./Ultimate.py --spec ../../sv-benchmarks/c/properties/valid-memsafety.prp --file ../../sv-benchmarks/c/array-memsafety/openbsd_cmemchr-alloca-2.i --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for memory safety (deref-memtrack) Using default analysis Version 5e519f3a 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_81634ae4-27af-40ae-86b0-f7d8326dcf83/bin/utaipan-7li7fVZpFI/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_81634ae4-27af-40ae-86b0-f7d8326dcf83/bin/utaipan-7li7fVZpFI/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_81634ae4-27af-40ae-86b0-f7d8326dcf83/bin/utaipan-7li7fVZpFI/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_81634ae4-27af-40ae-86b0-f7d8326dcf83/bin/utaipan-7li7fVZpFI/config/TaipanMemDerefMemtrack.xml -i ../../sv-benchmarks/c/array-memsafety/openbsd_cmemchr-alloca-2.i -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_81634ae4-27af-40ae-86b0-f7d8326dcf83/bin/utaipan-7li7fVZpFI/config/svcomp-DerefFreeMemtrack-32bit-Taipan_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_81634ae4-27af-40ae-86b0-f7d8326dcf83/bin/utaipan-7li7fVZpFI --witnessprinter.witness.filename witness.graphml --witnessprinter.write.witness.besides.input.file false --witnessprinter.graph.data.specification CHECK( init(main()), LTL(G valid-free) ) CHECK( init(main()), LTL(G valid-deref) ) CHECK( init(main()), LTL(G valid-memtrack) ) --witnessprinter.graph.data.producer Taipan --witnessprinter.graph.data.architecture 32bit --witnessprinter.graph.data.programhash 007fc8a389a67fb47c7d326d3f1d284696dfe5de13661e77d6d1bf7cce285194 --- 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-5e519f3 [2022-11-03 02:06:29,665 INFO L177 SettingsManager]: Resetting all preferences to default values... [2022-11-03 02:06:29,668 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2022-11-03 02:06:29,704 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2022-11-03 02:06:29,705 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2022-11-03 02:06:29,706 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2022-11-03 02:06:29,708 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2022-11-03 02:06:29,710 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2022-11-03 02:06:29,712 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2022-11-03 02:06:29,713 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2022-11-03 02:06:29,714 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2022-11-03 02:06:29,716 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2022-11-03 02:06:29,716 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2022-11-03 02:06:29,718 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2022-11-03 02:06:29,719 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2022-11-03 02:06:29,721 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2022-11-03 02:06:29,722 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2022-11-03 02:06:29,723 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2022-11-03 02:06:29,725 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2022-11-03 02:06:29,727 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2022-11-03 02:06:29,729 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2022-11-03 02:06:29,736 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2022-11-03 02:06:29,737 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2022-11-03 02:06:29,738 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2022-11-03 02:06:29,743 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2022-11-03 02:06:29,743 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2022-11-03 02:06:29,744 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2022-11-03 02:06:29,745 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2022-11-03 02:06:29,745 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2022-11-03 02:06:29,746 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2022-11-03 02:06:29,747 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2022-11-03 02:06:29,748 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2022-11-03 02:06:29,759 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2022-11-03 02:06:29,760 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2022-11-03 02:06:29,761 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2022-11-03 02:06:29,762 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2022-11-03 02:06:29,762 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2022-11-03 02:06:29,763 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2022-11-03 02:06:29,763 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2022-11-03 02:06:29,764 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2022-11-03 02:06:29,764 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2022-11-03 02:06:29,767 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_81634ae4-27af-40ae-86b0-f7d8326dcf83/bin/utaipan-7li7fVZpFI/config/svcomp-DerefFreeMemtrack-32bit-Taipan_Default.epf [2022-11-03 02:06:29,828 INFO L113 SettingsManager]: Loading preferences was successful [2022-11-03 02:06:29,828 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2022-11-03 02:06:29,832 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2022-11-03 02:06:29,833 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2022-11-03 02:06:29,833 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2022-11-03 02:06:29,834 INFO L138 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2022-11-03 02:06:29,834 INFO L138 SettingsManager]: * User list type=DISABLED [2022-11-03 02:06:29,834 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2022-11-03 02:06:29,834 INFO L138 SettingsManager]: * Explicit value domain=true [2022-11-03 02:06:29,835 INFO L138 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2022-11-03 02:06:29,835 INFO L138 SettingsManager]: * Octagon Domain=false [2022-11-03 02:06:29,835 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2022-11-03 02:06:29,835 INFO L138 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2022-11-03 02:06:29,836 INFO L138 SettingsManager]: * Use the RCFG-of-the-future interface=true [2022-11-03 02:06:29,836 INFO L138 SettingsManager]: * Interval Domain=false [2022-11-03 02:06:29,836 INFO L136 SettingsManager]: Preferences of Sifa differ from their defaults: [2022-11-03 02:06:29,836 INFO L138 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2022-11-03 02:06:29,837 INFO L138 SettingsManager]: * Simplification Technique=POLY_PAC [2022-11-03 02:06:29,837 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2022-11-03 02:06:29,838 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2022-11-03 02:06:29,838 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2022-11-03 02:06:29,838 INFO L138 SettingsManager]: * sizeof long=4 [2022-11-03 02:06:29,838 INFO L138 SettingsManager]: * Check unreachability of error function in SV-COMP mode=false [2022-11-03 02:06:29,839 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2022-11-03 02:06:29,839 INFO L138 SettingsManager]: * sizeof POINTER=4 [2022-11-03 02:06:29,839 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2022-11-03 02:06:29,839 INFO L138 SettingsManager]: * Check for the main procedure if all allocated memory was freed=true [2022-11-03 02:06:29,839 INFO L138 SettingsManager]: * Bitprecise bitfields=true [2022-11-03 02:06:29,840 INFO L138 SettingsManager]: * SV-COMP memtrack compatibility mode=true [2022-11-03 02:06:29,840 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2022-11-03 02:06:29,840 INFO L138 SettingsManager]: * Adapt memory model on pointer casts if necessary=true [2022-11-03 02:06:29,840 INFO L138 SettingsManager]: * sizeof long double=12 [2022-11-03 02:06:29,841 INFO L138 SettingsManager]: * Use constant arrays=true [2022-11-03 02:06:29,841 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2022-11-03 02:06:29,841 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2022-11-03 02:06:29,841 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2022-11-03 02:06:29,842 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2022-11-03 02:06:29,842 INFO L138 SettingsManager]: * Abstract interpretation Mode=USE_PREDICATES [2022-11-03 02:06:29,842 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2022-11-03 02:06:29,842 INFO L138 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2022-11-03 02:06:29,843 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2022-11-03 02:06:29,843 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2022-11-03 02:06:29,843 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_81634ae4-27af-40ae-86b0-f7d8326dcf83/bin/utaipan-7li7fVZpFI/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_81634ae4-27af-40ae-86b0-f7d8326dcf83/bin/utaipan-7li7fVZpFI Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G valid-free) ) CHECK( init(main()), LTL(G valid-deref) ) CHECK( init(main()), LTL(G valid-memtrack) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> 007fc8a389a67fb47c7d326d3f1d284696dfe5de13661e77d6d1bf7cce285194 [2022-11-03 02:06:30,148 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2022-11-03 02:06:30,182 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2022-11-03 02:06:30,187 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2022-11-03 02:06:30,189 INFO L271 PluginConnector]: Initializing CDTParser... [2022-11-03 02:06:30,190 INFO L275 PluginConnector]: CDTParser initialized [2022-11-03 02:06:30,192 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_81634ae4-27af-40ae-86b0-f7d8326dcf83/bin/utaipan-7li7fVZpFI/../../sv-benchmarks/c/array-memsafety/openbsd_cmemchr-alloca-2.i [2022-11-03 02:06:30,262 INFO L220 CDTParser]: Created temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_81634ae4-27af-40ae-86b0-f7d8326dcf83/bin/utaipan-7li7fVZpFI/data/f423f14a5/9aeba31e4ec145b89a8f4e365ce72484/FLAG22b407614 [2022-11-03 02:06:30,883 INFO L306 CDTParser]: Found 1 translation units. [2022-11-03 02:06:30,884 INFO L160 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_81634ae4-27af-40ae-86b0-f7d8326dcf83/sv-benchmarks/c/array-memsafety/openbsd_cmemchr-alloca-2.i [2022-11-03 02:06:30,899 INFO L349 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_81634ae4-27af-40ae-86b0-f7d8326dcf83/bin/utaipan-7li7fVZpFI/data/f423f14a5/9aeba31e4ec145b89a8f4e365ce72484/FLAG22b407614 [2022-11-03 02:06:31,170 INFO L357 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_81634ae4-27af-40ae-86b0-f7d8326dcf83/bin/utaipan-7li7fVZpFI/data/f423f14a5/9aeba31e4ec145b89a8f4e365ce72484 [2022-11-03 02:06:31,173 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2022-11-03 02:06:31,175 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2022-11-03 02:06:31,177 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2022-11-03 02:06:31,177 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2022-11-03 02:06:31,181 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2022-11-03 02:06:31,182 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 03.11 02:06:31" (1/1) ... [2022-11-03 02:06:31,184 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@4aa4b8ac and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 03.11 02:06:31, skipping insertion in model container [2022-11-03 02:06:31,184 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 03.11 02:06:31" (1/1) ... [2022-11-03 02:06:31,193 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2022-11-03 02:06:31,239 INFO L178 MainTranslator]: Built tables and reachable declarations [2022-11-03 02:06:31,772 INFO L210 PostProcessor]: Analyzing one entry point: main [2022-11-03 02:06:31,785 INFO L203 MainTranslator]: Completed pre-run [2022-11-03 02:06:31,851 INFO L210 PostProcessor]: Analyzing one entry point: main [2022-11-03 02:06:31,882 INFO L208 MainTranslator]: Completed translation [2022-11-03 02:06:31,883 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 03.11 02:06:31 WrapperNode [2022-11-03 02:06:31,883 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2022-11-03 02:06:31,885 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2022-11-03 02:06:31,885 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2022-11-03 02:06:31,885 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2022-11-03 02:06:31,895 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 03.11 02:06:31" (1/1) ... [2022-11-03 02:06:31,925 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 03.11 02:06:31" (1/1) ... [2022-11-03 02:06:31,958 INFO L138 Inliner]: procedures = 117, calls = 8, calls flagged for inlining = 3, calls inlined = 3, statements flattened = 64 [2022-11-03 02:06:31,959 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2022-11-03 02:06:31,960 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2022-11-03 02:06:31,961 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2022-11-03 02:06:31,961 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2022-11-03 02:06:31,971 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 03.11 02:06:31" (1/1) ... [2022-11-03 02:06:31,972 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 03.11 02:06:31" (1/1) ... [2022-11-03 02:06:31,986 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 03.11 02:06:31" (1/1) ... [2022-11-03 02:06:31,986 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 03.11 02:06:31" (1/1) ... [2022-11-03 02:06:31,991 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 03.11 02:06:31" (1/1) ... [2022-11-03 02:06:32,003 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 03.11 02:06:31" (1/1) ... [2022-11-03 02:06:32,004 INFO L185 PluginConnector]: Executing the observer LTLStepAnnotator from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 03.11 02:06:31" (1/1) ... [2022-11-03 02:06:32,012 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 03.11 02:06:31" (1/1) ... [2022-11-03 02:06:32,015 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2022-11-03 02:06:32,023 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2022-11-03 02:06:32,023 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2022-11-03 02:06:32,024 INFO L275 PluginConnector]: RCFGBuilder initialized [2022-11-03 02:06:32,025 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 03.11 02:06:31" (1/1) ... [2022-11-03 02:06:32,034 INFO L173 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2022-11-03 02:06:32,048 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_81634ae4-27af-40ae-86b0-f7d8326dcf83/bin/utaipan-7li7fVZpFI/z3 [2022-11-03 02:06:32,067 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_81634ae4-27af-40ae-86b0-f7d8326dcf83/bin/utaipan-7li7fVZpFI/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2022-11-03 02:06:32,086 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_81634ae4-27af-40ae-86b0-f7d8326dcf83/bin/utaipan-7li7fVZpFI/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2022-11-03 02:06:32,124 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2022-11-03 02:06:32,124 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2022-11-03 02:06:32,125 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2022-11-03 02:06:32,125 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2022-11-03 02:06:32,125 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2022-11-03 02:06:32,125 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2022-11-03 02:06:32,243 INFO L235 CfgBuilder]: Building ICFG [2022-11-03 02:06:32,245 INFO L261 CfgBuilder]: Building CFG for each procedure with an implementation [2022-11-03 02:06:32,416 INFO L276 CfgBuilder]: Performing block encoding [2022-11-03 02:06:32,544 INFO L295 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2022-11-03 02:06:32,544 INFO L300 CfgBuilder]: Removed 2 assume(true) statements. [2022-11-03 02:06:32,547 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 03.11 02:06:32 BoogieIcfgContainer [2022-11-03 02:06:32,547 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2022-11-03 02:06:32,550 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2022-11-03 02:06:32,550 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2022-11-03 02:06:32,554 INFO L275 PluginConnector]: TraceAbstraction initialized [2022-11-03 02:06:32,555 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 03.11 02:06:31" (1/3) ... [2022-11-03 02:06:32,556 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@133a6a92 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 03.11 02:06:32, skipping insertion in model container [2022-11-03 02:06:32,556 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 03.11 02:06:31" (2/3) ... [2022-11-03 02:06:32,556 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@133a6a92 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 03.11 02:06:32, skipping insertion in model container [2022-11-03 02:06:32,557 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 03.11 02:06:32" (3/3) ... [2022-11-03 02:06:32,558 INFO L112 eAbstractionObserver]: Analyzing ICFG openbsd_cmemchr-alloca-2.i [2022-11-03 02:06:32,582 INFO L203 ceAbstractionStarter]: Automizer settings: Hoare:false NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2022-11-03 02:06:32,582 INFO L162 ceAbstractionStarter]: Applying trace abstraction to program that has 5 error locations. [2022-11-03 02:06:32,637 INFO L356 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2022-11-03 02:06:32,645 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=false, mAutomataTypeConcurrency=FINITE_AUTOMATA, mHoareTripleChecks=INCREMENTAL, mHoareAnnotationPositions=All, 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;@3a2765f2, mLbeIndependenceSettings=[IndependenceType=SEMANTIC, AbstractionType=NONE, UseConditional=false, UseSemiCommutativity=true, Solver=Z3, SolverTimeout=1000ms] [2022-11-03 02:06:32,645 INFO L358 AbstractCegarLoop]: Starting to check reachability of 5 error locations. [2022-11-03 02:06:32,650 INFO L276 IsEmpty]: Start isEmpty. Operand has 17 states, 11 states have (on average 1.9090909090909092) internal successors, (21), 16 states have internal predecessors, (21), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 02:06:32,658 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 4 [2022-11-03 02:06:32,658 INFO L187 NwaCegarLoop]: Found error trace [2022-11-03 02:06:32,659 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1] [2022-11-03 02:06:32,660 INFO L420 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 2 more)] === [2022-11-03 02:06:32,666 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-03 02:06:32,667 INFO L85 PathProgramCache]: Analyzing trace with hash 107409, now seen corresponding path program 1 times [2022-11-03 02:06:32,679 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-03 02:06:32,680 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1409815262] [2022-11-03 02:06:32,680 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-03 02:06:32,681 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-03 02:06:32,888 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-03 02:06:33,048 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-03 02:06:33,048 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-03 02:06:33,049 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1409815262] [2022-11-03 02:06:33,050 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1409815262] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-03 02:06:33,050 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-11-03 02:06:33,051 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [1] imperfect sequences [] total 1 [2022-11-03 02:06:33,052 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1488884323] [2022-11-03 02:06:33,054 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-03 02:06:33,059 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2022-11-03 02:06:33,059 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-03 02:06:33,124 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2022-11-03 02:06:33,125 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2022-11-03 02:06:33,128 INFO L87 Difference]: Start difference. First operand has 17 states, 11 states have (on average 1.9090909090909092) internal successors, (21), 16 states have internal predecessors, (21), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Second operand has 3 states, 2 states have (on average 1.5) internal successors, (3), 2 states have internal predecessors, (3), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 02:06:33,223 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-03 02:06:33,224 INFO L93 Difference]: Finished difference Result 16 states and 19 transitions. [2022-11-03 02:06:33,240 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2022-11-03 02:06:33,242 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 2 states have (on average 1.5) internal successors, (3), 2 states have internal predecessors, (3), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 3 [2022-11-03 02:06:33,242 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-03 02:06:33,251 INFO L225 Difference]: With dead ends: 16 [2022-11-03 02:06:33,252 INFO L226 Difference]: Without dead ends: 15 [2022-11-03 02:06:33,254 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 1 GetRequests, 0 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2022-11-03 02:06:33,260 INFO L413 NwaCegarLoop]: 10 mSDtfsCounter, 14 mSDsluCounter, 0 mSDsCounter, 0 mSdLazyCounter, 12 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 14 SdHoareTripleChecker+Valid, 10 SdHoareTripleChecker+Invalid, 12 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 12 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-11-03 02:06:33,261 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [14 Valid, 10 Invalid, 12 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 12 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-11-03 02:06:33,298 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 15 states. [2022-11-03 02:06:33,310 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 15 to 15. [2022-11-03 02:06:33,311 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 15 states, 11 states have (on average 1.6363636363636365) internal successors, (18), 14 states have internal predecessors, (18), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 02:06:33,312 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 15 states to 15 states and 18 transitions. [2022-11-03 02:06:33,314 INFO L78 Accepts]: Start accepts. Automaton has 15 states and 18 transitions. Word has length 3 [2022-11-03 02:06:33,314 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-03 02:06:33,314 INFO L495 AbstractCegarLoop]: Abstraction has 15 states and 18 transitions. [2022-11-03 02:06:33,315 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 2 states have (on average 1.5) internal successors, (3), 2 states have internal predecessors, (3), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 02:06:33,315 INFO L276 IsEmpty]: Start isEmpty. Operand 15 states and 18 transitions. [2022-11-03 02:06:33,316 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 4 [2022-11-03 02:06:33,316 INFO L187 NwaCegarLoop]: Found error trace [2022-11-03 02:06:33,316 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1] [2022-11-03 02:06:33,316 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2022-11-03 02:06:33,317 INFO L420 AbstractCegarLoop]: === Iteration 2 === Targeting ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 2 more)] === [2022-11-03 02:06:33,323 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-03 02:06:33,323 INFO L85 PathProgramCache]: Analyzing trace with hash 107410, now seen corresponding path program 1 times [2022-11-03 02:06:33,324 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-03 02:06:33,325 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [786576585] [2022-11-03 02:06:33,325 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-03 02:06:33,326 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-03 02:06:33,384 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-03 02:06:33,807 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-03 02:06:33,807 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-03 02:06:33,808 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [786576585] [2022-11-03 02:06:33,808 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [786576585] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-03 02:06:33,808 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-11-03 02:06:33,809 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2022-11-03 02:06:33,809 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [823008340] [2022-11-03 02:06:33,810 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-03 02:06:33,811 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2022-11-03 02:06:33,811 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-03 02:06:33,812 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2022-11-03 02:06:33,813 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2022-11-03 02:06:33,813 INFO L87 Difference]: Start difference. First operand 15 states and 18 transitions. Second operand has 4 states, 3 states have (on average 1.0) internal successors, (3), 3 states have internal predecessors, (3), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 02:06:33,908 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-03 02:06:33,909 INFO L93 Difference]: Finished difference Result 28 states and 34 transitions. [2022-11-03 02:06:33,909 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2022-11-03 02:06:33,910 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 3 states have (on average 1.0) internal successors, (3), 3 states have internal predecessors, (3), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 3 [2022-11-03 02:06:33,910 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-03 02:06:33,912 INFO L225 Difference]: With dead ends: 28 [2022-11-03 02:06:33,912 INFO L226 Difference]: Without dead ends: 28 [2022-11-03 02:06:33,918 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 0 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2022-11-03 02:06:33,920 INFO L413 NwaCegarLoop]: 11 mSDtfsCounter, 29 mSDsluCounter, 22 mSDsCounter, 0 mSdLazyCounter, 21 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 29 SdHoareTripleChecker+Valid, 31 SdHoareTripleChecker+Invalid, 22 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 21 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-11-03 02:06:33,922 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [29 Valid, 31 Invalid, 22 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 21 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-11-03 02:06:33,925 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 28 states. [2022-11-03 02:06:33,933 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 28 to 17. [2022-11-03 02:06:33,935 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 17 states, 13 states have (on average 1.6153846153846154) internal successors, (21), 16 states have internal predecessors, (21), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 02:06:33,939 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 17 states to 17 states and 21 transitions. [2022-11-03 02:06:33,940 INFO L78 Accepts]: Start accepts. Automaton has 17 states and 21 transitions. Word has length 3 [2022-11-03 