 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2022-11-16 16:10:35,382 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2022-11-16 16:10:35,390 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 16.11 04:10:35" (1/1) ... [2022-11-16 16:10:35,398 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 16.11 04:10:35" (1/1) ... [2022-11-16 16:10:35,429 INFO L138 Inliner]: procedures = 14, calls = 16, calls flagged for inlining = 2, calls inlined = 2, statements flattened = 80 [2022-11-16 16:10:35,430 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2022-11-16 16:10:35,431 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2022-11-16 16:10:35,431 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2022-11-16 16:10:35,431 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2022-11-16 16:10:35,442 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 16.11 04:10:35" (1/1) ... [2022-11-16 16:10:35,442 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 16.11 04:10:35" (1/1) ... [2022-11-16 16:10:35,457 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 16.11 04:10:35" (1/1) ... [2022-11-16 16:10:35,457 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 16.11 04:10:35" (1/1) ... [2022-11-16 16:10:35,460 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 16.11 04:10:35" (1/1) ... [2022-11-16 16:10:35,464 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 16.11 04:10:35" (1/1) ... [2022-11-16 16:10:35,465 INFO L185 PluginConnector]: Executing the observer LTLStepAnnotator from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 16.11 04:10:35" (1/1) ... [2022-11-16 16:10:35,466 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 16.11 04:10:35" (1/1) ... [2022-11-16 16:10:35,468 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2022-11-16 16:10:35,469 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2022-11-16 16:10:35,469 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2022-11-16 16:10:35,469 INFO L275 PluginConnector]: RCFGBuilder initialized [2022-11-16 16:10:35,479 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 16.11 04:10:35" (1/1) ... [2022-11-16 16:10:35,487 INFO L173 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2022-11-16 16:10:35,498 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_57ae48b7-7ca4-47ad-a8e2-3457df15573e/bin/utaipan-Xvt2sAort0/z3 [2022-11-16 16:10:35,516 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_57ae48b7-7ca4-47ad-a8e2-3457df15573e/bin/utaipan-Xvt2sAort0/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2022-11-16 16:10:35,518 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_57ae48b7-7ca4-47ad-a8e2-3457df15573e/bin/utaipan-Xvt2sAort0/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2022-11-16 16:10:35,569 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2022-11-16 16:10:35,569 INFO L130 BoogieDeclarations]: Found specification of procedure assume_abort_if_not [2022-11-16 16:10:35,569 INFO L138 BoogieDeclarations]: Found implementation of procedure assume_abort_if_not [2022-11-16 16:10:35,569 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2022-11-16 16:10:35,569 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2022-11-16 16:10:35,569 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2022-11-16 16:10:35,569 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2022-11-16 16:10:35,570 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2022-11-16 16:10:35,642 INFO L235 CfgBuilder]: Building ICFG [2022-11-16 16:10:35,645 INFO L261 CfgBuilder]: Building CFG for each procedure with an implementation [2022-11-16 16:10:35,862 INFO L276 CfgBuilder]: Performing block encoding [2022-11-16 16:10:35,906 INFO L295 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2022-11-16 16:10:35,906 INFO L300 CfgBuilder]: Removed 3 assume(true) statements. [2022-11-16 16:10:35,909 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 16.11 04:10:35 BoogieIcfgContainer [2022-11-16 16:10:35,909 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2022-11-16 16:10:35,913 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2022-11-16 16:10:35,913 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2022-11-16 16:10:35,916 INFO L275 PluginConnector]: TraceAbstraction initialized [2022-11-16 16:10:35,917 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 16.11 04:10:35" (1/3) ... [2022-11-16 16:10:35,917 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@236dfa53 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 16.11 04:10:35, skipping insertion in model container [2022-11-16 16:10:35,918 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 16.11 04:10:35" (2/3) ... [2022-11-16 16:10:35,918 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@236dfa53 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 16.11 04:10:35, skipping insertion in model container [2022-11-16 16:10:35,918 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 16.11 04:10:35" (3/3) ... [2022-11-16 16:10:35,919 INFO L112 eAbstractionObserver]: Analyzing ICFG egcd3-ll_valuebound5.c [2022-11-16 16:10:35,938 INFO L203 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2022-11-16 16:10:35,938 INFO L162 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2022-11-16 16:10:35,991 INFO L356 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2022-11-16 16:10:36,001 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;@14887a8c, mLbeIndependenceSettings=[IndependenceType=SEMANTIC, AbstractionType=NONE, UseConditional=false, UseSemiCommutativity=true, Solver=Z3, SolverTimeout=1000ms] [2022-11-16 16:10:36,001 INFO L358 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2022-11-16 16:10:36,007 INFO L276 IsEmpty]: Start isEmpty. Operand has 30 states, 17 states have (on average 1.4705882352941178) internal successors, (25), 18 states have internal predecessors, (25), 9 states have call successors, (9), 2 states have call predecessors, (9), 2 states have return successors, (9), 9 states have call predecessors, (9), 9 states have call successors, (9) [2022-11-16 16:10:36,015 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2022-11-16 16:10:36,015 INFO L187 NwaCegarLoop]: Found error trace [2022-11-16 16:10:36,016 INFO L195 NwaCegarLoop]: trace histogram [4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-16 16:10:36,017 INFO L420 AbstractCegarLoop]: === Iteration 1 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-16 16:10:36,024 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-16 16:10:36,024 INFO L85 PathProgramCache]: Analyzing trace with hash 1539547475, now seen corresponding path program 1 times [2022-11-16 16:10:36,033 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-16 16:10:36,034 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [4557825] [2022-11-16 16:10:36,034 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-16 16:10:36,034 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-16 16:10:36,173 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-16 16:10:36,226 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-16 16:10:36,227 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [4557825] [2022-11-16 16:10:36,228 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unsupported non-linear arithmetic [2022-11-16 16:10:36,228 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [39745187] [2022-11-16 16:10:36,228 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-16 16:10:36,228 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-16 16:10:36,229 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_57ae48b7-7ca4-47ad-a8e2-3457df15573e/bin/utaipan-Xvt2sAort0/z3 [2022-11-16 16:10:36,238 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_57ae48b7-7ca4-47ad-a8e2-3457df15573e/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-16 16:10:36,263 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_57ae48b7-7ca4-47ad-a8e2-3457df15573e/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2022-11-16 16:10:36,331 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-16 16:10:36,333 INFO L263 TraceCheckSpWp]: Trace formula consists of 85 conjuncts, 1 conjunts are in the unsatisfiable core [2022-11-16 16:10:36,338 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-16 16:10:36,362 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2022-11-16 16:10:36,362 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2022-11-16 16:10:36,363 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [39745187] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-16 16:10:36,363 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-11-16 16:10:36,363 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2022-11-16 16:10:36,365 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [862339688] [2022-11-16 16:10:36,366 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-16 16:10:36,370 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 2 states [2022-11-16 16:10:36,370 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-16 16:10:36,408 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 2 interpolants. [2022-11-16 16:10:36,409 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2022-11-16 16:10:36,411 INFO L87 Difference]: Start difference. First operand has 30 states, 17 states have (on average 1.4705882352941178) internal successors, (25), 18 states have internal predecessors, (25), 9 states have call successors, (9), 2 states have call predecessors, (9), 2 states have return successors, (9), 9 states have call predecessors, (9), 9 states have call successors, (9) Second operand has 2 states, 2 states have (on average 4.0) internal successors, (8), 2 states have internal predecessors, (8), 2 states have call successors, (5), 2 states have call predecessors, (5), 1 states have return successors, (4), 1 states have call predecessors, (4), 1 states have call successors, (4) [2022-11-16 16:10:36,456 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-16 16:10:36,456 INFO L93 Difference]: Finished difference Result 51 states and 79 transitions. [2022-11-16 16:10:36,457 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2022-11-16 16:10:36,458 INFO L78 Accepts]: Start accepts. Automaton has has 2 states, 2 states have (on average 4.0) internal successors, (8), 2 states have internal predecessors, (8), 2 states have call successors, (5), 2 states have call predecessors, (5), 1 states have return successors, (4), 1 states have call predecessors, (4), 1 states have call successors, (4) Word has length 20 [2022-11-16 16:10:36,459 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-16 16:10:36,466 INFO L225 Difference]: With dead ends: 51 [2022-11-16 16:10:36,466 INFO L226 Difference]: Without dead ends: 28 [2022-11-16 16:10:36,469 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 19 GetRequests, 19 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 16:10:36,473 INFO L413 NwaCegarLoop]: 36 mSDtfsCounter, 0 mSDsluCounter, 0 mSDsCounter, 0 mSdLazyCounter, 3 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 36 SdHoareTripleChecker+Invalid, 5 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 3 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-11-16 16:10:36,474 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [0 Valid, 36 Invalid, 5 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 3 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-11-16 16:10:36,491 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 28 states. [2022-11-16 16:10:36,507 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 28 to 28. [2022-11-16 16:10:36,509 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 28 states, 16 states have (on average 1.25) internal successors, (20), 17 states have internal predecessors, (20), 9 states have call successors, (9), 2 states have call predecessors, (9), 2 states have return successors, (8), 8 states have call predecessors, (8), 8 states have call successors, (8) [2022-11-16 16:10:36,510 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 28 states to 28 states and 37 transitions. [2022-11-16 16:10:36,512 INFO L78 Accepts]: Start accepts. Automaton has 28 states and 37 transitions. Word has length 20 [2022-11-16 16:10:36,513 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-16 16:10:36,513 INFO L495 AbstractCegarLoop]: Abstraction has 28 states and 37 transitions. [2022-11-16 16:10:36,513 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 2 states, 2 states have (on average 4.0) internal successors, (8), 2 states have internal predecessors, (8), 2 states have call successors, (5), 2 states have call predecessors, (5), 1 states have return successors, (4), 1 states have call predecessors, (4), 1 states have call successors, (4) [2022-11-16 16:10:36,514 INFO L276 IsEmpty]: Start isEmpty. Operand 28 states and 37 transitions. [2022-11-16 16:10:36,515 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2022-11-16 16:10:36,515 INFO L187 NwaCegarLoop]: Found error trace [2022-11-16 16:10:36,515 INFO L195 NwaCegarLoop]: trace histogram [4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-16 16:10:36,523 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_57ae48b7-7ca4-47ad-a8e2-3457df15573e/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0 [2022-11-16 16:10:36,721 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_57ae48b7-7ca4-47ad-a8e2-3457df15573e/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable0 [2022-11-16 16:10:36,722 INFO L420 AbstractCegarLoop]: === Iteration 2 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-16 16:10:36,723 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-16 16:10:36,723 INFO L85 PathProgramCache]: Analyzing trace with hash 1863391506, now seen corresponding path program 1 times [2022-11-16 16:10:36,723 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-16 16:10:36,723 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [286291297] [2022-11-16 16:10:36,723 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-16 16:10:36,724 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-16 16:10:36,744 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-11-16 16:10:36,744 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [2059891696] [2022-11-16 16:10:36,744 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-16 16:10:36,745 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-16 16:10:36,745 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_57ae48b7-7ca4-47ad-a8e2-3457df15573e/bin/utaipan-Xvt2sAort0/z3 [2022-11-16 16:10:36,746 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_57ae48b7-7ca4-47ad-a8e2-3457df15573e/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-16 16:10:36,776 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_57ae48b7-7ca4-47ad-a8e2-3457df15573e/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2022-11-16 16:10:36,849 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-16 16:10:36,850 INFO L263 TraceCheckSpWp]: Trace formula consists of 87 conjuncts, 7 conjunts are in the unsatisfiable core [2022-11-16 16:10:36,852 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-16 16:10:36,975 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 3 proven. 0 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2022-11-16 16:10:36,976 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2022-11-16 16:10:36,976 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-16 16:10:36,979 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [286291297] [2022-11-16 16:10:36,980 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-11-16 16:10:36,980 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2059891696] [2022-11-16 16:10:36,980 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2059891696] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-16 16:10:36,980 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-11-16 16:10:36,981 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2022-11-16 16:10:36,981 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [711365247] [2022-11-16 16:10:36,981 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-16 16:10:36,982 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2022-11-16 16:10:36,983 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-16 16:10:36,984 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2022-11-16 16:10:36,986 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2022-11-16 16:10:36,986 INFO L87 Difference]: Start difference. First operand 28 states and 37 transitions. Second operand has 5 states, 4 states have (on average 2.5) internal successors, (10), 4 states have internal predecessors, (10), 2 states have call successors, (5), 2 states have call predecessors, (5), 2 states have return successors, (4), 2 states have call predecessors, (4), 1 states have call successors, (4) [2022-11-16 16:10:37,118 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-16 16:10:37,118 INFO L93 Difference]: Finished difference Result 47 states and 62 transitions. [2022-11-16 16:10:37,119 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2022-11-16 16:10:37,119 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 4 states have (on average 2.5) internal successors, (10), 4 states have internal predecessors, (10), 2 states have call successors, (5), 2 states have call predecessors, (5), 2 states have return successors, (4), 2 states have call predecessors, (4), 1 states have call successors, (4) Word has length 21 [2022-11-16 16:10:37,120 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-16 16:10:37,121 INFO L225 Difference]: With dead ends: 47 [2022-11-16 16:10:37,121 INFO L226 Difference]: Without dead ends: 40 [2022-11-16 16:10:37,121 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 21 GetRequests, 17 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2022-11-16 16:10:37,123 INFO L413 NwaCegarLoop]: 30 mSDtfsCounter, 30 mSDsluCounter, 48 mSDsCounter, 0 mSdLazyCounter, 59 mSolverCounterSat, 8 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 34 SdHoareTripleChecker+Valid, 78 SdHoareTripleChecker+Invalid, 67 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 8 IncrementalHoareTripleChecker+Valid, 59 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-11-16 16:10:37,124 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [34 Valid, 78 Invalid, 67 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [8 Valid, 59 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-11-16 16:10:37,125 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 40 states. [2022-11-16 16:10:37,132 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 40 to 30. [2022-11-16 16:10:37,132 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 30 states, 18 states have (on average 1.2222222222222223) internal successors, (22), 19 states have internal predecessors, (22), 9 states have call successors, (9), 2 states have call predecessors, (9), 2 states have return successors, (8), 8 states have call predecessors, (8), 8 states have call successors, (8) [2022-11-16 16:10:37,134 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 30 states to 30 states and 39 transitions. [2022-11-16 16:10:37,134 INFO L78 Accepts]: Start accepts. Automaton has 30 states and 39 transitions. Word has length 21 [2022-11-16 16:10:37,134 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-16 16:10:37,135 INFO L495 AbstractCegarLoop]: Abstraction has 30 states and 39 transitions. [2022-11-16 16:10:37,136 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 4 states have (on average 2.5) internal successors, (10), 4 states have internal predecessors, (10), 2 states have call successors, (5), 2 states have call predecessors, (5), 2 states have return successors, (4), 2 states have call predecessors, (4), 1 states have call successors, (4) [2022-11-16 16:10:37,136 INFO L276 IsEmpty]: Start isEmpty. Operand 30 states and 39 transitions. [2022-11-16 16:10:37,137 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2022-11-16 16:10:37,138 INFO L187 NwaCegarLoop]: Found error trace [2022-11-16 16:10:37,138 INFO L195 NwaCegarLoop]: trace histogram [4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-16 16:10:37,147 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_57ae48b7-7ca4-47ad-a8e2-3457df15573e/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Forceful destruction successful, exit code 0 [2022-11-16 16:10:37,343 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1,3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_57ae48b7-7ca4-47ad-a8e2-3457df15573e/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-16 16:10:37,344 INFO L420 AbstractCegarLoop]: === Iteration 3 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-16 16:10:37,344 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-16 16:10:37,345 INFO L85 PathProgramCache]: Analyzing trace with hash -73319670, now seen corresponding path program 1 times [2022-11-16 16:10:37,345 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-16 16:10:37,345 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [343484104] [2022-11-16 16:10:37,345 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-16 16:10:37,345 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-16 16:10:37,362 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-11-16 16:10:37,363 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [872070642] [2022-11-16 16:10:37,363 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-16 16:10:37,363 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-16 16:10:37,363 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_57ae48b7-7ca4-47ad-a8e2-3457df15573e/bin/utaipan-Xvt2sAort0/z3 [2022-11-16 16:10:37,364 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_57ae48b7-7ca4-47ad-a8e2-3457df15573e/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-16 16:10:37,384 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_57ae48b7-7ca4-47ad-a8e2-3457df15573e/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2022-11-16 16:10:37,440 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-16 16:10:37,442 INFO L263 TraceCheckSpWp]: Trace formula consists of 97 conjuncts, 17 conjunts are in the unsatisfiable core [2022-11-16 16:10:37,444 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-16 16:10:37,582 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 3 proven. 