02:06:33,940 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-03 02:06:33,941 INFO L495 AbstractCegarLoop]: Abstraction has 17 states and 21 transitions. [2022-11-03 02:06:33,941 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 3 states have (on average 1.0) internal successors, (3), 3 states have internal predecessors, (3), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 02:06:33,942 INFO L276 IsEmpty]: Start isEmpty. Operand 17 states and 21 transitions. [2022-11-03 02:06:33,944 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 6 [2022-11-03 02:06:33,944 INFO L187 NwaCegarLoop]: Found error trace [2022-11-03 02:06:33,944 INFO L195 NwaCegarLoop]: trace histogram [2, 1, 1, 1] [2022-11-03 02:06:33,951 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2022-11-03 02:06:33,951 INFO L420 AbstractCegarLoop]: === Iteration 3 === Targeting ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 2 more)] === [2022-11-03 02:06:33,952 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-03 02:06:33,958 INFO L85 PathProgramCache]: Analyzing trace with hash 103264033, now seen corresponding path program 1 times [2022-11-03 02:06:33,959 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-03 02:06:33,959 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [156561199] [2022-11-03 02:06:33,959 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-03 02:06:33,960 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-03 02:06:33,990 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-03 02:06:34,354 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-03 02:06:34,355 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-03 02:06:34,355 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [156561199] [2022-11-03 02:06:34,355 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [156561199] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-03 02:06:34,356 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1432219258] [2022-11-03 02:06:34,356 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-03 02:06:34,356 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-03 02:06:34,357 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_81634ae4-27af-40ae-86b0-f7d8326dcf83/bin/utaipan-7li7fVZpFI/z3 [2022-11-03 02:06:34,359 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_81634ae4-27af-40ae-86b0-f7d8326dcf83/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-03 02:06:34,366 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_81634ae4-27af-40ae-86b0-f7d8326dcf83/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2022-11-03 02:06:34,467 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-03 02:06:34,469 INFO L263 TraceCheckSpWp]: Trace formula consists of 53 conjuncts, 18 conjunts are in the unsatisfiable core [2022-11-03 02:06:34,476 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-03 02:06:34,637 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 8 treesize of output 7 [2022-11-03 02:06:34,914 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-03 02:06:34,914 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-03 02:06:35,088 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-03 02:06:35,088 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1432219258] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-03 02:06:35,091 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [623395352] [2022-11-03 02:06:35,123 INFO L159 IcfgInterpreter]: Started Sifa with 4 locations of interest [2022-11-03 02:06:35,123 INFO L166 IcfgInterpreter]: Building call graph [2022-11-03 02:06:35,131 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-03 02:06:35,140 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-03 02:06:35,141 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-03 02:06:35,218 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 8 treesize of output 7 [2022-11-03 02:06:35,322 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2022-11-03 02:06:35,422 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-11-03 02:06:35,447 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-03 02:06:35,773 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '140#(and (<= |ULTIMATE.start_main_~length~0#1| 2147483647) (<= |ULTIMATE.start_main_~n~0#1| 2147483647) (not (<= (+ |ULTIMATE.start_main_~i~0#1| |ULTIMATE.start_main_~nondetArea~0#1.offset| 1) (select |#length| |ULTIMATE.start_main_~nondetArea~0#1.base|))) (= |ULTIMATE.start_main_#t~malloc8#1.offset| 0) (<= |ULTIMATE.start_main_#t~nondet10#1| 127) (<= 0 |ULTIMATE.start_main_~nondetArea~0#1.offset|) (<= 0 |ULTIMATE.start_main_~nondetArea~0#1.base|) (<= |ULTIMATE.start_main_~c~0#1| 2147483647) (< |ULTIMATE.start_main_~i~0#1| |ULTIMATE.start_main_~n~0#1|) (<= 0 |ULTIMATE.start_main_#t~malloc8#1.base|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (<= 1 |ULTIMATE.start_main_~length~0#1|) (<= 0 (+ 128 |ULTIMATE.start_main_#t~nondet10#1|)) (= |#NULL.offset| 0) (<= 0 (+ |ULTIMATE.start_main_~c~0#1| 2147483648)) (<= |ULTIMATE.start_main_~nondetArea~0#1.offset| 0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-03 02:06:35,773 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-03 02:06:35,774 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-03 02:06:35,774 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [3, 3, 3] total 9 [2022-11-03 02:06:35,774 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1862461548] [2022-11-03 02:06:35,774 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-03 02:06:35,775 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 11 states [2022-11-03 02:06:35,775 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-03 02:06:35,775 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2022-11-03 02:06:35,776 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=45, Invalid=137, Unknown=0, NotChecked=0, Total=182 [2022-11-03 02:06:35,776 INFO L87 Difference]: Start difference. First operand 17 states and 21 transitions. Second operand has 11 states, 10 states have (on average 1.5) internal successors, (15), 10 states have internal predecessors, (15), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 02:06:35,991 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-03 02:06:35,991 INFO L93 Difference]: Finished difference Result 29 states and 35 transitions. [2022-11-03 02:06:35,992 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2022-11-03 02:06:35,992 INFO L78 Accepts]: Start accepts. Automaton has has 11 states, 10 states have (on average 1.5) internal successors, (15), 10 states have internal predecessors, (15), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 5 [2022-11-03 02:06:35,992 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-03 02:06:35,993 INFO L225 Difference]: With dead ends: 29 [2022-11-03 02:06:35,993 INFO L226 Difference]: Without dead ends: 29 [2022-11-03 02:06:35,994 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 18 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 44 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=62, Invalid=178, Unknown=0, NotChecked=0, Total=240 [2022-11-03 02:06:35,995 INFO L413 NwaCegarLoop]: 10 mSDtfsCounter, 60 mSDsluCounter, 55 mSDsCounter, 0 mSdLazyCounter, 50 mSolverCounterSat, 8 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 60 SdHoareTripleChecker+Valid, 60 SdHoareTripleChecker+Invalid, 58 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 8 IncrementalHoareTripleChecker+Valid, 50 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-11-03 02:06:35,995 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [60 Valid, 60 Invalid, 58 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [8 Valid, 50 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-11-03 02:06:35,996 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 29 states. [2022-11-03 02:06:35,998 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 29 to 15. [2022-11-03 02:06:35,998 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 15 states, 12 states have (on average 1.5) internal successors, (18), 14 states have internal predecessors, (18), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 02:06:35,999 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 15 states to 15 states and 18 transitions. [2022-11-03 02:06:35,999 INFO L78 Accepts]: Start accepts. Automaton has 15 states and 18 transitions. Word has length 5 [2022-11-03 02:06:35,999 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-03 02:06:35,999 INFO L495 AbstractCegarLoop]: Abstraction has 15 states and 18 transitions. [2022-11-03 02:06:35,999 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 11 states, 10 states have (on average 1.5) internal successors, (15), 10 states have internal predecessors, (15), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 02:06:36,000 INFO L276 IsEmpty]: Start isEmpty. Operand 15 states and 18 transitions. [2022-11-03 02:06:36,000 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 8 [2022-11-03 02:06:36,001 INFO L187 NwaCegarLoop]: Found error trace [2022-11-03 02:06:36,001 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1] [2022-11-03 02:06:36,052 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_81634ae4-27af-40ae-86b0-f7d8326dcf83/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0 [2022-11-03 02:06:36,202 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2,2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_81634ae4-27af-40ae-86b0-f7d8326dcf83/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-03 02:06:36,202 INFO L420 AbstractCegarLoop]: === Iteration 4 === Targeting ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 2 more)] === [2022-11-03 02:06:36,202 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-03 02:06:36,203 INFO L85 PathProgramCache]: Analyzing trace with hash 454047929, now seen corresponding path program 1 times [2022-11-03 02:06:36,203 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-03 02:06:36,203 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1941614513] [2022-11-03 02:06:36,203 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-03 02:06:36,203 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-03 02:06:36,243 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-03 02:06:36,341 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 1 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-03 02:06:36,342 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-03 02:06:36,342 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1941614513] [2022-11-03 02:06:36,342 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1941614513] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-03 02:06:36,343 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-11-03 02:06:36,343 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2022-11-03 02:06:36,343 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2024357831] [2022-11-03 02:06:36,343 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-03 02:06:36,344 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2022-11-03 02:06:36,344 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-03 02:06:36,344 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2022-11-03 02:06:36,345 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2022-11-03 02:06:36,345 INFO L87 Difference]: Start difference. First operand 15 states and 18 transitions. Second operand has 6 states, 5 states have (on average 1.4) internal successors, (7), 6 states have internal predecessors, (7), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 02:06:36,438 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-03 02:06:36,439 INFO L93 Difference]: Finished difference Result 16 states and 19 transitions. [2022-11-03 02:06:36,439 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2022-11-03 02:06:36,440 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 5 states have (on average 1.4) internal successors, (7), 6 states have internal predecessors, (7), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 7 [2022-11-03 02:06:36,440 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-03 02:06:36,441 INFO L225 Difference]: With dead ends: 16 [2022-11-03 02:06:36,441 INFO L226 Difference]: Without dead ends: 16 [2022-11-03 02:06:36,441 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 8 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=27, Invalid=45, Unknown=0, NotChecked=0, Total=72 [2022-11-03 02:06:36,446 INFO L413 NwaCegarLoop]: 7 mSDtfsCounter, 26 mSDsluCounter, 10 mSDsCounter, 0 mSdLazyCounter, 34 mSolverCounterSat, 7 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 26 SdHoareTripleChecker+Valid, 17 SdHoareTripleChecker+Invalid, 41 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 7 IncrementalHoareTripleChecker+Valid, 34 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-11-03 02:06:36,448 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [26 Valid, 17 Invalid, 41 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [7 Valid, 34 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-11-03 02:06:36,450 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 16 states. [2022-11-03 02:06:36,454 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 16 to 14. [2022-11-03 02:06:36,454 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 14 states, 12 states have (on average 1.4166666666666667) internal successors, (17), 13 states have internal predecessors, (17), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 02:06:36,455 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 14 states to 14 states and 17 transitions. [2022-11-03 02:06:36,455 INFO L78 Accepts]: Start accepts. Automaton has 14 states and 17 transitions. Word has length 7 [2022-11-03 02:06:36,455 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-03 02:06:36,456 INFO L495 AbstractCegarLoop]: Abstraction has 14 states and 17 transitions. [2022-11-03 02:06:36,456 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 5 states have (on average 1.4) internal successors, (7), 6 states have internal predecessors, (7), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 02:06:36,456 INFO L276 IsEmpty]: Start isEmpty. Operand 14 states and 17 transitions. [2022-11-03 02:06:36,458 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 8 [2022-11-03 02:06:36,458 INFO L187 NwaCegarLoop]: Found error trace [2022-11-03 02:06:36,459 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1] [2022-11-03 02:06:36,459 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2022-11-03 02:06:36,459 INFO L420 AbstractCegarLoop]: === Iteration 5 === Targeting ULTIMATE.startErr3REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 2 more)] === [2022-11-03 02:06:36,461 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-03 02:06:36,465 INFO L85 PathProgramCache]: Analyzing trace with hash 454047930, now seen corresponding path program 1 times [2022-11-03 02:06:36,466 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-03 02:06:36,466 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1898196086] [2022-11-03 02:06:36,466 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-03 02:06:36,466 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-03 02:06:36,498 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-03 02:06:36,705 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-03 02:06:36,705 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-03 02:06:36,705 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1898196086] [2022-11-03 02:06:36,706 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1898196086] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-03 02:06:36,710 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [317070605] [2022-11-03 02:06:36,710 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-03 02:06:36,711 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-03 02:06:36,711 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_81634ae4-27af-40ae-86b0-f7d8326dcf83/bin/utaipan-7li7fVZpFI/z3 [2022-11-03 02:06:36,712 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_81634ae4-27af-40ae-86b0-f7d8326dcf83/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-03 02:06:36,722 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_81634ae4-27af-40ae-86b0-f7d8326dcf83/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2022-11-03 02:06:36,792 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-03 02:06:36,794 INFO L263 TraceCheckSpWp]: Trace formula consists of 80 conjuncts, 23 conjunts are in the unsatisfiable core [2022-11-03 02:06:36,796 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-03 02:06:36,871 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-03 02:06:36,872 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-03 02:06:36,903 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 21 treesize of output 17 [2022-11-03 02:06:36,930 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-03 02:06:36,931 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [317070605] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-03 02:06:36,931 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [575967374] [2022-11-03 02:06:36,933 INFO L159 IcfgInterpreter]: Started Sifa with 7 locations of interest [2022-11-03 02:06:36,934 INFO L166 IcfgInterpreter]: Building call graph [2022-11-03 02:06:36,934 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-03 02:06:36,934 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-03 02:06:36,935 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-03 02:06:36,977 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 8 treesize of output 7 [2022-11-03 02:06:37,023 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-11-03 02:06:37,088 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-11-03 02:06:37,135 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-03 02:06:38,041 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '277#(and (<= |ULTIMATE.start_main_~length~0#1| 2147483647) (<= |ULTIMATE.start_main_~n~0#1| 2147483647) (= |ULTIMATE.start_cmemchr_#in~s#1.base| |ULTIMATE.start_main_~nondetArea~0#1.base|) (= |ULTIMATE.start_main_#t~malloc8#1.offset| 0) (= |ULTIMATE.start_cmemchr_#in~n#1| |ULTIMATE.start_main_~n~0#1|) (<= 0 |ULTIMATE.start_main_~nondetArea~0#1.offset|) (= |ULTIMATE.start_cmemchr_#t~post3#1.base| |ULTIMATE.start_cmemchr_~p~0#1.base|) (= |ULTIMATE.start_cmemchr_#t~post3#1.offset| |ULTIMATE.start_cmemchr_~s#1.offset|) (<= 0 |ULTIMATE.start_main_~nondetArea~0#1.base|) (= |ULTIMATE.start_cmemchr_#in~n#1| |ULTIMATE.start_cmemchr_~n#1|) (= |ULTIMATE.start_cmemchr_#in~s#1.offset| |ULTIMATE.start_cmemchr_~s#1.offset|) (= (+ |ULTIMATE.start_cmemchr_#t~post3#1.offset| 1) |ULTIMATE.start_cmemchr_~p~0#1.offset|) (<= |ULTIMATE.start_main_~c~0#1| 2147483647) (<= 0 |ULTIMATE.start_main_#t~malloc8#1.base|) (not (<= (+ |ULTIMATE.start_cmemchr_#t~post3#1.offset| 1) (select |#length| |ULTIMATE.start_cmemchr_#t~post3#1.base|))) (<= 1 |ULTIMATE.start_main_~n~0#1|) (<= 1 |ULTIMATE.start_main_~length~0#1|) (= |#NULL.offset| 0) (= |ULTIMATE.start_cmemchr_#in~c#1| |ULTIMATE.start_cmemchr_~c#1|) (<= 0 (+ |ULTIMATE.start_main_~c~0#1| 2147483648)) (not (< |ULTIMATE.start_main_~i~0#1| |ULTIMATE.start_main_~n~0#1|)) (<= |ULTIMATE.start_main_~nondetArea~0#1.offset| 0) (= |ULTIMATE.start_cmemchr_#in~c#1| |ULTIMATE.start_main_~c~0#1|) (= |ULTIMATE.start_cmemchr_~s#1.base| |ULTIMATE.start_cmemchr_#in~s#1.base|) (<= 0 |#StackHeapBarrier|) (= |ULTIMATE.start_cmemchr_#in~s#1.offset| |ULTIMATE.start_main_~nondetArea~0#1.offset|) (= |#NULL.base| 0) (= |ULTIMATE.start_cmemchr_~s#1.base| |ULTIMATE.start_cmemchr_#t~post3#1.base|))' at error location [2022-11-03 02:06:38,041 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-03 02:06:38,042 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-03 02:06:38,042 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 5, 5] total 6 [2022-11-03 02:06:38,042 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1408921953] [2022-11-03 02:06:38,042 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-03 02:06:38,042 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2022-11-03 02:06:38,043 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-03 02:06:38,043 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2022-11-03 02:06:38,043 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=41, Invalid=141, Unknown=0, NotChecked=0, Total=182 [2022-11-03 02:06:38,043 INFO L87 Difference]: Start difference. First operand 14 states and 17 transitions. Second operand has 8 states, 7 states have (on average 1.4285714285714286) internal successors, (10), 7 states have internal predecessors, (10), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 02:06:38,193 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-03 02:06:38,194 INFO L93 Difference]: Finished difference Result 17 states and 20 transitions. [2022-11-03 02:06:38,195 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2022-11-03 02:06:38,195 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 7 states have (on average 1.4285714285714286) internal successors, (10), 7 states have internal predecessors, (10), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 7 [2022-11-03 02:06:38,195 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-03 02:06:38,196 INFO L225 Difference]: With dead ends: 17 [2022-11-03 02:06:38,196 INFO L226 Difference]: Without dead ends: 17 [2022-11-03 02:06:38,196 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 29 GetRequests, 11 SyntacticMatches, 1 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 34 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=73, Invalid=269, Unknown=0, NotChecked=0, Total=342 [2022-11-03 02:06:38,197 INFO L413 NwaCegarLoop]: 7 mSDtfsCounter, 44 mSDsluCounter, 21 mSDsCounter, 0 mSdLazyCounter, 38 mSolverCounterSat, 7 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 44 SdHoareTripleChecker+Valid, 26 SdHoareTripleChecker+Invalid, 45 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 7 IncrementalHoareTripleChecker+Valid, 38 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-11-03 02:06:38,197 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [44 Valid, 26 Invalid, 45 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [7 Valid, 38 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-11-03 02:06:38,198 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 17 states. [2022-11-03 02:06:38,199 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 17 to 16. [2022-11-03 02:06:38,199 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 16 states, 14 states have (on average 1.3571428571428572) internal successors, (19), 15 states have internal predecessors, (19), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 02:06:38,200 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 16 states to 16 states and 19 transitions. [2022-11-03 02:06:38,200 INFO L78 Accepts]: Start accepts. Automaton has 16 states and 19 transitions. Word has length 7 [2022-11-03 02:06:38,200 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-03 02:06:38,200 INFO L495 AbstractCegarLoop]: Abstraction has 16 states and 19 transitions. [2022-11-03 02:06:38,200 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 8 states, 7 states have (on average 1.4285714285714286) internal successors, (10), 7 states have internal predecessors, (10), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 02:06:38,201 INFO L276 IsEmpty]: Start isEmpty. Operand 16 states and 19 transitions. [2022-11-03 02:06:38,201 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 9 [2022-11-03 02:06:38,201 INFO L187 NwaCegarLoop]: Found error trace [2022-11-03 02:06:38,201 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1] [2022-11-03 02:06:38,245 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_81634ae4-27af-40ae-86b0-f7d8326dcf83/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Forceful destruction successful, exit code 0 [2022-11-03 02:06:38,413 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_81634ae4-27af-40ae-86b0-f7d8326dcf83/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-03 02:06:38,413 INFO L420 AbstractCegarLoop]: === Iteration 6 === Targeting ULTIMATE.startErr4ASSERT_VIOLATIONMEMORY_LEAK === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 2 more)] === [2022-11-03 02:06:38,413 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-03 02:06:38,414 INFO L85 PathProgramCache]: Analyzing trace with hash 1191320785, now seen corresponding path program 1 times [2022-11-03 02:06:38,414 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-03 02:06:38,414 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1006221676] [2022-11-03 02:06:38,414 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-03 02:06:38,414 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-03 02:06:38,430 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-03 02:06:38,574 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-11-03 02:06:38,574 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-03 02:06:38,575 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1006221676] [2022-11-03 02:06:38,575 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1006221676] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-03 02:06:38,575 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-11-03 02:06:38,575 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2022-11-03 02:06:38,575 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2064653087] [2022-11-03 02:06:38,576 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-03 02:06:38,576 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2022-11-03 02:06:38,576 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-03 02:06:38,577 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2022-11-03 02:06:38,577 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2022-11-03 02:06:38,577 INFO L87 Difference]: Start difference. First operand 16 states and 19 transitions. Second operand has 4 states, 3 states have (on average 2.6666666666666665) internal successors, (8), 3 states have internal predecessors, (8), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 02:06:38,597 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-03 02:06:38,597 INFO L93 Difference]: Finished difference Result 15 states and 18 transitions. [2022-11-03 02:06:38,598 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2022-11-03 02:06:38,598 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 3 states have (on average 2.6666666666666665) internal successors, (8), 3 states have internal predecessors, (8), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 8 [2022-11-03 02:06:38,598 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-03 02:06:38,599 INFO L225 Difference]: With dead ends: 15 [2022-11-03 02:06:38,599 INFO L226 Difference]: Without dead ends: 12 [2022-11-03 02:06:38,600 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 2 GetRequests, 0 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2022-11-03 02:06:38,601 INFO L413 NwaCegarLoop]: 9 mSDtfsCounter, 8 mSDsluCounter, 11 mSDsCounter, 0 mSdLazyCounter, 12 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 8 SdHoareTripleChecker+Valid, 18 SdHoareTripleChecker+Invalid, 12 