0 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2022-11-16 16:10:37,582 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2022-11-16 16:10:37,583 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-16 16:10:37,583 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [343484104] [2022-11-16 16:10:37,583 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-11-16 16:10:37,583 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [872070642] [2022-11-16 16:10:37,583 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [872070642] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-16 16:10:37,584 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-11-16 16:10:37,584 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [7] imperfect sequences [] total 7 [2022-11-16 16:10:37,584 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1525440833] [2022-11-16 16:10:37,584 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-16 16:10:37,585 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2022-11-16 16:10:37,585 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-16 16:10:37,585 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2022-11-16 16:10:37,586 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=12, Invalid=30, Unknown=0, NotChecked=0, Total=42 [2022-11-16 16:10:37,586 INFO L87 Difference]: Start difference. First operand 30 states and 39 transitions. Second operand has 7 states, 6 states have (on average 2.1666666666666665) internal successors, (13), 5 states have internal predecessors, (13), 2 states have call successors, (5), 2 states have call predecessors, (5), 2 states have return successors, (4), 2 states have call predecessors, (4), 1 states have call successors, (4) [2022-11-16 16:10:37,702 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-16 16:10:37,702 INFO L93 Difference]: Finished difference Result 46 states and 60 transitions. [2022-11-16 16:10:37,703 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2022-11-16 16:10:37,703 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 6 states have (on average 2.1666666666666665) internal successors, (13), 5 states have internal predecessors, (13), 2 states have call successors, (5), 2 states have call predecessors, (5), 2 states have return successors, (4), 2 states have call predecessors, (4), 1 states have call successors, (4) Word has length 24 [2022-11-16 16:10:37,703 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-16 16:10:37,704 INFO L225 Difference]: With dead ends: 46 [2022-11-16 16:10:37,704 INFO L226 Difference]: Without dead ends: 44 [2022-11-16 16:10:37,705 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 24 GetRequests, 18 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=16, Invalid=40, Unknown=0, NotChecked=0, Total=56 [2022-11-16 16:10:37,706 INFO L413 NwaCegarLoop]: 29 mSDtfsCounter, 31 mSDsluCounter, 85 mSDsCounter, 0 mSdLazyCounter, 85 mSolverCounterSat, 4 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 39 SdHoareTripleChecker+Valid, 114 SdHoareTripleChecker+Invalid, 89 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 4 IncrementalHoareTripleChecker+Valid, 85 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-11-16 16:10:37,707 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [39 Valid, 114 Invalid, 89 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [4 Valid, 85 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-11-16 16:10:37,707 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 44 states. [2022-11-16 16:10:37,716 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 44 to 43. [2022-11-16 16:10:37,716 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 43 states, 26 states have (on average 1.2307692307692308) internal successors, (32), 27 states have internal predecessors, (32), 13 states have call successors, (13), 3 states have call predecessors, (13), 3 states have return successors, (12), 12 states have call predecessors, (12), 12 states have call successors, (12) [2022-11-16 16:10:37,717 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 43 states to 43 states and 57 transitions. [2022-11-16 16:10:37,718 INFO L78 Accepts]: Start accepts. Automaton has 43 states and 57 transitions. Word has length 24 [2022-11-16 16:10:37,718 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-16 16:10:37,718 INFO L495 AbstractCegarLoop]: Abstraction has 43 states and 57 transitions. [2022-11-16 16:10:37,718 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 6 states have (on average 2.1666666666666665) internal successors, (13), 5 states have internal predecessors, (13), 2 states have call successors, (5), 2 states have call predecessors, (5), 2 states have return successors, (4), 2 states have call predecessors, (4), 1 states have call successors, (4) [2022-11-16 16:10:37,718 INFO L276 IsEmpty]: Start isEmpty. Operand 43 states and 57 transitions. [2022-11-16 16:10:37,719 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2022-11-16 16:10:37,719 INFO L187 NwaCegarLoop]: Found error trace [2022-11-16 16:10:37,720 INFO L195 NwaCegarLoop]: trace histogram [4, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-16 16:10:37,730 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_57ae48b7-7ca4-47ad-a8e2-3457df15573e/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Forceful destruction successful, exit code 0 [2022-11-16 16:10:37,924 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_57ae48b7-7ca4-47ad-a8e2-3457df15573e/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable2 [2022-11-16 16:10:37,925 INFO L420 AbstractCegarLoop]: === Iteration 4 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-16 16:10:37,925 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-16 16:10:37,925 INFO L85 PathProgramCache]: Analyzing trace with hash -1101454984, now seen corresponding path program 1 times [2022-11-16 16:10:37,925 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-16 16:10:37,926 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2084244365] [2022-11-16 16:10:37,926 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-16 16:10:37,926 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-16 16:10:37,942 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-11-16 16:10:37,943 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [666412533] [2022-11-16 16:10:37,943 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-16 16:10:37,943 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-16 16:10:37,944 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_57ae48b7-7ca4-47ad-a8e2-3457df15573e/bin/utaipan-Xvt2sAort0/z3 [2022-11-16 16:10:37,945 INFO L229 MonitoredProcess]: Starting monitored process 5 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_57ae48b7-7ca4-47ad-a8e2-3457df15573e/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-16 16:10:37,973 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_57ae48b7-7ca4-47ad-a8e2-3457df15573e/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2022-11-16 16:10:38,009 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-16 16:10:38,011 INFO L263 TraceCheckSpWp]: Trace formula consists of 109 conjuncts, 9 conjunts are in the unsatisfiable core [2022-11-16 16:10:38,013 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-16 16:10:38,074 INFO L134 CoverageAnalysis]: Checked inductivity of 14 backedges. 2 proven. 3 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2022-11-16 16:10:38,074 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-16 16:10:38,198 INFO L134 CoverageAnalysis]: Checked inductivity of 14 backedges. 2 proven. 3 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2022-11-16 16:10:38,198 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-16 16:10:38,199 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2084244365] [2022-11-16 16:10:38,199 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-11-16 16:10:38,199 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [666412533] [2022-11-16 16:10:38,200 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [666412533] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-16 16:10:38,200 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [349542319] [2022-11-16 16:10:38,224 INFO L159 IcfgInterpreter]: Started Sifa with 19 locations of interest [2022-11-16 16:10:38,224 INFO L166 IcfgInterpreter]: Building call graph [2022-11-16 16:10:38,229 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-16 16:10:38,236 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-16 16:10:38,236 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-16 16:10:39,249 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 59 for LOIs [2022-11-16 16:10:39,276 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-16 16:10:41,488 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSifa [349542319] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-16 16:10:41,488 INFO L184 FreeRefinementEngine]: Found 1 perfect and 2 imperfect interpolant sequences. [2022-11-16 16:10:41,489 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [12] imperfect sequences [7, 7] total 18 [2022-11-16 16:10:41,489 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2010811330] [2022-11-16 16:10:41,490 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-16 16:10:41,490 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 13 states [2022-11-16 16:10:41,490 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-16 16:10:41,491 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2022-11-16 16:10:41,491 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=92, Invalid=214, Unknown=0, NotChecked=0, Total=306 [2022-11-16 16:10:41,491 INFO L87 Difference]: Start difference. First operand 43 states and 57 transitions. Second operand has 13 states, 8 states have (on average 1.625) internal successors, (13), 7 states have internal predecessors, (13), 5 states have call successors, (5), 2 states have call predecessors, (5), 1 states have return successors, (4), 4 states have call predecessors, (4), 4 states have call successors, (4) [2022-11-16 16:10:41,884 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-16 16:10:41,884 INFO L93 Difference]: Finished difference Result 71 states and 97 transitions. [2022-11-16 16:10:41,886 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2022-11-16 16:10:41,886 INFO L78 Accepts]: Start accepts. Automaton has has 13 states, 8 states have (on average 1.625) internal successors, (13), 7 states have internal predecessors, (13), 5 states have call successors, (5), 2 states have call predecessors, (5), 1 states have return successors, (4), 4 states have call predecessors, (4), 4 states have call successors, (4) Word has length 26 [2022-11-16 16:10:41,887 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-16 16:10:41,892 INFO L225 Difference]: With dead ends: 71 [2022-11-16 16:10:41,892 INFO L226 Difference]: Without dead ends: 64 [2022-11-16 16:10:41,894 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 76 GetRequests, 54 SyntacticMatches, 6 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 34 ImplicationChecksByTransitivity, 2.2s TimeCoverageRelationStatistics Valid=92, Invalid=214, Unknown=0, NotChecked=0, Total=306 [2022-11-16 16:10:41,900 INFO L413 NwaCegarLoop]: 19 mSDtfsCounter, 57 mSDsluCounter, 39 mSDsCounter, 0 mSdLazyCounter, 153 mSolverCounterSat, 23 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 69 SdHoareTripleChecker+Valid, 58 SdHoareTripleChecker+Invalid, 176 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 23 IncrementalHoareTripleChecker+Valid, 153 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2022-11-16 16:10:41,904 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [69 Valid, 58 Invalid, 176 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [23 Valid, 153 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2022-11-16 16:10:41,906 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 64 states. [2022-11-16 16:10:41,940 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 64 to 50. [2022-11-16 16:10:41,940 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 50 states, 33 states have (on average 1.2424242424242424) internal successors, (41), 34 states have internal predecessors, (41), 13 states have call successors, (13), 3 states have call predecessors, (13), 3 states have return successors, (12), 12 states have call predecessors, (12), 12 states have call successors, (12) [2022-11-16 16:10:41,946 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 50 states to 50 states and 66 transitions. [2022-11-16 16:10:41,947 INFO L78 Accepts]: Start accepts. Automaton has 50 states and 66 transitions. Word has length 26 [2022-11-16 16:10:41,947 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-16 16:10:41,947 INFO L495 AbstractCegarLoop]: Abstraction has 50 states and 66 transitions. [2022-11-16 16:10:41,947 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 13 states, 8 states have (on average 1.625) internal successors, (13), 7 states have internal predecessors, (13), 5 states have call successors, (5), 2 states have call predecessors, (5), 1 states have return successors, (4), 4 states have call predecessors, (4), 4 states have call successors, (4) [2022-11-16 16:10:41,948 INFO L276 IsEmpty]: Start isEmpty. Operand 50 states and 66 transitions. [2022-11-16 16:10:41,949 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 30 [2022-11-16 16:10:41,949 INFO L187 NwaCegarLoop]: Found error trace [2022-11-16 16:10:41,949 INFO L195 NwaCegarLoop]: trace histogram [4, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-16 16:10:41,960 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_57ae48b7-7ca4-47ad-a8e2-3457df15573e/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Forceful destruction successful, exit code 0 [2022-11-16 16:10:42,154 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3,5 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_57ae48b7-7ca4-47ad-a8e2-3457df15573e/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-16 16:10:42,155 INFO L420 AbstractCegarLoop]: === Iteration 5 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-16 16:10:42,155 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-16 16:10:42,155 INFO L85 PathProgramCache]: Analyzing trace with hash -156943002, now seen corresponding path program 1 times [2022-11-16 16:10:42,156 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-16 16:10:42,156 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1097464975] [2022-11-16 16:10:42,156 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-16 16:10:42,156 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-16 16:10:42,169 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-11-16 16:10:42,169 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1775581379] [2022-11-16 16:10:42,170 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-16 16:10:42,170 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-16 16:10:42,170 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_57ae48b7-7ca4-47ad-a8e2-3457df15573e/bin/utaipan-Xvt2sAort0/z3 [2022-11-16 16:10:42,171 INFO L229 MonitoredProcess]: Starting monitored process 6 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_57ae48b7-7ca4-47ad-a8e2-3457df15573e/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-16 16:10:42,183 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_57ae48b7-7ca4-47ad-a8e2-3457df15573e/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2022-11-16 16:10:42,232 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-16 16:10:42,233 INFO L263 TraceCheckSpWp]: Trace formula consists of 106 conjuncts, 17 conjunts are in the unsatisfiable core [2022-11-16 16:10:42,235 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-16 16:10:42,330 INFO L134 CoverageAnalysis]: Checked inductivity of 14 backedges. 1 proven. 1 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2022-11-16 16:10:42,330 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-16 16:10:42,410 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-16 16:10:42,410 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1097464975] [2022-11-16 16:10:42,410 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-11-16 16:10:42,410 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1775581379] [2022-11-16 16:10:42,411 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1775581379] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-16 16:10:42,411 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1062489060] [2022-11-16 16:10:42,414 INFO L159 IcfgInterpreter]: Started Sifa with 22 locations of interest [2022-11-16 16:10:42,415 INFO L166 IcfgInterpreter]: Building call graph [2022-11-16 16:10:42,415 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-16 16:10:42,416 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-16 16:10:42,416 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-16 16:10:42,894 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 38 for LOIs [2022-11-16 16:10:42,904 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 59 for LOIs [2022-11-16 16:10:42,925 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-16 16:10:44,339 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSifa [1062489060] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-16 16:10:44,339 INFO L184 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2022-11-16 16:10:44,339 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [14] imperfect sequences [7] total 20 [2022-11-16 16:10:44,339 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [28290108] [2022-11-16 16:10:44,340 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-16 16:10:44,340 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 15 states [2022-11-16 16:10:44,340 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-16 16:10:44,341 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2022-11-16 16:10:44,341 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=113, Invalid=393, Unknown=0, NotChecked=0, Total=506 [2022-11-16 16:10:44,341 INFO L87 Difference]: Start difference. First operand 50 states and 66 transitions. Second operand has 15 states, 10 states have (on average 1.4) internal successors, (14), 8 states have internal predecessors, (14), 5 states have call successors, (6), 2 states have call predecessors, (6), 2 states have return successors, (5), 5 states have call predecessors, (5), 5 states have call successors, (5) [2022-11-16 16:10:44,846 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-16 16:10:44,846 INFO L93 Difference]: Finished difference Result 72 states and 97 transitions. [2022-11-16 16:10:44,847 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2022-11-16 16:10:44,847 INFO L78 Accepts]: Start accepts. Automaton has has 15 states, 10 states have (on average 1.4) internal successors, (14), 8 states have internal predecessors, (14), 5 states have call successors, (6), 2 states have call predecessors, (6), 2 states have return successors, (5), 5 states have call predecessors, (5), 5 states have call successors, (5) Word has length 29 [2022-11-16 16:10:44,847 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-16 16:10:44,852 INFO L225 Difference]: With dead ends: 72 [2022-11-16 16:10:44,852 INFO L226 Difference]: Without dead ends: 70 [2022-11-16 16:10:44,853 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 62 GetRequests, 38 SyntacticMatches, 3 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 146 ImplicationChecksByTransitivity, 1.5s TimeCoverageRelationStatistics Valid=113, Invalid=393, Unknown=0, NotChecked=0, Total=506 [2022-11-16 16:10:44,854 INFO L413 NwaCegarLoop]: 17 mSDtfsCounter, 103 mSDsluCounter, 40 mSDsCounter, 0 mSdLazyCounter, 222 mSolverCounterSat, 58 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 122 SdHoareTripleChecker+Valid, 57 SdHoareTripleChecker+Invalid, 280 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 58 IncrementalHoareTripleChecker+Valid, 222 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2022-11-16 16:10:44,854 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [122 Valid, 57 Invalid, 280 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [58 Valid, 222 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2022-11-16 16:10:44,855 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 70 states. [2022-11-16 16:10:44,905 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 70 to 65. [2022-11-16 16:10:44,906 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 65 states, 39 states have (on average 1.2307692307692308) internal successors, (48), 41 states have internal predecessors, (48), 21 states have call successors, (21), 4 states have call predecessors, (21), 4 states have return successors, (20), 19 states have call predecessors, (20), 20 states have call successors, (20) [2022-11-16 16:10:44,910 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 65 states to 65 states and 89 transitions. [2022-11-16 16:10:44,911 INFO L78 Accepts]: Start accepts. Automaton has 65 states and 89 transitions. Word has length 29 [2022-11-16 16:10:44,912 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-16 16:10:44,912 INFO L495 AbstractCegarLoop]: Abstraction has 65 states and 89 transitions. [2022-11-16 16:10:44,914 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 15 states, 10 states have (on average 1.4) internal successors, (14), 8 states have internal predecessors, (14), 5 states have call successors, (6), 2 states have call predecessors, (6), 2 states have return successors, (5), 5 states have call predecessors, (5), 5 states have call successors, (5) [2022-11-16 16:10:44,915 INFO L276 IsEmpty]: Start isEmpty. Operand 65 states and 89 transitions. [2022-11-16 16:10:44,915 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 30 [2022-11-16 16:10:44,916 INFO L187 NwaCegarLoop]: Found error trace [2022-11-16 16:10:44,916 INFO L195 NwaCegarLoop]: trace histogram [4, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-16 16:10:44,927 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_57ae48b7-7ca4-47ad-a8e2-3457df15573e/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Forceful destruction successful, exit code 0 [2022-11-16 16:10:45,121 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,6 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_57ae48b7-7ca4-47ad-a8e2-3457df15573e/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-16 16:10:45,122 INFO L420 AbstractCegarLoop]: === Iteration 6 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-16 16:10:45,122 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-16 16:10:45,122 INFO L85 PathProgramCache]: Analyzing trace with hash 187338980, now seen corresponding path program 1 times [2022-11-16 16:10:45,123 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-16 16:10:45,123 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1224972637] [2022-11-16 16:10:45,123 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-16 16:10:45,123 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-16 16:10:45,147 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-11-16 16:10:45,148 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1606160945] [2022-11-16 16:10:45,148 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-16 16:10:45,148 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-16 16:10:45,148 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_57ae48b7-7ca4-47ad-a8e2-3457df15573e/bin/utaipan-Xvt2sAort0/z3 [2022-11-16 16:10:45,161 INFO L229 MonitoredProcess]: Starting monitored process 7 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_57ae48b7-7ca4-47ad-a8e2-3457df15573e/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-16 16:10:45,183 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_57ae48b7-7ca4-47ad-a8e2-3457df15573e/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Waiting until timeout for monitored process [2022-11-16 16:10:45,227 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-16 16:10:45,228 INFO L263 TraceCheckSpWp]: Trace formula consists of 119 conjuncts, 25 conjunts are in the unsatisfiable core [2022-11-16 16:10:45,230 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-16 16:10:45,382 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 3 proven. 4 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2022-11-16 16:10:45,382 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-16 16:10:45,567 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2022-11-16 16:10:45,567 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-16 16:10:45,567 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1224972637] [2022-11-16 16:10:45,567 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-11-16 16:10:45,568 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1606160945] [2022-11-16 16:10:45,568 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1606160945] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-16 16:10:45,568 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [2034109163] [2022-11-16 16:10:45,570 INFO L159 IcfgInterpreter]: Started Sifa with 20 locations of interest [2022-11-16 16:10:45,571 INFO L166 IcfgInterpreter]: Building call graph [2022-11-16 16:10:45,571 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-16 16:10:45,571 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-16 16:10:45,572 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-16 16:10:46,363 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 38 for LOIs [2022-11-16 16:10:46,370 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 59 for LOIs [2022-11-16 16:10:46,388 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-16 16:10:49,109 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSifa [2034109163] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-16 16:10:49,109 INFO L184 FreeRefinementEngine]: Found 1 perfect and 2 imperfect interpolant sequences. [2022-11-16 16:10:49,110 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [15] imperfect sequences [8, 6] total 26 [2022-11-16 16:10:49,110 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1276559483] [2022-11-16 16:10:49,110 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-16 16:10:49,111 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 16 states [2022-11-16 16:10:49,111 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-16 16:10:49,111 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2022-11-16 16:10:49,112 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=125, Invalid=525, Unknown=0, NotChecked=0, Total=650 [2022-11-16 16:10:49,112 INFO L87 Difference]: Start difference. First operand 65 states and 89 transitions. Second operand has 16 states, 11 states have (on average 1.2727272727272727) internal successors, (14), 9 states have internal predecessors, (14), 5 states have call successors, (5), 2 states have call predecessors, (5), 1 states have return successors, (4), 4 states have call predecessors, (4), 4 states have call successors, (4) [2022-11-16 16:10:49,705 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-16 16:10:49,705 INFO L93 Difference]: Finished difference Result 96 states and 128 transitions. [2022-11-16 16:10:49,711 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2022-11-16 16:10:49,711 INFO L78 Accepts]: Start accepts. Automaton has has 16 states, 11 states have (on average 1.2727272727272727) internal successors, (14), 9 states have internal predecessors, (14), 5 states have call successors, (5), 2 states have call predecessors, (5), 1 states have return successors, (4), 4 states have call predecessors, (4), 4 states have call successors, (4) Word has length 29 [2022-11-16 16:10:49,712 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-16 16:10:49,713 INFO L225 Difference]: With dead ends: 96 [2022-11-16 16:10:49,714 INFO L226 Difference]: Without dead ends: 94 [2022-11-16 16:10:49,714 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 85 GetRequests, 59 SyntacticMatches, 2 SemanticMatches, 24 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 163 ImplicationChecksByTransitivity, 2.8s TimeCoverageRelationStatistics Valid=125, Invalid=525, Unknown=0, NotChecked=0, Total=650 [2022-11-16 16:10:49,715 INFO L413 NwaCegarLoop]: 17 mSDtfsCounter, 86 mSDsluCounter, 39 mSDsCounter, 0 mSdLazyCounter, 245 mSolverCounterSat, 46 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 102 SdHoareTripleChecker+Valid, 56 SdHoareTripleChecker+Invalid, 291 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 46 IncrementalHoareTripleChecker+Valid, 245 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2022-11-16 16:10:49,716 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [102 Valid, 56 Invalid, 291 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [46 Valid, 245 Invalid, 0 Unknown, 0 Unchecked, 0.5s Time] [2022-11-16 16:10:49,716 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 94 states. [2022-11-16 16:10:49,779 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 94 to 88. [2022-11-16 16:10:49,780 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 88 states, 51 states have (on average 1.196078431372549) internal successors, (61), 54 states have internal predecessors, (61), 29 states have call successors, (29), 7 states have call predecessors, (29), 7 states have return successors, (28), 26 states have call predecessors, (28), 28 states have call successors, (28) [2022-11-16 16:10:49,781 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 88 states to 88 states and 118 transitions. [2022-11-16 16:10:49,781 INFO L78 Accepts]: Start accepts. Automaton has 88 states and 118 transitions. Word has length 29 [2022-11-16 16:10:49,782 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-16 16:10:49,782 INFO L495 AbstractCegarLoop]: Abstraction has 88 states and 118 transitions. [2022-11-16 16:10:49,782 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 16 states, 11 states have (on average 1.2727272727272727) internal successors, (14), 9 states have internal predecessors, (14), 5 states have call successors, (5), 2 states have call predecessors, (5), 1 states have return successors, (4), 4 states have call predecessors, (4), 4 states have call successors, (4) [2022-11-16 16:10:49,783 INFO L276 IsEmpty]: Start isEmpty. Operand 88 states and 118 transitions. [2022-11-16 16:10:49,784 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 52 [2022-11-16 16:10:49,784 INFO L187 NwaCegarLoop]: Found error trace [2022-11-16 16:10:49,785 INFO L195 NwaCegarLoop]: trace histogram [5, 4, 4, 4, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-16 16:10:49,790 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_57ae48b7-7ca4-47ad-a8e2-3457df15573e/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Forceful destruction successful, exit code 0 [2022-11-16 16:10:49,989 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5,7 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_57ae48b7-7ca4-47ad-a8e2-3457df15573e/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-16 16:10:49,990 INFO L420 AbstractCegarLoop]: === Iteration 7 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-16 16:10:49,990 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-16 16:10:49,991 INFO L85 PathProgramCache]: Analyzing trace with hash -1193022788, now seen corresponding path program 1 times [2022-11-16 16:10:49,991 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-16 16:10:49,991 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [596182409] [2022-11-16 16:10:49,991 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-16 16:10:49,991 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-16 16:10:50,006 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-11-16 16:10:50,006 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [911368200] [2022-11-16 16:10:50,006 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-16 16:10:50,007 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-16 16:10:50,007 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_57ae48b7-7ca4-47ad-a8e2-3457df15573e/bin/utaipan-Xvt2sAort0/z3 [2022-11-16 16:10:50,008 INFO L229 MonitoredProcess]: Starting monitored process 8 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_57ae48b7-7ca4-47ad-a8e2-3457df15573e/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-16 16:10:50,035 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_57ae48b7-7ca4-47ad-a8e2-3457df15573e/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Waiting until timeout for monitored process [2022-11-16 16:10:50,083 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-16 16:10:50,089 INFO L263 TraceCheckSpWp]: Trace formula consists of 157 conjuncts, 65 conjunts are in the unsatisfiable core [2022-11-16 16:10:50,092 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-16 16:10:51,036 INFO L134 CoverageAnalysis]: Checked inductivity of 48 backedges. 8 proven. 19 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2022-11-16 16:10:51,036 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-16 16:10:53,330 INFO L134 CoverageAnalysis]: Checked inductivity of 48 backedges. 8 proven. 16 refuted. 0 times theorem prover too weak. 24 trivial. 0 not checked. [2022-11-16 16:10:53,331 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-16 16:10:53,331 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [596182409] [2022-11-16 16:10:53,331 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-11-16 16:10:53,332 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [911368200] [2022-11-16 16:10:53,332 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [911368200] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-16 16:10:53,332 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1433598185] [2022-11-16 16:10:53,337 INFO L159 IcfgInterpreter]: Started Sifa with 28 locations of interest [2022-11-16 16:10:53,338 INFO L166 IcfgInterpreter]: Building call graph [2022-11-16 16:10:53,338 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-16 16:10:53,338 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-16 16:10:53,339 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-16 16:11:02,429 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 8 for LOIs [2022-11-16 16:11:02,433 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 59 for LOIs [2022-11-16 16:11:02,446 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-16 16:11:16,049 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '2087#(and (= |__VERIFIER_assert_#in~cond| __VERIFIER_assert_~cond) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-16 16:11:16,049 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-16 16:11:16,050 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-11-16 16:11:16,050 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 13] total 26 [2022-11-16 16:11:16,050 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1069437517] [2022-11-16 16:11:16,050 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2022-11-16 16:11:16,051 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 26 states [2022-11-16 16:11:16,051 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-16 16:11:16,051 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2022-11-16 16:11:16,052 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=217, Invalid=1853, Unknown=0, NotChecked=0, Total=2070 [2022-11-16 16:11:16,053 INFO L87 Difference]: Start difference. First operand 88 states and 118 transitions. Second operand has 26 states, 22 states have (on average 1.9545454545454546) internal successors, (43), 21 states have internal predecessors, (43), 9 states have call successors, (15), 3 states have call predecessors, (15), 3 states have return successors, (14), 5 states have call predecessors, (14), 7 states have call successors, (14) [2022-11-16 16:11:35,330 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-16 16:11:35,330 INFO L93 Difference]: Finished difference Result 218 states and 311 transitions. [2022-11-16 16:11:35,330 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 34 states. [2022-11-16 16:11:35,331 INFO L78 Accepts]: Start accepts. Automaton has has 26 states, 22 states have (on average 1.9545454545454546) internal successors, (43), 21 states have internal predecessors, (43), 9 states have call successors, (15), 3 states have call predecessors, (15), 3 states have return successors, (14), 5 states have call predecessors, (14), 7 states have call successors, (14) Word has length 51 [2022-11-16 16:11:35,331 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-16 16:11:35,334 INFO L225 Difference]: With dead ends: 218 [2022-11-16 16:11:35,334 INFO L226 Difference]: Without dead ends: 180 [2022-11-16 16:11:35,336 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 178 GetRequests, 103 SyntacticMatches, 7 SemanticMatches, 68 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1765 ImplicationChecksByTransitivity, 25.9s TimeCoverageRelationStatistics Valid=554, Invalid=4276, Unknown=0, NotChecked=0, Total=4830 [2022-11-16 16:11:35,337 INFO L413 NwaCegarLoop]: 24 mSDtfsCounter, 151 mSDsluCounter, 172 mSDsCounter, 0 mSdLazyCounter, 1274 mSolverCounterSat, 232 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 8.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 165 SdHoareTripleChecker+Valid, 196 SdHoareTripleChecker+Invalid, 1506 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 232 IncrementalHoareTripleChecker+Valid, 1274 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 8.9s IncrementalHoareTripleChecker+Time [2022-11-16 16:11:35,338 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [165 Valid, 196 Invalid, 1506 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [232 Valid, 1274 Invalid, 0 Unknown, 0 Unchecked, 8.9s Time] [2022-11-16 16:11:35,338 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 180 states. [2022-11-16 16:11:35,445 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 180 to 137. [2022-11-16 16:11:35,446 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 137 states, 87 states have (on average 1.2413793103448276) internal successors, (108), 88 states have internal predecessors, (108), 41 states have call successors, (41), 8 states have call predecessors, (41), 8 states have return successors, (40), 40 states have call predecessors, (40), 40 states have call successors, (40) [2022-11-16 16:11:35,447 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 137 states to 137 states and 189 transitions. [2022-11-16 16:11:35,447 INFO L78 Accepts]: Start accepts. Automaton has 137 states and 189 transitions. Word has length 51 [2022-11-16 16:11:35,448 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-16 16:11:35,448 INFO L495 AbstractCegarLoop]: Abstraction has 137 states and 189 transitions. [2022-11-16 16:11:35,448 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 26 states, 22 states have (on average 1.9545454545454546) internal successors, (43), 21 states have internal predecessors, (43), 9 states have call successors, (15), 3 states have call predecessors, (15), 3 states have return successors, (14), 5 states have call predecessors, (14), 7 states have call successors, (14) [2022-11-16 16:11:35,448 INFO L276 IsEmpty]: Start isEmpty. Operand 137 states and 189 transitions. [2022-11-16 16:11:35,450 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 55 [2022-11-16 16:11:35,450 INFO L187 NwaCegarLoop]: Found error trace [2022-11-16 16:11:35,450 INFO L195 NwaCegarLoop]: trace histogram [5, 4, 4, 4, 3, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-16 16:11:35,459 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_57ae48b7-7ca4-47ad-a8e2-3457df15573e/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Ended with exit code 0 [2022-11-16 16:11:35,659 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6,8 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_57ae48b7-7ca4-47ad-a8e2-3457df15573e/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-16 16:11:35,660 INFO L420 AbstractCegarLoop]: === Iteration 8 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-16 16:11:35,661 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-16 16:11:35,661 INFO L85 PathProgramCache]: Analyzing trace with hash -900294476, now seen corresponding path program 1 times [2022-11-16 16:11:35,661 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-16 16:11:35,661 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1203412780] [2022-11-16 16:11:35,661 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-16 16:11:35,661 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-16 16:11:35,686 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-11-16 16:11:35,691 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [419250498] [2022-11-16 16:11:35,693 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-16 16:11:35,693 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-16 16:11:35,693 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_57ae48b7-7ca4-47ad-a8e2-3457df15573e/bin/utaipan-Xvt2sAort0/z3 [2022-11-16 16:11:35,694 INFO L229 MonitoredProcess]: Starting monitored process 9 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_57ae48b7-7ca4-47ad-a8e2-3457df15573e/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-16 16:11:35,699 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_57ae48b7-7ca4-47ad-a8e2-3457df15573e/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Waiting until timeout for monitored process [2022-11-16 16:11:35,757 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-16 16:11:35,758 INFO L263 TraceCheckSpWp]: Trace formula consists of 167 conjuncts, 4 conjunts are in the unsatisfiable core [2022-11-16 16:11:35,760 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-16 16:11:35,793 INFO L134 CoverageAnalysis]: Checked inductivity of 54 backedges. 14 proven. 0 refuted. 0 times theorem prover too weak. 40 trivial. 0 not checked. [2022-11-16 16:11:35,793 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2022-11-16 16:11:35,793 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-16 16:11:35,794 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1203412780] [2022-11-16 16:11:35,794 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-11-16 16:11:35,794 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [419250498] [2022-11-16 16:11:35,794 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [419250498] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-16 16:11:35,794 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-11-16 16:11:35,794 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2022-11-16 16:11:35,795 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1149543318] [2022-11-16 16:11:35,795 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-16 16:11:35,795 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2022-11-16 16:11:35,795 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-16 16:11:35,796 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2022-11-16 16:11:35,796 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2022-11-16 16:11:35,796 INFO L87 Difference]: Start difference. First operand 137 states and 189 transitions. Second operand has 5 states, 5 states have (on average 4.4) internal successors, (22), 5 states have internal predecessors, (22), 3 states have call successors, (9), 2 states have call predecessors, (9), 1 states have return successors, (8), 2 states have call predecessors, (8), 2 states have call successors, (8) [2022-11-16 16:11:35,992 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-16 16:11:35,993 INFO L93 Difference]: Finished difference Result 229 states and 321 transitions. [2022-11-16 16:11:35,993 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2022-11-16 16:11:35,993 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 4.4) internal successors, (22), 5 states have internal predecessors, (22), 3 states have call successors, (9), 2 states have call predecessors, (9), 1 states have return successors, (8), 2 states have call predecessors, (8), 2 states have call successors, (8) Word has length 54 [2022-11-16 16:11:35,994 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-16 16:11:35,995 INFO L225 Difference]: With dead ends: 229 [2022-11-16 16:11:35,995 INFO L226 Difference]: Without dead ends: 166 [2022-11-16 16:11:35,996 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 55 GetRequests, 51 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=12, Invalid=18, Unknown=0, NotChecked=0, Total=30 [2022-11-16 16:11:35,997 INFO L413 NwaCegarLoop]: 36 mSDtfsCounter, 4 mSDsluCounter, 48 mSDsCounter, 0 mSdLazyCounter, 47 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 4 SdHoareTripleChecker+Valid, 84 SdHoareTripleChecker+Invalid, 48 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 47 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-11-16 16:11:35,997 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [4 Valid, 84 Invalid, 48 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 47 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-11-16 16:11:35,998 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 166 states. [2022-11-16 16:11:36,088 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 166 to 155. [2022-11-16 16:11:36,088 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 155 states, 93 states have (on average 1.2365591397849462) internal successors, (115), 94 states have internal predecessors, (115), 53 states have call successors, (53), 8 states have call predecessors, (53), 8 states have return successors, (52), 52 states have call predecessors, (52), 52 states have call successors, (52) [2022-11-16 16:11:36,090 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 155 states to 155 states and 220 transitions. [2022-11-16 16:11:36,090 INFO L78 Accepts]: Start accepts. Automaton has 155 states and 220 transitions. Word has length 54 [2022-11-16 16:11:36,091 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-16 16:11:36,091 INFO L495 AbstractCegarLoop]: Abstraction has 155 states and 220 transitions. [2022-11-16 16:11:36,091 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 4.4) internal successors, (22), 5 states have internal predecessors, (22), 3 states have call successors, (9), 2 states have call predecessors, (9), 1 states have return successors, (8), 2 states have call predecessors, (8), 2 states have call successors, (8) [2022-11-16 16:11:36,091 INFO L276 IsEmpty]: Start isEmpty. Operand 155 states and 220 transitions. [2022-11-16 16:11:36,092 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 62 [2022-11-16 16:11:36,092 INFO L187 NwaCegarLoop]: Found error trace [2022-11-16 16:11:36,092 INFO L195 NwaCegarLoop]: trace histogram [8, 7, 7, 4, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-16 16:11:36,099 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_57ae48b7-7ca4-47ad-a8e2-3457df15573e/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Forceful destruction successful, exit code 0 [2022-11-16 16:11:36,298 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7,9 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_57ae48b7-7ca4-47ad-a8e2-3457df15573e/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-16 16:11:36,298 INFO L420 AbstractCegarLoop]: === Iteration 9 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-16 16:11:36,299 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-16 16:11:36,299 INFO L85 PathProgramCache]: Analyzing trace with hash 1047855047, now seen corresponding path program 1 times [2022-11-16 16:11:36,299 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-16 16:11:36,299 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1600167650] [2022-11-16 16:11:36,299 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-16 16:11:36,300 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-16 16:11:36,311 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-11-16 16:11:36,312 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1930611026] [2022-11-16 16:11:36,312 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-16 16:11:36,312 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-16 16:11:36,312 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_57ae48b7-7ca4-47ad-a8e2-3457df15573e/bin/utaipan-Xvt2sAort0/z3 [2022-11-16 16:11:36,313 INFO L229 MonitoredProcess]: Starting monitored process 10 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_57ae48b7-7ca4-47ad-a8e2-3457df15573e/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-16 16:11:36,339 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_57ae48b7-7ca4-47ad-a8e2-3457df15573e/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Waiting until timeout for monitored process [2022-11-16 16:11:36,383 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-16 16:11:36,384 INFO L263 TraceCheckSpWp]: Trace formula consists of 166 conjuncts, 29 conjunts are in the unsatisfiable core [2022-11-16 16:11:36,386 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-16 16:11:36,560 INFO L134 CoverageAnalysis]: Checked inductivity of 115 backedges. 25 proven. 15 refuted. 0 times theorem prover too weak. 75 trivial. 0 not checked. [2022-11-16 16:11:36,560 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-16 16:11:36,698 INFO L134 CoverageAnalysis]: Checked inductivity of 115 backedges. 27 proven. 10 refuted. 0 times theorem prover too weak. 78 trivial. 0 not checked. [2022-11-16 16:11:36,698 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-16 16:11:36,699 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1600167650] [2022-11-16 16:11:36,699 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-11-16 16:11:36,699 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1930611026] [2022-11-16 16:11:36,699 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1930611026] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-16 16:11:36,699 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [148863262] [2022-11-16 16:11:36,701 INFO L159 IcfgInterpreter]: Started Sifa with 25 locations of interest [2022-11-16 16:11:36,702 INFO L166 IcfgInterpreter]: Building call graph [2022-11-16 16:11:36,702 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-16 16:11:36,703 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-16 16:11:36,703 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-16 16:11:43,196 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 8 for LOIs [2022-11-16 16:11:43,201 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 59 for LOIs [2022-11-16 16:11:43,214 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-16 16:11:45,265 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '3853#(and (= |__VERIFIER_assert_#in~cond| __VERIFIER_assert_~cond) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-16 16:11:45,265 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-16 16:11:45,265 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-11-16 16:11:45,265 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 6] total 14 [2022-11-16 16:11:45,266 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [622046316] [2022-11-16 16:11:45,266 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2022-11-16 16:11:45,266 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 14 states [2022-11-16 16:11:45,266 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-16 16:11:45,267 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2022-11-16 16:11:45,267 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=129, Invalid=741, Unknown=0, NotChecked=0, Total=870 [2022-11-16 16:11:45,267 INFO L87 Difference]: Start difference. First operand 155 states and 220 transitions. Second operand has 14 states, 13 states have (on average 2.5384615384615383) internal successors, (33), 12 states have internal predecessors, (33), 4 states have call successors, (20), 3 states have call predecessors, (20), 3 states have return successors, (19), 5 states have call predecessors, (19), 4 states have call successors, (19) [2022-11-16 16:11:45,883 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-16 16:11:45,884 INFO L93 Difference]: Finished difference Result 198 states and 272 transitions. [2022-11-16 16:11:45,884 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2022-11-16 16:11:45,884 INFO L78 Accepts]: Start accepts. Automaton has has 14 states, 13 states have (on average 2.5384615384615383) internal successors, (33), 12 states have internal predecessors, (33), 4 states have call successors, (20), 3 states have call predecessors, (20), 3 states have return successors, (19), 5 states have call predecessors, (19), 4 states have call successors, (19) Word has length 61 [2022-11-16 16:11:45,885 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-16 16:11:45,886 INFO L225 Difference]: With dead ends: 198 [2022-11-16 16:11:45,886 INFO L226 Difference]: Without dead ends: 196 [2022-11-16 16:11:45,887 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 193 GetRequests, 148 SyntacticMatches, 10 SemanticMatches, 35 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 562 ImplicationChecksByTransitivity, 2.2s TimeCoverageRelationStatistics Valid=180, Invalid=1152, Unknown=0, NotChecked=0, Total=1332 [2022-11-16 16:11:45,888 INFO L413 NwaCegarLoop]: 25 mSDtfsCounter, 65 mSDsluCounter, 86 mSDsCounter, 0 mSdLazyCounter, 355 mSolverCounterSat, 35 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 65 SdHoareTripleChecker+Valid, 111 SdHoareTripleChecker+Invalid, 390 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 35 IncrementalHoareTripleChecker+Valid, 355 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2022-11-16 16:11:45,888 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [65 Valid, 111 Invalid, 390 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [35 Valid, 355 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2022-11-16 16:11:45,889 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 196 states. [2022-11-16 16:11:45,986 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 196 to 167. [2022-11-16 16:11:45,987 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 167 states, 102 states have (on average 1.2156862745098038) internal successors, (124), 103 states have internal predecessors, (124), 53 states have call successors, (53), 11 states have call predecessors, (53), 11 states have return successors, (52), 52 states have call predecessors, (52), 52 states have call successors, (52) [2022-11-16 16:11:45,988 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 167 states to 167 states and 229 transitions. [2022-11-16 16:11:45,989 INFO L78 Accepts]: Start accepts. Automaton has 167 states and 229 transitions. Word has length 61 [2022-11-16 16:11:45,989 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-16 16:11:45,989 INFO L495 AbstractCegarLoop]: Abstraction has 167 states and 229 transitions. [2022-11-16 16:11:45,989 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 14 states, 13 states have (on average 2.5384615384615383) internal successors, (33), 12 states have internal predecessors, (33), 4 states have call successors, (20), 3 states have call predecessors, (20), 3 states have return successors, (19), 5 states have call predecessors, (19), 4 states have call successors, (19) [2022-11-16 16:11:45,990 INFO L276 IsEmpty]: Start isEmpty. Operand 167 states and 229 transitions. [2022-11-16 16:11:45,991 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 60 [2022-11-16 16:11:45,991 INFO L187 NwaCegarLoop]: Found error trace [2022-11-16 16:11:45,991 INFO L195 NwaCegarLoop]: trace histogram [5, 4, 4, 4, 4, 3, 3, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-16 16:11:45,997 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_57ae48b7-7ca4-47ad-a8e2-3457df15573e/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Forceful destruction successful, exit code 0 [2022-11-16 16:11:46,197 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8,10 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_57ae48b7-7ca4-47ad-a8e2-3457df15573e/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-16 16:11:46,197 INFO L420 AbstractCegarLoop]: === Iteration 10 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-16 16:11:46,198 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-16 16:11:46,198 INFO L85 PathProgramCache]: Analyzing trace with hash -94425734, now seen corresponding path program 2 times [2022-11-16 16:11:46,198 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-16 16:11:46,198 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1879340215] [2022-11-16 16:11:46,198 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-16 16:11:46,198 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-16 16:11:46,215 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-11-16 16:11:46,216 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [240087684] [2022-11-16 16:11:46,216 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-11-16 16:11:46,216 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-16 16:11:46,216 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_57ae48b7-7ca4-47ad-a8e2-3457df15573e/bin/utaipan-Xvt2sAort0/z3 [2022-11-16 16:11:46,223 INFO L229 MonitoredProcess]: Starting monitored process 11 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_57ae48b7-7ca4-47ad-a8e2-3457df15573e/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-16 16:11:46,262 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_57ae48b7-7ca4-47ad-a8e2-3457df15573e/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Waiting until timeout for monitored process [2022-11-16 16:11:46,307 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2022-11-16 16:11:46,307 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-16 16:11:46,309 INFO L263 TraceCheckSpWp]: Trace formula consists of 154 conjuncts, 55 conjunts are in the unsatisfiable core [2022-11-16 16:11:46,312 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-16 16:11:46,903 INFO L134 CoverageAnalysis]: Checked inductivity of 65 backedges. 