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 12 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-11-03 02:06:38,602 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [8 Valid, 18 Invalid, 12 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 12 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-11-03 02:06:38,604 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 12 states. [2022-11-03 02:06:38,606 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 12 to 12. [2022-11-03 02:06:38,606 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 12 states, 11 states have (on average 1.1818181818181819) internal successors, (13), 11 states have internal predecessors, (13), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 02:06:38,607 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 12 states to 12 states and 13 transitions. [2022-11-03 02:06:38,607 INFO L78 Accepts]: Start accepts. Automaton has 12 states and 13 transitions. Word has length 8 [2022-11-03 02:06:38,607 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-03 02:06:38,608 INFO L495 AbstractCegarLoop]: Abstraction has 12 states and 13 transitions. [2022-11-03 02:06:38,608 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 3 states have (on average 2.6666666666666665) internal successors, (8), 3 states have internal predecessors, (8), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 02:06:38,608 INFO L276 IsEmpty]: Start isEmpty. Operand 12 states and 13 transitions. [2022-11-03 02:06:38,608 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2022-11-03 02:06:38,609 INFO L187 NwaCegarLoop]: Found error trace [2022-11-03 02:06:38,609 INFO L195 NwaCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-03 02:06:38,609 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5 [2022-11-03 02:06:38,610 INFO L420 AbstractCegarLoop]: === Iteration 7 === Targeting ULTIMATE.startErr3REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 2 more)] === [2022-11-03 02:06:38,610 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-03 02:06:38,611 INFO L85 PathProgramCache]: Analyzing trace with hash 846637802, now seen corresponding path program 1 times [2022-11-03 02:06:38,611 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-03 02:06:38,611 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [996955176] [2022-11-03 02:06:38,611 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-03 02:06:38,611 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-03 02:06:38,650 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-03 02:06:38,872 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 2 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-03 02:06:38,872 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-03 02:06:38,873 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [996955176] [2022-11-03 02:06:38,873 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [996955176] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-03 02:06:38,873 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1709742825] [2022-11-03 02:06:38,873 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-03 02:06:38,874 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-03 02:06:38,874 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_81634ae4-27af-40ae-86b0-f7d8326dcf83/bin/utaipan-7li7fVZpFI/z3 [2022-11-03 02:06:38,875 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_81634ae4-27af-40ae-86b0-f7d8326dcf83/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-03 02:06:38,896 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_81634ae4-27af-40ae-86b0-f7d8326dcf83/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2022-11-03 02:06:38,961 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-03 02:06:38,963 INFO L263 TraceCheckSpWp]: Trace formula consists of 100 conjuncts, 12 conjunts are in the unsatisfiable core [2022-11-03 02:06:38,965 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-03 02:06:39,055 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 2 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-03 02:06:39,056 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-03 02:06:39,189 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 2 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-03 02:06:39,191 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1709742825] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-03 02:06:39,191 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1361019396] [2022-11-03 02:06:39,208 INFO L159 IcfgInterpreter]: Started Sifa with 9 locations of interest [2022-11-03 02:06:39,208 INFO L166 IcfgInterpreter]: Building call graph [2022-11-03 02:06:39,208 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-03 02:06:39,209 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-03 02:06:39,209 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-03 02:06:39,254 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 8 treesize of output 7 [2022-11-03 02:06:39,293 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2022-11-03 02:06:39,350 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-11-03 02:06:40,033 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-03 02:06:41,828 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '430#(and (<= |ULTIMATE.start_main_~length~0#1| 2147483647) (<= |ULTIMATE.start_main_~n~0#1| 2147483647) (<= |ULTIMATE.start_cmemchr_#in~s#1.offset| 0) (= |ULTIMATE.start_main_#t~malloc8#1.offset| 0) (<= |ULTIMATE.start_cmemchr_~s#1.offset| 0) (<= 0 |ULTIMATE.start_main_~nondetArea~0#1.offset|) (<= 1 |ULTIMATE.start_main_~i~0#1|) (<= 0 |ULTIMATE.start_cmemchr_#t~post3#1.offset|) (<= 0 |ULTIMATE.start_main_~nondetArea~0#1.base|) (< (select |#length| |ULTIMATE.start_cmemchr_#t~post3#1.base|) (+ |ULTIMATE.start_cmemchr_#t~post3#1.offset| 1)) (<= 0 |ULTIMATE.start_cmemchr_#t~post3#1.base|) (<= 1 |ULTIMATE.start_cmemchr_~p~0#1.offset|) (<= |ULTIMATE.start_cmemchr_~n#1| 2147483647) (<= 0 |ULTIMATE.start_cmemchr_~s#1.base|) (<= |ULTIMATE.start_main_~c~0#1| 2147483647) (<= 0 |ULTIMATE.start_main_#t~malloc8#1.base|) (<= 0 (+ |ULTIMATE.start_cmemchr_#in~c#1| 2147483648)) (<= 0 |ULTIMATE.start_cmemchr_~s#1.offset|) (<= 1 |ULTIMATE.start_main_~n~0#1|) (<= 1 |ULTIMATE.start_main_~length~0#1|) (<= |ULTIMATE.start_cmemchr_#in~c#1| 2147483647) (= |#NULL.offset| 0) (<= 0 |ULTIMATE.start_cmemchr_~p~0#1.base|) (<= |ULTIMATE.start_cmemchr_#in~n#1| 2147483647) (<= 0 (+ |ULTIMATE.start_main_~c~0#1| 2147483648)) (<= 0 (+ |ULTIMATE.start_cmemchr_~c#1| 2147483648)) (<= 0 |ULTIMATE.start_cmemchr_#in~s#1.base|) (<= |ULTIMATE.start_main_~nondetArea~0#1.offset| 0) (<= 0 |#StackHeapBarrier|) (<= 0 |ULTIMATE.start_cmemchr_#in~s#1.offset|) (<= 1 |ULTIMATE.start_cmemchr_#in~n#1|) (<= |ULTIMATE.start_cmemchr_~c#1| 2147483647) (= |#NULL.base| 0))' at error location [2022-11-03 02:06:41,829 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-03 02:06:41,829 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-03 02:06:41,829 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 6, 6] total 12 [2022-11-03 02:06:41,829 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1897590715] [2022-11-03 02:06:41,829 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-03 02:06:41,830 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 13 states [2022-11-03 02:06:41,830 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-03 02:06:41,830 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2022-11-03 02:06:41,831 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=61, Invalid=359, Unknown=0, NotChecked=0, Total=420 [2022-11-03 02:06:41,831 INFO L87 Difference]: Start difference. First operand 12 states and 13 transitions. Second operand has 13 states, 13 states have (on average 1.6923076923076923) internal successors, (22), 12 states have internal predecessors, (22), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 02:06:41,945 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-03 02:06:41,945 INFO L93 Difference]: Finished difference Result 20 states and 21 transitions. [2022-11-03 02:06:41,946 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2022-11-03 02:06:41,946 INFO L78 Accepts]: Start accepts. Automaton has has 13 states, 13 states have (on average 1.6923076923076923) internal successors, (22), 12 states have internal predecessors, (22), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 11 [2022-11-03 02:06:41,946 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-03 02:06:41,946 INFO L225 Difference]: With dead ends: 20 [2022-11-03 02:06:41,947 INFO L226 Difference]: Without dead ends: 15 [2022-11-03 02:06:41,947 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 39 GetRequests, 17 SyntacticMatches, 1 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 132 ImplicationChecksByTransitivity, 2.0s TimeCoverageRelationStatistics Valid=76, Invalid=430, Unknown=0, NotChecked=0, Total=506 [2022-11-03 02:06:41,948 INFO L413 NwaCegarLoop]: 4 mSDtfsCounter, 10 mSDsluCounter, 35 mSDsCounter, 0 mSdLazyCounter, 40 mSolverCounterSat, 7 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 10 SdHoareTripleChecker+Valid, 34 SdHoareTripleChecker+Invalid, 47 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 7 IncrementalHoareTripleChecker+Valid, 40 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-11-03 02:06:41,949 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [10 Valid, 34 Invalid, 47 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [7 Valid, 40 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-11-03 02:06:41,949 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 15 states. [2022-11-03 02:06:41,951 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 15 to 14. [2022-11-03 02:06:41,951 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 14 states, 13 states have (on average 1.1538461538461537) internal successors, (15), 13 states have internal predecessors, (15), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 02:06:41,952 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 14 states to 14 states and 15 transitions. [2022-11-03 02:06:41,952 INFO L78 Accepts]: Start accepts. Automaton has 14 states and 15 transitions. Word has length 11 [2022-11-03 02:06:41,952 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-03 02:06:41,952 INFO L495 AbstractCegarLoop]: Abstraction has 14 states and 15 transitions. [2022-11-03 02:06:41,953 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 13 states, 13 states have (on average 1.6923076923076923) internal successors, (22), 12 states have internal predecessors, (22), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 02:06:41,953 INFO L276 IsEmpty]: Start isEmpty. Operand 14 states and 15 transitions. [2022-11-03 02:06:41,953 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2022-11-03 02:06:41,953 INFO L187 NwaCegarLoop]: Found error trace [2022-11-03 02:06:41,954 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 2, 1, 1, 1, 1, 1, 1, 1] [2022-11-03 02:06:41,984 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_81634ae4-27af-40ae-86b0-f7d8326dcf83/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Forceful destruction successful, exit code 0 [2022-11-03 02:06:42,154 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_81634ae4-27af-40ae-86b0-f7d8326dcf83/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable6 [2022-11-03 02:06:42,155 INFO L420 AbstractCegarLoop]: === Iteration 8 === Targeting ULTIMATE.startErr3REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 2 more)] === [2022-11-03 02:06:42,155 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-03 02:06:42,155 INFO L85 PathProgramCache]: Analyzing trace with hash 1973139321, now seen corresponding path program 2 times [2022-11-03 02:06:42,155 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-03 02:06:42,155 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1262310932] [2022-11-03 02:06:42,155 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-03 02:06:42,156 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-03 02:06:42,177 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-03 02:06:42,428 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-03 02:06:42,429 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-03 02:06:42,429 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1262310932] [2022-11-03 02:06:42,429 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1262310932] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-03 02:06:42,429 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [337138222] [2022-11-03 02:06:42,429 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-11-03 02:06:42,430 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-03 02:06:42,430 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_81634ae4-27af-40ae-86b0-f7d8326dcf83/bin/utaipan-7li7fVZpFI/z3 [2022-11-03 02:06:42,431 INFO L229 MonitoredProcess]: Starting monitored process 5 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_81634ae4-27af-40ae-86b0-f7d8326dcf83/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-03 02:06:42,448 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_81634ae4-27af-40ae-86b0-f7d8326dcf83/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2022-11-03 02:06:42,513 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 2 check-sat command(s) [2022-11-03 02:06:42,514 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-03 02:06:42,515 INFO L263 TraceCheckSpWp]: Trace formula consists of 100 conjuncts, 36 conjunts are in the unsatisfiable core [2022-11-03 02:06:42,517 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-03 02:06:42,816 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-11-03 02:06:42,817 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-03 02:06:43,266 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 5 treesize of output 3 [2022-11-03 02:06:43,354 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-11-03 02:06:43,354 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [337138222] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-03 02:06:43,354 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [786910947] [2022-11-03 02:06:43,357 INFO L159 IcfgInterpreter]: Started Sifa with 9 locations of interest [2022-11-03 02:06:43,357 INFO L166 IcfgInterpreter]: Building call graph [2022-11-03 02:06:43,358 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-03 02:06:43,358 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-03 02:06:43,358 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-03 02:06:43,392 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 8 treesize of output 7 [2022-11-03 02:06:43,440 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-11-03 02:06:43,491 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-11-03 02:06:44,007 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-03 02:06:45,953 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '575#(and (<= |ULTIMATE.start_main_~length~0#1| 2147483647) (<= |ULTIMATE.start_main_~n~0#1| 2147483647) (<= |ULTIMATE.start_cmemchr_#in~s#1.offset| 0) (= |ULTIMATE.start_main_#t~malloc8#1.offset| 0) (<= |ULTIMATE.start_cmemchr_~s#1.offset| 0) (<= 0 |ULTIMATE.start_main_~nondetArea~0#1.offset|) (<= 1 |ULTIMATE.start_main_~i~0#1|) (<= 0 |ULTIMATE.start_cmemchr_#t~post3#1.offset|) (<= 0 |ULTIMATE.start_main_~nondetArea~0#1.base|) (< (select |#length| |ULTIMATE.start_cmemchr_#t~post3#1.base|) (+ |ULTIMATE.start_cmemchr_#t~post3#1.offset| 1)) (<= 0 |ULTIMATE.start_cmemchr_#t~post3#1.base|) (<= 1 |ULTIMATE.start_cmemchr_~p~0#1.offset|) (<= |ULTIMATE.start_cmemchr_~n#1| 2147483647) (<= 0 |ULTIMATE.start_cmemchr_~s#1.base|) (<= |ULTIMATE.start_main_~c~0#1| 2147483647) (<= 0 |ULTIMATE.start_main_#t~malloc8#1.base|) (<= 0 (+ |ULTIMATE.start_cmemchr_#in~c#1| 2147483648)) (<= 0 |ULTIMATE.start_cmemchr_~s#1.offset|) (<= 1 |ULTIMATE.start_main_~n~0#1|) (<= 1 |ULTIMATE.start_main_~length~0#1|) (<= |ULTIMATE.start_cmemchr_#in~c#1| 2147483647) (= |#NULL.offset| 0) (<= 0 |ULTIMATE.start_cmemchr_~p~0#1.base|) (<= |ULTIMATE.start_cmemchr_#in~n#1| 2147483647) (<= 0 (+ |ULTIMATE.start_main_~c~0#1| 2147483648)) (<= 0 (+ |ULTIMATE.start_cmemchr_~c#1| 2147483648)) (<= 0 |ULTIMATE.start_cmemchr_#in~s#1.base|) (<= |ULTIMATE.start_main_~nondetArea~0#1.offset| 0) (<= 0 |#StackHeapBarrier|) (<= 0 |ULTIMATE.start_cmemchr_#in~s#1.offset|) (<= 1 |ULTIMATE.start_cmemchr_#in~n#1|) (<= |ULTIMATE.start_cmemchr_~c#1| 2147483647) (= |#NULL.base| 0))' at error location [2022-11-03 02:06:45,954 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-03 02:06:45,954 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-03 02:06:45,954 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 10, 10] total 25 [2022-11-03 02:06:45,955 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1714737622] [2022-11-03 02:06:45,955 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-03 02:06:45,956 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 27 states [2022-11-03 02:06:45,956 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-03 02:06:45,956 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 27 interpolants. [2022-11-03 02:06:45,958 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=133, Invalid=1057, Unknown=0, NotChecked=0, Total=1190 [2022-11-03 02:06:45,960 INFO L87 Difference]: Start difference. First operand 14 states and 15 transitions. Second operand has 27 states, 26 states have (on average 1.3846153846153846) internal successors, (36), 26 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 02:06:46,644 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-03 02:06:46,644 INFO L93 Difference]: Finished difference Result 20 states and 21 transitions. [2022-11-03 02:06:46,645 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2022-11-03 02:06:46,645 INFO L78 Accepts]: Start accepts. Automaton has has 27 states, 26 states have (on average 1.3846153846153846) internal successors, (36), 26 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 13 [2022-11-03 02:06:46,645 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-03 02:06:46,646 INFO L225 Difference]: With dead ends: 20 [2022-11-03 02:06:46,646 INFO L226 Difference]: Without dead ends: 20 [2022-11-03 02:06:46,647 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 57 GetRequests, 11 SyntacticMatches, 1 SemanticMatches, 45 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 298 ImplicationChecksByTransitivity, 3.1s TimeCoverageRelationStatistics Valid=325, Invalid=1837, Unknown=0, NotChecked=0, Total=2162 [2022-11-03 02:06:46,648 INFO L413 NwaCegarLoop]: 0 mSDtfsCounter, 79 mSDsluCounter, 3 mSDsCounter, 0 mSdLazyCounter, 186 mSolverCounterSat, 43 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 79 SdHoareTripleChecker+Valid, 2 SdHoareTripleChecker+Invalid, 229 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 43 IncrementalHoareTripleChecker+Valid, 186 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-11-03 02:06:46,648 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [79 Valid, 2 Invalid, 229 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [43 Valid, 186 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-11-03 02:06:46,649 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 20 states. [2022-11-03 02:06:46,650 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 20 to 18. [2022-11-03 02:06:46,651 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 18 states, 17 states have (on average 1.1176470588235294) internal successors, (19), 17 states have internal predecessors, (19), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 02:06:46,651 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 18 states to 18 states and 19 transitions. [2022-11-03 02:06:46,651 INFO L78 Accepts]: Start accepts. Automaton has 18 states and 19 transitions. Word has length 13 [2022-11-03 02:06:46,652 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-03 02:06:46,652 INFO L495 AbstractCegarLoop]: Abstraction has 18 states and 19 transitions. [2022-11-03 02:06:46,652 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 27 states, 26 states have (on average 1.3846153846153846) internal successors, (36), 26 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 02:06:46,652 INFO L276 IsEmpty]: Start isEmpty. Operand 18 states and 19 transitions. [2022-11-03 02:06:46,653 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2022-11-03 02:06:46,653 INFO L187 NwaCegarLoop]: Found error trace [2022-11-03 02:06:46,653 INFO L195 NwaCegarLoop]: trace histogram [3, 2, 2, 2, 2, 2, 1, 1, 1, 1] [2022-11-03 02:06:46,680 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_81634ae4-27af-40ae-86b0-f7d8326dcf83/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Forceful destruction successful, exit code 0 [2022-11-03 02:06:46,854 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7,5 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_81634ae4-27af-40ae-86b0-f7d8326dcf83/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-03 02:06:46,854 INFO L420 AbstractCegarLoop]: === Iteration 9 === Targeting ULTIMATE.startErr3REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 2 more)] === [2022-11-03 02:06:46,854 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-03 02:06:46,854 INFO L85 PathProgramCache]: Analyzing trace with hash 1234612777, now seen corresponding path program 3 times [2022-11-03 02:06:46,855 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-03 02:06:46,855 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2108152625] [2022-11-03 02:06:46,855 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-03 02:06:46,855 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-03 02:06:46,881 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-03 02:06:47,039 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 4 proven. 8 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-03 02:06:47,039 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-03 02:06:47,039 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2108152625] [2022-11-03 02:06:47,040 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2108152625] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-03 02:06:47,040 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [758415495] [2022-11-03 02:06:47,040 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-11-03 02:06:47,040 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-03 02:06:47,040 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_81634ae4-27af-40ae-86b0-f7d8326dcf83/bin/utaipan-7li7fVZpFI/z3 [2022-11-03 02:06:47,041 INFO L229 MonitoredProcess]: Starting monitored process 6 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_81634ae4-27af-40ae-86b0-f7d8326dcf83/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-03 02:06:47,064 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_81634ae4-27af-40ae-86b0-f7d8326dcf83/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2022-11-03 02:06:47,116 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-11-03 02:06:47,116 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-03 02:06:47,117 INFO L263 TraceCheckSpWp]: Trace formula consists of 133 conjuncts, 16 conjunts are in the unsatisfiable core [2022-11-03 02:06:47,118 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-03 02:06:47,202 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 4 proven. 8 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-03 02:06:47,203 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-03 02:06:47,377 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 4 proven. 8 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-03 02:06:47,377 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [758415495] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-03 02:06:47,377 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [2143914921] [2022-11-03 02:06:47,380 INFO L159 IcfgInterpreter]: Started Sifa with 9 locations of interest [2022-11-03 02:06:47,380 INFO L166 IcfgInterpreter]: Building call graph [2022-11-03 02:06:47,381 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-03 02:06:47,381 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-03 02:06:47,381 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-03 02:06:47,405 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 8 treesize of output 7 [2022-11-03 02:06:47,443 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2022-11-03 02:06:47,477 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-11-03 02:06:47,951 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-03 02:06:49,526 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '759#(and (<= |ULTIMATE.start_main_~length~0#1| 2147483647) (<= |ULTIMATE.start_main_~n~0#1| 2147483647) (<= |ULTIMATE.start_cmemchr_#in~s#1.offset| 0) (= |ULTIMATE.start_main_#t~malloc8#1.offset| 0) (<= |ULTIMATE.start_cmemchr_~s#1.offset| 0) (<= 0 |ULTIMATE.start_main_~nondetArea~0#1.offset|) (<= 1 |ULTIMATE.start_main_~i~0#1|) (<= 0 |ULTIMATE.start_cmemchr_#t~post3#1.offset|) (<= 0 |ULTIMATE.start_main_~nondetArea~0#1.base|) (< (select |#length| |ULTIMATE.start_cmemchr_#t~post3#1.base|) (+ |ULTIMATE.start_cmemchr_#t~post3#1.offset| 1)) (<= 0 |ULTIMATE.start_cmemchr_#t~post3#1.base|) (<= 1 |ULTIMATE.start_cmemchr_~p~0#1.offset|) (<= |ULTIMATE.start_cmemchr_~n#1| 2147483647) (<= 0 |ULTIMATE.start_cmemchr_~s#1.base|) (<= |ULTIMATE.start_main_~c~0#1| 2147483647) (<= 0 |ULTIMATE.start_main_#t~malloc8#1.base|) (<= 0 (+ |ULTIMATE.start_cmemchr_#in~c#1| 2147483648)) (<= 0 |ULTIMATE.start_cmemchr_~s#1.offset|) (<= 1 |ULTIMATE.start_main_~n~0#1|) (<= 1 |ULTIMATE.start_main_~length~0#1|) (<= |ULTIMATE.start_cmemchr_#in~c#1| 2147483647) (= |#NULL.offset| 0) (<= 0 |ULTIMATE.start_cmemchr_~p~0#1.base|) (<= |ULTIMATE.start_cmemchr_#in~n#1| 2147483647) (<= 0 (+ |ULTIMATE.start_main_~c~0#1| 2147483648)) (<= 0 (+ |ULTIMATE.start_cmemchr_~c#1| 2147483648)) (<= 0 |ULTIMATE.start_cmemchr_#in~s#1.base|) (<= |ULTIMATE.start_main_~nondetArea~0#1.offset| 0) (<= 0 |#StackHeapBarrier|) (<= 0 |ULTIMATE.start_cmemchr_#in~s#1.offset|) (<= 1 |ULTIMATE.start_cmemchr_#in~n#1|) (<= |ULTIMATE.start_cmemchr_~c#1| 2147483647) (= |#NULL.base| 0))' at error location [2022-11-03 02:06:49,526 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-03 02:06:49,526 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-03 02:06:49,526 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8, 8] total 17 [2022-11-03 02:06:49,526 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [148917669] [2022-11-03 02:06:49,527 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-03 02:06:49,527 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 18 states [2022-11-03 02:06:49,527 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-03 02:06:49,528 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2022-11-03 02:06:49,528 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=77, Invalid=573, Unknown=0, NotChecked=0, Total=650 [2022-11-03 02:06:49,528 INFO L87 Difference]: Start difference. First operand 18 states and 19 transitions. Second operand has 18 states, 18 states have (on average 2.0) internal successors, (36), 17 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 02:06:49,735 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-03 02:06:49,735 INFO L93 Difference]: Finished difference Result 30 states and 31 transitions. [2022-11-03 02:06:49,735 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2022-11-03 02:06:49,735 INFO L78 Accepts]: Start accepts. Automaton has has 18 states, 18 states have (on average 2.0) internal successors, (36), 17 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 17 [2022-11-03 02:06:49,736 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-03 02:06:49,736 INFO L225 Difference]: With dead ends: 30 [2022-11-03 02:06:49,736 INFO L226 Difference]: Without dead ends: 21 [2022-11-03 02:06:49,737 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 61 GetRequests, 32 SyntacticMatches, 1 SemanticMatches, 28 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 190 ImplicationChecksByTransitivity, 1.8s TimeCoverageRelationStatistics Valid=104, Invalid=766, Unknown=0, NotChecked=0, Total=870 [2022-11-03 02:06:49,738 INFO L413 NwaCegarLoop]: 6 mSDtfsCounter, 16 mSDsluCounter, 84 mSDsCounter, 0 mSdLazyCounter, 130 mSolverCounterSat, 8 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 16 SdHoareTripleChecker+Valid, 80 SdHoareTripleChecker+Invalid, 138 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 8 IncrementalHoareTripleChecker+Valid, 130 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-11-03 02:06:49,738 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [16 Valid, 80 Invalid, 138 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [8 Valid, 130 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-11-03 02:06:49,739 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 21 states. [2022-11-03 02:06:49,740 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 21 to 20. [2022-11-03 02:06:49,741 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 20 states, 19 states have (on average 1.105263157894737) internal successors, (21), 19 states have internal predecessors, (21), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 02:06:49,741 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 20 states to 20 states and 21 transitions. [2022-11-03 02:06:49,741 INFO L78 Accepts]: Start accepts. Automaton has 20 states and 21 transitions. Word has length 17 [2022-11-03 02:06:49,742 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-03 02:06:49,742 INFO L495 AbstractCegarLoop]: Abstraction has 20 states and 21 transitions. [2022-11-03 02:06:49,742 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 18 states, 18 states have (on average 2.0) internal successors, (36), 17 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 02:06:49,742 INFO L276 IsEmpty]: Start isEmpty. Operand 20 states and 21 transitions. [2022-11-03 02:06:49,743 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2022-11-03 02:06:49,743 INFO L187 NwaCegarLoop]: Found error trace [2022-11-03 02:06:49,743 INFO L195 NwaCegarLoop]: trace histogram [3, 3, 3, 2, 2, 2, 1, 1, 1, 1] [2022-11-03 02:06:49,773 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_81634ae4-27af-40ae-86b0-f7d8326dcf83/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Forceful destruction successful, exit code 0 [2022-11-03 02:06:49,957 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8,6 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_81634ae4-27af-40ae-86b0-f7d8326dcf83/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-03 02:06:49,957 INFO L420 AbstractCegarLoop]: === Iteration 10 === Targeting ULTIMATE.startErr3REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 2 more)] === [2022-11-03 02:06:49,957 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-03 02:06:49,958 INFO L85 PathProgramCache]: Analyzing trace with hash 878565240, now seen corresponding path program 4 times [2022-11-03 02:06:49,958 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-03 02:06:49,958 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1943552596] [2022-11-03 02:06:49,958 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-03 02:06:49,958 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-03 02:06:49,975 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-03 02:06:50,348 INFO L134 CoverageAnalysis]: Checked inductivity of 17 backedges. 2 proven. 15 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-03 02:06:50,348 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-03 02:06:50,349 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1943552596] [2022-11-03 02:06:50,349 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1943552596] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-03 02:06:50,349 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1016087307] [2022-11-03 02:06:50,349 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-11-03 02:06:50,349 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-03 02:06:50,349 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_81634ae4-27af-40ae-86b0-f7d8326dcf83/bin/utaipan-7li7fVZpFI/z3 [2022-11-03 02:06:50,350 INFO L229 MonitoredProcess]: Starting monitored process 7 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_81634ae4-27af-40ae-86b0-f7d8326dcf83/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-03 02:06:50,351 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_81634ae4-27af-40ae-86b0-f7d8326dcf83/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Waiting until timeout for monitored process [2022-11-03 02:06:50,428 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-03 02:06:50,429 INFO L263 TraceCheckSpWp]: Trace formula consists of 146 conjuncts, 36 conjunts are in the unsatisfiable core [2022-11-03 02:06:50,431 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-03 02:06:50,643 INFO L134 CoverageAnalysis]: Checked inductivity of 17 backedges. 6 proven. 11 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-03 02:06:50,643 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-03 02:06:50,928 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 7 treesize of output 5 [2022-11-03 02:06:50,975 INFO L134 CoverageAnalysis]: Checked inductivity of 17 backedges. 6 proven. 11 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-03 02:06:50,975 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1016087307] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-03 02:06:50,975 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1901688431] [2022-11-03 02:06:50,977 INFO L159 IcfgInterpreter]: Started Sifa with 9 locations of interest [2022-11-03 02:06:50,978 INFO L166 IcfgInterpreter]: Building call graph [2022-11-03 02:06:50,978 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-03 02:06:50,978 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-03 02:06:50,979 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-03 02:06:51,004 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 8 treesize of output 7 [2022-11-03 02:06:51,046 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-11-03 02:06:51,085 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-11-03 02:06:51,597 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-03 02:06:53,639 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '959#(and (<= |ULTIMATE.start_main_~length~0#1| 2147483647) (<= |ULTIMATE.start_main_~n~0#1| 2147483647) (<= |ULTIMATE.start_cmemchr_#in~s#1.offset| 0) (= |ULTIMATE.start_main_#t~malloc8#1.offset| 0) (<= |ULTIMATE.start_cmemchr_~s#1.offset| 0) (<= 0 |ULTIMATE.start_main_~nondetArea~0#1.offset|) (<= 1 |ULTIMATE.start_main_~i~0#1|) (<= 0 |ULTIMATE.start_cmemchr_#t~post3#1.offset|) (<= 0 |ULTIMATE.start_main_~nondetArea~0#1.base|) (< (select |#length| |ULTIMATE.start_cmemchr_#t~post3#1.base|) (+ |ULTIMATE.start_cmemchr_#t~post3#1.offset| 1)) (<= 0 |ULTIMATE.start_cmemchr_#t~post3#1.base|) (<= 1 |ULTIMATE.start_cmemchr_~p~0#1.offset|) (<= |ULTIMATE.start_cmemchr_~n#1| 2147483647) (<= 0 |ULTIMATE.start_cmemchr_~s#1.base|) (<= |ULTIMATE.start_main_~c~0#1| 2147483647) (<= 0 |ULTIMATE.start_main_#t~malloc8#1.base|) (<= 0 (+ |ULTIMATE.start_cmemchr_#in~c#1| 2147483648)) (<= 0 |ULTIMATE.start_cmemchr_~s#1.offset|) (<= 1 |ULTIMATE.start_main_~n~0#1|) (<= 1 |ULTIMATE.start_main_~length~0#1|) (<= |ULTIMATE.start_cmemchr_#in~c#1| 2147483647) (= |#NULL.offset| 0) (<= 0 |ULTIMATE.start_cmemchr_~p~0#1.base|) (<= |ULTIMATE.start_cmemchr_#in~n#1| 2147483647) (<= 0 (+ |ULTIMATE.start_main_~c~0#1| 2147483648)) (<= 0 (+ |ULTIMATE.start_cmemchr_~c#1| 2147483648)) (<= 0 |ULTIMATE.start_cmemchr_#in~s#1.base|) (<= |ULTIMATE.start_main_~nondetArea~0#1.offset| 0) (<= 0 |#StackHeapBarrier|) (<= 0 |ULTIMATE.start_cmemchr_#in~s#1.offset|) (<= 1 |ULTIMATE.start_cmemchr_#in~n#1|) (<= |ULTIMATE.start_cmemchr_~c#1| 2147483647) (= |#NULL.base| 0))' at error location [2022-11-03 02:06:53,639 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-03 02:06:53,640 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-03 02:06:53,640 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 10, 10] total 24 [2022-11-03 02:06:53,640 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [877234088] [2022-11-03 02:06:53,640 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-03 02:06:53,641 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 26 states [2022-11-03 02:06:53,641 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-03 02:06:53,642 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2022-11-03 02:06:53,642 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=128, Invalid=994, Unknown=0, NotChecked=0, Total=1122 [2022-11-03 02:06:53,643 INFO L87 Difference]: Start difference. First operand 20 states and 21 transitions. Second operand has 26 states, 25 states have (on average 1.72) internal successors, (43), 25 states have internal predecessors, (43), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 02:06:54,151 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-03 02:06:54,152 INFO L93 Difference]: Finished difference Result 26 states and 27 transitions. [2022-11-03 02:06:54,152 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2022-11-03 02:06:54,152 INFO L78 Accepts]: Start accepts. Automaton has has 26 states, 25 states have (on average 1.72) internal successors, (43), 25 states have internal predecessors, (43), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 19 [2022-11-03 02:06:54,153 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-03 02:06:54,153 INFO L225 Difference]: With dead ends: 26 [2022-11-03 02:06:54,153 INFO L226 Difference]: Without dead ends: 26 [2022-11-03 02:06:54,154 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 74 GetRequests, 30 SyntacticMatches, 3 SemanticMatches, 41 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 392 ImplicationChecksByTransitivity, 2.8s TimeCoverageRelationStatistics Valid=287, Invalid=1519, Unknown=0, NotChecked=0, Total=1806 [2022-11-03 02:06:54,155 INFO L413 NwaCegarLoop]: 2 mSDtfsCounter, 84 mSDsluCounter, 23 mSDsCounter, 0 mSdLazyCounter, 186 mSolverCounterSat, 24 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 84 SdHoareTripleChecker+Valid, 14 SdHoareTripleChecker+Invalid, 210 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 24 IncrementalHoareTripleChecker+Valid, 186 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-11-03 02:06:54,156 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [84 Valid, 14 Invalid, 210 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [24 Valid, 186 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-11-03 02:06:54,156 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 26 states. [2022-11-03 02:06:54,158 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 26 to 24. [2022-11-03 02:06:54,158 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 24 states, 23 states have (on average 1.0869565217391304) internal successors, (25), 23 states have internal predecessors, (25), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 02:06:54,159 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 24 states to 24 states and 25 transitions. [2022-11-03 02:06:54,159 INFO L78 Accepts]: Start accepts. Automaton has 24 states and 25 transitions. Word has length 19 [2022-11-03 02:06:54,159 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-03 02:06:54,159 INFO L495 AbstractCegarLoop]: Abstraction has 24 states and 25 transitions. [2022-11-03 02:06:54,160 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 26 states, 25 states have (on average 1.72) internal successors, (43), 25 states have internal predecessors, (43), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 02:06:54,160 INFO L276 IsEmpty]: Start isEmpty. Operand 24 states and 25 transitions. [2022-11-03 02:06:54,160 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 24 [2022-11-03 02:06:54,160 INFO L187 NwaCegarLoop]: Found error trace [2022-11-03 02:06:54,160 INFO L195 NwaCegarLoop]: trace histogram [4, 3, 3, 3, 3, 3, 1, 1, 1, 1] [2022-11-03 02:06:54,209 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_81634ae4-27af-40ae-86b0-f7d8326dcf83/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Forceful destruction successful, exit code 0 [2022-11-03 02:06:54,385 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable9,7 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_81634ae4-27af-40ae-86b0-f7d8326dcf83/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-03 02:06:54,385 INFO L420 AbstractCegarLoop]: === Iteration 11 === Targeting ULTIMATE.startErr3REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 2 more)] === [2022-11-03 02:06:54,386 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-03 02:06:54,386 INFO L85 PathProgramCache]: Analyzing trace with hash -1707427160, now seen corresponding path program 5 times [2022-11-03 02:06:54,386 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-03 02:06:54,386 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1333043767] [2022-11-03 02:06:54,386 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-03 02:06:54,386 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-03 02:06:54,435 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-03 02:06:54,807 INFO L134 CoverageAnalysis]: Checked inductivity of 27 backedges. 6 proven. 21 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-03 02:06:54,807 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-03 02:06:54,808 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1333043767] [2022-11-03 02:06:54,808 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1333043767] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-03 02:06:54,808 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1115027106] [2022-11-03 02:06:54,808 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-11-03 02:06:54,808 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-03 02:06:54,808 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_81634ae4-27af-40ae-86b0-f7d8326dcf83/bin/utaipan-7li7fVZpFI/z3 [2022-11-03 02:06:54,810 INFO L229 MonitoredProcess]: Starting monitored process 8 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_81634ae4-27af-40ae-86b0-f7d8326dcf83/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-03 02:06:54,818 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_81634ae4-27af-40ae-86b0-f7d8326dcf83/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Waiting until timeout for monitored process [2022-11-03 02:06:55,042 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2022-11-03 02:06:55,042 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-03 02:06:55,044 INFO L263 TraceCheckSpWp]: Trace formula consists of 166 conjuncts, 20 conjunts are in the unsatisfiable core [2022-11-03 02:06:55,045 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-03 02:06:55,177 INFO L134 CoverageAnalysis]: Checked inductivity of 27 backedges. 6 proven. 21 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-03 02:06:55,177 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-03 02:06:55,473 INFO L134 CoverageAnalysis]: Checked inductivity of 27 backedges. 6 proven. 21 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-03 02:06:55,474 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1115027106] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-03 02:06:55,474 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1503670676] [2022-11-03 02:06:55,476 INFO L159 IcfgInterpreter]: Started Sifa with 9 locations of interest [2022-11-03 02:06:55,476 INFO L166 IcfgInterpreter]: Building call graph [2022-11-03 02:06:55,476 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-03 02:06:55,477 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-03 02:06:55,477 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-03 02:06:55,507 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 8 treesize of output 7 [2022-11-03 02:06:55,551 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2022-11-03 02:06:55,604 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-11-03 02:06:56,104 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-03 02:06:58,090 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '1189#(and (<= |ULTIMATE.start_main_~length~0#1| 2147483647) (<= |ULTIMATE.start_main_~n~0#1| 2147483647) (<= |ULTIMATE.start_cmemchr_#in~s#1.offset| 0) (= |ULTIMATE.start_main_#t~malloc8#1.offset| 0) (<= |ULTIMATE.start_cmemchr_~s#1.offset| 0) (<= 0 |ULTIMATE.start_main_~nondetArea~0#1.offset|) (<= 1 |ULTIMATE.start_main_~i~0#1|) (<= 0 |ULTIMATE.start_cmemchr_#t~post3#1.offset|) (<= 0 |ULTIMATE.start_main_~nondetArea~0#1.base|) (< (select |#length| |ULTIMATE.start_cmemchr_#t~post3#1.base|) (+ |ULTIMATE.start_cmemchr_#t~post3#1.offset| 1)) (<= 0 |ULTIMATE.start_cmemchr_#t~post3#1.base|) (<= 1 |ULTIMATE.start_cmemchr_~p~0#1.offset|) (<= |ULTIMATE.start_cmemchr_~n#1| 2147483647) (<= 0 |ULTIMATE.start_cmemchr_~s#1.base|) (<= |ULTIMATE.start_main_~c~0#1| 2147483647) (<= 0 |ULTIMATE.start_main_#t~malloc8#1.base|) (<= 0 (+ |ULTIMATE.start_cmemchr_#in~c#1| 2147483648)) (<= 0 |ULTIMATE.start_cmemchr_~s#1.offset|) (<= 1 |ULTIMATE.start_main_~n~0#1|) (<= 1 |ULTIMATE.start_main_~length~0#1|) (<= |ULTIMATE.start_cmemchr_#in~c#1| 2147483647) (= |#NULL.offset| 0) (<= 0 |ULTIMATE.start_cmemchr_~p~0#1.base|) (<= |ULTIMATE.start_cmemchr_#in~n#1| 2147483647) (<= 0 (+ |ULTIMATE.start_main_~c~0#1| 2147483648)) (<= 0 (+ |ULTIMATE.start_cmemchr_~c#1| 2147483648)) (<= 0 |ULTIMATE.start_cmemchr_#in~s#1.base|) (<= |ULTIMATE.start_main_~nondetArea~0#1.offset| 0) (<= 0 |#StackHeapBarrier|) (<= 0 |ULTIMATE.start_cmemchr_#in~s#1.offset|) (<= 1 |ULTIMATE.start_cmemchr_#in~n#1|) (<= |ULTIMATE.start_cmemchr_~c#1| 2147483647) (= |#NULL.base| 0))' at error location [2022-11-03 02:06:58,091 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-03 02:06:58,091 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-03 02:06:58,091 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 10, 10] total 21 [2022-11-03 02:06:58,091 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1352107844] [2022-11-03 02:06:58,092 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-03 02:06:58,092 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 22 states [2022-11-03 02:06:58,092 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-03 02:06:58,093 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2022-11-03 02:06:58,094 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=87, Invalid=783, Unknown=0, NotChecked=0, Total=870 [2022-11-03 02:06:58,094 INFO L87 Difference]: Start difference. First operand 24 states and 25 transitions. Second operand has 22 states, 22 states have (on average 2.1818181818181817) internal successors, (48), 21 states have internal predecessors, (48), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 02:06:58,444 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-03 02:06:58,444 INFO L93 Difference]: Finished difference Result 40 states and 41 transitions. [2022-11-03 02:06:58,444 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2022-11-03 02:06:58,445 INFO L78 Accepts]: Start accepts. Automaton has has 22 states, 22 states have (on average 2.1818181818181817) internal successors, (48), 21 states have internal predecessors, (48), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 23 [2022-11-03 02:06:58,445 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-03 02:06:58,445 INFO L225 Difference]: With dead ends: 40 [2022-11-03 02:06:58,446 INFO L226 Difference]: Without dead ends: 27 [2022-11-03 02:06:58,447 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 83 GetRequests, 48 SyntacticMatches, 1 SemanticMatches, 34 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 254 ImplicationChecksByTransitivity, 2.5s TimeCoverageRelationStatistics Valid=126, Invalid=1134, Unknown=0, NotChecked=0, Total=1260 [2022-11-03 02:06:58,447 INFO L413 NwaCegarLoop]: 9 mSDtfsCounter, 33 mSDsluCounter, 98 mSDsCounter, 0 mSdLazyCounter, 153 mSolverCounterSat, 15 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 33 SdHoareTripleChecker+Valid, 100 SdHoareTripleChecker+Invalid, 168 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 15 IncrementalHoareTripleChecker+Valid, 153 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-11-03 02:06:58,448 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [33 Valid, 100 Invalid, 168 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [15 Valid, 153 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-11-03 02:06:58,449 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 27 states. [2022-11-03 02:06:58,451 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 27 to 26. [2022-11-03 02:06:58,451 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 26 states, 25 states have (on average 1.08) internal successors, (27), 25 states have internal predecessors, (27), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 02:06:58,452 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 26 states to 26 states and 27 transitions. [2022-11-03 02:06:58,452 INFO L78 Accepts]: Start accepts. Automaton has 26 states and 27 transitions. Word has length 23 [2022-11-03 02:06:58,452 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-03 02:06:58,452 INFO L495 AbstractCegarLoop]: Abstraction has 26 states and 27 transitions. [2022-11-03 02:06:58,453 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 22 states, 22 states have (on average 2.1818181818181817) internal successors, (48), 21 states have internal predecessors, (48), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 02:06:58,453 INFO L276 IsEmpty]: Start isEmpty. Operand 26 states and 27 transitions. [2022-11-03 02:06:58,453 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 26 [2022-11-03 02:06:58,454 INFO L187 NwaCegarLoop]: Found error trace [2022-11-03 02:06:58,454 INFO L195 NwaCegarLoop]: trace histogram [4, 4, 4, 3, 3, 3, 1, 1, 1, 1] [2022-11-03 02:06:58,487 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_81634ae4-27af-40ae-86b0-f7d8326dcf83/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Forceful destruction successful, exit code 0 [2022-11-03 02:06:58,673 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable10,8 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_81634ae4-27af-40ae-86b0-f7d8326dcf83/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-03 02:06:58,673 INFO L420 AbstractCegarLoop]: === Iteration 12 === Targeting ULTIMATE.startErr3REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 2 more)] === [2022-11-03 02:06:58,674 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-03 02:06:58,674 INFO L85 PathProgramCache]: Analyzing trace with hash -1386321737, now seen corresponding path program 6 times [2022-11-03 02:06:58,674 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-03 02:06:58,674 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [467748084] [2022-11-03 02:06:58,674 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-03 02:06:58,674 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-03 02:06:58,699 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-03 02:06:59,203 INFO L134 CoverageAnalysis]: Checked inductivity of 34 backedges. 6 proven. 28 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-03 02:06:59,203 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-03 02:06:59,203 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [467748084] [2022-11-03 02:06:59,204 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [467748084] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-03 02:06:59,204 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [828359447] [2022-11-03 02:06:59,204 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-11-03 02:06:59,204 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-03 02:06:59,204 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_81634ae4-27af-40ae-86b0-f7d8326dcf83/bin/utaipan-7li7fVZpFI/z3 [2022-11-03 02:06:59,209 INFO L229 MonitoredProcess]: Starting monitored process 9 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_81634ae4-27af-40ae-86b0-f7d8326dcf83/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-03 02:06:59,236 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_81634ae4-27af-40ae-86b0-f7d8326dcf83/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Waiting until timeout for monitored process [2022-11-03 02:06:59,334 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-11-03 02:06:59,335 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-03 02:06:59,337 INFO L263 TraceCheckSpWp]: Trace formula consists of 179 conjuncts, 46 conjunts are in the unsatisfiable core [2022-11-03 02:06:59,340 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-03 02:06:59,345 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2022-11-03 02:06:59,486 INFO L134 CoverageAnalysis]: Checked inductivity of 34 backedges. 12 proven. 22 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-03 02:06:59,487 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-03 02:06:59,950 INFO L134 CoverageAnalysis]: Checked inductivity of 34 backedges. 12 proven. 