11 proven. 21 refuted. 0 times theorem prover too weak. 33 trivial. 0 not checked. [2022-11-16 16:11:46,903 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-16 16:11:47,430 INFO L134 CoverageAnalysis]: Checked inductivity of 65 backedges. 10 proven. 19 refuted. 0 times theorem prover too weak. 36 trivial. 0 not checked. [2022-11-16 16:11:47,430 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-16 16:11:47,430 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1879340215] [2022-11-16 16:11:47,430 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-11-16 16:11:47,430 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [240087684] [2022-11-16 16:11:47,431 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [240087684] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-16 16:11:47,431 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1878315465] [2022-11-16 16:11:47,434 INFO L159 IcfgInterpreter]: Started Sifa with 27 locations of interest [2022-11-16 16:11:47,435 INFO L166 IcfgInterpreter]: Building call graph [2022-11-16 16:11:47,435 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-16 16:11:47,435 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-16 16:11:47,435 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-16 16:11:54,040 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 50 for LOIs [2022-11-16 16:11:54,113 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 59 for LOIs [2022-11-16 16:11:54,126 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-16 16:11:59,382 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '4824#(and (<= |#NULL.offset| 0) (= |__VERIFIER_assert_#in~cond| __VERIFIER_assert_~cond) (= __VERIFIER_assert_~cond 0) (<= 0 |#NULL.offset|) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-16 16:11:59,382 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-16 16:11:59,382 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-11-16 16:11:59,382 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 13] total 26 [2022-11-16 16:11:59,383 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [525851284] [2022-11-16 16:11:59,383 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2022-11-16 16:11:59,383 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 26 states [2022-11-16 16:11:59,384 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-16 16:11:59,384 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2022-11-16 16:11:59,385 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=231, Invalid=1749, Unknown=0, NotChecked=0, Total=1980 [2022-11-16 16:11:59,385 INFO L87 Difference]: Start difference. First operand 167 states and 229 transitions. Second operand has 26 states, 25 states have (on average 2.16) internal successors, (54), 23 states have internal predecessors, (54), 5 states have call successors, (14), 3 states have call predecessors, (14), 2 states have return successors, (13), 4 states have call predecessors, (13), 3 states have call successors, (13) [2022-11-16 16:12:24,395 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-16 16:12:24,395 INFO L93 Difference]: Finished difference Result 446 states and 634 transitions. [2022-11-16 16:12:24,396 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 40 states. [2022-11-16 16:12:24,396 INFO L78 Accepts]: Start accepts. Automaton has has 26 states, 25 states have (on average 2.16) internal successors, (54), 23 states have internal predecessors, (54), 5 states have call successors, (14), 3 states have call predecessors, (14), 2 states have return successors, (13), 4 states have call predecessors, (13), 3 states have call successors, (13) Word has length 59 [2022-11-16 16:12:24,396 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-16 16:12:24,399 INFO L225 Difference]: With dead ends: 446 [2022-11-16 16:12:24,399 INFO L226 Difference]: Without dead ends: 375 [2022-11-16 16:12:24,401 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 207 GetRequests, 126 SyntacticMatches, 6 SemanticMatches, 75 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2117 ImplicationChecksByTransitivity, 18.9s TimeCoverageRelationStatistics Valid=776, Invalid=5076, Unknown=0, NotChecked=0, Total=5852 [2022-11-16 16:12:24,402 INFO L413 NwaCegarLoop]: 72 mSDtfsCounter, 271 mSDsluCounter, 300 mSDsCounter, 0 mSdLazyCounter, 1136 mSolverCounterSat, 320 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 11.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 271 SdHoareTripleChecker+Valid, 372 SdHoareTripleChecker+Invalid, 1456 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 320 IncrementalHoareTripleChecker+Valid, 1136 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 11.5s IncrementalHoareTripleChecker+Time [2022-11-16 16:12:24,403 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [271 Valid, 372 Invalid, 1456 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [320 Valid, 1136 Invalid, 0 Unknown, 0 Unchecked, 11.5s Time] [2022-11-16 16:12:24,403 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 375 states. [2022-11-16 16:12:24,587 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 375 to 244. [2022-11-16 16:12:24,588 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 244 states, 153 states have (on average 1.2287581699346406) internal successors, (188), 154 states have internal predecessors, (188), 77 states have call successors, (77), 13 states have call predecessors, (77), 13 states have return successors, (76), 76 states have call predecessors, (76), 76 states have call successors, (76) [2022-11-16 16:12:24,590 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 244 states to 244 states and 341 transitions. [2022-11-16 16:12:24,590 INFO L78 Accepts]: Start accepts. Automaton has 244 states and 341 transitions. Word has length 59 [2022-11-16 16:12:24,590 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-16 16:12:24,591 INFO L495 AbstractCegarLoop]: Abstraction has 244 states and 341 transitions. [2022-11-16 16:12:24,591 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 26 states, 25 states have (on average 2.16) internal successors, (54), 23 states have internal predecessors, (54), 5 states have call successors, (14), 3 states have call predecessors, (14), 2 states have return successors, (13), 4 states have call predecessors, (13), 3 states have call successors, (13) [2022-11-16 16:12:24,591 INFO L276 IsEmpty]: Start isEmpty. Operand 244 states and 341 transitions. [2022-11-16 16:12:24,592 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 60 [2022-11-16 16:12:24,592 INFO L187 NwaCegarLoop]: Found error trace [2022-11-16 16:12:24,592 INFO L195 NwaCegarLoop]: trace histogram [5, 4, 4, 4, 4, 3, 3, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-16 16:12:24,607 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_57ae48b7-7ca4-47ad-a8e2-3457df15573e/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Forceful destruction successful, exit code 0 [2022-11-16 16:12:24,802 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 11 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_57ae48b7-7ca4-47ad-a8e2-3457df15573e/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable9 [2022-11-16 16:12:24,803 INFO L420 AbstractCegarLoop]: === Iteration 11 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-16 16:12:24,803 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-16 16:12:24,803 INFO L85 PathProgramCache]: Analyzing trace with hash -1223812978, now seen corresponding path program 3 times [2022-11-16 16:12:24,803 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-16 16:12:24,803 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [944284311] [2022-11-16 16:12:24,804 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-16 16:12:24,804 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-16 16:12:24,814 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-11-16 16:12:24,814 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [719503230] [2022-11-16 16:12:24,814 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-11-16 16:12:24,814 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-16 16:12:24,814 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_57ae48b7-7ca4-47ad-a8e2-3457df15573e/bin/utaipan-Xvt2sAort0/z3 [2022-11-16 16:12:24,817 INFO L229 MonitoredProcess]: Starting monitored process 12 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_57ae48b7-7ca4-47ad-a8e2-3457df15573e/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-16 16:12:24,826 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_57ae48b7-7ca4-47ad-a8e2-3457df15573e/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Waiting until timeout for monitored process [2022-11-16 16:12:24,872 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-11-16 16:12:24,872 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-16 16:12:24,873 INFO L263 TraceCheckSpWp]: Trace formula consists of 160 conjuncts, 7 conjunts are in the unsatisfiable core [2022-11-16 16:12:24,875 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-16 16:12:24,934 INFO L134 CoverageAnalysis]: Checked inductivity of 65 backedges. 27 proven. 2 refuted. 0 times theorem prover too weak. 36 trivial. 0 not checked. [2022-11-16 16:12:24,934 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-16 16:12:25,014 INFO L134 CoverageAnalysis]: Checked inductivity of 65 backedges. 27 proven. 2 refuted. 0 times theorem prover too weak. 36 trivial. 0 not checked. [2022-11-16 16:12:25,014 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-16 16:12:25,014 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [944284311] [2022-11-16 16:12:25,014 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-11-16 16:12:25,014 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [719503230] [2022-11-16 16:12:25,014 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [719503230] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-16 16:12:25,014 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [704973661] [2022-11-16 16:12:25,017 INFO L159 IcfgInterpreter]: Started Sifa with 27 locations of interest [2022-11-16 16:12:25,017 INFO L166 IcfgInterpreter]: Building call graph [2022-11-16 16:12:25,017 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-16 16:12:25,018 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-16 16:12:25,018 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-16 16:12:31,679 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 50 for LOIs [2022-11-16 16:12:31,738 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 59 for LOIs [2022-11-16 16:12:31,752 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-16 16:12:34,479 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '6343#(and (= |__VERIFIER_assert_#in~cond| __VERIFIER_assert_~cond) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-16 16:12:34,479 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-16 16:12:34,479 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-11-16 16:12:34,480 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7] total 12 [2022-11-16 16:12:34,480 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2111597556] [2022-11-16 16:12:34,480 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2022-11-16 16:12:34,480 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 12 states [2022-11-16 16:12:34,480 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-16 16:12:34,481 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2022-11-16 16:12:34,481 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=132, Invalid=798, Unknown=0, NotChecked=0, Total=930 [2022-11-16 16:12:34,481 INFO L87 Difference]: Start difference. First operand 244 states and 341 transitions. Second operand has 12 states, 12 states have (on average 3.4166666666666665) internal successors, (41), 12 states have internal predecessors, (41), 4 states have call successors, (13), 2 states have call predecessors, (13), 1 states have return successors, (12), 3 states have call predecessors, (12), 3 states have call successors, (12) [2022-11-16 16:12:35,148 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-16 16:12:35,148 INFO L93 Difference]: Finished difference Result 353 states and 497 transitions. [2022-11-16 16:12:35,148 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2022-11-16 16:12:35,149 INFO L78 Accepts]: Start accepts. Automaton has has 12 states, 12 states have (on average 3.4166666666666665) internal successors, (41), 12 states have internal predecessors, (41), 4 states have call successors, (13), 2 states have call predecessors, (13), 1 states have return successors, (12), 3 states have call predecessors, (12), 3 states have call successors, (12) Word has length 59 [2022-11-16 16:12:35,149 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-16 16:12:35,151 INFO L225 Difference]: With dead ends: 353 [2022-11-16 16:12:35,151 INFO L226 Difference]: Without dead ends: 255 [2022-11-16 16:12:35,152 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 191 GetRequests, 144 SyntacticMatches, 6 SemanticMatches, 41 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 640 ImplicationChecksByTransitivity, 2.9s TimeCoverageRelationStatistics Valid=244, Invalid=1562, Unknown=0, NotChecked=0, Total=1806 [2022-11-16 16:12:35,153 INFO L413 NwaCegarLoop]: 59 mSDtfsCounter, 46 mSDsluCounter, 162 mSDsCounter, 0 mSdLazyCounter, 346 mSolverCounterSat, 49 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 50 SdHoareTripleChecker+Valid, 221 SdHoareTripleChecker+Invalid, 395 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 49 IncrementalHoareTripleChecker+Valid, 346 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2022-11-16 16:12:35,153 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [50 Valid, 221 Invalid, 395 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [49 Valid, 346 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2022-11-16 16:12:35,154 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 255 states. [2022-11-16 16:12:35,328 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 255 to 225. [2022-11-16 16:12:35,329 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 225 states, 138 states have (on average 1.1956521739130435) internal successors, (165), 139 states have internal predecessors, (165), 73 states have call successors, (73), 13 states have call predecessors, (73), 13 states have return successors, (72), 72 states have call predecessors, (72), 72 states have call successors, (72) [2022-11-16 16:12:35,331 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 225 states to 225 states and 310 transitions. [2022-11-16 16:12:35,331 INFO L78 Accepts]: Start accepts. Automaton has 225 states and 310 transitions. Word has length 59 [2022-11-16 16:12:35,332 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-16 16:12:35,332 INFO L495 AbstractCegarLoop]: Abstraction has 225 states and 310 transitions. [2022-11-16 16:12:35,332 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 12 states, 12 states have (on average 3.4166666666666665) internal successors, (41), 12 states have internal predecessors, (41), 4 states have call successors, (13), 2 states have call predecessors, (13), 1 states have return successors, (12), 3 states have call predecessors, (12), 3 states have call successors, (12) [2022-11-16 16:12:35,332 INFO L276 IsEmpty]: Start isEmpty. Operand 225 states and 310 transitions. [2022-11-16 16:12:35,333 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 65 [2022-11-16 16:12:35,334 INFO L187 NwaCegarLoop]: Found error trace [2022-11-16 16:12:35,334 INFO L195 NwaCegarLoop]: trace histogram [7, 6, 6, 4, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-16 16:12:35,340 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_57ae48b7-7ca4-47ad-a8e2-3457df15573e/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Forceful destruction successful, exit code 0 [2022-11-16 16:12:35,540 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable10,12 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_57ae48b7-7ca4-47ad-a8e2-3457df15573e/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-16 16:12:35,540 INFO L420 AbstractCegarLoop]: === Iteration 12 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-16 16:12:35,540 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-16 16:12:35,540 INFO L85 PathProgramCache]: Analyzing trace with hash 255729376, now seen corresponding path program 4 times [2022-11-16 16:12:35,540 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-16 16:12:35,540 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1619471846] [2022-11-16 16:12:35,541 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-16 16:12:35,541 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-16 16:12:35,548 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-11-16 16:12:35,548 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [783397539] [2022-11-16 16:12:35,549 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-11-16 16:12:35,549 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-16 16:12:35,549 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_57ae48b7-7ca4-47ad-a8e2-3457df15573e/bin/utaipan-Xvt2sAort0/z3 [2022-11-16 16:12:35,550 INFO L229 MonitoredProcess]: Starting monitored process 13 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_57ae48b7-7ca4-47ad-a8e2-3457df15573e/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-16 16:12:35,571 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_57ae48b7-7ca4-47ad-a8e2-3457df15573e/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Waiting until timeout for monitored process [2022-11-16 16:12:35,615 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-16 16:12:35,617 INFO L263 TraceCheckSpWp]: Trace formula consists of 185 conjuncts, 23 conjunts are in the unsatisfiable core [2022-11-16 16:12:35,619 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-16 16:12:35,746 INFO L134 CoverageAnalysis]: Checked inductivity of 96 backedges. 20 proven. 7 refuted. 0 times theorem prover too weak. 69 trivial. 0 not checked. [2022-11-16 16:12:35,746 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-16 16:12:35,829 INFO L134 CoverageAnalysis]: Checked inductivity of 96 backedges. 20 proven. 0 refuted. 0 times theorem prover too weak. 76 trivial. 