22 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-03 02:06:59,950 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [828359447] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-03 02:06:59,950 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [27205052] [2022-11-03 02:06:59,953 INFO L159 IcfgInterpreter]: Started Sifa with 9 locations of interest [2022-11-03 02:06:59,953 INFO L166 IcfgInterpreter]: Building call graph [2022-11-03 02:06:59,953 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-03 02:06:59,954 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-03 02:06:59,954 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-03 02:06:59,985 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 8 treesize of output 7 [2022-11-03 02:07:00,019 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2022-11-03 02:07:00,068 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-11-03 02:07:00,548 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-03 02:07:02,401 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '1447#(and (<= |ULTIMATE.start_main_~length~0#1| 2147483647) (<= |ULTIMATE.start_main_~n~0#1| 2147483647) (<= |ULTIMATE.start_cmemchr_#in~s#1.offset| 0) (= |ULTIMATE.start_main_#t~malloc8#1.offset| 0) (<= |ULTIMATE.start_cmemchr_~s#1.offset| 0) (<= 0 |ULTIMATE.start_main_~nondetArea~0#1.offset|) (<= 1 |ULTIMATE.start_main_~i~0#1|) (<= 0 |ULTIMATE.start_cmemchr_#t~post3#1.offset|) (<= 0 |ULTIMATE.start_main_~nondetArea~0#1.base|) (< (select |#length| |ULTIMATE.start_cmemchr_#t~post3#1.base|) (+ |ULTIMATE.start_cmemchr_#t~post3#1.offset| 1)) (<= 0 |ULTIMATE.start_cmemchr_#t~post3#1.base|) (<= 1 |ULTIMATE.start_cmemchr_~p~0#1.offset|) (<= |ULTIMATE.start_cmemchr_~n#1| 2147483647) (<= 0 |ULTIMATE.start_cmemchr_~s#1.base|) (<= |ULTIMATE.start_main_~c~0#1| 2147483647) (<= 0 |ULTIMATE.start_main_#t~malloc8#1.base|) (<= 0 (+ |ULTIMATE.start_cmemchr_#in~c#1| 2147483648)) (<= 0 |ULTIMATE.start_cmemchr_~s#1.offset|) (<= 1 |ULTIMATE.start_main_~n~0#1|) (<= 1 |ULTIMATE.start_main_~length~0#1|) (<= |ULTIMATE.start_cmemchr_#in~c#1| 2147483647) (= |#NULL.offset| 0) (<= 0 |ULTIMATE.start_cmemchr_~p~0#1.base|) (<= |ULTIMATE.start_cmemchr_#in~n#1| 2147483647) (<= 0 (+ |ULTIMATE.start_main_~c~0#1| 2147483648)) (<= 0 (+ |ULTIMATE.start_cmemchr_~c#1| 2147483648)) (<= 0 |ULTIMATE.start_cmemchr_#in~s#1.base|) (<= |ULTIMATE.start_main_~nondetArea~0#1.offset| 0) (<= 0 |#StackHeapBarrier|) (<= 0 |ULTIMATE.start_cmemchr_#in~s#1.offset|) (<= 1 |ULTIMATE.start_cmemchr_#in~n#1|) (<= |ULTIMATE.start_cmemchr_~c#1| 2147483647) (= |#NULL.base| 0))' at error location [2022-11-03 02:07:02,402 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-03 02:07:02,402 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-03 02:07:02,402 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 12, 12] total 26 [2022-11-03 02:07:02,402 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1467974793] [2022-11-03 02:07:02,402 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-03 02:07:02,403 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 28 states [2022-11-03 02:07:02,403 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-03 02:07:02,404 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 28 interpolants. [2022-11-03 02:07:02,404 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=146, Invalid=1114, Unknown=0, NotChecked=0, Total=1260 [2022-11-03 02:07:02,405 INFO L87 Difference]: Start difference. First operand 26 states and 27 transitions. Second operand has 28 states, 27 states have (on average 2.037037037037037) internal successors, (55), 27 states have internal predecessors, (55), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 02:07:02,994 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-03 02:07:02,994 INFO L93 Difference]: Finished difference Result 32 states and 33 transitions. [2022-11-03 02:07:02,995 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2022-11-03 02:07:02,995 INFO L78 Accepts]: Start accepts. Automaton has has 28 states, 27 states have (on average 2.037037037037037) internal successors, (55), 27 states have internal predecessors, (55), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 25 [2022-11-03 02:07:02,995 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-03 02:07:02,996 INFO L225 Difference]: With dead ends: 32 [2022-11-03 02:07:02,996 INFO L226 Difference]: Without dead ends: 32 [2022-11-03 02:07:02,997 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 97 GetRequests, 51 SyntacticMatches, 0 SemanticMatches, 46 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 413 ImplicationChecksByTransitivity, 2.7s TimeCoverageRelationStatistics Valid=374, Invalid=1882, Unknown=0, NotChecked=0, Total=2256 [2022-11-03 02:07:02,998 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 97 mSDsluCounter, 38 mSDsCounter, 0 mSdLazyCounter, 276 mSolverCounterSat, 27 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 97 SdHoareTripleChecker+Valid, 24 SdHoareTripleChecker+Invalid, 303 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 27 IncrementalHoareTripleChecker+Valid, 276 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-11-03 02:07:02,998 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [97 Valid, 24 Invalid, 303 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [27 Valid, 276 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-11-03 02:07:02,999 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 32 states. [2022-11-03 02:07:03,001 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 32 to 30. [2022-11-03 02:07:03,001 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 30 states, 29 states have (on average 1.0689655172413792) internal successors, (31), 29 states have internal predecessors, (31), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 02:07:03,002 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 30 states to 30 states and 31 transitions. [2022-11-03 02:07:03,002 INFO L78 Accepts]: Start accepts. Automaton has 30 states and 31 transitions. Word has length 25 [2022-11-03 02:07:03,002 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-03 02:07:03,003 INFO L495 AbstractCegarLoop]: Abstraction has 30 states and 31 transitions. [2022-11-03 02:07:03,003 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 28 states, 27 states have (on average 2.037037037037037) internal successors, (55), 27 states have internal predecessors, (55), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 02:07:03,003 INFO L276 IsEmpty]: Start isEmpty. Operand 30 states and 31 transitions. [2022-11-03 02:07:03,004 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 30 [2022-11-03 02:07:03,004 INFO L187 NwaCegarLoop]: Found error trace [2022-11-03 02:07:03,004 INFO L195 NwaCegarLoop]: trace histogram [5, 4, 4, 4, 4, 4, 1, 1, 1, 1] [2022-11-03 02:07:03,033 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_81634ae4-27af-40ae-86b0-f7d8326dcf83/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Forceful destruction successful, exit code 0 [2022-11-03 02:07:03,209 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_81634ae4-27af-40ae-86b0-f7d8326dcf83/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable11 [2022-11-03 02:07:03,209 INFO L420 AbstractCegarLoop]: === Iteration 13 === Targeting ULTIMATE.startErr3REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 2 more)] === [2022-11-03 02:07:03,209 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-03 02:07:03,209 INFO L85 PathProgramCache]: Analyzing trace with hash -1845324697, now seen corresponding path program 7 times [2022-11-03 02:07:03,209 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-03 02:07:03,210 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1930014097] [2022-11-03 02:07:03,210 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-03 02:07:03,210 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-03 02:07:03,237 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-03 02:07:03,606 INFO L134 CoverageAnalysis]: Checked inductivity of 48 backedges. 8 proven. 40 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-03 02:07:03,607 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-03 02:07:03,607 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1930014097] [2022-11-03 02:07:03,607 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1930014097] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-03 02:07:03,608 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [651372008] [2022-11-03 02:07:03,608 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-11-03 02:07:03,608 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-03 02:07:03,608 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_81634ae4-27af-40ae-86b0-f7d8326dcf83/bin/utaipan-7li7fVZpFI/z3 [2022-11-03 02:07:03,609 INFO L229 MonitoredProcess]: Starting monitored process 10 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_81634ae4-27af-40ae-86b0-f7d8326dcf83/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-03 02:07:03,632 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_81634ae4-27af-40ae-86b0-f7d8326dcf83/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Waiting until timeout for monitored process [2022-11-03 02:07:03,793 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-03 02:07:03,795 INFO L263 TraceCheckSpWp]: Trace formula consists of 199 conjuncts, 24 conjunts are in the unsatisfiable core [2022-11-03 02:07:03,798 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-03 02:07:03,938 INFO L134 CoverageAnalysis]: Checked inductivity of 48 backedges. 8 proven. 40 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-03 02:07:03,939 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-03 02:07:04,354 INFO L134 CoverageAnalysis]: Checked inductivity of 48 backedges. 8 proven. 40 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-03 02:07:04,354 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [651372008] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-03 02:07:04,354 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1981641574] [2022-11-03 02:07:04,356 INFO L159 IcfgInterpreter]: Started Sifa with 9 locations of interest [2022-11-03 02:07:04,356 INFO L166 IcfgInterpreter]: Building call graph [2022-11-03 02:07:04,357 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-03 02:07:04,357 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-03 02:07:04,357 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-03 02:07:04,388 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 8 treesize of output 7 [2022-11-03 02:07:04,437 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-11-03 02:07:04,505 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-11-03 02:07:04,956 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-03 02:07:06,941 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '1735#(and (<= |ULTIMATE.start_main_~length~0#1| 2147483647) (<= |ULTIMATE.start_main_~n~0#1| 2147483647) (<= |ULTIMATE.start_cmemchr_#in~s#1.offset| 0) (= |ULTIMATE.start_main_#t~malloc8#1.offset| 0) (<= |ULTIMATE.start_cmemchr_~s#1.offset| 0) (<= 0 |ULTIMATE.start_main_~nondetArea~0#1.offset|) (<= 1 |ULTIMATE.start_main_~i~0#1|) (<= 0 |ULTIMATE.start_cmemchr_#t~post3#1.offset|) (<= 0 |ULTIMATE.start_main_~nondetArea~0#1.base|) (< (select |#length| |ULTIMATE.start_cmemchr_#t~post3#1.base|) (+ |ULTIMATE.start_cmemchr_#t~post3#1.offset| 1)) (<= 0 |ULTIMATE.start_cmemchr_#t~post3#1.base|) (<= 1 |ULTIMATE.start_cmemchr_~p~0#1.offset|) (<= |ULTIMATE.start_cmemchr_~n#1| 2147483647) (<= 0 |ULTIMATE.start_cmemchr_~s#1.base|) (<= |ULTIMATE.start_main_~c~0#1| 2147483647) (<= 0 |ULTIMATE.start_main_#t~malloc8#1.base|) (<= 0 (+ |ULTIMATE.start_cmemchr_#in~c#1| 2147483648)) (<= 0 |ULTIMATE.start_cmemchr_~s#1.offset|) (<= 1 |ULTIMATE.start_main_~n~0#1|) (<= 1 |ULTIMATE.start_main_~length~0#1|) (<= |ULTIMATE.start_cmemchr_#in~c#1| 2147483647) (= |#NULL.offset| 0) (<= 0 |ULTIMATE.start_cmemchr_~p~0#1.base|) (<= |ULTIMATE.start_cmemchr_#in~n#1| 2147483647) (<= 0 (+ |ULTIMATE.start_main_~c~0#1| 2147483648)) (<= 0 (+ |ULTIMATE.start_cmemchr_~c#1| 2147483648)) (<= 0 |ULTIMATE.start_cmemchr_#in~s#1.base|) (<= |ULTIMATE.start_main_~nondetArea~0#1.offset| 0) (<= 0 |#StackHeapBarrier|) (<= 0 |ULTIMATE.start_cmemchr_#in~s#1.offset|) (<= 1 |ULTIMATE.start_cmemchr_#in~n#1|) (<= |ULTIMATE.start_cmemchr_~c#1| 2147483647) (= |#NULL.base| 0))' at error location [2022-11-03 02:07:06,942 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-03 02:07:06,942 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-03 02:07:06,942 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 12, 12] total 25 [2022-11-03 02:07:06,942 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2111320180] [2022-11-03 02:07:06,942 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-03 02:07:06,943 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 26 states [2022-11-03 02:07:06,943 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-03 02:07:06,944 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2022-11-03 02:07:06,944 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=97, Invalid=1025, Unknown=0, NotChecked=0, Total=1122 [2022-11-03 02:07:06,944 INFO L87 Difference]: Start difference. First operand 30 states and 31 transitions. Second operand has 26 states, 26 states have (on average 2.3076923076923075) internal successors, (60), 25 states have internal predecessors, (60), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 02:07:07,424 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-03 02:07:07,424 INFO L93 Difference]: Finished difference Result 50 states and 51 transitions. [2022-11-03 02:07:07,424 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2022-11-03 02:07:07,424 INFO L78 Accepts]: Start accepts. Automaton has has 26 states, 26 states have (on average 2.3076923076923075) internal successors, (60), 25 states have internal predecessors, (60), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 29 [2022-11-03 02:07:07,425 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-03 02:07:07,425 INFO L225 Difference]: With dead ends: 50 [2022-11-03 02:07:07,425 INFO L226 Difference]: Without dead ends: 33 [2022-11-03 02:07:07,426 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 105 GetRequests, 64 SyntacticMatches, 1 SemanticMatches, 40 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 326 ImplicationChecksByTransitivity, 2.7s TimeCoverageRelationStatistics Valid=148, Invalid=1574, Unknown=0, NotChecked=0, Total=1722 [2022-11-03 02:07:07,427 INFO L413 NwaCegarLoop]: 12 mSDtfsCounter, 29 mSDsluCounter, 177 mSDsCounter, 0 mSdLazyCounter, 257 mSolverCounterSat, 14 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 29 SdHoareTripleChecker+Valid, 178 SdHoareTripleChecker+Invalid, 271 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 14 IncrementalHoareTripleChecker+Valid, 257 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-11-03 02:07:07,427 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [29 Valid, 178 Invalid, 271 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [14 Valid, 257 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-11-03 02:07:07,428 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 33 states. [2022-11-03 02:07:07,430 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 33 to 32. [2022-11-03 02:07:07,430 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 32 states, 31 states have (on average 1.064516129032258) internal successors, (33), 31 states have internal predecessors, (33), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 02:07:07,430 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 32 states to 32 states and 33 transitions. [2022-11-03 02:07:07,431 INFO L78 Accepts]: Start accepts. Automaton has 32 states and 33 transitions. Word has length 29 [2022-11-03 02:07:07,431 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-03 02:07:07,431 INFO L495 AbstractCegarLoop]: Abstraction has 32 states and 33 transitions. [2022-11-03 02:07:07,431 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 26 states, 26 states have (on average 2.3076923076923075) internal successors, (60), 25 states have internal predecessors, (60), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 02:07:07,431 INFO L276 IsEmpty]: Start isEmpty. Operand 32 states and 33 transitions. [2022-11-03 02:07:07,432 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 32 [2022-11-03 02:07:07,432 INFO L187 NwaCegarLoop]: Found error trace [2022-11-03 02:07:07,433 INFO L195 NwaCegarLoop]: trace histogram [5, 5, 5, 4, 4, 4, 1, 1, 1, 1] [2022-11-03 02:07:07,476 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_81634ae4-27af-40ae-86b0-f7d8326dcf83/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Forceful destruction successful, exit code 0 [2022-11-03 02:07:07,649 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 10 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_81634ae4-27af-40ae-86b0-f7d8326dcf83/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable12 [2022-11-03 02:07:07,649 INFO L420 AbstractCegarLoop]: === Iteration 14 === Targeting ULTIMATE.startErr3REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 2 more)] === [2022-11-03 02:07:07,649 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-03 02:07:07,650 INFO L85 PathProgramCache]: Analyzing trace with hash 346635062, now seen corresponding path program 8 times [2022-11-03 02:07:07,650 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-03 02:07:07,650 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2078057351] [2022-11-03 02:07:07,650 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-03 02:07:07,650 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-03 02:07:07,674 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-03 02:07:08,311 INFO L134 CoverageAnalysis]: Checked inductivity of 57 backedges. 12 proven. 45 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-03 02:07:08,311 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-03 02:07:08,312 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2078057351] [2022-11-03 02:07:08,312 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2078057351] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-03 02:07:08,312 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2035760989] [2022-11-03 02:07:08,312 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-11-03 02:07:08,312 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-03 02:07:08,312 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_81634ae4-27af-40ae-86b0-f7d8326dcf83/bin/utaipan-7li7fVZpFI/z3 [2022-11-03 02:07:08,317 INFO L229 MonitoredProcess]: Starting monitored process 11 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_81634ae4-27af-40ae-86b0-f7d8326dcf83/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-03 02:07:08,348 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_81634ae4-27af-40ae-86b0-f7d8326dcf83/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Waiting until timeout for monitored process [2022-11-03 02:07:08,830 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 5 check-sat command(s) [2022-11-03 02:07:08,830 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-03 02:07:08,833 INFO L263 TraceCheckSpWp]: Trace formula consists of 199 conjuncts, 79 conjunts are in the unsatisfiable core [2022-11-03 02:07:08,835 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-03 02:07:08,851 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2022-11-03 02:07:10,219 INFO L134 CoverageAnalysis]: Checked inductivity of 57 backedges. 3 proven. 45 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2022-11-03 02:07:10,219 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-03 02:07:12,035 INFO L134 CoverageAnalysis]: Checked inductivity of 57 backedges. 11 proven. 37 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2022-11-03 02:07:12,035 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2035760989] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-03 02:07:12,035 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1473689199] [2022-11-03 02:07:12,037 INFO L159 IcfgInterpreter]: Started Sifa with 9 locations of interest [2022-11-03 02:07:12,037 INFO L166 IcfgInterpreter]: Building call graph [2022-11-03 02:07:12,038 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-03 02:07:12,038 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-03 02:07:12,038 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-03 02:07:12,071 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 8 treesize of output 7 [2022-11-03 02:07:12,101 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2022-11-03 02:07:12,137 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-11-03 02:07:12,612 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-03 02:07:15,236 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '2071#(and (<= |ULTIMATE.start_main_~length~0#1| 2147483647) (<= |ULTIMATE.start_main_~n~0#1| 2147483647) (<= |ULTIMATE.start_cmemchr_#in~s#1.offset| 0) (= |ULTIMATE.start_main_#t~malloc8#1.offset| 0) (<= |ULTIMATE.start_cmemchr_~s#1.offset| 0) (<= 0 |ULTIMATE.start_main_~nondetArea~0#1.offset|) (<= 1 |ULTIMATE.start_main_~i~0#1|) (<= 0 |ULTIMATE.start_cmemchr_#t~post3#1.offset|) (<= 0 |ULTIMATE.start_main_~nondetArea~0#1.base|) (< (select |#length| |ULTIMATE.start_cmemchr_#t~post3#1.base|) (+ |ULTIMATE.start_cmemchr_#t~post3#1.offset| 1)) (<= 0 |ULTIMATE.start_cmemchr_#t~post3#1.base|) (<= 1 |ULTIMATE.start_cmemchr_~p~0#1.offset|) (<= |ULTIMATE.start_cmemchr_~n#1| 2147483647) (<= 0 |ULTIMATE.start_cmemchr_~s#1.base|) (<= |ULTIMATE.start_main_~c~0#1| 2147483647) (<= 0 |ULTIMATE.start_main_#t~malloc8#1.base|) (<= 0 (+ |ULTIMATE.start_cmemchr_#in~c#1| 2147483648)) (<= 0 |ULTIMATE.start_cmemchr_~s#1.offset|) (<= 1 |ULTIMATE.start_main_~n~0#1|) (<= 1 |ULTIMATE.start_main_~length~0#1|) (<= |ULTIMATE.start_cmemchr_#in~c#1| 2147483647) (= |#NULL.offset| 0) (<= 0 |ULTIMATE.start_cmemchr_~p~0#1.base|) (<= |ULTIMATE.start_cmemchr_#in~n#1| 2147483647) (<= 0 (+ |ULTIMATE.start_main_~c~0#1| 2147483648)) (<= 0 (+ |ULTIMATE.start_cmemchr_~c#1| 2147483648)) (<= 0 |ULTIMATE.start_cmemchr_#in~s#1.base|) (<= |ULTIMATE.start_main_~nondetArea~0#1.offset| 0) (<= 0 |#StackHeapBarrier|) (<= 0 |ULTIMATE.start_cmemchr_#in~s#1.offset|) (<= 1 |ULTIMATE.start_cmemchr_#in~n#1|) (<= |ULTIMATE.start_cmemchr_~c#1| 2147483647) (= |#NULL.base| 0))' at error location [2022-11-03 02:07:15,236 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-03 02:07:15,236 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-03 02:07:15,237 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 17, 17] total 48 [2022-11-03 02:07:15,237 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [116374339] [2022-11-03 02:07:15,237 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-03 02:07:15,238 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 50 states [2022-11-03 02:07:15,238 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-03 02:07:15,239 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 50 interpolants. [2022-11-03 02:07:15,240 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=275, Invalid=3031, Unknown=0, NotChecked=0, Total=3306 [2022-11-03 02:07:15,240 INFO L87 Difference]: Start difference. First operand 32 states and 33 transitions. Second operand has 50 states, 49 states have (on average 1.7346938775510203) internal successors, (85), 49 states have internal predecessors, (85), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 02:07:19,889 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-03 02:07:19,889 INFO L93 Difference]: Finished difference Result 53 states and 54 transitions. [2022-11-03 02:07:19,889 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 35 states. [2022-11-03 02:07:19,890 INFO L78 Accepts]: Start accepts. Automaton has has 50 states, 49 states have (on average 1.7346938775510203) internal successors, (85), 49 states have internal predecessors, (85), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 31 [2022-11-03 02:07:19,890 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-03 02:07:19,891 INFO L225 Difference]: With dead ends: 53 [2022-11-03 02:07:19,891 INFO L226 Difference]: Without dead ends: 53 [2022-11-03 02:07:19,893 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 136 GetRequests, 49 SyntacticMatches, 0 SemanticMatches, 87 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1258 ImplicationChecksByTransitivity, 8.8s TimeCoverageRelationStatistics Valid=1168, Invalid=6664, Unknown=0, NotChecked=0, Total=7832 [2022-11-03 02:07:19,894 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 168 mSDsluCounter, 48 mSDsCounter, 0 mSdLazyCounter, 711 mSolverCounterSat, 206 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.8s Time, 0 mProtectedPredicate, 0 mProtectedAction, 168 SdHoareTripleChecker+Valid, 51 SdHoareTripleChecker+Invalid, 917 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 206 IncrementalHoareTripleChecker+Valid, 711 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.9s IncrementalHoareTripleChecker+Time [2022-11-03 02:07:19,894 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [168 Valid, 51 Invalid, 917 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [206 Valid, 711 Invalid, 0 Unknown, 0 Unchecked, 0.9s Time] [2022-11-03 02:07:19,895 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 53 states. [2022-11-03 02:07:19,897 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 53 to 52. [2022-11-03 02:07:19,898 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 52 states, 51 states have (on average 1.0392156862745099) internal successors, (53), 51 states have internal predecessors, (53), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 02:07:19,899 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 52 states to 52 states and 53 transitions. [2022-11-03 02:07:19,899 INFO L78 Accepts]: Start accepts. Automaton has 52 states and 53 transitions. Word has length 31 [2022-11-03 02:07:19,899 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-03 02:07:19,899 INFO L495 AbstractCegarLoop]: Abstraction has 52 states and 53 transitions. [2022-11-03 02:07:19,900 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 50 states, 49 states have (on average 1.7346938775510203) internal successors, (85), 49 states have internal predecessors, (85), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 02:07:19,900 INFO L276 IsEmpty]: Start isEmpty. Operand 52 states and 53 transitions. [2022-11-03 02:07:19,901 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 52 [2022-11-03 02:07:19,901 INFO L187 NwaCegarLoop]: Found error trace [2022-11-03 02:07:19,901 INFO L195 NwaCegarLoop]: trace histogram [10, 9, 9, 9, 5, 5, 1, 1, 1, 1] [2022-11-03 02:07:19,927 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_81634ae4-27af-40ae-86b0-f7d8326dcf83/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Forceful destruction successful, exit code 0 [2022-11-03 02:07:20,109 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable13,11 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_81634ae4-27af-40ae-86b0-f7d8326dcf83/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-03 02:07:20,109 INFO L420 AbstractCegarLoop]: === Iteration 15 === Targeting ULTIMATE.startErr3REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 2 more)] === [2022-11-03 02:07:20,109 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-03 02:07:20,110 INFO L85 PathProgramCache]: Analyzing trace with hash 380989478, now seen corresponding path program 9 times [2022-11-03 02:07:20,110 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-03 02:07:20,110 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1681184601] [2022-11-03 02:07:20,110 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-03 02:07:20,110 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-03 02:07:20,163 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-03 02:07:20,653 INFO L134 CoverageAnalysis]: Checked inductivity of 187 backedges. 90 proven. 65 refuted. 0 times theorem prover too weak. 32 trivial. 0 not checked. [2022-11-03 02:07:20,654 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-03 02:07:20,654 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1681184601] [2022-11-03 02:07:20,654 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1681184601] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-03 02:07:20,654 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [579896392] [2022-11-03 02:07:20,654 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-11-03 02:07:20,654 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-03 02:07:20,655 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_81634ae4-27af-40ae-86b0-f7d8326dcf83/bin/utaipan-7li7fVZpFI/z3 [2022-11-03 02:07:20,657 INFO L229 MonitoredProcess]: Starting monitored process 12 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_81634ae4-27af-40ae-86b0-f7d8326dcf83/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-03 02:07:20,680 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_81634ae4-27af-40ae-86b0-f7d8326dcf83/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Waiting until timeout for monitored process [2022-11-03 02:07:20,852 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-11-03 02:07:20,852 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-03 02:07:20,856 INFO L263 TraceCheckSpWp]: Trace formula consists of 312 conjuncts, 66 conjunts are in the unsatisfiable core [2022-11-03 02:07:20,859 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-03 02:07:20,869 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2022-11-03 02:07:21,560 INFO L134 CoverageAnalysis]: Checked inductivity of 187 backedges. 133 proven. 30 refuted. 0 times theorem prover too weak. 24 trivial. 0 not checked. [2022-11-03 02:07:21,561 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-03 02:07:22,366 INFO L134 CoverageAnalysis]: Checked inductivity of 187 backedges. 133 proven. 30 refuted. 0 times theorem prover too weak. 24 trivial. 0 not checked. [2022-11-03 02:07:22,366 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [579896392] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-03 02:07:22,367 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1367812722] [2022-11-03 02:07:22,368 INFO L159 IcfgInterpreter]: Started Sifa with 9 locations of interest [2022-11-03 02:07:22,369 INFO L166 IcfgInterpreter]: Building call graph [2022-11-03 02:07:22,369 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-03 02:07:22,369 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-03 02:07:22,369 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-03 02:07:22,407 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 8 treesize of output 7 [2022-11-03 02:07:22,437 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2022-11-03 02:07:22,476 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-11-03 02:07:22,919 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-03 02:07:25,163 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '2591#(and (<= |ULTIMATE.start_main_~length~0#1| 2147483647) (<= |ULTIMATE.start_main_~n~0#1| 2147483647) (<= |ULTIMATE.start_cmemchr_#in~s#1.offset| 0) (= |ULTIMATE.start_main_#t~malloc8#1.offset| 0) (<= |ULTIMATE.start_cmemchr_~s#1.offset| 0) (<= 0 |ULTIMATE.start_main_~nondetArea~0#1.offset|) (<= 1 |ULTIMATE.start_main_~i~0#1|) (<= 0 |ULTIMATE.start_cmemchr_#t~post3#1.offset|) (<= 0 |ULTIMATE.start_main_~nondetArea~0#1.base|) (< (select |#length| |ULTIMATE.start_cmemchr_#t~post3#1.base|) (+ |ULTIMATE.start_cmemchr_#t~post3#1.offset| 1)) (<= 0 |ULTIMATE.start_cmemchr_#t~post3#1.base|) (<= 1 |ULTIMATE.start_cmemchr_~p~0#1.offset|) (<= |ULTIMATE.start_cmemchr_~n#1| 2147483647) (<= 0 |ULTIMATE.start_cmemchr_~s#1.base|) (<= |ULTIMATE.start_main_~c~0#1| 2147483647) (<= 0 |ULTIMATE.start_main_#t~malloc8#1.base|) (<= 0 (+ |ULTIMATE.start_cmemchr_#in~c#1| 2147483648)) (<= 0 |ULTIMATE.start_cmemchr_~s#1.offset|) (<= 1 |ULTIMATE.start_main_~n~0#1|) (<= 1 |ULTIMATE.start_main_~length~0#1|) (<= |ULTIMATE.start_cmemchr_#in~c#1| 2147483647) (= |#NULL.offset| 0) (<= 0 |ULTIMATE.start_cmemchr_~p~0#1.base|) (<= |ULTIMATE.start_cmemchr_#in~n#1| 2147483647) (<= 0 (+ |ULTIMATE.start_main_~c~0#1| 2147483648)) (<= 0 (+ |ULTIMATE.start_cmemchr_~c#1| 2147483648)) (<= 0 |ULTIMATE.start_cmemchr_#in~s#1.base|) (<= |ULTIMATE.start_main_~nondetArea~0#1.offset| 0) (<= 0 |#StackHeapBarrier|) (<= 0 |ULTIMATE.start_cmemchr_#in~s#1.offset|) (<= 1 |ULTIMATE.start_cmemchr_#in~n#1|) (<= |ULTIMATE.start_cmemchr_~c#1| 2147483647) (= |#NULL.base| 0))' at error location [2022-11-03 02:07:25,164 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-03 02:07:25,164 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-03 02:07:25,164 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 16, 16] total 44 [2022-11-03 02:07:25,164 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1198690196] [2022-11-03 02:07:25,164 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-03 02:07:25,165 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 45 states [2022-11-03 02:07:25,165 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-03 02:07:25,165 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 45 interpolants. [2022-11-03 02:07:25,166 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=206, Invalid=2550, Unknown=0, NotChecked=0, Total=2756 [2022-11-03 02:07:25,167 INFO L87 Difference]: Start difference. First operand 52 states and 53 transitions. Second operand has 45 states, 45 states have (on average 2.4) internal successors, (108), 44 states have internal predecessors, (108), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 02:07:27,475 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-03 02:07:27,475 INFO L93 Difference]: Finished difference Result 76 states and 77 transitions. [2022-11-03 02:07:27,476 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2022-11-03 02:07:27,476 INFO L78 Accepts]: Start accepts. Automaton has has 45 states, 45 states have (on average 2.4) internal successors, (108), 44 states have internal predecessors, (108), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 51 [2022-11-03 02:07:27,476 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-03 02:07:27,477 INFO L225 Difference]: With dead ends: 76 [2022-11-03 02:07:27,477 INFO L226 Difference]: Without dead ends: 55 [2022-11-03 02:07:27,479 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 183 GetRequests, 114 SyntacticMatches, 0 SemanticMatches, 69 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1117 ImplicationChecksByTransitivity, 5.3s TimeCoverageRelationStatistics Valid=531, Invalid=4439, Unknown=0, NotChecked=0, Total=4970 [2022-11-03 02:07:27,479 INFO L413 NwaCegarLoop]: 4 mSDtfsCounter, 103 mSDsluCounter, 100 mSDsCounter, 0 mSdLazyCounter, 666 mSolverCounterSat, 78 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 103 SdHoareTripleChecker+Valid, 90 SdHoareTripleChecker+Invalid, 744 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 78 IncrementalHoareTripleChecker+Valid, 666 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2022-11-03 02:07:27,480 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [103 Valid, 90 Invalid, 744 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [78 Valid, 666 Invalid, 0 Unknown, 0 Unchecked, 0.5s Time] [2022-11-03 02:07:27,480 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 55 states. [2022-11-03 02:07:27,483 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 55 to 54. [2022-11-03 02:07:27,483 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 54 states, 53 states have (on average 1.0377358490566038) internal successors, (55), 53 states have internal predecessors, (55), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 02:07:27,484 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 54 states to 54 states and 55 transitions. [2022-11-03 02:07:27,484 INFO L78 Accepts]: Start accepts. Automaton has 54 states and 55 transitions. Word has length 51 [2022-11-03 02:07:27,484 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-03 02:07:27,484 INFO L495 AbstractCegarLoop]: Abstraction has 54 states and 55 transitions. [2022-11-03 02:07:27,485 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 45 states, 45 states have (on average 2.4) internal successors, (108), 44 states have internal predecessors, (108), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 02:07:27,485 INFO L276 IsEmpty]: Start isEmpty. Operand 54 states and 55 transitions. [2022-11-03 02:07:27,485 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 54 [2022-11-03 02:07:27,486 INFO L187 NwaCegarLoop]: Found error trace [2022-11-03 02:07:27,486 INFO L195 NwaCegarLoop]: trace histogram [10, 9, 9, 9, 6, 6, 1, 1, 1, 1] [2022-11-03 02:07:27,536 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_81634ae4-27af-40ae-86b0-f7d8326dcf83/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Forceful destruction successful, exit code 0 [2022-11-03 02:07:27,709 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 12 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_81634ae4-27af-40ae-86b0-f7d8326dcf83/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable14 [2022-11-03 02:07:27,709 INFO L420 AbstractCegarLoop]: === Iteration 16 === Targeting ULTIMATE.startErr3REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 2 more)] === [2022-11-03 02:07:27,709 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-03 02:07:27,709 INFO L85 PathProgramCache]: Analyzing trace with hash -1604943435, now seen corresponding path program 10 times [2022-11-03 02:07:27,710 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-03 02:07:27,710 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [473401141] [2022-11-03 02:07:27,710 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-03 02:07:27,710 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-03 02:07:27,772 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-03 02:07:28,359 INFO L134 CoverageAnalysis]: Checked inductivity of 198 backedges. 84 proven. 96 refuted. 0 times theorem prover too weak. 18 trivial. 0 not checked. [2022-11-03 02:07:28,359 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-03 02:07:28,359 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [473401141] [2022-11-03 02:07:28,359 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [473401141] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-03 02:07:28,359 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1989579731] [2022-11-03 02:07:28,360 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-11-03 02:07:28,360 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-03 02:07:28,360 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_81634ae4-27af-40ae-86b0-f7d8326dcf83/bin/utaipan-7li7fVZpFI/z3 [2022-11-03 02:07:28,361 INFO L229 MonitoredProcess]: Starting monitored process 13 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_81634ae4-27af-40ae-86b0-f7d8326dcf83/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-03 02:07:28,384 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_81634ae4-27af-40ae-86b0-f7d8326dcf83/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Waiting until timeout for monitored process [2022-11-03 02:07:28,518 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-03 02:07:28,521 INFO L263 TraceCheckSpWp]: Trace formula consists of 325 conjuncts, 74 conjunts are in the unsatisfiable core [2022-11-03 02:07:28,525 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-03 02:07:28,546 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2022-11-03 02:07:29,407 INFO L134 CoverageAnalysis]: Checked inductivity of 198 backedges. 144 proven. 42 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2022-11-03 02:07:29,408 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-03 02:07:30,367 INFO L134 CoverageAnalysis]: Checked inductivity of 198 backedges. 144 proven. 42 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2022-11-03 02:07:30,367 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1989579731] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-03 02:07:30,367 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [2023468564] [2022-11-03 02:07:30,368 INFO L159 IcfgInterpreter]: Started Sifa with 9 locations of interest [2022-11-03 02:07:30,369 INFO L166 IcfgInterpreter]: Building call graph [2022-11-03 02:07:30,369 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-03 02:07:30,369 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-03 02:07:30,369 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-03 02:07:30,396 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 8 treesize of output 7 [2022-11-03 02:07:30,424 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-11-03 02:07:30,468 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-11-03 02:07:30,872 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-03 02:07:33,212 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '3128#(and (<= |ULTIMATE.start_main_~length~0#1| 2147483647) (<= |ULTIMATE.start_main_~n~0#1| 2147483647) (<= |ULTIMATE.start_cmemchr_#in~s#1.offset| 0) (= |ULTIMATE.start_main_#t~malloc8#1.offset| 0) (<= |ULTIMATE.start_cmemchr_~s#1.offset| 0) (<= 0 |ULTIMATE.start_main_~nondetArea~0#1.offset|) (<= 1 |ULTIMATE.start_main_~i~0#1|) (<= 0 |ULTIMATE.start_cmemchr_#t~post3#1.offset|) (<= 0 |ULTIMATE.start_main_~nondetArea~0#1.base|) (< (select |#length| |ULTIMATE.start_cmemchr_#t~post3#1.base|) (+ |ULTIMATE.start_cmemchr_#t~post3#1.offset| 1)) (<= 0 |ULTIMATE.start_cmemchr_#t~post3#1.base|) (<= 1 |ULTIMATE.start_cmemchr_~p~0#1.offset|) (<= |ULTIMATE.start_cmemchr_~n#1| 2147483647) (<= 0 |ULTIMATE.start_cmemchr_~s#1.base|) (<= |ULTIMATE.start_main_~c~0#1| 2147483647) (<= 0 |ULTIMATE.start_main_#t~malloc8#1.base|) (<= 0 (+ |ULTIMATE.start_cmemchr_#in~c#1| 2147483648)) (<= 0 |ULTIMATE.start_cmemchr_~s#1.offset|) (<= 1 |ULTIMATE.start_main_~n~0#1|) (<= 1 |ULTIMATE.start_main_~length~0#1|) (<= |ULTIMATE.start_cmemchr_#in~c#1| 2147483647) (= |#NULL.offset| 0) (<= 0 |ULTIMATE.start_cmemchr_~p~0#1.base|) (<= |ULTIMATE.start_cmemchr_#in~n#1| 2147483647) (<= 0 (+ |ULTIMATE.start_main_~c~0#1| 2147483648)) (<= 0 (+ |ULTIMATE.start_cmemchr_~c#1| 2147483648)) (<= 0 |ULTIMATE.start_cmemchr_#in~s#1.base|) (<= |ULTIMATE.start_main_~nondetArea~0#1.offset| 0) (<= 0 |#StackHeapBarrier|) (<= 0 |ULTIMATE.start_cmemchr_#in~s#1.offset|) (<= 1 |ULTIMATE.start_cmemchr_#in~n#1|) (<= |ULTIMATE.start_cmemchr_~c#1| 2147483647) (= |#NULL.base| 0))' at error location [2022-11-03 02:07:33,212 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-03 02:07:33,212 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-03 02:07:33,213 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 18, 18] total 50 [2022-11-03 02:07:33,213 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [301227356] [2022-11-03 02:07:33,213 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-03 02:07:33,214 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 51 states [2022-11-03 02:07:33,214 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-03 02:07:33,214 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 51 interpolants. [2022-11-03 02:07:33,215 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=245, Invalid=3177, Unknown=0, NotChecked=0, Total=3422 [2022-11-03 02:07:33,216 INFO L87 Difference]: Start difference. First operand 54 states and 55 transitions. Second operand has 51 states, 51 states have (on average 2.4705882352941178) internal successors, (126), 50 states have internal predecessors, (126), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 02:07:36,288 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-03 02:07:36,288 INFO L93 Difference]: Finished difference Result 82 states and 83 transitions. [2022-11-03 02:07:36,289 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 26 states. [2022-11-03 02:07:36,289 INFO L78 Accepts]: Start accepts. Automaton has has 51 states, 51 states have (on average 2.4705882352941178) internal successors, (126), 50 states have internal predecessors, (126), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 53 [2022-11-03 02:07:36,289 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-03 02:07:36,290 INFO L225 Difference]: With dead ends: 82 [2022-11-03 02:07:36,290 INFO L226 Difference]: Without dead ends: 57 [2022-11-03 02:07:36,292 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 194 GetRequests, 116 SyntacticMatches, 0 SemanticMatches, 78 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1407 ImplicationChecksByTransitivity, 6.3s TimeCoverageRelationStatistics Valid=656, Invalid=5664, Unknown=0, NotChecked=0, Total=6320 [2022-11-03 02:07:36,293 INFO L413 NwaCegarLoop]: 5 mSDtfsCounter, 123 mSDsluCounter, 133 mSDsCounter, 0 mSdLazyCounter, 888 mSolverCounterSat, 94 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 123 SdHoareTripleChecker+Valid, 123 SdHoareTripleChecker+Invalid, 982 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 94 IncrementalHoareTripleChecker+Valid, 888 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.7s IncrementalHoareTripleChecker+Time [2022-11-03 02:07:36,293 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [123 Valid, 123 Invalid, 982 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [94 Valid, 888 Invalid, 0 Unknown, 0 Unchecked, 0.7s Time] [2022-11-03 02:07:36,294 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 57 states. [2022-11-03 02:07:36,298 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 57 to 56. [2022-11-03 02:07:36,298 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 56 states, 55 states have (on average 1.0363636363636364) internal successors, (57), 55 states have internal predecessors, (57), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 02:07:36,299 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 56 states to 56 states and 57 transitions. [2022-11-03 02:07:36,300 INFO L78 Accepts]: Start accepts. Automaton has 56 states and 57 transitions. Word has length 53 [2022-11-03 02:07:36,300 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-03 02:07:36,300 INFO L495 AbstractCegarLoop]: Abstraction has 56 states and 57 transitions. [2022-11-03 02:07:36,301 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 51 states, 51 states have (on average 2.4705882352941178) internal successors, (126), 50 states have internal predecessors, (126), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 02:07:36,301 INFO L276 IsEmpty]: Start isEmpty. Operand 56 states and 57 transitions. [2022-11-03 02:07:36,305 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 56 [2022-11-03 02:07:36,307 INFO L187 NwaCegarLoop]: Found error trace [2022-11-03 02:07:36,308 INFO L195 NwaCegarLoop]: trace histogram [10, 9, 9, 9, 7, 7, 1, 1, 1, 1] [2022-11-03 02:07:36,341 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_81634ae4-27af-40ae-86b0-f7d8326dcf83/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Forceful destruction successful, exit code 0 [2022-11-03 02:07:36,525 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 13 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_81634ae4-27af-40ae-86b0-f7d8326dcf83/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable15 [2022-11-03 02:07:36,525 INFO L420 AbstractCegarLoop]: === Iteration 17 === Targeting ULTIMATE.startErr3REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 2 more)] === [2022-11-03 02:07:36,525 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-03 02:07:36,526 INFO L85 PathProgramCache]: Analyzing trace with hash 1173973892, now seen corresponding path program 11 times [2022-11-03 02:07:36,526 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-03 02:07:36,526 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [988327149] [2022-11-03 02:07:36,526 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-03 02:07:36,526 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-03 02:07:36,577 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-03 02:07:37,224 INFO L134 CoverageAnalysis]: Checked inductivity of 211 backedges. 70 proven. 133 refuted. 0 times theorem prover too weak. 8 trivial. 0 not checked. [2022-11-03 02:07:37,224 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-03 02:07:37,224 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [988327149] [2022-11-03 02:07:37,224 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [988327149] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-03 02:07:37,224 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [719748398] [2022-11-03 02:07:37,225 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-11-03 02:07:37,225 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-03 02:07:37,225 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_81634ae4-27af-40ae-86b0-f7d8326dcf83/bin/utaipan-7li7fVZpFI/z3 [2022-11-03 02:07:37,229 INFO L229 MonitoredProcess]: Starting monitored process 14 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_81634ae4-27af-40ae-86b0-f7d8326dcf83/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-03 02:07:37,260 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_81634ae4-27af-40ae-86b0-f7d8326dcf83/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (14)] Waiting until timeout for monitored process [2022-11-03 02:07:37,799 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 10 check-sat command(s) [2022-11-03 02:07:37,799 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-03 02:07:37,803 INFO L263 TraceCheckSpWp]: Trace formula consists of 338 conjuncts, 89 conjunts are in the unsatisfiable core [2022-11-03 02:07:37,806 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-03 02:07:37,817 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2022-11-03 02:07:38,915 INFO L134 CoverageAnalysis]: Checked inductivity of 211 backedges. 154 proven. 57 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-03 02:07:38,915 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-03 02:07:40,066 INFO L134 CoverageAnalysis]: Checked inductivity of 211 backedges. 154 proven. 57 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-03 02:07:40,066 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [719748398] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-03 02:07:40,066 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [648209658] [2022-11-03 02:07:40,068 INFO L159 IcfgInterpreter]: Started Sifa with 9 locations of interest [2022-11-03 02:07:40,068 INFO L166 IcfgInterpreter]: Building call graph [2022-11-03 02:07:40,069 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-03 02:07:40,069 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-03 02:07:40,069 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-03 02:07:40,097 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 8 treesize of output 7 [2022-11-03 02:07:40,141 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-11-03 02:07:40,175 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-11-03 02:07:40,551 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-03 02:07:42,937 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '3699#(and (<= |ULTIMATE.start_main_~length~0#1| 2147483647) (<= |ULTIMATE.start_main_~n~0#1| 2147483647) (<= |ULTIMATE.start_cmemchr_#in~s#1.offset| 0) (= |ULTIMATE.start_main_#t~malloc8#1.offset| 0) (<= |ULTIMATE.start_cmemchr_~s#1.offset| 0) (<= 0 |ULTIMATE.start_main_~nondetArea~0#1.offset|) (<= 1 |ULTIMATE.start_main_~i~0#1|) (<= 0 |ULTIMATE.start_cmemchr_#t~post3#1.offset|) (<= 0 |ULTIMATE.start_main_~nondetArea~0#1.base|) (< (select |#length| |ULTIMATE.start_cmemchr_#t~post3#1.base|) (+ |ULTIMATE.start_cmemchr_#t~post3#1.offset| 1)) (<= 0 |ULTIMATE.start_cmemchr_#t~post3#1.base|) (<= 1 |ULTIMATE.start_cmemchr_~p~0#1.offset|) (<= |ULTIMATE.start_cmemchr_~n#1| 2147483647) (<= 0 |ULTIMATE.start_cmemchr_~s#1.base|) (<= |ULTIMATE.start_main_~c~0#1| 2147483647) (<= 0 |ULTIMATE.start_main_#t~malloc8#1.base|) (<= 0 (+ |ULTIMATE.start_cmemchr_#in~c#1| 2147483648)) (<= 0 |ULTIMATE.start_cmemchr_~s#1.offset|) (<= 1 |ULTIMATE.start_main_~n~0#1|) (<= 1 |ULTIMATE.start_main_~length~0#1|) (<= |ULTIMATE.start_cmemchr_#in~c#1| 2147483647) (= |#NULL.offset| 0) (<= 0 |ULTIMATE.start_cmemchr_~p~0#1.base|) (<= |ULTIMATE.start_cmemchr_#in~n#1| 2147483647) (<= 0 (+ |ULTIMATE.start_main_~c~0#1| 2147483648)) (<= 0 (+ |ULTIMATE.start_cmemchr_~c#1| 2147483648)) (<= 0 |ULTIMATE.start_cmemchr_#in~s#1.base|) (<= |ULTIMATE.start_main_~nondetArea~0#1.offset| 0) (<= 0 |#StackHeapBarrier|) (<= 0 |ULTIMATE.start_cmemchr_#in~s#1.offset|) (<= 1 |ULTIMATE.start_cmemchr_#in~n#1|) (<= |ULTIMATE.start_cmemchr_~c#1| 2147483647) (= |#NULL.base| 0))' at error location [2022-11-03 02:07:42,937 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-03 02:07:42,937 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-03 02:07:42,937 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [18, 21, 21] total 58 [2022-11-03 02:07:42,937 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [69256681] [2022-11-03 02:07:42,938 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-03 02:07:42,938 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 59 states [2022-11-03 02:07:42,938 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-03 02:07:42,939 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 59 interpolants. [2022-11-03 02:07:42,941 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=356, Invalid=4066, Unknown=0, NotChecked=0, Total=4422 [2022-11-03 02:07:42,941 INFO L87 Difference]: Start difference. First operand 56 states and 57 transitions. Second operand has 59 states, 59 states have (on average 2.5762711864406778) internal successors, (152), 58 states have internal predecessors, (152), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 02:07:45,971 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-03 02:07:45,971 INFO L93 Difference]: Finished difference Result 124 states and 125 transitions. [2022-11-03 02:07:45,972 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 40 states. [2022-11-03 02:07:45,972 INFO L78 Accepts]: Start accepts. Automaton has has 59 states, 59 states have (on average 2.5762711864406778) internal successors, (152), 58 states have internal predecessors, (152), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 55 [2022-11-03 02:07:45,972 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-03 02:07:45,973 INFO L225 Difference]: With dead ends: 124 [2022-11-03 02:07:45,973 INFO L226 Difference]: Without dead ends: 60 [2022-11-03 02:07:45,977 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 210 GetRequests, 116 SyntacticMatches, 0 SemanticMatches, 94 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1941 ImplicationChecksByTransitivity, 6.5s TimeCoverageRelationStatistics Valid=1153, Invalid=7967, Unknown=0, NotChecked=0, Total=9120 [2022-11-03 02:07:45,978 INFO L413 NwaCegarLoop]: 7 mSDtfsCounter, 121 mSDsluCounter, 283 mSDsCounter, 0 mSdLazyCounter, 1282 mSolverCounterSat, 94 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.7s Time, 0 mProtectedPredicate, 0 mProtectedAction, 121 SdHoareTripleChecker+Valid, 224 SdHoareTripleChecker+Invalid, 1376 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 94 IncrementalHoareTripleChecker+Valid, 1282 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.9s IncrementalHoareTripleChecker+Time [2022-11-03 02:07:45,978 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [121 Valid, 224 Invalid, 1376 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [94 Valid, 1282 Invalid, 0 Unknown, 0 Unchecked, 0.9s Time] [2022-11-03 02:07:45,979 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 60 states. [2022-11-03 02:07:45,982 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 60 to 60. [2022-11-03 02:07:45,982 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 60 states, 59 states have (on average 1.0338983050847457) internal successors, (61), 59 states have internal predecessors, (61), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 02:07:45,983 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 60 states to 60 states and 61 transitions. [2022-11-03 02:07:45,983 INFO L78 Accepts]: Start accepts. Automaton has 60 states and 61 transitions. Word has length 55 [2022-11-03 02:07:45,983 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-03 02:07:45,984 INFO L495 AbstractCegarLoop]: Abstraction has 60 states and 61 transitions. [2022-11-03 02:07:45,984 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 59 states, 59 states have (on average 2.5762711864406778) internal successors, (152), 58 states have internal predecessors, (152), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 02:07:45,984 INFO L276 IsEmpty]: Start isEmpty. Operand 60 states and 61 transitions. [2022-11-03 02:07:45,985 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 60 [2022-11-03 02:07:45,985 INFO L187 NwaCegarLoop]: Found error trace [2022-11-03 02:07:45,985 INFO L195 NwaCegarLoop]: trace histogram [10, 9, 9, 9, 9, 9, 1, 1, 1, 1] [2022-11-03 02:07:45,993 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_81634ae4-27af-40ae-86b0-f7d8326dcf83/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (14)] Ended with exit code 0 [2022-11-03 02:07:46,192 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 14 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_81634ae4-27af-40ae-86b0-f7d8326dcf83/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable16 [2022-11-03 02:07:46,192 INFO L420 AbstractCegarLoop]: === Iteration 18 === Targeting ULTIMATE.startErr3REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 2 more)] === [2022-11-03 02:07:46,193 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-03 02:07:46,193 INFO L85 PathProgramCache]: Analyzing trace with hash -235632670, now seen corresponding path program 12 times [2022-11-03 02:07:46,193 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-03 02:07:46,193 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1195814193] [2022-11-03 02:07:46,193 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-03 02:07:46,193 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-03 02:07:46,248 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-03 02:07:47,103 INFO L134 CoverageAnalysis]: Checked inductivity of 243 backedges. 