0 not checked. [2022-11-16 16:12:35,829 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-16 16:12:35,829 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1619471846] [2022-11-16 16:12:35,830 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-11-16 16:12:35,830 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [783397539] [2022-11-16 16:12:35,830 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [783397539] provided 1 perfect and 1 imperfect interpolant sequences [2022-11-16 16:12:35,830 INFO L184 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2022-11-16 16:12:35,830 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [11] total 14 [2022-11-16 16:12:35,830 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [859757661] [2022-11-16 16:12:35,830 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-16 16:12:35,831 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2022-11-16 16:12:35,831 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-16 16:12:35,831 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2022-11-16 16:12:35,831 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=31, Invalid=151, Unknown=0, NotChecked=0, Total=182 [2022-11-16 16:12:35,831 INFO L87 Difference]: Start difference. First operand 225 states and 310 transitions. Second operand has 5 states, 5 states have (on average 4.6) internal successors, (23), 4 states have internal predecessors, (23), 2 states have call successors, (11), 2 states have call predecessors, (11), 1 states have return successors, (10), 2 states have call predecessors, (10), 2 states have call successors, (10) [2022-11-16 16:12:36,069 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-16 16:12:36,069 INFO L93 Difference]: Finished difference Result 261 states and 358 transitions. [2022-11-16 16:12:36,069 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2022-11-16 16:12:36,070 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 4.6) internal successors, (23), 4 states have internal predecessors, (23), 2 states have call successors, (11), 2 states have call predecessors, (11), 1 states have return successors, (10), 2 states have call predecessors, (10), 2 states have call successors, (10) Word has length 64 [2022-11-16 16:12:36,070 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-16 16:12:36,071 INFO L225 Difference]: With dead ends: 261 [2022-11-16 16:12:36,072 INFO L226 Difference]: Without dead ends: 259 [2022-11-16 16:12:36,072 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 127 GetRequests, 114 SyntacticMatches, 0 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 25 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=35, Invalid=175, Unknown=0, NotChecked=0, Total=210 [2022-11-16 16:12:36,073 INFO L413 NwaCegarLoop]: 33 mSDtfsCounter, 7 mSDsluCounter, 72 mSDsCounter, 0 mSdLazyCounter, 58 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 9 SdHoareTripleChecker+Valid, 105 SdHoareTripleChecker+Invalid, 59 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 58 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-11-16 16:12:36,073 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [9 Valid, 105 Invalid, 59 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 58 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-11-16 16:12:36,074 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 259 states. [2022-11-16 16:12:36,247 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 259 to 255. [2022-11-16 16:12:36,247 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 255 states, 153 states have (on average 1.196078431372549) internal successors, (183), 154 states have internal predecessors, (183), 85 states have call successors, (85), 16 states have call predecessors, (85), 16 states have return successors, (84), 84 states have call predecessors, (84), 84 states have call successors, (84) [2022-11-16 16:12:36,249 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 255 states to 255 states and 352 transitions. [2022-11-16 16:12:36,249 INFO L78 Accepts]: Start accepts. Automaton has 255 states and 352 transitions. Word has length 64 [2022-11-16 16:12:36,250 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-16 16:12:36,250 INFO L495 AbstractCegarLoop]: Abstraction has 255 states and 352 transitions. [2022-11-16 16:12:36,250 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 4.6) internal successors, (23), 4 states have internal predecessors, (23), 2 states have call successors, (11), 2 states have call predecessors, (11), 1 states have return successors, (10), 2 states have call predecessors, (10), 2 states have call successors, (10) [2022-11-16 16:12:36,250 INFO L276 IsEmpty]: Start isEmpty. Operand 255 states and 352 transitions. [2022-11-16 16:12:36,251 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 65 [2022-11-16 16:12:36,251 INFO L187 NwaCegarLoop]: Found error trace [2022-11-16 16:12:36,251 INFO L195 NwaCegarLoop]: trace histogram [6, 5, 5, 4, 4, 3, 3, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-16 16:12:36,256 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_57ae48b7-7ca4-47ad-a8e2-3457df15573e/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Forceful destruction successful, exit code 0 [2022-11-16 16:12:36,451 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 13 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_57ae48b7-7ca4-47ad-a8e2-3457df15573e/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable11 [2022-11-16 16:12:36,452 INFO L420 AbstractCegarLoop]: === Iteration 13 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-16 16:12:36,452 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-16 16:12:36,452 INFO L85 PathProgramCache]: Analyzing trace with hash 1508724982, now seen corresponding path program 5 times [2022-11-16 16:12:36,452 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-16 16:12:36,452 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1811378661] [2022-11-16 16:12:36,452 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-16 16:12:36,453 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-16 16:12:36,462 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-11-16 16:12:36,463 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [654271664] [2022-11-16 16:12:36,463 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-11-16 16:12:36,463 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-16 16:12:36,463 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_57ae48b7-7ca4-47ad-a8e2-3457df15573e/bin/utaipan-Xvt2sAort0/z3 [2022-11-16 16:12:36,464 INFO L229 MonitoredProcess]: Starting monitored process 14 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_57ae48b7-7ca4-47ad-a8e2-3457df15573e/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-16 16:12:36,495 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_57ae48b7-7ca4-47ad-a8e2-3457df15573e/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (14)] Waiting until timeout for monitored process [2022-11-16 16:12:36,557 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2022-11-16 16:12:36,557 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-16 16:12:36,559 INFO L263 TraceCheckSpWp]: Trace formula consists of 163 conjuncts, 65 conjunts are in the unsatisfiable core [2022-11-16 16:12:36,561 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-16 16:12:37,333 INFO L134 CoverageAnalysis]: Checked inductivity of 84 backedges. 13 proven. 22 refuted. 0 times theorem prover too weak. 49 trivial. 0 not checked. [2022-11-16 16:12:37,333 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-16 16:12:38,619 INFO L134 CoverageAnalysis]: Checked inductivity of 84 backedges. 14 proven. 18 refuted. 0 times theorem prover too weak. 52 trivial. 0 not checked. [2022-11-16 16:12:38,620 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-16 16:12:38,620 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1811378661] [2022-11-16 16:12:38,620 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-11-16 16:12:38,620 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [654271664] [2022-11-16 16:12:38,620 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [654271664] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-16 16:12:38,620 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1157673737] [2022-11-16 16:12:38,622 INFO L159 IcfgInterpreter]: Started Sifa with 27 locations of interest [2022-11-16 16:12:38,623 INFO L166 IcfgInterpreter]: Building call graph [2022-11-16 16:12:38,623 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-16 16:12:38,623 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-16 16:12:38,623 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-16 16:12:47,003 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 8 for LOIs [2022-11-16 16:12:47,007 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 59 for LOIs [2022-11-16 16:12:47,032 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-16 16:12:54,135 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '8892#(and (= |__VERIFIER_assert_#in~cond| __VERIFIER_assert_~cond) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-16 16:12:54,135 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-16 16:12:54,135 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-11-16 16:12:54,136 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 13] total 26 [2022-11-16 16:12:54,136 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [379431643] [2022-11-16 16:12:54,136 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2022-11-16 16:12:54,136 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 26 states [2022-11-16 16:12:54,136 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-16 16:12:54,137 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2022-11-16 16:12:54,138 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=212, Invalid=1768, Unknown=0, NotChecked=0, Total=1980 [2022-11-16 16:12:54,138 INFO L87 Difference]: Start difference. First operand 255 states and 352 transitions. Second operand has 26 states, 25 states have (on average 2.16) internal successors, (54), 23 states have internal predecessors, (54), 5 states have call successors, (16), 3 states have call predecessors, (16), 2 states have return successors, (15), 6 states have call predecessors, (15), 5 states have call successors, (15) [2022-11-16 16:13:22,286 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-16 16:13:22,286 INFO L93 Difference]: Finished difference Result 395 states and 560 transitions. [2022-11-16 16:13:22,286 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 34 states. [2022-11-16 16:13:22,286 INFO L78 Accepts]: Start accepts. Automaton has has 26 states, 25 states have (on average 2.16) internal successors, (54), 23 states have internal predecessors, (54), 5 states have call successors, (16), 3 states have call predecessors, (16), 2 states have return successors, (15), 6 states have call predecessors, (15), 5 states have call successors, (15) Word has length 64 [2022-11-16 16:13:22,287 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-16 16:13:22,289 INFO L225 Difference]: With dead ends: 395 [2022-11-16 16:13:22,289 INFO L226 Difference]: Without dead ends: 393 [2022-11-16 16:13:22,291 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 216 GetRequests, 147 SyntacticMatches, 0 SemanticMatches, 69 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1489 ImplicationChecksByTransitivity, 23.0s TimeCoverageRelationStatistics Valid=654, Invalid=4316, Unknown=0, NotChecked=0, Total=4970 [2022-11-16 16:13:22,291 INFO L413 NwaCegarLoop]: 62 mSDtfsCounter, 233 mSDsluCounter, 314 mSDsCounter, 0 mSdLazyCounter, 1186 mSolverCounterSat, 376 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 12.8s Time, 0 mProtectedPredicate, 0 mProtectedAction, 233 SdHoareTripleChecker+Valid, 376 SdHoareTripleChecker+Invalid, 1562 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 376 IncrementalHoareTripleChecker+Valid, 1186 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 13.0s IncrementalHoareTripleChecker+Time [2022-11-16 16:13:22,292 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [233 Valid, 376 Invalid, 1562 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [376 Valid, 1186 Invalid, 0 Unknown, 0 Unchecked, 13.0s Time] [2022-11-16 16:13:22,292 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 393 states. [2022-11-16 16:13:22,649 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 393 to 342. [2022-11-16 16:13:22,650 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 342 states, 202 states have (on average 1.2128712871287128) internal successors, (245), 203 states have internal predecessors, (245), 121 states have call successors, (121), 18 states have call predecessors, (121), 18 states have return successors, (120), 120 states have call predecessors, (120), 120 states have call successors, (120) [2022-11-16 16:13:22,652 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 342 states to 342 states and 486 transitions. [2022-11-16 16:13:22,652 INFO L78 Accepts]: Start accepts. Automaton has 342 states and 486 transitions. Word has length 64 [2022-11-16 16:13:22,652 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-16 16:13:22,653 INFO L495 AbstractCegarLoop]: Abstraction has 342 states and 486 transitions. [2022-11-16 16:13:22,653 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 26 states, 25 states have (on average 2.16) internal successors, (54), 23 states have internal predecessors, (54), 5 states have call successors, (16), 3 states have call predecessors, (16), 2 states have return successors, (15), 6 states have call predecessors, (15), 5 states have call successors, (15) [2022-11-16 16:13:22,653 INFO L276 IsEmpty]: Start isEmpty. Operand 342 states and 486 transitions. [2022-11-16 16:13:22,653 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 79 [2022-11-16 16:13:22,653 INFO L187 NwaCegarLoop]: Found error trace [2022-11-16 16:13:22,654 INFO L195 NwaCegarLoop]: trace histogram [9, 8, 8, 4, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-16 16:13:22,658 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_57ae48b7-7ca4-47ad-a8e2-3457df15573e/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (14)] Forceful destruction successful, exit code 0 [2022-11-16 16:13:22,854 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 14 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_57ae48b7-7ca4-47ad-a8e2-3457df15573e/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable12 [2022-11-16 16:13:22,854 INFO L420 AbstractCegarLoop]: === Iteration 14 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-16 16:13:22,855 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-16 16:13:22,855 INFO L85 PathProgramCache]: Analyzing trace with hash 1897496259, now seen corresponding path program 1 times [2022-11-16 16:13:22,855 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-16 16:13:22,855 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2109643031] [2022-11-16 16:13:22,855 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-16 16:13:22,855 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-16 16:13:22,864 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-11-16 16:13:22,864 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1808168803] [2022-11-16 16:13:22,864 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-16 16:13:22,864 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-16 16:13:22,864 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_57ae48b7-7ca4-47ad-a8e2-3457df15573e/bin/utaipan-Xvt2sAort0/z3 [2022-11-16 16:13:22,865 INFO L229 MonitoredProcess]: Starting monitored process 15 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_57ae48b7-7ca4-47ad-a8e2-3457df15573e/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-16 16:13:22,883 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_57ae48b7-7ca4-47ad-a8e2-3457df15573e/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (15)] Waiting until timeout for monitored process [2022-11-16 16:13:22,948 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-16 16:13:22,950 INFO L263 TraceCheckSpWp]: Trace formula consists of 221 conjuncts, 82 conjunts are in the unsatisfiable core [2022-11-16 16:13:22,953 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-16 16:13:24,025 INFO L134 CoverageAnalysis]: Checked inductivity of 159 backedges. 32 proven. 27 refuted. 0 times theorem prover too weak. 100 trivial. 0 not checked. [2022-11-16 16:13:24,025 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-16 16:13:31,469 INFO L134 CoverageAnalysis]: Checked inductivity of 159 backedges. 30 proven. 26 refuted. 0 times theorem prover too weak. 103 trivial. 0 not checked. [2022-11-16 16:13:31,470 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-16 16:13:31,470 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2109643031] [2022-11-16 16:13:31,470 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-11-16 16:13:31,470 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1808168803] [2022-11-16 16:13:31,470 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1808168803] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-16 16:13:31,471 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1084264227] [2022-11-16 16:13:31,473 INFO L159 IcfgInterpreter]: Started Sifa with 28 locations of interest [2022-11-16 16:13:31,473 INFO L166 IcfgInterpreter]: Building call graph [2022-11-16 16:13:31,473 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-16 16:13:31,473 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-16 16:13:31,474 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-16 16:13:37,533 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 8 for LOIs [2022-11-16 16:13:37,537 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 59 for LOIs [2022-11-16 16:13:37,550 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-16 16:13:50,313 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '10621#(and (= |__VERIFIER_assert_#in~cond| __VERIFIER_assert_~cond) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-16 16:13:50,313 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-16 16:13:50,313 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-11-16 16:13:50,314 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [19, 16] total 32 [2022-11-16 16:13:50,314 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1480788558] [2022-11-16 16:13:50,314 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2022-11-16 16:13:50,314 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 32 states [2022-11-16 16:13:50,315 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-16 16:13:50,315 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 32 interpolants. [2022-11-16 16:13:50,315 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=248, Invalid=2104, Unknown=0, NotChecked=0, Total=2352 [2022-11-16 16:13:50,316 INFO L87 Difference]: Start difference. First operand 342 states and 486 transitions. Second operand has 32 states, 29 states have (on average 1.9655172413793103) internal successors, (57), 30 states have internal predecessors, (57), 9 states have call successors, (23), 3 states have call predecessors, (23), 3 states have return successors, (22), 7 states have call predecessors, (22), 7 states have call successors, (22) [2022-11-16 16:14:02,221 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-11-16 16:14:12,902 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.97s for a HTC check with result VALID. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-11-16 16:14:50,456 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-16 16:14:50,456 INFO L93 Difference]: Finished difference Result 546 states and 787 transitions. [2022-11-16 16:14:50,457 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 67 states. [2022-11-16 16:14:50,457 INFO L78 Accepts]: Start accepts. Automaton has has 32 states, 29 states have (on average 1.9655172413793103) internal successors, (57), 30 states have internal predecessors, (57), 9 states have call successors, (23), 3 states have call predecessors, (23), 3 states have return successors, (22), 7 states have call predecessors, (22), 7 states have call successors, (22) Word has length 78 [2022-11-16 16:14:50,458 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-16 16:14:50,461 INFO L225 Difference]: With dead ends: 546 [2022-11-16 16:14:50,461 INFO L226 Difference]: Without dead ends: 542 [2022-11-16 16:14:50,464 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 292 GetRequests, 175 SyntacticMatches, 10 SemanticMatches, 107 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4089 ImplicationChecksByTransitivity, 48.7s TimeCoverageRelationStatistics Valid=1644, Invalid=10128, Unknown=0, NotChecked=0, Total=11772 [2022-11-16 16:14:50,465 INFO L413 NwaCegarLoop]: 49 mSDtfsCounter, 355 mSDsluCounter, 300 mSDsCounter, 0 mSdLazyCounter, 2275 mSolverCounterSat, 673 mSolverCounterUnsat, 1 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 26.9s Time, 0 mProtectedPredicate, 0 mProtectedAction, 355 SdHoareTripleChecker+Valid, 349 SdHoareTripleChecker+Invalid, 2949 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 673 IncrementalHoareTripleChecker+Valid, 2275 IncrementalHoareTripleChecker+Invalid, 1 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 27.3s IncrementalHoareTripleChecker+Time [2022-11-16 16:14:50,466 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [355 Valid, 349 Invalid, 2949 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [673 Valid, 2275 Invalid, 1 Unknown, 0 Unchecked, 27.3s Time] [2022-11-16 16:14:50,468 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 542 states. [2022-11-16 16:14:51,291 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 542 to 490. [2022-11-16 16:14:51,292 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 490 states, 290 states have (on average 1.2241379310344827) internal successors, (355), 291 states have internal predecessors, (355), 177 states have call successors, (177), 22 states have call predecessors, (177), 22 states have return successors, (176), 176 states have call predecessors, (176), 176 states have call successors, (176) [2022-11-16 16:14:51,295 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 490 states to 490 states and 708 transitions. [2022-11-16 16:14:51,296 INFO L78 Accepts]: Start accepts. Automaton has 490 states and 708 transitions. Word has length 78 [2022-11-16 16:14:51,296 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-16 16:14:51,296 INFO L495 AbstractCegarLoop]: Abstraction has 490 states and 708 transitions. [2022-11-16 16:14:51,296 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 32 states, 29 states have (on average 1.9655172413793103) internal successors, (57), 30 states have internal predecessors, (57), 9 states have call successors, (23), 3 states have call predecessors, (23), 3 states have return successors, (22), 7 states have call predecessors, (22), 7 states have call successors, (22) [2022-11-16 16:14:51,297 INFO L276 IsEmpty]: Start isEmpty. Operand 490 states and 708 transitions. [2022-11-16 16:14:51,298 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 82 [2022-11-16 16:14:51,298 INFO L187 NwaCegarLoop]: Found error trace [2022-11-16 16:14:51,298 INFO L195 NwaCegarLoop]: trace histogram [11, 10, 10, 4, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-16 16:14:51,310 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_57ae48b7-7ca4-47ad-a8e2-3457df15573e/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (15)] Ended with exit code 0 [2022-11-16 16:14:51,504 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable13,15 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_57ae48b7-7ca4-47ad-a8e2-3457df15573e/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-16 16:14:51,505 INFO L420 AbstractCegarLoop]: === Iteration 15 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-16 16:14:51,505 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-16 16:14:51,505 INFO L85 PathProgramCache]: Analyzing trace with hash -1729932497, now seen corresponding path program 1 times [2022-11-16 16:14:51,505 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-16 16:14:51,505 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1154633715] [2022-11-16 16:14:51,505 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-16 16:14:51,505 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-16 16:14:51,516 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-11-16 16:14:51,516 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1509270381] [2022-11-16 16:14:51,516 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-16 16:14:51,517 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-16 16:14:51,517 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_57ae48b7-7ca4-47ad-a8e2-3457df15573e/bin/utaipan-Xvt2sAort0/z3 [2022-11-16 16:14:51,522 INFO L229 MonitoredProcess]: Starting monitored process 16 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_57ae48b7-7ca4-47ad-a8e2-3457df15573e/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-16 16:14:51,523 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_57ae48b7-7ca4-47ad-a8e2-3457df15573e/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (16)] Waiting until timeout for monitored process [2022-11-16 16:14:51,591 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-16 16:14:51,593 INFO L263 TraceCheckSpWp]: Trace formula consists of 205 conjuncts, 36 conjunts are in the unsatisfiable core [2022-11-16 16:14:51,595 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-16 16:14:52,025 INFO L134 CoverageAnalysis]: Checked inductivity of 228 backedges. 21 proven. 19 refuted. 0 times theorem prover too weak. 188 trivial. 0 not checked. [2022-11-16 16:14:52,026 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-16 16:14:52,668 INFO L134 CoverageAnalysis]: Checked inductivity of 228 backedges. 22 proven. 14 refuted. 0 times theorem prover too weak. 192 trivial. 