18 proven. 225 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-03 02:07:47,104 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-03 02:07:47,104 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1195814193] [2022-11-03 02:07:47,104 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1195814193] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-03 02:07:47,104 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [223118568] [2022-11-03 02:07:47,104 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-11-03 02:07:47,105 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-03 02:07:47,105 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_81634ae4-27af-40ae-86b0-f7d8326dcf83/bin/utaipan-7li7fVZpFI/z3 [2022-11-03 02:07:47,106 INFO L229 MonitoredProcess]: Starting monitored process 15 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_81634ae4-27af-40ae-86b0-f7d8326dcf83/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-03 02:07:47,114 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_81634ae4-27af-40ae-86b0-f7d8326dcf83/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (15)] Waiting until timeout for monitored process [2022-11-03 02:07:47,326 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-11-03 02:07:47,326 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-03 02:07:47,330 INFO L263 TraceCheckSpWp]: Trace formula consists of 364 conjuncts, 44 conjunts are in the unsatisfiable core [2022-11-03 02:07:47,332 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-03 02:07:47,651 INFO L134 CoverageAnalysis]: Checked inductivity of 243 backedges. 18 proven. 225 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-03 02:07:47,651 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-03 02:07:48,784 INFO L134 CoverageAnalysis]: Checked inductivity of 243 backedges. 18 proven. 225 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-03 02:07:48,784 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [223118568] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-03 02:07:48,784 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1700428328] [2022-11-03 02:07:48,786 INFO L159 IcfgInterpreter]: Started Sifa with 9 locations of interest [2022-11-03 02:07:48,786 INFO L166 IcfgInterpreter]: Building call graph [2022-11-03 02:07:48,787 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-03 02:07:48,787 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-03 02:07:48,787 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-03 02:07:48,813 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 8 treesize of output 7 [2022-11-03 02:07:48,847 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2022-11-03 02:07:48,881 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-11-03 02:07:49,306 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-03 02:07:51,671 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '4343#(and (<= |ULTIMATE.start_main_~length~0#1| 2147483647) (<= |ULTIMATE.start_main_~n~0#1| 2147483647) (<= |ULTIMATE.start_cmemchr_#in~s#1.offset| 0) (= |ULTIMATE.start_main_#t~malloc8#1.offset| 0) (<= |ULTIMATE.start_cmemchr_~s#1.offset| 0) (<= 0 |ULTIMATE.start_main_~nondetArea~0#1.offset|) (<= 1 |ULTIMATE.start_main_~i~0#1|) (<= 0 |ULTIMATE.start_cmemchr_#t~post3#1.offset|) (<= 0 |ULTIMATE.start_main_~nondetArea~0#1.base|) (< (select |#length| |ULTIMATE.start_cmemchr_#t~post3#1.base|) (+ |ULTIMATE.start_cmemchr_#t~post3#1.offset| 1)) (<= 0 |ULTIMATE.start_cmemchr_#t~post3#1.base|) (<= 1 |ULTIMATE.start_cmemchr_~p~0#1.offset|) (<= |ULTIMATE.start_cmemchr_~n#1| 2147483647) (<= 0 |ULTIMATE.start_cmemchr_~s#1.base|) (<= |ULTIMATE.start_main_~c~0#1| 2147483647) (<= 0 |ULTIMATE.start_main_#t~malloc8#1.base|) (<= 0 (+ |ULTIMATE.start_cmemchr_#in~c#1| 2147483648)) (<= 0 |ULTIMATE.start_cmemchr_~s#1.offset|) (<= 1 |ULTIMATE.start_main_~n~0#1|) (<= 1 |ULTIMATE.start_main_~length~0#1|) (<= |ULTIMATE.start_cmemchr_#in~c#1| 2147483647) (= |#NULL.offset| 0) (<= 0 |ULTIMATE.start_cmemchr_~p~0#1.base|) (<= |ULTIMATE.start_cmemchr_#in~n#1| 2147483647) (<= 0 (+ |ULTIMATE.start_main_~c~0#1| 2147483648)) (<= 0 (+ |ULTIMATE.start_cmemchr_~c#1| 2147483648)) (<= 0 |ULTIMATE.start_cmemchr_#in~s#1.base|) (<= |ULTIMATE.start_main_~nondetArea~0#1.offset| 0) (<= 0 |#StackHeapBarrier|) (<= 0 |ULTIMATE.start_cmemchr_#in~s#1.offset|) (<= 1 |ULTIMATE.start_cmemchr_#in~n#1|) (<= |ULTIMATE.start_cmemchr_~c#1| 2147483647) (= |#NULL.base| 0))' at error location [2022-11-03 02:07:51,671 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-03 02:07:51,671 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-03 02:07:51,671 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [22, 22, 22] total 45 [2022-11-03 02:07:51,671 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1328930687] [2022-11-03 02:07:51,671 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-03 02:07:51,672 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 46 states [2022-11-03 02:07:51,672 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-03 02:07:51,673 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 46 interpolants. [2022-11-03 02:07:51,674 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=147, Invalid=2715, Unknown=0, NotChecked=0, Total=2862 [2022-11-03 02:07:51,674 INFO L87 Difference]: Start difference. First operand 60 states and 61 transitions. Second operand has 46 states, 46 states have (on average 2.608695652173913) internal successors, (120), 45 states have internal predecessors, (120), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 02:07:53,283 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-03 02:07:53,283 INFO L93 Difference]: Finished difference Result 100 states and 101 transitions. [2022-11-03 02:07:53,283 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 31 states. [2022-11-03 02:07:53,283 INFO L78 Accepts]: Start accepts. Automaton has has 46 states, 46 states have (on average 2.608695652173913) internal successors, (120), 45 states have internal predecessors, (120), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 59 [2022-11-03 02:07:53,284 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-03 02:07:53,284 INFO L225 Difference]: With dead ends: 100 [2022-11-03 02:07:53,284 INFO L226 Difference]: Without dead ends: 63 [2022-11-03 02:07:53,285 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 215 GetRequests, 144 SyntacticMatches, 1 SemanticMatches, 70 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 806 ImplicationChecksByTransitivity, 4.7s TimeCoverageRelationStatistics Valid=258, Invalid=4854, Unknown=0, NotChecked=0, Total=5112 [2022-11-03 02:07:53,286 INFO L413 NwaCegarLoop]: 27 mSDtfsCounter, 88 mSDsluCounter, 805 mSDsCounter, 0 mSdLazyCounter, 996 mSolverCounterSat, 39 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 88 SdHoareTripleChecker+Valid, 815 SdHoareTripleChecker+Invalid, 1035 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 39 IncrementalHoareTripleChecker+Valid, 996 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.7s IncrementalHoareTripleChecker+Time [2022-11-03 02:07:53,287 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [88 Valid, 815 Invalid, 1035 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [39 Valid, 996 Invalid, 0 Unknown, 0 Unchecked, 0.7s Time] [2022-11-03 02:07:53,287 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 63 states. [2022-11-03 02:07:53,290 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 63 to 62. [2022-11-03 02:07:53,290 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 62 states, 61 states have (on average 1.0327868852459017) internal successors, (63), 61 states have internal predecessors, (63), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 02:07:53,291 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 62 states to 62 states and 63 transitions. [2022-11-03 02:07:53,291 INFO L78 Accepts]: Start accepts. Automaton has 62 states and 63 transitions. Word has length 59 [2022-11-03 02:07:53,292 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-03 02:07:53,292 INFO L495 AbstractCegarLoop]: Abstraction has 62 states and 63 transitions. [2022-11-03 02:07:53,292 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 46 states, 46 states have (on average 2.608695652173913) internal successors, (120), 45 states have internal predecessors, (120), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 02:07:53,292 INFO L276 IsEmpty]: Start isEmpty. Operand 62 states and 63 transitions. [2022-11-03 02:07:53,293 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 62 [2022-11-03 02:07:53,293 INFO L187 NwaCegarLoop]: Found error trace [2022-11-03 02:07:53,294 INFO L195 NwaCegarLoop]: trace histogram [10, 10, 10, 9, 9, 9, 1, 1, 1, 1] [2022-11-03 02:07:53,331 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_81634ae4-27af-40ae-86b0-f7d8326dcf83/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (15)] Forceful destruction successful, exit code 0 [2022-11-03 02:07:53,517 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 15 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_81634ae4-27af-40ae-86b0-f7d8326dcf83/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable17 [2022-11-03 02:07:53,517 INFO L420 AbstractCegarLoop]: === Iteration 19 === Targeting ULTIMATE.startErr3REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 2 more)] === [2022-11-03 02:07:53,517 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-03 02:07:53,517 INFO L85 PathProgramCache]: Analyzing trace with hash -1473340815, now seen corresponding path program 13 times [2022-11-03 02:07:53,517 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-03 02:07:53,518 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [156786234] [2022-11-03 02:07:53,518 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-03 02:07:53,518 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-03 02:07:53,577 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-03 02:07:54,990 INFO L134 CoverageAnalysis]: Checked inductivity of 262 backedges. 72 proven. 190 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-03 02:07:54,990 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-03 02:07:54,990 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [156786234] [2022-11-03 02:07:54,990 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [156786234] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-03 02:07:54,991 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1406624177] [2022-11-03 02:07:54,991 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-11-03 02:07:54,991 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-03 02:07:54,991 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_81634ae4-27af-40ae-86b0-f7d8326dcf83/bin/utaipan-7li7fVZpFI/z3 [2022-11-03 02:07:54,993 INFO L229 MonitoredProcess]: Starting monitored process 16 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_81634ae4-27af-40ae-86b0-f7d8326dcf83/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-03 02:07:55,020 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_81634ae4-27af-40ae-86b0-f7d8326dcf83/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (16)] Waiting until timeout for monitored process [2022-11-03 02:07:55,156 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-03 02:07:55,160 INFO L263 TraceCheckSpWp]: Trace formula consists of 377 conjuncts, 99 conjunts are in the unsatisfiable core [2022-11-03 02:07:55,163 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-03 02:07:55,489 INFO L134 CoverageAnalysis]: Checked inductivity of 262 backedges. 90 proven. 172 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-03 02:07:55,489 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-03 02:07:56,279 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 7 treesize of output 5 [2022-11-03 02:07:56,410 INFO L134 CoverageAnalysis]: Checked inductivity of 262 backedges. 90 proven. 172 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-03 02:07:56,410 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1406624177] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-03 02:07:56,410 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [895990909] [2022-11-03 02:07:56,412 INFO L159 IcfgInterpreter]: Started Sifa with 9 locations of interest [2022-11-03 02:07:56,413 INFO L166 IcfgInterpreter]: Building call graph [2022-11-03 02:07:56,413 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-03 02:07:56,413 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-03 02:07:56,413 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-03 02:07:56,442 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 8 treesize of output 7 [2022-11-03 02:07:56,467 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2022-11-03 02:07:56,505 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-11-03 02:07:56,965 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-03 02:07:59,326 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '4951#(and (<= |ULTIMATE.start_main_~length~0#1| 2147483647) (<= |ULTIMATE.start_main_~n~0#1| 2147483647) (<= |ULTIMATE.start_cmemchr_#in~s#1.offset| 0) (= |ULTIMATE.start_main_#t~malloc8#1.offset| 0) (<= |ULTIMATE.start_cmemchr_~s#1.offset| 0) (<= 0 |ULTIMATE.start_main_~nondetArea~0#1.offset|) (<= 1 |ULTIMATE.start_main_~i~0#1|) (<= 0 |ULTIMATE.start_cmemchr_#t~post3#1.offset|) (<= 0 |ULTIMATE.start_main_~nondetArea~0#1.base|) (< (select |#length| |ULTIMATE.start_cmemchr_#t~post3#1.base|) (+ |ULTIMATE.start_cmemchr_#t~post3#1.offset| 1)) (<= 0 |ULTIMATE.start_cmemchr_#t~post3#1.base|) (<= 1 |ULTIMATE.start_cmemchr_~p~0#1.offset|) (<= |ULTIMATE.start_cmemchr_~n#1| 2147483647) (<= 0 |ULTIMATE.start_cmemchr_~s#1.base|) (<= |ULTIMATE.start_main_~c~0#1| 2147483647) (<= 0 |ULTIMATE.start_main_#t~malloc8#1.base|) (<= 0 (+ |ULTIMATE.start_cmemchr_#in~c#1| 2147483648)) (<= 0 |ULTIMATE.start_cmemchr_~s#1.offset|) (<= 1 |ULTIMATE.start_main_~n~0#1|) (<= 1 |ULTIMATE.start_main_~length~0#1|) (<= |ULTIMATE.start_cmemchr_#in~c#1| 2147483647) (= |#NULL.offset| 0) (<= 0 |ULTIMATE.start_cmemchr_~p~0#1.base|) (<= |ULTIMATE.start_cmemchr_#in~n#1| 2147483647) (<= 0 (+ |ULTIMATE.start_main_~c~0#1| 2147483648)) (<= 0 (+ |ULTIMATE.start_cmemchr_~c#1| 2147483648)) (<= 0 |ULTIMATE.start_cmemchr_#in~s#1.base|) (<= |ULTIMATE.start_main_~nondetArea~0#1.offset| 0) (<= 0 |#StackHeapBarrier|) (<= 0 |ULTIMATE.start_cmemchr_#in~s#1.offset|) (<= 1 |ULTIMATE.start_cmemchr_#in~n#1|) (<= |ULTIMATE.start_cmemchr_~c#1| 2147483647) (= |#NULL.base| 0))' at error location [2022-11-03 02:07:59,327 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-03 02:07:59,327 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-03 02:07:59,327 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [24, 24, 24] total 40 [2022-11-03 02:07:59,328 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [522725776] [2022-11-03 02:07:59,328 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-03 02:07:59,328 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 42 states [2022-11-03 02:07:59,329 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-03 02:07:59,329 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 42 interpolants. [2022-11-03 02:07:59,330 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=221, Invalid=2229, Unknown=0, NotChecked=0, Total=2450 [2022-11-03 02:07:59,330 INFO L87 Difference]: Start difference. First operand 62 states and 63 transitions. Second operand has 42 states, 41 states have (on average 2.6097560975609757) internal successors, (107), 41 states have internal predecessors, (107), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 02:08:00,926 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-03 02:08:00,926 INFO L93 Difference]: Finished difference Result 68 states and 69 transitions. [2022-11-03 02:08:00,927 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 36 states. [2022-11-03 02:08:00,927 INFO L78 Accepts]: Start accepts. Automaton has has 42 states, 41 states have (on average 2.6097560975609757) internal successors, (107), 41 states have internal predecessors, (107), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 61 [2022-11-03 02:08:00,927 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-03 02:08:00,928 INFO L225 Difference]: With dead ends: 68 [2022-11-03 02:08:00,928 INFO L226 Difference]: Without dead ends: 68 [2022-11-03 02:08:00,929 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 229 GetRequests, 147 SyntacticMatches, 10 SemanticMatches, 72 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1051 ImplicationChecksByTransitivity, 4.4s TimeCoverageRelationStatistics Valid=797, Invalid=4605, Unknown=0, NotChecked=0, Total=5402 [2022-11-03 02:08:00,930 INFO L413 NwaCegarLoop]: 9 mSDtfsCounter, 229 mSDsluCounter, 272 mSDsCounter, 0 mSdLazyCounter, 1041 mSolverCounterSat, 73 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 229 SdHoareTripleChecker+Valid, 157 SdHoareTripleChecker+Invalid, 1114 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 73 IncrementalHoareTripleChecker+Valid, 1041 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.7s IncrementalHoareTripleChecker+Time [2022-11-03 02:08:00,930 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [229 Valid, 157 Invalid, 1114 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [73 Valid, 1041 Invalid, 0 Unknown, 0 Unchecked, 0.7s Time] [2022-11-03 02:08:00,931 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 68 states. [2022-11-03 02:08:00,933 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 68 to 66. [2022-11-03 02:08:00,934 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 66 states, 65 states have (on average 1.0307692307692307) internal successors, (67), 65 states have internal predecessors, (67), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 02:08:00,940 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 66 states to 66 states and 67 transitions. [2022-11-03 02:08:00,941 INFO L78 Accepts]: Start accepts. Automaton has 66 states and 67 transitions. Word has length 61 [2022-11-03 02:08:00,941 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-03 02:08:00,942 INFO L495 AbstractCegarLoop]: Abstraction has 66 states and 67 transitions. [2022-11-03 02:08:00,943 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 42 states, 41 states have (on average 2.6097560975609757) internal successors, (107), 41 states have internal predecessors, (107), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 02:08:00,943 INFO L276 IsEmpty]: Start isEmpty. Operand 66 states and 67 transitions. [2022-11-03 02:08:00,944 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 66 [2022-11-03 02:08:00,950 INFO L187 NwaCegarLoop]: Found error trace [2022-11-03 02:08:00,950 INFO L195 NwaCegarLoop]: trace histogram [11, 10, 10, 10, 10, 10, 1, 1, 1, 1] [2022-11-03 02:08:00,979 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_81634ae4-27af-40ae-86b0-f7d8326dcf83/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (16)] Forceful destruction successful, exit code 0 [2022-11-03 02:08:01,153 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable18,16 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_81634ae4-27af-40ae-86b0-f7d8326dcf83/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-03 02:08:01,153 INFO L420 AbstractCegarLoop]: === Iteration 20 === Targeting ULTIMATE.startErr3REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 2 more)] === [2022-11-03 02:08:01,153 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-03 02:08:01,154 INFO L85 PathProgramCache]: Analyzing trace with hash 1636784417, now seen corresponding path program 14 times [2022-11-03 02:08:01,154 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-03 02:08:01,154 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1917409504] [2022-11-03 02:08:01,154 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-03 02:08:01,154 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-03 02:08:01,213 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-03 02:08:02,162 INFO L134 CoverageAnalysis]: Checked inductivity of 300 backedges. 20 proven. 280 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-03 02:08:02,163 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-03 02:08:02,163 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1917409504] [2022-11-03 02:08:02,163 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1917409504] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-03 02:08:02,163 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [877656227] [2022-11-03 02:08:02,163 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-11-03 02:08:02,163 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-03 02:08:02,164 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_81634ae4-27af-40ae-86b0-f7d8326dcf83/bin/utaipan-7li7fVZpFI/z3 [2022-11-03 02:08:02,165 INFO L229 MonitoredProcess]: Starting monitored process 17 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_81634ae4-27af-40ae-86b0-f7d8326dcf83/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-03 02:08:02,202 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_81634ae4-27af-40ae-86b0-f7d8326dcf83/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (17)] Waiting until timeout for monitored process [2022-11-03 02:08:02,932 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 11 check-sat command(s) [2022-11-03 02:08:02,933 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-03 02:08:02,937 INFO L263 TraceCheckSpWp]: Trace formula consists of 397 conjuncts, 48 conjunts are in the unsatisfiable core [2022-11-03 02:08:02,939 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-03 02:08:03,225 INFO L134 CoverageAnalysis]: Checked inductivity of 300 backedges. 20 proven. 280 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-03 02:08:03,225 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-03 02:08:04,478 INFO L134 CoverageAnalysis]: Checked inductivity of 300 backedges. 20 proven. 