0 not checked. [2022-11-16 16:14:52,669 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-16 16:14:52,669 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1154633715] [2022-11-16 16:14:52,669 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-11-16 16:14:52,669 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1509270381] [2022-11-16 16:14:52,669 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1509270381] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-16 16:14:52,669 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [244723590] [2022-11-16 16:14:52,671 INFO L159 IcfgInterpreter]: Started Sifa with 26 locations of interest [2022-11-16 16:14:52,672 INFO L166 IcfgInterpreter]: Building call graph [2022-11-16 16:14:52,672 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-16 16:14:52,672 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-16 16:14:52,673 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-16 16:14:55,049 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 32 for LOIs [2022-11-16 16:14:55,088 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 59 for LOIs [2022-11-16 16:14:55,103 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-16 16:14:58,374 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '12905#(and (= |__VERIFIER_assert_#in~cond| __VERIFIER_assert_~cond) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-16 16:14:58,374 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-16 16:14:58,374 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-11-16 16:14:58,374 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 10] total 22 [2022-11-16 16:14:58,374 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1057162659] [2022-11-16 16:14:58,374 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2022-11-16 16:14:58,375 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 22 states [2022-11-16 16:14:58,375 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-16 16:14:58,375 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2022-11-16 16:14:58,376 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=180, Invalid=1302, Unknown=0, NotChecked=0, Total=1482 [2022-11-16 16:14:58,376 INFO L87 Difference]: Start difference. First operand 490 states and 708 transitions. Second operand has 22 states, 21 states have (on average 1.8571428571428572) internal successors, (39), 19 states have internal predecessors, (39), 9 states have call successors, (29), 3 states have call predecessors, (29), 2 states have return successors, (28), 9 states have call predecessors, (28), 9 states have call successors, (28) [2022-11-16 16:15:04,273 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-16 16:15:04,273 INFO L93 Difference]: Finished difference Result 862 states and 1335 transitions. [2022-11-16 16:15:04,274 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 37 states. [2022-11-16 16:15:04,274 INFO L78 Accepts]: Start accepts. Automaton has has 22 states, 21 states have (on average 1.8571428571428572) internal successors, (39), 19 states have internal predecessors, (39), 9 states have call successors, (29), 3 states have call predecessors, (29), 2 states have return successors, (28), 9 states have call predecessors, (28), 9 states have call successors, (28) Word has length 81 [2022-11-16 16:15:04,274 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-16 16:15:04,280 INFO L225 Difference]: With dead ends: 862 [2022-11-16 16:15:04,281 INFO L226 Difference]: Without dead ends: 860 [2022-11-16 16:15:04,283 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 273 GetRequests, 195 SyntacticMatches, 11 SemanticMatches, 67 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1820 ImplicationChecksByTransitivity, 5.2s TimeCoverageRelationStatistics Valid=735, Invalid=3957, Unknown=0, NotChecked=0, Total=4692 [2022-11-16 16:15:04,283 INFO L413 NwaCegarLoop]: 91 mSDtfsCounter, 190 mSDsluCounter, 439 mSDsCounter, 0 mSdLazyCounter, 843 mSolverCounterSat, 279 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2.7s Time, 0 mProtectedPredicate, 0 mProtectedAction, 195 SdHoareTripleChecker+Valid, 530 SdHoareTripleChecker+Invalid, 1122 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 279 IncrementalHoareTripleChecker+Valid, 843 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 2.8s IncrementalHoareTripleChecker+Time [2022-11-16 16:15:04,284 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [195 Valid, 530 Invalid, 1122 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [279 Valid, 843 Invalid, 0 Unknown, 0 Unchecked, 2.8s Time] [2022-11-16 16:15:04,285 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 860 states. [2022-11-16 16:15:05,516 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 860 to 825. [2022-11-16 16:15:05,517 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 825 states, 427 states have (on average 1.2927400468384076) internal successors, (552), 428 states have internal predecessors, (552), 373 states have call successors, (373), 24 states have call predecessors, (373), 24 states have return successors, (372), 372 states have call predecessors, (372), 372 states have call successors, (372) [2022-11-16 16:15:05,522 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 825 states to 825 states and 1297 transitions. [2022-11-16 16:15:05,522 INFO L78 Accepts]: Start accepts. Automaton has 825 states and 1297 transitions. Word has length 81 [2022-11-16 16:15:05,523 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-16 16:15:05,523 INFO L495 AbstractCegarLoop]: Abstraction has 825 states and 1297 transitions. [2022-11-16 16:15:05,523 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 22 states, 21 states have (on average 1.8571428571428572) internal successors, (39), 19 states have internal predecessors, (39), 9 states have call successors, (29), 3 states have call predecessors, (29), 2 states have return successors, (28), 9 states have call predecessors, (28), 9 states have call successors, (28) [2022-11-16 16:15:05,523 INFO L276 IsEmpty]: Start isEmpty. Operand 825 states and 1297 transitions. [2022-11-16 16:15:05,525 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 82 [2022-11-16 16:15:05,525 INFO L187 NwaCegarLoop]: Found error trace [2022-11-16 16:15:05,525 INFO L195 NwaCegarLoop]: trace histogram [10, 9, 9, 4, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-16 16:15:05,531 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_57ae48b7-7ca4-47ad-a8e2-3457df15573e/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (16)] Forceful destruction successful, exit code 0 [2022-11-16 16:15:05,727 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 16 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_57ae48b7-7ca4-47ad-a8e2-3457df15573e/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable14 [2022-11-16 16:15:05,728 INFO L420 AbstractCegarLoop]: === Iteration 16 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-16 16:15:05,728 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-16 16:15:05,728 INFO L85 PathProgramCache]: Analyzing trace with hash 144664241, now seen corresponding path program 1 times [2022-11-16 16:15:05,729 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-16 16:15:05,729 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1140562007] [2022-11-16 16:15:05,729 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-16 16:15:05,729 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-16 16:15:05,740 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-11-16 16:15:05,740 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1036953387] [2022-11-16 16:15:05,741 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-16 16:15:05,741 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-16 16:15:05,741 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_57ae48b7-7ca4-47ad-a8e2-3457df15573e/bin/utaipan-Xvt2sAort0/z3 [2022-11-16 16:15:05,742 INFO L229 MonitoredProcess]: Starting monitored process 17 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_57ae48b7-7ca4-47ad-a8e2-3457df15573e/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-16 16:15:05,755 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_57ae48b7-7ca4-47ad-a8e2-3457df15573e/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (17)] Waiting until timeout for monitored process [2022-11-16 16:15:05,821 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-16 16:15:05,823 INFO L263 TraceCheckSpWp]: Trace formula consists of 218 conjuncts, 57 conjunts are in the unsatisfiable core [2022-11-16 16:15:05,825 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-16 16:15:06,865 INFO L134 CoverageAnalysis]: Checked inductivity of 194 backedges. 19 proven. 23 refuted. 0 times theorem prover too weak. 152 trivial. 0 not checked. [2022-11-16 16:15:06,865 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-16 16:15:08,519 INFO L134 CoverageAnalysis]: Checked inductivity of 194 backedges. 18 proven. 20 refuted. 0 times theorem prover too weak. 156 trivial. 0 not checked. [2022-11-16 16:15:08,519 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-16 16:15:08,519 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1140562007] [2022-11-16 16:15:08,519 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-11-16 16:15:08,519 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1036953387] [2022-11-16 16:15:08,519 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1036953387] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-16 16:15:08,519 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1635614282] [2022-11-16 16:15:08,521 INFO L159 IcfgInterpreter]: Started Sifa with 27 locations of interest [2022-11-16 16:15:08,522 INFO L166 IcfgInterpreter]: Building call graph [2022-11-16 16:15:08,522 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-16 16:15:08,522 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-16 16:15:08,523 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-16 16:15:15,205 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 39 for LOIs [2022-11-16 16:15:15,257 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 59 for LOIs [2022-11-16 16:15:15,271 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-16 16:15:23,618 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '16277#(and (= |__VERIFIER_assert_#in~cond| __VERIFIER_assert_~cond) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-16 16:15:23,618 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-16 16:15:23,618 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-11-16 16:15:23,618 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 12] total 25 [2022-11-16 16:15:23,618 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1367519684] [2022-11-16 16:15:23,619 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2022-11-16 16:15:23,619 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 25 states [2022-11-16 16:15:23,619 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-16 16:15:23,620 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2022-11-16 16:15:23,621 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=195, Invalid=1445, Unknown=0, NotChecked=0, Total=1640 [2022-11-16 16:15:23,621 INFO L87 Difference]: Start difference. First operand 825 states and 1297 transitions. Second operand has 25 states, 24 states have (on average 2.0416666666666665) internal successors, (49), 22 states have internal predecessors, (49), 9 states have call successors, (27), 3 states have call predecessors, (27), 2 states have return successors, (26), 9 states have call predecessors, (26), 9 states have call successors, (26) [2022-11-16 16:15:38,222 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.01s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-11-16 16:15:49,908 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.98s for a HTC check with result INVALID. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-11-16 16:16:04,972 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-16 16:16:04,972 INFO L93 Difference]: Finished difference Result 1132 states and 1774 transitions. [2022-11-16 16:16:04,973 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 43 states. [2022-11-16 16:16:04,973 INFO L78 Accepts]: Start accepts. Automaton has has 25 states, 24 states have (on average 2.0416666666666665) internal successors, (49), 22 states have internal predecessors, (49), 9 states have call successors, (27), 3 states have call predecessors, (27), 2 states have return successors, (26), 9 states have call predecessors, (26), 9 states have call successors, (26) Word has length 81 [2022-11-16 16:16:04,974 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-16 16:16:04,979 INFO L225 Difference]: With dead ends: 1132 [2022-11-16 16:16:04,980 INFO L226 Difference]: Without dead ends: 1130 [2022-11-16 16:16:04,982 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 275 GetRequests, 184 SyntacticMatches, 18 SemanticMatches, 73 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2264 ImplicationChecksByTransitivity, 32.3s TimeCoverageRelationStatistics Valid=914, Invalid=4636, Unknown=0, NotChecked=0, Total=5550 [2022-11-16 16:16:04,982 INFO L413 NwaCegarLoop]: 62 mSDtfsCounter, 276 mSDsluCounter, 319 mSDsCounter, 0 mSdLazyCounter, 1328 mSolverCounterSat, 389 mSolverCounterUnsat, 1 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 16.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 277 SdHoareTripleChecker+Valid, 381 SdHoareTripleChecker+Invalid, 1718 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 389 IncrementalHoareTripleChecker+Valid, 1328 IncrementalHoareTripleChecker+Invalid, 1 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 16.7s IncrementalHoareTripleChecker+Time [2022-11-16 16:16:04,983 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [277 Valid, 381 Invalid, 1718 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [389 Valid, 1328 Invalid, 1 Unknown, 0 Unchecked, 16.7s Time] [2022-11-16 16:16:04,984 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1130 states. [2022-11-16 16:16:06,783 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1130 to 1101. [2022-11-16 16:16:06,785 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1101 states, 571 states have (on average 1.299474605954466) internal successors, (742), 572 states have internal predecessors, (742), 501 states have call successors, (501), 28 states have call predecessors, (501), 28 states have return successors, (500), 500 states have call predecessors, (500), 500 states have call successors, (500) [2022-11-16 16:16:06,793 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1101 states to 1101 states and 1743 transitions. [2022-11-16 16:16:06,794 INFO L78 Accepts]: Start accepts. Automaton has 1101 states and 1743 transitions. Word has length 81 [2022-11-16 16:16:06,794 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-16 16:16:06,794 INFO L495 AbstractCegarLoop]: Abstraction has 1101 states and 1743 transitions. [2022-11-16 16:16:06,795 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 25 states, 24 states have (on average 2.0416666666666665) internal successors, (49), 22 states have internal predecessors, (49), 9 states have call successors, (27), 3 states have call predecessors, (27), 2 states have return successors, (26), 9 states have call predecessors, (26), 9 states have call successors, (26) [2022-11-16 16:16:06,795 INFO L276 IsEmpty]: Start isEmpty. Operand 1101 states and 1743 transitions. [2022-11-16 16:16:06,796 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 85 [2022-11-16 16:16:06,797 INFO L187 NwaCegarLoop]: Found error trace [2022-11-16 16:16:06,797 INFO L195 NwaCegarLoop]: trace histogram [9, 8, 8, 5, 4, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-16 16:16:06,805 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_57ae48b7-7ca4-47ad-a8e2-3457df15573e/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (17)] Forceful destruction successful, exit code 0 [2022-11-16 16:16:07,003 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 17 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_57ae48b7-7ca4-47ad-a8e2-3457df15573e/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable15 [2022-11-16 16:16:07,004 INFO L420 AbstractCegarLoop]: === Iteration 17 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-16 16:16:07,004 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-16 16:16:07,004 INFO L85 PathProgramCache]: Analyzing trace with hash 646028470, now seen corresponding path program 6 times [2022-11-16 16:16:07,005 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-16 16:16:07,005 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2007477604] [2022-11-16 16:16:07,005 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-16 16:16:07,005 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-16 16:16:07,031 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-11-16 16:16:07,032 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1436164930] [2022-11-16 16:16:07,032 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-11-16 16:16:07,032 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-16 16:16:07,032 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_57ae48b7-7ca4-47ad-a8e2-3457df15573e/bin/utaipan-Xvt2sAort0/z3 [2022-11-16 16:16:07,034 INFO L229 MonitoredProcess]: Starting monitored process 18 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_57ae48b7-7ca4-47ad-a8e2-3457df15573e/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-16 16:16:07,051 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_57ae48b7-7ca4-47ad-a8e2-3457df15573e/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (18)] Waiting until timeout for monitored process [2022-11-16 16:16:07,133 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-11-16 16:16:07,133 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-16 16:16:07,135 INFO L263 TraceCheckSpWp]: Trace formula consists of 208 conjuncts, 35 conjunts are in the unsatisfiable core [2022-11-16 16:16:07,138 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-16 16:16:09,983 INFO L134 CoverageAnalysis]: Checked inductivity of 178 backedges. 34 proven. 44 refuted. 0 times theorem prover too weak. 100 trivial. 0 not checked. [2022-11-16 16:16:09,983 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-16 16:16:11,082 INFO L134 CoverageAnalysis]: Checked inductivity of 178 backedges. 55 proven. 9 refuted. 0 times theorem prover too weak. 114 trivial. 0 not checked. [2022-11-16 16:16:11,082 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-16 16:16:11,083 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2007477604] [2022-11-16 16:16:11,083 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-11-16 16:16:11,083 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1436164930] [2022-11-16 16:16:11,083 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1436164930] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-16 16:16:11,083 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [636462178] [2022-11-16 16:16:11,085 INFO L159 IcfgInterpreter]: Started Sifa with 27 locations of interest [2022-11-16 16:16:11,085 INFO L166 IcfgInterpreter]: Building call graph [2022-11-16 16:16:11,085 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-16 16:16:11,086 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-16 16:16:11,086 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-16 16:16:16,731 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 50 for LOIs [2022-11-16 16:16:16,796 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 59 for LOIs [2022-11-16 16:16:16,812 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-16 16:16:21,241 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '20594#(and (= |__VERIFIER_assert_#in~cond| __VERIFIER_assert_~cond) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-16 16:16:21,241 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-16 16:16:21,241 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-11-16 16:16:21,241 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [19, 8] total 24 [2022-11-16 16:16:21,241 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [175002853] [2022-11-16 16:16:21,241 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2022-11-16 16:16:21,242 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 24 states [2022-11-16 16:16:21,242 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-16 16:16:21,242 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2022-11-16 16:16:21,243 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=182, Invalid=1624, Unknown=0, NotChecked=0, Total=1806 [2022-11-16 16:16:21,243 INFO L87 Difference]: Start difference. First operand 1101 states and 1743 transitions. Second operand has 24 states, 23 states have (on average 2.739130434782609) internal successors, (63), 20 states have internal predecessors, (63), 8 states have call successors, (21), 3 states have call predecessors, (21), 3 states have return successors, (21), 6 states have call predecessors, (21), 6 states have call successors, (21) [2022-11-16 16:17:02,232 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-16 16:17:02,232 INFO L93 Difference]: Finished difference Result 1221 states and 1909 transitions. [2022-11-16 16:17:02,233 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 25 states. [2022-11-16 16:17:02,233 INFO L78 Accepts]: Start accepts. Automaton has has 24 states, 23 states have (on average 2.739130434782609) internal successors, (63), 20 states have internal predecessors, (63), 8 states have call successors, (21), 3 states have call predecessors, (21), 3 states have return successors, (21), 6 states have call predecessors, (21), 6 states have call successors, (21) Word has length 84 [2022-11-16 16:17:02,233 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-16 16:17:02,240 INFO L225 Difference]: With dead ends: 1221 [2022-11-16 16:17:02,240 INFO L226 Difference]: Without dead ends: 1219 [2022-11-16 16:17:02,242 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 275 GetRequests, 205 SyntacticMatches, 11 SemanticMatches, 59 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1542 ImplicationChecksByTransitivity, 27.9s TimeCoverageRelationStatistics Valid=378, Invalid=3282, Unknown=0, NotChecked=0, Total=3660 [2022-11-16 16:17:02,243 INFO L413 NwaCegarLoop]: 43 mSDtfsCounter, 113 mSDsluCounter, 307 mSDsCounter, 0 mSdLazyCounter, 1285 mSolverCounterSat, 149 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 17.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 115 SdHoareTripleChecker+Valid, 350 SdHoareTripleChecker+Invalid, 1434 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 149 IncrementalHoareTripleChecker+Valid, 1285 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 17.7s IncrementalHoareTripleChecker+Time [2022-11-16 16:17:02,243 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [115 Valid, 350 Invalid, 1434 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [149 Valid, 1285 Invalid, 0 Unknown, 0 Unchecked, 17.7s Time] [2022-11-16 16:17:02,245 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1219 states. [2022-11-16 16:17:04,237 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1219 to 1125. [2022-11-16 16:17:04,239 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1125 states, 589 states have (on average 1.2903225806451613) internal successors, (760), 590 states have internal predecessors, (760), 501 states have call successors, (501), 34 states have call predecessors, (501), 34 states have return successors, (500), 500 states have call predecessors, (500), 500 states have call successors, (500) [2022-11-16 16:17:04,245 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1125 states to 1125 states and 1761 transitions. [2022-11-16 16:17:04,245 INFO L78 Accepts]: Start accepts. Automaton has 1125 states and 1761 transitions. Word has length 84 [2022-11-16 16:17:04,245 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-16 16:17:04,246 INFO L495 AbstractCegarLoop]: Abstraction has 1125 states and 1761 transitions. [2022-11-16 16:17:04,246 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 24 states, 23 states have (on average 2.739130434782609) internal successors, (63), 20 states have internal predecessors, (63), 8 states have call successors, (21), 3 states have call predecessors, (21), 3 states have return successors, (21), 6 states have call predecessors, (21), 6 states have call successors, (21) [2022-11-16 16:17:04,246 INFO L276 IsEmpty]: Start isEmpty. Operand 1125 states and 1761 transitions. [2022-11-16 16:17:04,248 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 99 [2022-11-16 16:17:04,248 INFO L187 NwaCegarLoop]: Found error trace [2022-11-16 16:17:04,248 INFO L195 NwaCegarLoop]: trace histogram [13, 12, 12, 4, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-16 16:17:04,258 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_57ae48b7-7ca4-47ad-a8e2-3457df15573e/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (18)] Ended with exit code 0 [2022-11-16 16:17:04,453 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 18 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_57ae48b7-7ca4-47ad-a8e2-3457df15573e/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable16 [2022-11-16 16:17:04,454 INFO L420 AbstractCegarLoop]: === Iteration 18 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-16 16:17:04,454 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-16 16:17:04,454 INFO L85 PathProgramCache]: Analyzing trace with hash 355863159, now seen corresponding path program 2 times [2022-11-16 16:17:04,454 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-16 16:17:04,454 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1873307989] [2022-11-16 16:17:04,454 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-16 16:17:04,455 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-16 16:17:04,461 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-11-16 16:17:04,462 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1133190649] [2022-11-16 16:17:04,462 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-11-16 16:17:04,462 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-16 16:17:04,462 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_57ae48b7-7ca4-47ad-a8e2-3457df15573e/bin/utaipan-Xvt2sAort0/z3 [2022-11-16 16:17:04,463 INFO L229 MonitoredProcess]: Starting monitored process 19 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_57ae48b7-7ca4-47ad-a8e2-3457df15573e/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-16 16:17:04,483 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_57ae48b7-7ca4-47ad-a8e2-3457df15573e/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (19)] Waiting until timeout for monitored process [2022-11-16 16:17:04,543 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 5 check-sat command(s) [2022-11-16 16:17:04,543 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-16 16:17:04,545 INFO L263 TraceCheckSpWp]: Trace formula consists of 193 conjuncts, 67 conjunts are in the unsatisfiable core [2022-11-16 16:17:04,547 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-16 16:17:05,947 INFO L134 CoverageAnalysis]: Checked inductivity of 327 backedges. 26 proven. 29 refuted. 0 times theorem prover too weak. 272 trivial. 0 not checked. [2022-11-16 16:17:05,947 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-16 16:17:07,605 INFO L134 CoverageAnalysis]: Checked inductivity of 327 backedges. 24 proven. 30 refuted. 0 times theorem prover too weak. 273 trivial. 0 not checked. [2022-11-16 16:17:07,605 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-16 16:17:07,606 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1873307989] [2022-11-16 16:17:07,606 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-11-16 16:17:07,606 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1133190649] [2022-11-16 16:17:07,606 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1133190649] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-16 16:17:07,606 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [701846317] [2022-11-16 16:17:07,608 INFO L159 IcfgInterpreter]: Started Sifa with 28 locations of interest [2022-11-16 16:17:07,608 INFO L166 IcfgInterpreter]: Building call graph [2022-11-16 16:17:07,608 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-16 16:17:07,609 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-16 16:17:07,609 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-16 16:17:13,544 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 39 for LOIs [2022-11-16 16:17:13,588 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 59 for LOIs [2022-11-16 16:17:13,601 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-16 16:17:20,205 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '25164#(and (= |__VERIFIER_assert_#in~cond| __VERIFIER_assert_~cond) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-16 16:17:20,205 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-16 16:17:20,205 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-11-16 16:17:20,205 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [19, 19] total 35 [2022-11-16 16:17:20,205 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [362646124] [2022-11-16 16:17:20,206 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2022-11-16 16:17:20,206 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 35 states [2022-11-16 16:17:20,206 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-16 16:17:20,207 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 35 interpolants. [2022-11-16 16:17:20,207 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=291, Invalid=2361, Unknown=0, NotChecked=0, Total=2652 [2022-11-16 16:17:20,208 INFO L87 Difference]: Start difference. First operand 1125 states and 1761 transitions. Second operand has 35 states, 32 states have (on average 1.65625) internal successors, (53), 31 states have internal predecessors, (53), 11 states have call successors, (33), 3 states have call predecessors, (33), 2 states have return successors, (32), 10 states have call predecessors, (32), 9 states have call successors, (32) [2022-11-16 16:17:28,845 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-11-16 16:18:00,584 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.89s for a HTC check with result INVALID. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-11-16 16:18:31,807 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-11-16 16:18:43,051 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-16 16:18:43,051 INFO L93 Difference]: Finished difference Result 1847 states and 2961 transitions. [2022-11-16 16:18:43,051 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 103 states. [2022-11-16 16:18:43,051 INFO L78 Accepts]: Start accepts. Automaton has has 35 states, 32 states have (on average 1.65625) internal successors, (53), 31 states have internal predecessors, (53), 11 states have call successors, (33), 3 states have call predecessors, (33), 2 states have return successors, (32), 10 states have call predecessors, (32), 9 states have call successors, (32) Word has length 98 [2022-11-16 16:18:43,052 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-16 16:18:43,060 INFO L225 Difference]: With dead ends: 1847 [2022-11-16 16:18:43,061 INFO L226 Difference]: Without dead ends: 1839 [2022-11-16 16:18:43,064 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 386 GetRequests, 223 SyntacticMatches, 19 SemanticMatches, 144 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8180 ImplicationChecksByTransitivity, 54.2s TimeCoverageRelationStatistics Valid=2703, Invalid=18467, Unknown=0, NotChecked=0, Total=21170 [2022-11-16 16:18:43,064 INFO L413 NwaCegarLoop]: 148 mSDtfsCounter, 393 mSDsluCounter, 814 mSDsCounter, 0 mSdLazyCounter, 3282 mSolverCounterSat, 664 mSolverCounterUnsat, 2 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 32.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 406 SdHoareTripleChecker+Valid, 962 SdHoareTripleChecker+Invalid, 3948 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 664 IncrementalHoareTripleChecker+Valid, 3282 IncrementalHoareTripleChecker+Invalid, 2 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 32.9s IncrementalHoareTripleChecker+Time [2022-11-16 16:18:43,065 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [406 Valid, 962 Invalid, 3948 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [664 Valid, 3282 Invalid, 2 Unknown, 0 Unchecked, 32.9s Time] [2022-11-16 16:18:43,067 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1839 states. [2022-11-16 16:18:45,326 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1839 to 1264. [2022-11-16 16:18:45,328 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1264 states, 655 states have (on average 1.2931297709923664) internal successors, (847), 656 states have internal predecessors, (847), 573 states have call successors, (573), 35 states have call predecessors, (573), 35 states have return successors, (572), 572 states have call predecessors, (572), 572 states have call successors, (572) [2022-11-16 16:18:45,334 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1264 states to 1264 states and 1992 transitions. [2022-11-16 16:18:45,334 INFO L78 Accepts]: Start accepts. Automaton has 1264 states and 1992 transitions. Word has length 98 [2022-11-16 16:18:45,335 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-16 16:18:45,335 INFO L495 AbstractCegarLoop]: Abstraction has 1264 states and 1992 transitions. [2022-11-16 16:18:45,335 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 35 states, 32 states have (on average 1.65625) internal successors, (53), 31 states have internal predecessors, (53), 11 states have call successors, (33), 3 states have call predecessors, (33), 2 states have return successors, (32), 10 states have call predecessors, (32), 9 states have call successors, (32) [2022-11-16 16:18:45,335 INFO L276 IsEmpty]: Start isEmpty. Operand 1264 states and 1992 transitions. [2022-11-16 16:18:45,338 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 109 [2022-11-16 16:18:45,338 INFO L187 NwaCegarLoop]: Found error trace [2022-11-16 16:18:45,338 INFO L195 NwaCegarLoop]: trace histogram [14, 13, 13, 4, 4, 4, 4, 4, 4, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-16 16:18:45,344 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_57ae48b7-7ca4-47ad-a8e2-3457df15573e/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (19)] Forceful destruction successful, exit code 0 [2022-11-16 16:18:45,544 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 19 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_57ae48b7-7ca4-47ad-a8e2-3457df15573e/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable17 [2022-11-16 16:18:45,544 INFO L420 AbstractCegarLoop]: === Iteration 19 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-16 16:18:45,544 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-16 16:18:45,544 INFO L85 PathProgramCache]: Analyzing trace with hash 1547138168, now seen corresponding path program 2 times [2022-11-16 16:18:45,544 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-16 16:18:45,544 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [352959220] [2022-11-16 16:18:45,545 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-16 16:18:45,545 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-16 16:18:45,553 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-11-16 16:18:45,553 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1630008427] [2022-11-16 16:18:45,553 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-11-16 16:18:45,553 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-16 16:18:45,554 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_57ae48b7-7ca4-47ad-a8e2-3457df15573e/bin/utaipan-Xvt2sAort0/z3 [2022-11-16 16:18:45,554 INFO L229 MonitoredProcess]: Starting monitored process 20 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_57ae48b7-7ca4-47ad-a8e2-3457df15573e/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-16 16:18:45,561 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_57ae48b7-7ca4-47ad-a8e2-3457df15573e/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (20)] Waiting until timeout for monitored process [2022-11-16 16:18:45,631 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2022-11-16 16:18:45,631 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-16 16:18:45,633 INFO L263 TraceCheckSpWp]: Trace formula consists of 195 conjuncts, 69 conjunts are in the unsatisfiable core [2022-11-16 16:18:45,635 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-16 16:18:47,146 INFO L134 CoverageAnalysis]: Checked inductivity of 396 backedges. 70 proven. 35 refuted. 0 times theorem prover too weak. 291 trivial. 0 not checked. [2022-11-16 16:18:47,146 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-16 16:18:48,174 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-16 16:18:48,175 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [352959220] [2022-11-16 16:18:48,175 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-11-16 16:18:48,175 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1630008427] [2022-11-16 16:18:48,175 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1630008427] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-16 16:18:48,175 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1705950245] [2022-11-16 16:18:48,176 INFO L159 IcfgInterpreter]: Started Sifa with 27 locations of interest [2022-11-16 16:18:48,177 INFO L166 IcfgInterpreter]: Building call graph [2022-11-16 16:18:48,177 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-16 16:18:48,177 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-16 16:18:48,177 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-16 16:18:53,891 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 39 for LOIs [2022-11-16 16:18:53,932 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 59 for LOIs [2022-11-16 16:18:53,943 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-16 16:19:04,804 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '30978#(and (= |__VERIFIER_assert_#in~cond| __VERIFIER_assert_~cond) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-16 16:19:04,804 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-16 16:19:04,804 INFO L184 FreeRefinementEngine]: Found 0 perfect and 1 imperfect interpolant sequences. [2022-11-16 16:19:04,804 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [18] total 18 [2022-11-16 16:19:04,804 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [892178018] [2022-11-16 16:19:04,804 INFO L85 oduleStraightlineAll]: Using 1 imperfect interpolants to construct interpolant automaton [2022-11-16 16:19:04,805 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 18 states [2022-11-16 16:19:04,805 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-16 16:19:04,805 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2022-11-16 16:19:04,805 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=172, Invalid=1387, Unknown=1, NotChecked=0, Total=1560 [2022-11-16 16:19:04,805 INFO L87 Difference]: Start difference. First operand 1264 states and 1992 transitions. Second operand has 18 states, 17 states have (on average 2.176470588235294) internal successors, (37), 16 states have internal predecessors, (37), 5 states have call successors, (14), 2 states have call predecessors, (14), 3 states have return successors, (13), 5 states have call predecessors, (13), 5 states have call successors, (13) [2022-11-16 16:19:08,553 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-16 16:19:08,553 INFO L93 Difference]: Finished difference Result 1418 states and 2227 transitions. [2022-11-16 16:19:08,554 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2022-11-16 16:19:08,554 INFO L78 Accepts]: Start accepts. Automaton has has 18 states, 17 states have (on average 2.176470588235294) internal successors, (37), 16 states have internal predecessors, (37), 5 states have call successors, (14), 2 states have call predecessors, (14), 3 states have return successors, (13), 5 states have call predecessors, (13), 5 states have call successors, (13) Word has length 108 [2022-11-16 16:19:08,554 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-16 16:19:08,560 INFO L225 Difference]: With dead ends: 1418 [2022-11-16 16:19:08,560 INFO L226 Difference]: Without dead ends: 1416 [2022-11-16 16:19:08,562 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 243 GetRequests, 172 SyntacticMatches, 25 SemanticMatches, 46 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1540 ImplicationChecksByTransitivity, 12.5s TimeCoverageRelationStatistics Valid=250, Invalid=2005, Unknown=1, NotChecked=0, Total=2256 [2022-11-16 16:19:08,562 INFO L413 NwaCegarLoop]: 49 mSDtfsCounter, 100 mSDsluCounter, 191 mSDsCounter, 0 mSdLazyCounter, 1040 mSolverCounterSat, 78 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 116 SdHoareTripleChecker+Valid, 240 SdHoareTripleChecker+Invalid, 1118 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 78 IncrementalHoareTripleChecker+Valid, 1040 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.1s IncrementalHoareTripleChecker+Time [2022-11-16 16:19:08,563 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [116 Valid, 240 Invalid, 1118 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [78 Valid, 1040 Invalid, 0 Unknown, 0 Unchecked, 1.1s Time] [2022-11-16 16:19:08,564 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1416 states. [2022-11-16 16:19:10,819 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1416 to 1396. [2022-11-16 16:19:10,820 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1396 states, 719 states have (on average 1.2962447844228095) internal successors, (932), 720 states have internal predecessors, (932), 637 states have call successors, (637), 39 states have call predecessors, (637), 39 states have return successors, (636), 636 states have call predecessors, (636), 636 states have call successors, (636) [2022-11-16 16:19:10,826 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1396 states to 1396 states and 2205 transitions. [2022-11-16 16:19:10,827 INFO L78 Accepts]: Start accepts. Automaton has 1396 states and 2205 transitions. Word has length 108 [2022-11-16 16:19:10,827 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-16 16:19:10,827 INFO L495 AbstractCegarLoop]: Abstraction has 1396 states and 2205 transitions. [2022-11-16 16:19:10,827 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 18 states, 17 states have (on average 2.176470588235294) internal successors, (37), 16 states have internal predecessors, (37), 5 states have call successors, (14), 2 states have call predecessors, (14), 3 states have return successors, (13), 5 states have call predecessors, (13), 5 states have call successors, (13) [2022-11-16 16:19:10,828 INFO L276 IsEmpty]: Start isEmpty. Operand 1396 states and 2205 transitions. [2022-11-16 16:19:10,830 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 112 [2022-11-16 16:19:10,830 INFO L187 NwaCegarLoop]: Found error trace [2022-11-16 16:19:10,830 INFO L195 NwaCegarLoop]: trace histogram [14, 13, 13, 5, 4, 4, 4, 4, 4, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-16 16:19:10,840 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_57ae48b7-7ca4-47ad-a8e2-3457df15573e/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (20)] Forceful destruction successful, exit code 0 [2022-11-16 16:19:11,035 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable18,20 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_57ae48b7-7ca4-47ad-a8e2-3457df15573e/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-16 16:19:11,036 INFO L420 AbstractCegarLoop]: === Iteration 20 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-16 16:19:11,036 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-16 16:19:11,036 INFO L85 PathProgramCache]: Analyzing trace with hash -1168736987, now seen corresponding path program 3 times [2022-11-16 16:19:11,037 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-16 16:19:11,037 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [703375933] [2022-11-16 16:19:11,037 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-16 16:19:11,037 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-16 16:19:11,046 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-11-16 16:19:11,052 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [403847320] [2022-11-16 16:19:11,052 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-11-16 16:19:11,053 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-16 16:19:11,053 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_57ae48b7-7ca4-47ad-a8e2-3457df15573e/bin/utaipan-Xvt2sAort0/z3 [2022-11-16 16:19:11,054 INFO L229 MonitoredProcess]: Starting monitored process 21 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_57ae48b7-7ca4-47ad-a8e2-3457df15573e/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-16 16:19:11,057 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_57ae48b7-7ca4-47ad-a8e2-3457df15573e/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (21)] Waiting until timeout for monitored process [2022-11-16 16:19:11,125 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-11-16 16:19:11,126 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-16 16:19:11,127 INFO L263 TraceCheckSpWp]: Trace formula consists of 259 conjuncts, 20 conjunts are in the unsatisfiable core [2022-11-16 16:19:11,129 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-16 16:19:11,366 INFO L134 CoverageAnalysis]: Checked inductivity of 405 backedges. 96 proven. 34 refuted. 0 times theorem prover too weak. 275 trivial. 0 not checked. [2022-11-16 16:19:11,366 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-16 16:19:11,663 INFO L134 CoverageAnalysis]: Checked inductivity of 405 backedges. 48 proven. 36 refuted. 0 times theorem prover too weak. 321 trivial. 0 not checked. [2022-11-16 16:19:11,664 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-16 16:19:11,664 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [703375933] [2022-11-16 16:19:11,664 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-11-16 16:19:11,664 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [403847320] [2022-11-16 16:19:11,664 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [403847320] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-16 16:19:11,664 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1309203160] [2022-11-16 16:19:11,665 INFO L159 IcfgInterpreter]: Started Sifa with 27 locations of interest [2022-11-16 16:19:11,666 INFO L166 IcfgInterpreter]: Building call graph [2022-11-16 16:19:11,666 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-16 16:19:11,666 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-16 16:19:11,666 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-16 16:19:17,323 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 39 for LOIs [2022-11-16 16:19:17,364 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 59 for LOIs [2022-11-16 16:19:17,377 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-16 16:19:20,492 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '36381#(and (= |__VERIFIER_assert_#in~cond| __VERIFIER_assert_~cond) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-16 16:19:20,492 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-16 16:19:20,492 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-11-16 16:19:20,492 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 14] total 23 [2022-11-16 16:19:20,492 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1837444939] [2022-11-16 16:19:20,492 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2022-11-16 16:19:20,493 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 23 states [2022-11-16 16:19:20,493 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-16 16:19:20,493 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2022-11-16 16:19:20,494 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=150, Invalid=1332, Unknown=0, NotChecked=0, Total=1482 [2022-11-16 16:19:20,494 INFO L87 Difference]: Start difference. First operand 1396 states and 2205 transitions. Second operand has 23 states, 22 states have (on average 2.727272727272727) internal successors, (60), 21 states have internal predecessors, (60), 10 states have call successors, (33), 2 states have call predecessors, (33), 3 states have return successors, (33), 10 states have call predecessors, (33), 10 states have call successors, (33) [2022-11-16 16:19:24,773 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-16 16:19:24,773 INFO L93 Difference]: Finished difference Result 2415 states and 3812 transitions. [2022-11-16 16:19:24,773 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 30 states. [2022-11-16 16:19:24,774 INFO L78 Accepts]: Start accepts. Automaton has has 23 states, 22 states have (on average 2.727272727272727) internal successors, (60), 21 states have internal predecessors, (60), 10 states have call successors, (33), 2 states have call predecessors, (33), 3 states have return successors, (33), 10 states have call predecessors, (33), 10 states have call successors, (33) Word has length 111 [2022-11-16 16:19:24,774 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-16 16:19:24,779 INFO L225 Difference]: With dead ends: 2415 [2022-11-16 16:19:24,780 INFO L226 Difference]: Without dead ends: 1588 [2022-11-16 16:19:24,784 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 357 GetRequests, 266 SyntacticMatches, 28 SemanticMatches, 63 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1916 ImplicationChecksByTransitivity, 4.1s TimeCoverageRelationStatistics Valid=698, Invalid=3462, Unknown=0, NotChecked=0, Total=4160 [2022-11-16 16:19:24,785 INFO L413 NwaCegarLoop]: 84 mSDtfsCounter, 155 mSDsluCounter, 312 mSDsCounter, 0 mSdLazyCounter, 875 mSolverCounterSat, 271 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 155 SdHoareTripleChecker+Valid, 396 SdHoareTripleChecker+Invalid, 1146 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 271 IncrementalHoareTripleChecker+Valid, 875 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.7s IncrementalHoareTripleChecker+Time [2022-11-16 16:19:24,785 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [155 Valid, 396 Invalid, 1146 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [271 Valid, 875 Invalid, 0 Unknown, 0 Unchecked, 0.7s Time] [2022-11-16 16:19:24,787 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1588 states. [2022-11-16 16:19:27,209 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1588 to 1445. [2022-11-16 16:19:27,212 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1445 states, 773 states have (on average 1.279430789133247) internal successors, (989), 794 states have internal predecessors, (989), 633 states have call successors, (633), 38 states have call predecessors, (633), 38 states have return successors, (631), 612 states have call predecessors, (631), 631 states have call successors, (631) [2022-11-16 16:19:27,252 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1445 states to 1445 states and 2253 transitions. [2022-11-16 16:19:27,253 INFO L78 Accepts]: Start accepts. Automaton has 1445 states and 2253 transitions. Word has length 111 [2022-11-16 16:19:27,254 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-16 16:19:27,254 INFO L495 AbstractCegarLoop]: Abstraction has 1445 states and 2253 transitions. [2022-11-16 16:19:27,254 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 23 states, 22 states have (on average 2.727272727272727) internal successors, (60), 21 states have internal predecessors, (60), 10 states have call successors, (33), 2 states have call predecessors, (33), 3 states have return successors, (33), 10 states have call predecessors, (33), 10 states have call successors, (33) [2022-11-16 16:19:27,254 INFO L276 IsEmpty]: Start isEmpty. Operand 1445 states and 2253 transitions. [2022-11-16 16:19:27,257 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 117 [2022-11-16 16:19:27,257 INFO L187 NwaCegarLoop]: Found error trace [2022-11-16 16:19:27,257 INFO L195 NwaCegarLoop]: trace histogram [14, 13, 13, 6, 4, 4, 4, 4, 4, 4, 4, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-16 16:19:27,268 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_57ae48b7-7ca4-47ad-a8e2-3457df15573e/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (21)] Forceful destruction successful, exit code 0 [2022-11-16 16:19:27,463 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable19,21 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_57ae48b7-7ca4-47ad-a8e2-3457df15573e/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-16 16:19:27,463 INFO L420 AbstractCegarLoop]: === Iteration 21 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-16 16:19:27,463 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-16 16:19:27,464 INFO L85 PathProgramCache]: Analyzing trace with hash -1541942719, now seen corresponding path program 4 times [2022-11-16 16:19:27,464 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-16 16:19:27,464 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [844758131] [2022-11-16 16:19:27,464 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-16 16:19:27,464 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-16 16:19:27,472 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-11-16 16:19:27,473 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1473979921] [2022-11-16 16:19:27,473 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-11-16 16:19:27,473 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-16 16:19:27,473 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_57ae48b7-7ca4-47ad-a8e2-3457df15573e/bin/utaipan-Xvt2sAort0/z3 [2022-11-16 16:19:27,474 INFO L229 MonitoredProcess]: Starting monitored process 22 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_57ae48b7-7ca4-47ad-a8e2-3457df15573e/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-16 16:19:27,479 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_57ae48b7-7ca4-47ad-a8e2-3457df15573e/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (22)] Waiting until timeout for monitored process [2022-11-16 16:19:27,552 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-16 16:19:27,554 INFO L263 TraceCheckSpWp]: Trace formula consists of 310 conjuncts, 23 conjunts are in the unsatisfiable core [2022-11-16 16:19:27,556 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-16 16:19:27,833 INFO L134 CoverageAnalysis]: Checked inductivity of 423 backedges. 