280 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-03 02:08:04,478 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [877656227] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-03 02:08:04,479 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [110492439] [2022-11-03 02:08:04,480 INFO L159 IcfgInterpreter]: Started Sifa with 9 locations of interest [2022-11-03 02:08:04,481 INFO L166 IcfgInterpreter]: Building call graph [2022-11-03 02:08:04,481 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-03 02:08:04,481 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-03 02:08:04,482 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-03 02:08:04,514 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 8 treesize of output 7 [2022-11-03 02:08:04,543 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2022-11-03 02:08:04,578 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-11-03 02:08:05,052 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-03 02:08:07,562 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '5575#(and (<= |ULTIMATE.start_main_~length~0#1| 2147483647) (<= |ULTIMATE.start_main_~n~0#1| 2147483647) (<= |ULTIMATE.start_cmemchr_#in~s#1.offset| 0) (= |ULTIMATE.start_main_#t~malloc8#1.offset| 0) (<= |ULTIMATE.start_cmemchr_~s#1.offset| 0) (<= 0 |ULTIMATE.start_main_~nondetArea~0#1.offset|) (<= 1 |ULTIMATE.start_main_~i~0#1|) (<= 0 |ULTIMATE.start_cmemchr_#t~post3#1.offset|) (<= 0 |ULTIMATE.start_main_~nondetArea~0#1.base|) (< (select |#length| |ULTIMATE.start_cmemchr_#t~post3#1.base|) (+ |ULTIMATE.start_cmemchr_#t~post3#1.offset| 1)) (<= 0 |ULTIMATE.start_cmemchr_#t~post3#1.base|) (<= 1 |ULTIMATE.start_cmemchr_~p~0#1.offset|) (<= |ULTIMATE.start_cmemchr_~n#1| 2147483647) (<= 0 |ULTIMATE.start_cmemchr_~s#1.base|) (<= |ULTIMATE.start_main_~c~0#1| 2147483647) (<= 0 |ULTIMATE.start_main_#t~malloc8#1.base|) (<= 0 (+ |ULTIMATE.start_cmemchr_#in~c#1| 2147483648)) (<= 0 |ULTIMATE.start_cmemchr_~s#1.offset|) (<= 1 |ULTIMATE.start_main_~n~0#1|) (<= 1 |ULTIMATE.start_main_~length~0#1|) (<= |ULTIMATE.start_cmemchr_#in~c#1| 2147483647) (= |#NULL.offset| 0) (<= 0 |ULTIMATE.start_cmemchr_~p~0#1.base|) (<= |ULTIMATE.start_cmemchr_#in~n#1| 2147483647) (<= 0 (+ |ULTIMATE.start_main_~c~0#1| 2147483648)) (<= 0 (+ |ULTIMATE.start_cmemchr_~c#1| 2147483648)) (<= 0 |ULTIMATE.start_cmemchr_#in~s#1.base|) (<= |ULTIMATE.start_main_~nondetArea~0#1.offset| 0) (<= 0 |#StackHeapBarrier|) (<= 0 |ULTIMATE.start_cmemchr_#in~s#1.offset|) (<= 1 |ULTIMATE.start_cmemchr_#in~n#1|) (<= |ULTIMATE.start_cmemchr_~c#1| 2147483647) (= |#NULL.base| 0))' at error location [2022-11-03 02:08:07,562 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-03 02:08:07,563 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-03 02:08:07,563 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [24, 24, 24] total 49 [2022-11-03 02:08:07,563 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1273934244] [2022-11-03 02:08:07,563 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-03 02:08:07,564 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 50 states [2022-11-03 02:08:07,564 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-03 02:08:07,565 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 50 interpolants. [2022-11-03 02:08:07,565 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=157, Invalid=3149, Unknown=0, NotChecked=0, Total=3306 [2022-11-03 02:08:07,566 INFO L87 Difference]: Start difference. First operand 66 states and 67 transitions. Second operand has 50 states, 50 states have (on average 2.64) internal successors, (132), 49 states have internal predecessors, (132), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 02:08:09,343 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-03 02:08:09,343 INFO L93 Difference]: Finished difference Result 110 states and 111 transitions. [2022-11-03 02:08:09,343 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 34 states. [2022-11-03 02:08:09,344 INFO L78 Accepts]: Start accepts. Automaton has has 50 states, 50 states have (on average 2.64) internal successors, (132), 49 states have internal predecessors, (132), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 65 [2022-11-03 02:08:09,344 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-03 02:08:09,345 INFO L225 Difference]: With dead ends: 110 [2022-11-03 02:08:09,345 INFO L226 Difference]: Without dead ends: 69 [2022-11-03 02:08:09,346 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 237 GetRequests, 160 SyntacticMatches, 1 SemanticMatches, 76 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 926 ImplicationChecksByTransitivity, 5.1s TimeCoverageRelationStatistics Valid=280, Invalid=5726, Unknown=0, NotChecked=0, Total=6006 [2022-11-03 02:08:09,346 INFO L413 NwaCegarLoop]: 30 mSDtfsCounter, 97 mSDsluCounter, 757 mSDsCounter, 0 mSdLazyCounter, 916 mSolverCounterSat, 43 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 97 SdHoareTripleChecker+Valid, 773 SdHoareTripleChecker+Invalid, 959 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 43 IncrementalHoareTripleChecker+Valid, 916 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.7s IncrementalHoareTripleChecker+Time [2022-11-03 02:08:09,347 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [97 Valid, 773 Invalid, 959 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [43 Valid, 916 Invalid, 0 Unknown, 0 Unchecked, 0.7s Time] [2022-11-03 02:08:09,347 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 69 states. [2022-11-03 02:08:09,361 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 69 to 68. [2022-11-03 02:08:09,371 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 68 states, 67 states have (on average 1.0298507462686568) internal successors, (69), 67 states have internal predecessors, (69), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 02:08:09,371 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 68 states to 68 states and 69 transitions. [2022-11-03 02:08:09,372 INFO L78 Accepts]: Start accepts. Automaton has 68 states and 69 transitions. Word has length 65 [2022-11-03 02:08:09,372 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-03 02:08:09,372 INFO L495 AbstractCegarLoop]: Abstraction has 68 states and 69 transitions. [2022-11-03 02:08:09,372 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 50 states, 50 states have (on average 2.64) internal successors, (132), 49 states have internal predecessors, (132), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 02:08:09,372 INFO L276 IsEmpty]: Start isEmpty. Operand 68 states and 69 transitions. [2022-11-03 02:08:09,373 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 68 [2022-11-03 02:08:09,373 INFO L187 NwaCegarLoop]: Found error trace [2022-11-03 02:08:09,373 INFO L195 NwaCegarLoop]: trace histogram [11, 11, 11, 10, 10, 10, 1, 1, 1, 1] [2022-11-03 02:08:09,407 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_81634ae4-27af-40ae-86b0-f7d8326dcf83/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (17)] Forceful destruction successful, exit code 0 [2022-11-03 02:08:09,573 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable19,17 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_81634ae4-27af-40ae-86b0-f7d8326dcf83/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-03 02:08:09,574 INFO L420 AbstractCegarLoop]: === Iteration 21 === Targeting ULTIMATE.startErr3REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 2 more)] === [2022-11-03 02:08:09,574 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-03 02:08:09,574 INFO L85 PathProgramCache]: Analyzing trace with hash -1055980432, now seen corresponding path program 15 times [2022-11-03 02:08:09,574 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-03 02:08:09,574 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1129875574] [2022-11-03 02:08:09,574 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-03 02:08:09,575 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-03 02:08:09,626 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-03 02:08:11,062 INFO L134 CoverageAnalysis]: Checked inductivity of 321 backedges. 90 proven. 231 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-03 02:08:11,062 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-03 02:08:11,062 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1129875574] [2022-11-03 02:08:11,062 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1129875574] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-03 02:08:11,063 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [209126675] [2022-11-03 02:08:11,063 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-11-03 02:08:11,063 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-03 02:08:11,063 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_81634ae4-27af-40ae-86b0-f7d8326dcf83/bin/utaipan-7li7fVZpFI/z3 [2022-11-03 02:08:11,065 INFO L229 MonitoredProcess]: Starting monitored process 18 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_81634ae4-27af-40ae-86b0-f7d8326dcf83/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-03 02:08:11,084 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_81634ae4-27af-40ae-86b0-f7d8326dcf83/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (18)] Waiting until timeout for monitored process [2022-11-03 02:08:11,361 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-11-03 02:08:11,361 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-03 02:08:11,366 INFO L263 TraceCheckSpWp]: Trace formula consists of 410 conjuncts, 114 conjunts are in the unsatisfiable core [2022-11-03 02:08:11,369 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-03 02:08:11,375 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2022-11-03 02:08:12,222 INFO L134 CoverageAnalysis]: Checked inductivity of 321 backedges. 110 proven. 211 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-03 02:08:12,223 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-03 02:08:14,023 INFO L134 CoverageAnalysis]: Checked inductivity of 321 backedges. 121 proven. 200 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-03 02:08:14,023 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [209126675] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-03 02:08:14,024 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [964101382] [2022-11-03 02:08:14,025 INFO L159 IcfgInterpreter]: Started Sifa with 9 locations of interest [2022-11-03 02:08:14,025 INFO L166 IcfgInterpreter]: Building call graph [2022-11-03 02:08:14,026 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-03 02:08:14,026 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-03 02:08:14,026 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-03 02:08:14,045 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 8 treesize of output 7 [2022-11-03 02:08:14,083 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2022-11-03 02:08:14,122 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-11-03 02:08:14,524 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-03 02:08:17,148 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '6264#(and (<= |ULTIMATE.start_main_~length~0#1| 2147483647) (<= |ULTIMATE.start_main_~n~0#1| 2147483647) (<= |ULTIMATE.start_cmemchr_#in~s#1.offset| 0) (= |ULTIMATE.start_main_#t~malloc8#1.offset| 0) (<= |ULTIMATE.start_cmemchr_~s#1.offset| 0) (<= 0 |ULTIMATE.start_main_~nondetArea~0#1.offset|) (<= 1 |ULTIMATE.start_main_~i~0#1|) (<= 0 |ULTIMATE.start_cmemchr_#t~post3#1.offset|) (<= 0 |ULTIMATE.start_main_~nondetArea~0#1.base|) (< (select |#length| |ULTIMATE.start_cmemchr_#t~post3#1.base|) (+ |ULTIMATE.start_cmemchr_#t~post3#1.offset| 1)) (<= 0 |ULTIMATE.start_cmemchr_#t~post3#1.base|) (<= 1 |ULTIMATE.start_cmemchr_~p~0#1.offset|) (<= |ULTIMATE.start_cmemchr_~n#1| 2147483647) (<= 0 |ULTIMATE.start_cmemchr_~s#1.base|) (<= |ULTIMATE.start_main_~c~0#1| 2147483647) (<= 0 |ULTIMATE.start_main_#t~malloc8#1.base|) (<= 0 (+ |ULTIMATE.start_cmemchr_#in~c#1| 2147483648)) (<= 0 |ULTIMATE.start_cmemchr_~s#1.offset|) (<= 1 |ULTIMATE.start_main_~n~0#1|) (<= 1 |ULTIMATE.start_main_~length~0#1|) (<= |ULTIMATE.start_cmemchr_#in~c#1| 2147483647) (= |#NULL.offset| 0) (<= 0 |ULTIMATE.start_cmemchr_~p~0#1.base|) (<= |ULTIMATE.start_cmemchr_#in~n#1| 2147483647) (<= 0 (+ |ULTIMATE.start_main_~c~0#1| 2147483648)) (<= 0 (+ |ULTIMATE.start_cmemchr_~c#1| 2147483648)) (<= 0 |ULTIMATE.start_cmemchr_#in~s#1.base|) (<= |ULTIMATE.start_main_~nondetArea~0#1.offset| 0) (<= 0 |#StackHeapBarrier|) (<= 0 |ULTIMATE.start_cmemchr_#in~s#1.offset|) (<= 1 |ULTIMATE.start_cmemchr_#in~n#1|) (<= |ULTIMATE.start_cmemchr_~c#1| 2147483647) (= |#NULL.base| 0))' at error location [2022-11-03 02:08:17,149 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-03 02:08:17,149 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-03 02:08:17,149 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [26, 25, 25] total 65 [2022-11-03 02:08:17,149 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2048702866] [2022-11-03 02:08:17,149 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-03 02:08:17,150 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 67 states [2022-11-03 02:08:17,150 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-03 02:08:17,151 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 67 interpolants. [2022-11-03 02:08:17,151 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=564, Invalid=4986, Unknown=0, NotChecked=0, Total=5550 [2022-11-03 02:08:17,152 INFO L87 Difference]: Start difference. First operand 68 states and 69 transitions. Second operand has 67 states, 66 states have (on average 2.4393939393939394) internal successors, (161), 66 states have internal predecessors, (161), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 02:08:18,981 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-03 02:08:18,981 INFO L93 Difference]: Finished difference Result 74 states and 75 transitions. [2022-11-03 02:08:18,982 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 38 states. [2022-11-03 02:08:18,982 INFO L78 Accepts]: Start accepts. Automaton has has 67 states, 66 states have (on average 2.4393939393939394) internal successors, (161), 66 states have internal predecessors, (161), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 67 [2022-11-03 02:08:18,982 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-03 02:08:18,983 INFO L225 Difference]: With dead ends: 74 [2022-11-03 02:08:18,983 INFO L226 Difference]: Without dead ends: 74 [2022-11-03 02:08:18,985 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 251 GetRequests, 152 SyntacticMatches, 0 SemanticMatches, 99 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2034 ImplicationChecksByTransitivity, 6.1s TimeCoverageRelationStatistics Valid=1791, Invalid=8309, Unknown=0, NotChecked=0, Total=10100 [2022-11-03 02:08:18,985 INFO L413 NwaCegarLoop]: 10 mSDtfsCounter, 364 mSDsluCounter, 262 mSDsCounter, 0 mSdLazyCounter, 1052 mSolverCounterSat, 113 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 364 SdHoareTripleChecker+Valid, 145 SdHoareTripleChecker+Invalid, 1165 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 113 IncrementalHoareTripleChecker+Valid, 1052 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.7s IncrementalHoareTripleChecker+Time [2022-11-03 02:08:18,986 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [364 Valid, 145 Invalid, 1165 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [113 Valid, 1052 Invalid, 0 Unknown, 0 Unchecked, 0.7s Time] [2022-11-03 02:08:18,987 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 74 states. [2022-11-03 02:08:18,988 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 74 to 72. [2022-11-03 02:08:18,989 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 72 states, 71 states have (on average 1.028169014084507) internal successors, (73), 71 states have internal predecessors, (73), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 02:08:18,989 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 72 states to 72 states and 73 transitions. [2022-11-03 02:08:18,990 INFO L78 Accepts]: Start accepts. Automaton has 72 states and 73 transitions. Word has length 67 [2022-11-03 02:08:18,990 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-03 02:08:18,990 INFO L495 AbstractCegarLoop]: Abstraction has 72 states and 73 transitions. [2022-11-03 02:08:18,991 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 67 states, 66 states have (on average 2.4393939393939394) internal successors, (161), 66 states have internal predecessors, (161), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 02:08:18,991 INFO L276 IsEmpty]: Start isEmpty. Operand 72 states and 73 transitions. [2022-11-03 02:08:18,992 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 72 [2022-11-03 02:08:18,992 INFO L187 NwaCegarLoop]: Found error trace [2022-11-03 02:08:18,992 INFO L195 NwaCegarLoop]: trace histogram [12, 11, 11, 11, 11, 11, 1, 1, 1, 1] [2022-11-03 02:08:19,026 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_81634ae4-27af-40ae-86b0-f7d8326dcf83/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (18)] Forceful destruction successful, exit code 0 [2022-11-03 02:08:19,205 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 18 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_81634ae4-27af-40ae-86b0-f7d8326dcf83/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable20 [2022-11-03 02:08:19,206 INFO L420 AbstractCegarLoop]: === Iteration 22 === Targeting ULTIMATE.startErr3REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 2 more)] === [2022-11-03 02:08:19,206 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-03 02:08:19,206 INFO L85 PathProgramCache]: Analyzing trace with hash -534991968, now seen corresponding path program 16 times [2022-11-03 02:08:19,207 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-03 02:08:19,207 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1217350844] [2022-11-03 02:08:19,207 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-03 02:08:19,207 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-03 02:08:19,301 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-03 02:08:20,357 INFO L134 CoverageAnalysis]: Checked inductivity of 363 backedges. 22 proven. 341 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-03 02:08:20,357 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-03 02:08:20,357 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1217350844] [2022-11-03 02:08:20,357 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1217350844] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-03 02:08:20,358 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1209364833] [2022-11-03 02:08:20,358 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-11-03 02:08:20,358 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-03 02:08:20,358 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_81634ae4-27af-40ae-86b0-f7d8326dcf83/bin/utaipan-7li7fVZpFI/z3 [2022-11-03 02:08:20,359 INFO L229 MonitoredProcess]: Starting monitored process 19 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_81634ae4-27af-40ae-86b0-f7d8326dcf83/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-03 02:08:20,361 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_81634ae4-27af-40ae-86b0-f7d8326dcf83/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (19)] Waiting until timeout for monitored process [2022-11-03 02:08:20,628 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-03 02:08:20,632 INFO L263 TraceCheckSpWp]: Trace formula consists of 430 conjuncts, 52 conjunts are in the unsatisfiable core [2022-11-03 02:08:20,634 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-03 02:08:20,961 INFO L134 CoverageAnalysis]: Checked inductivity of 363 backedges. 22 proven. 341 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-03 02:08:20,961 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-03 02:08:22,436 INFO L134 CoverageAnalysis]: Checked inductivity of 363 backedges. 22 proven. 341 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-03 02:08:22,436 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1209364833] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-03 02:08:22,436 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1597124611] [2022-11-03 02:08:22,437 INFO L159 IcfgInterpreter]: Started Sifa with 9 locations of interest [2022-11-03 02:08:22,438 INFO L166 IcfgInterpreter]: Building call graph [2022-11-03 02:08:22,438 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-03 02:08:22,438 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-03 02:08:22,438 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-03 02:08:22,461 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 8 treesize of output 7 [2022-11-03 02:08:22,495 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2022-11-03 02:08:22,534 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-11-03 02:08:22,971 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-03 02:08:25,559 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '6944#(and (<= |ULTIMATE.start_main_~length~0#1| 2147483647) (<= |ULTIMATE.start_main_~n~0#1| 2147483647) (<= |ULTIMATE.start_cmemchr_#in~s#1.offset| 0) (= |ULTIMATE.start_main_#t~malloc8#1.offset| 0) (<= |ULTIMATE.start_cmemchr_~s#1.offset| 0) (<= 0 |ULTIMATE.start_main_~nondetArea~0#1.offset|) (<= 1 |ULTIMATE.start_main_~i~0#1|) (<= 0 |ULTIMATE.start_cmemchr_#t~post3#1.offset|) (<= 0 |ULTIMATE.start_main_~nondetArea~0#1.base|) (< (select |#length| |ULTIMATE.start_cmemchr_#t~post3#1.base|) (+ |ULTIMATE.start_cmemchr_#t~post3#1.offset| 1)) (<= 0 |ULTIMATE.start_cmemchr_#t~post3#1.base|) (<= 1 |ULTIMATE.start_cmemchr_~p~0#1.offset|) (<= |ULTIMATE.start_cmemchr_~n#1| 2147483647) (<= 0 |ULTIMATE.start_cmemchr_~s#1.base|) (<= |ULTIMATE.start_main_~c~0#1| 2147483647) (<= 0 |ULTIMATE.start_main_#t~malloc8#1.base|) (<= 0 (+ |ULTIMATE.start_cmemchr_#in~c#1| 2147483648)) (<= 0 |ULTIMATE.start_cmemchr_~s#1.offset|) (<= 1 |ULTIMATE.start_main_~n~0#1|) (<= 1 |ULTIMATE.start_main_~length~0#1|) (<= |ULTIMATE.start_cmemchr_#in~c#1| 2147483647) (= |#NULL.offset| 0) (<= 0 |ULTIMATE.start_cmemchr_~p~0#1.base|) (<= |ULTIMATE.start_cmemchr_#in~n#1| 2147483647) (<= 0 (+ |ULTIMATE.start_main_~c~0#1| 2147483648)) (<= 0 (+ |ULTIMATE.start_cmemchr_~c#1| 2147483648)) (<= 0 |ULTIMATE.start_cmemchr_#in~s#1.base|) (<= |ULTIMATE.start_main_~nondetArea~0#1.offset| 0) (<= 0 |#StackHeapBarrier|) (<= 0 |ULTIMATE.start_cmemchr_#in~s#1.offset|) (<= 1 |ULTIMATE.start_cmemchr_#in~n#1|) (<= |ULTIMATE.start_cmemchr_~c#1| 2147483647) (= |#NULL.base| 0))' at error location [2022-11-03 02:08:25,559 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-03 02:08:25,560 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-03 02:08:25,560 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [26, 26, 26] total 53 [2022-11-03 02:08:25,560 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [84681219] [2022-11-03 02:08:25,560 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-03 02:08:25,561 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 54 states [2022-11-03 02:08:25,561 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-03 02:08:25,561 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 54 interpolants. [2022-11-03 02:08:25,562 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=167, Invalid=3615, Unknown=0, NotChecked=0, Total=3782 [2022-11-03 02:08:25,562 INFO L87 Difference]: Start difference. First operand 72 states and 73 transitions. Second operand has 54 states, 54 states have (on average 2.6666666666666665) internal successors, (144), 53 states have internal predecessors, (144), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 02:08:27,801 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-03 02:08:27,801 INFO L93 Difference]: Finished difference Result 120 states and 121 transitions. [2022-11-03 02:08:27,801 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 37 states. [2022-11-03 02:08:27,802 INFO L78 Accepts]: Start accepts. Automaton has has 54 states, 54 states have (on average 2.6666666666666665) internal successors, (144), 53 states have internal predecessors, (144), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 71 [2022-11-03 02:08:27,802 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-03 02:08:27,802 INFO L225 Difference]: With dead ends: 120 [2022-11-03 02:08:27,803 INFO L226 Difference]: Without dead ends: 75 [2022-11-03 02:08:27,804 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 259 GetRequests, 176 SyntacticMatches, 1 SemanticMatches, 82 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1054 ImplicationChecksByTransitivity, 5.6s TimeCoverageRelationStatistics Valid=302, Invalid=6670, Unknown=0, NotChecked=0, Total=6972 [2022-11-03 02:08:27,805 INFO L413 NwaCegarLoop]: 33 mSDtfsCounter, 70 mSDsluCounter, 1180 mSDsCounter, 0 mSdLazyCounter, 1437 mSolverCounterSat, 35 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.9s Time, 0 mProtectedPredicate, 0 mProtectedAction, 70 SdHoareTripleChecker+Valid, 1191 SdHoareTripleChecker+Invalid, 1472 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 35 IncrementalHoareTripleChecker+Valid, 1437 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.0s IncrementalHoareTripleChecker+Time [2022-11-03 02:08:27,805 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [70 Valid, 1191 Invalid, 1472 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [35 Valid, 1437 Invalid, 0 Unknown, 0 Unchecked, 1.0s Time] [2022-11-03 02:08:27,806 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 75 states. [2022-11-03 02:08:27,807 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 75 to 74. [2022-11-03 02:08:27,808 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 74 states, 73 states have (on average 1.0273972602739727) internal successors, (75), 73 states have internal predecessors, (75), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 02:08:27,808 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 74 states to 74 states and 75 transitions. [2022-11-03 02:08:27,808 INFO L78 Accepts]: Start accepts. Automaton has 74 states and 75 transitions. Word has length 71 [2022-11-03 02:08:27,808 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-03 02:08:27,808 INFO L495 AbstractCegarLoop]: Abstraction has 74 states and 75 transitions. [2022-11-03 02:08:27,809 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 54 states, 54 states have (on average 2.6666666666666665) internal successors, (144), 53 states have internal predecessors, (144), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 02:08:27,809 INFO L276 IsEmpty]: Start isEmpty. Operand 74 states and 75 transitions. [2022-11-03 02:08:27,810 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 74 [2022-11-03 02:08:27,810 INFO L187 NwaCegarLoop]: Found error trace [2022-11-03 02:08:27,810 INFO L195 NwaCegarLoop]: trace histogram [12, 12, 12, 11, 11, 11, 1, 1, 1, 1] [2022-11-03 02:08:27,846 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_81634ae4-27af-40ae-86b0-f7d8326dcf83/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (19)] Forceful destruction successful, exit code 0 [2022-11-03 02:08:28,010 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 19 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_81634ae4-27af-40ae-86b0-f7d8326dcf83/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable21 [2022-11-03 02:08:28,011 INFO L420 AbstractCegarLoop]: === Iteration 23 === Targeting ULTIMATE.startErr3REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 2 more)] === [2022-11-03 02:08:28,011 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-03 02:08:28,011 INFO L85 PathProgramCache]: Analyzing trace with hash -2130944081, now seen corresponding path program 17 times [2022-11-03 02:08:28,011 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-03 02:08:28,011 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1310168321] [2022-11-03 02:08:28,012 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-03 02:08:28,012 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-03 02:08:28,061 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-03 02:08:29,888 INFO L134 CoverageAnalysis]: Checked inductivity of 386 backedges. 110 proven. 276 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-03 02:08:29,889 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-03 02:08:29,889 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1310168321] [2022-11-03 02:08:29,889 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1310168321] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-03 02:08:29,889 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [678641524] [2022-11-03 02:08:29,889 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-11-03 02:08:29,889 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-03 02:08:29,890 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_81634ae4-27af-40ae-86b0-f7d8326dcf83/bin/utaipan-7li7fVZpFI/z3 [2022-11-03 02:08:29,891 INFO L229 MonitoredProcess]: Starting monitored process 20 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_81634ae4-27af-40ae-86b0-f7d8326dcf83/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-03 02:08:29,892 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_81634ae4-27af-40ae-86b0-f7d8326dcf83/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (20)] Waiting until timeout for monitored process [2022-11-03 02:08:30,745 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 12 check-sat command(s) [2022-11-03 02:08:30,746 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-03 02:08:30,752 INFO L263 TraceCheckSpWp]: Trace formula consists of 430 conjuncts, 149 conjunts are in the unsatisfiable core [2022-11-03 02:08:30,757 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-03 02:08:30,771 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2022-11-03 02:08:34,570 INFO L134 CoverageAnalysis]: Checked inductivity of 386 backedges. 21 proven. 275 refuted. 0 times theorem prover too weak. 90 trivial. 0 not checked. [2022-11-03 02:08:34