96 proven. 50 refuted. 0 times theorem prover too weak. 277 trivial. 0 not checked. [2022-11-16 16:19:27,833 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-16 16:19:28,277 INFO L134 CoverageAnalysis]: Checked inductivity of 423 backedges. 51 proven. 51 refuted. 0 times theorem prover too weak. 321 trivial. 0 not checked. [2022-11-16 16:19:28,277 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-16 16:19:28,277 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [844758131] [2022-11-16 16:19:28,277 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-11-16 16:19:28,277 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1473979921] [2022-11-16 16:19:28,277 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1473979921] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-16 16:19:28,277 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1328637119] [2022-11-16 16:19:28,279 INFO L159 IcfgInterpreter]: Started Sifa with 27 locations of interest [2022-11-16 16:19:28,279 INFO L166 IcfgInterpreter]: Building call graph [2022-11-16 16:19:28,279 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-16 16:19:28,280 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-16 16:19:28,280 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-16 16:19:34,163 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 39 for LOIs [2022-11-16 16:19:34,203 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 59 for LOIs [2022-11-16 16:19:34,217 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-16 16:19:37,218 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '43573#(and (<= |#NULL.offset| 0) (= |__VERIFIER_assert_#in~cond| __VERIFIER_assert_~cond) (= __VERIFIER_assert_~cond 0) (<= 0 |#NULL.offset|) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-16 16:19:37,218 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-16 16:19:37,218 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-11-16 16:19:37,219 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 16] total 26 [2022-11-16 16:19:37,219 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [325580759] [2022-11-16 16:19:37,219 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2022-11-16 16:19:37,219 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 26 states [2022-11-16 16:19:37,219 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-16 16:19:37,220 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2022-11-16 16:19:37,220 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=170, Invalid=1552, Unknown=0, NotChecked=0, Total=1722 [2022-11-16 16:19:37,220 INFO L87 Difference]: Start difference. First operand 1445 states and 2253 transitions. Second operand has 26 states, 25 states have (on average 2.84) internal successors, (71), 24 states have internal predecessors, (71), 10 states have call successors, (33), 2 states have call predecessors, (33), 3 states have return successors, (33), 10 states have call predecessors, (33), 10 states have call successors, (33) [2022-11-16 16:19:50,047 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-16 16:19:50,047 INFO L93 Difference]: Finished difference Result 2721 states and 4271 transitions. [2022-11-16 16:19:50,048 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 94 states. [2022-11-16 16:19:50,048 INFO L78 Accepts]: Start accepts. Automaton has has 26 states, 25 states have (on average 2.84) internal successors, (71), 24 states have internal predecessors, (71), 10 states have call successors, (33), 2 states have call predecessors, (33), 3 states have return successors, (33), 10 states have call predecessors, (33), 10 states have call successors, (33) Word has length 116 [2022-11-16 16:19:50,048 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-16 16:19:50,058 INFO L225 Difference]: With dead ends: 2721 [2022-11-16 16:19:50,058 INFO L226 Difference]: Without dead ends: 2254 [2022-11-16 16:19:50,063 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 436 GetRequests, 279 SyntacticMatches, 27 SemanticMatches, 130 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6474 ImplicationChecksByTransitivity, 8.1s TimeCoverageRelationStatistics Valid=3194, Invalid=14098, Unknown=0, NotChecked=0, Total=17292 [2022-11-16 16:19:50,063 INFO L413 NwaCegarLoop]: 193 mSDtfsCounter, 353 mSDsluCounter, 500 mSDsCounter, 0 mSdLazyCounter, 2089 mSolverCounterSat, 1255 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 3.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 353 SdHoareTripleChecker+Valid, 693 SdHoareTripleChecker+Invalid, 3344 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1255 IncrementalHoareTripleChecker+Valid, 2089 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 3.3s IncrementalHoareTripleChecker+Time [2022-11-16 16:19:50,064 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [353 Valid, 693 Invalid, 3344 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1255 Valid, 2089 Invalid, 0 Unknown, 0 Unchecked, 3.3s Time] [2022-11-16 16:19:50,066 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2254 states. [2022-11-16 16:19:53,108 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2254 to 1685. [2022-11-16 16:19:53,111 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1685 states, 893 states have (on average 1.2777155655095185) internal successors, (1141), 914 states have internal predecessors, (1141), 753 states have call successors, (753), 38 states have call predecessors, (753), 38 states have return successors, (751), 732 states have call predecessors, (751), 751 states have call successors, (751) [2022-11-16 16:19:53,115 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1685 states to 1685 states and 2645 transitions. [2022-11-16 16:19:53,116 INFO L78 Accepts]: Start accepts. Automaton has 1685 states and 2645 transitions. Word has length 116 [2022-11-16 16:19:53,116 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-16 16:19:53,116 INFO L495 AbstractCegarLoop]: Abstraction has 1685 states and 2645 transitions. [2022-11-16 16:19:53,116 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 26 states, 25 states have (on average 2.84) internal successors, (71), 24 states have internal predecessors, (71), 10 states have call successors, (33), 2 states have call predecessors, (33), 3 states have return successors, (33), 10 states have call predecessors, (33), 10 states have call successors, (33) [2022-11-16 16:19:53,116 INFO L276 IsEmpty]: Start isEmpty. Operand 1685 states and 2645 transitions. [2022-11-16 16:19:53,119 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 126 [2022-11-16 16:19:53,119 INFO L187 NwaCegarLoop]: Found error trace [2022-11-16 16:19:53,119 INFO L195 NwaCegarLoop]: trace histogram [17, 16, 16, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 3, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-16 16:19:53,128 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_57ae48b7-7ca4-47ad-a8e2-3457df15573e/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (22)] Forceful destruction successful, exit code 0 [2022-11-16 16:19:53,325 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable20,22 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_57ae48b7-7ca4-47ad-a8e2-3457df15573e/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-16 16:19:53,325 INFO L420 AbstractCegarLoop]: === Iteration 22 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-16 16:19:53,325 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-16 16:19:53,325 INFO L85 PathProgramCache]: Analyzing trace with hash -1702861936, now seen corresponding path program 3 times [2022-11-16 16:19:53,325 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-16 16:19:53,325 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [267444967] [2022-11-16 16:19:53,325 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-16 16:19:53,326 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-16 16:19:53,336 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-11-16 16:19:53,336 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1832868880] [2022-11-16 16:19:53,336 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-11-16 16:19:53,337 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-16 16:19:53,337 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_57ae48b7-7ca4-47ad-a8e2-3457df15573e/bin/utaipan-Xvt2sAort0/z3 [2022-11-16 16:19:53,338 INFO L229 MonitoredProcess]: Starting monitored process 23 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_57ae48b7-7ca4-47ad-a8e2-3457df15573e/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-16 16:19:53,340 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_57ae48b7-7ca4-47ad-a8e2-3457df15573e/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (23)] Waiting until timeout for monitored process [2022-11-16 16:19:53,423 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-11-16 16:19:53,423 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-16 16:19:53,426 INFO L263 TraceCheckSpWp]: Trace formula consists of 282 conjuncts, 97 conjunts are in the unsatisfiable core [2022-11-16 16:19:53,430 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-16 16:19:55,427 INFO L134 CoverageAnalysis]: Checked inductivity of 580 backedges. 36 proven. 101 refuted. 0 times theorem prover too weak. 443 trivial. 0 not checked. [2022-11-16 16:19:55,427 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-16 16:19:59,725 INFO L134 CoverageAnalysis]: Checked inductivity of 580 backedges. 34 proven. 99 refuted. 0 times theorem prover too weak. 447 trivial. 0 not checked. [2022-11-16 16:19:59,725 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-16 16:19:59,725 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [267444967] [2022-11-16 16:19:59,725 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-11-16 16:19:59,725 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1832868880] [2022-11-16 16:19:59,726 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1832868880] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-16 16:19:59,726 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1118779709] [2022-11-16 16:19:59,727 INFO L159 IcfgInterpreter]: Started Sifa with 28 locations of interest [2022-11-16 16:19:59,727 INFO L166 IcfgInterpreter]: Building call graph [2022-11-16 16:19:59,728 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-16 16:19:59,728 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-16 16:19:59,728 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-16 16:20:06,580 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 8 for LOIs [2022-11-16 16:20:06,585 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 59 for LOIs [2022-11-16 16:20:06,603 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-16 16:20:26,209 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '51890#(and (= |__VERIFIER_assert_#in~cond| __VERIFIER_assert_~cond) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-16 16:20:26,209 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-16 16:20:26,210 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-11-16 16:20:26,210 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [21, 19] total 37 [2022-11-16 16:20:26,210 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1809062969] [2022-11-16 16:20:26,210 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2022-11-16 16:20:26,211 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 37 states [2022-11-16 16:20:26,211 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-16 16:20:26,211 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 37 interpolants. [2022-11-16 16:20:26,212 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=314, Invalid=2548, Unknown=0, NotChecked=0, Total=2862 [2022-11-16 16:20:26,212 INFO L87 Difference]: Start difference. First operand 1685 states and 2645 transitions. Second operand has 37 states, 33 states have (on average 2.1515151515151514) internal successors, (71), 33 states have internal predecessors, (71), 14 states have call successors, (40), 3 states have call predecessors, (40), 3 states have return successors, (39), 12 states have call predecessors, (39), 12 states have call successors, (39) [2022-11-16 16:20:41,647 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-11-16 16:20:49,957 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-11-16 16:21:02,145 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-11-16 16:21:09,770 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-11-16 16:21:14,115 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.52s for a HTC check with result INVALID. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-11-16 16:21:25,128 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.01s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-11-16 16:21:32,552 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-11-16 16:21:37,351 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-11-16 16:21:42,788 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-11-16 16:21:55,383 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.03s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-11-16 16:21:57,415 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-16 16:21:57,416 INFO L93 Difference]: Finished difference Result 2046 states and 3171 transitions. [2022-11-16 16:21:57,416 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 57 states. [2022-11-16 16:21:57,417 INFO L78 Accepts]: Start accepts. Automaton has has 37 states, 33 states have (on average 2.1515151515151514) internal successors, (71), 33 states have internal predecessors, (71), 14 states have call successors, (40), 3 states have call predecessors, (40), 3 states have return successors, (39), 12 states have call predecessors, (39), 12 states have call successors, (39) Word has length 125 [2022-11-16 16:21:57,417 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-16 16:21:57,423 INFO L225 Difference]: With dead ends: 2046 [2022-11-16 16:21:57,423 INFO L226 Difference]: Without dead ends: 1515 [2022-11-16 16:21:57,426 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 422 GetRequests, 290 SyntacticMatches, 31 SemanticMatches, 101 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4707 ImplicationChecksByTransitivity, 59.8s TimeCoverageRelationStatistics Valid=1522, Invalid=8984, Unknown=0, NotChecked=0, Total=10506 [2022-11-16 16:21:57,427 INFO L413 NwaCegarLoop]: 42 mSDtfsCounter, 337 mSDsluCounter, 277 mSDsCounter, 0 mSdLazyCounter, 2085 mSolverCounterSat, 531 mSolverCounterUnsat, 9 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 49.9s Time, 0 mProtectedPredicate, 0 mProtectedAction, 341 SdHoareTripleChecker+Valid, 319 SdHoareTripleChecker+Invalid, 2625 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 531 IncrementalHoareTripleChecker+Valid, 2085 IncrementalHoareTripleChecker+Invalid, 9 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 50.1s IncrementalHoareTripleChecker+Time [2022-11-16 16:21:57,427 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [341 Valid, 319 Invalid, 2625 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [531 Valid, 2085 Invalid, 9 Unknown, 0 Unchecked, 50.1s Time] [2022-11-16 16:21:57,429 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1515 states. [2022-11-16 16:22:01,488 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1515 to 1477. [2022-11-16 16:22:01,490 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1477 states, 783 states have (on average 1.2707535121328224) internal successors, (995), 800 states have internal predecessors, (995), 661 states have call successors, (661), 32 states have call predecessors, (661), 32 states have return successors, (659), 644 states have call predecessors, (659), 659 states have call successors, (659) [2022-11-16 16:22:01,495 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1477 states to 1477 states and 2315 transitions. [2022-11-16 16:22:01,496 INFO L78 Accepts]: Start accepts. Automaton has 1477 states and 2315 transitions. Word has length 125 [2022-11-16 16:22:01,496 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-16 16:22:01,496 INFO L495 AbstractCegarLoop]: Abstraction has 1477 states and 2315 transitions. [2022-11-16 16:22:01,497 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 37 states, 33 states have (on average 2.1515151515151514) internal successors, (71), 33 states have internal predecessors, (71), 14 states have call successors, (40), 3 states have call predecessors, (40), 3 states have return successors, (39), 12 states have call predecessors, (39), 12 states have call successors, (39) [2022-11-16 16:22:01,497 INFO L276 IsEmpty]: Start isEmpty. Operand 1477 states and 2315 transitions. [2022-11-16 16:22:01,499 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 126 [2022-11-16 16:22:01,499 INFO L187 NwaCegarLoop]: Found error trace [2022-11-16 16:22:01,499 INFO L195 NwaCegarLoop]: trace histogram [17, 16, 16, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 3, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-16 16:22:01,507 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_57ae48b7-7ca4-47ad-a8e2-3457df15573e/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (23)] Forceful destruction successful, exit code 0 [2022-11-16 16:22:01,704 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable21,23 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_57ae48b7-7ca4-47ad-a8e2-3457df15573e/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-16 16:22:01,704 INFO L420 AbstractCegarLoop]: === Iteration 23 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-16 16:22:01,705 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-16 16:22:01,705 INFO L85 PathProgramCache]: Analyzing trace with hash -1054120344, now seen corresponding path program 4 times [2022-11-16 16:22:01,705 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-16 16:22:01,705 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [243541428] [2022-11-16 16:22:01,705 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-16 16:22:01,705 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-16 16:22:01,714 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-11-16 16:22:01,714 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [910913611] [2022-11-16 16:22:01,715 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-11-16 16:22:01,715 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-16 16:22:01,715 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_57ae48b7-7ca4-47ad-a8e2-3457df15573e/bin/utaipan-Xvt2sAort0/z3 [2022-11-16 16:22:01,716 INFO L229 MonitoredProcess]: Starting monitored process 24 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_57ae48b7-7ca4-47ad-a8e2-3457df15573e/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-16 16:22:01,722 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_57ae48b7-7ca4-47ad-a8e2-3457df15573e/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (24)] Waiting until timeout for monitored process [2022-11-16 16:22:01,806 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-16 16:22:01,809 INFO L263 TraceCheckSpWp]: Trace formula consists of 311 conjuncts, 99 conjunts are in the unsatisfiable core [2022-11-16 16:22:01,812 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-16 16:22:03,533 INFO L134 CoverageAnalysis]: Checked inductivity of 580 backedges. 71 proven. 66 refuted. 0 times theorem prover too weak. 443 trivial. 0 not checked. [2022-11-16 16:22:03,533 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-16 16:22:18,015 INFO L134 CoverageAnalysis]: Checked inductivity of 580 backedges. 70 proven. 63 refuted. 0 times theorem prover too weak. 447 trivial. 0 not checked. [2022-11-16 16:22:18,015 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-16 16:22:18,015 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [243541428] [2022-11-16 16:22:18,015 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-11-16 16:22:18,015 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [910913611] [2022-11-16 16:22:18,015 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [910913611] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-16 16:22:18,015 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1634577035] [2022-11-16 16:22:18,017 INFO L159 IcfgInterpreter]: Started Sifa with 28 locations of interest [2022-11-16 16:22:18,017 INFO L166 IcfgInterpreter]: Building call graph [2022-11-16 16:22:18,017 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-16 16:22:18,017 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-16 16:22:18,017 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-16 16:22:23,866 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 39 for LOIs [2022-11-16 16:22:23,909 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 59 for LOIs [2022-11-16 16:22:23,921 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-16 16:22:44,577 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '58647#(and (= |__VERIFIER_assert_#in~cond| __VERIFIER_assert_~cond) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-16 16:22:44,577 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-16 16:22:44,577 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-11-16 16:22:44,577 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [22, 19] total 38 [2022-11-16 16:22:44,577 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [643928326] [2022-11-16 16:22:44,577 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2022-11-16 16:22:44,578 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 38 states [2022-11-16 16:22:44,578 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-16 16:22:44,579 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 38 interpolants. [2022-11-16 16:22:44,579 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=337, Invalid=2633, Unknown=0, NotChecked=0, Total=2970 [2022-11-16 16:22:44,579 INFO L87 Difference]: Start difference. First operand 1477 states and 2315 transitions. Second operand has 38 states, 35 states have (on average 2.057142857142857) internal successors, (72), 36 states have internal predecessors, (72), 14 states have call successors, (41), 3 states have call predecessors, (41), 3 states have return successors, (40), 12 states have call predecessors, (40), 12 states have call successors, (40) [2022-11-16 16:22:47,988 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.44s for a HTC check with result INVALID. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-11-16 16:23:17,407 WARN L233 SmtUtils]: Spent 6.54s on a formula simplification that was a NOOP. DAG size: 122 (called from [L 360] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2022-11-16 16:23:18,751 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.31s for a HTC check with result INVALID. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-11-16 16:23:22,245 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-11-16 16:23:24,248 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-11-16 16:23:26,744 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-11-16 16:23:32,811 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-11-16 16:23:34,940 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.05s for a HTC check with result INVALID. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-11-16 16:23:49,002 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-11-16 16:23:58,231 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.44s for a HTC check with result INVALID. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-11-16 16:24:01,385 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-11-16 16:24:03,440 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-11-16 16:24:06,746 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-11-16 16:24:14,988 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-11-16 16:24:29,433 WARN L233 SmtUtils]: Spent 7.07s on a formula simplification that was a NOOP. DAG size: 102 (called from [L 360] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2022-11-16 16:24:31,517 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-11-16 16:24:33,812 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-11-16 16:24:37,256 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-11-16 16:24:39,999 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.81s for a HTC check with result INVALID. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-11-16 16:24:47,695 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-11-16 16:25:03,953 WARN L233 SmtUtils]: Spent 7.86s on a formula simplification that was a NOOP. DAG size: 121 (called from [L 360] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2022-11-16 16:25:05,975 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-11-16 16:25:09,686 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers []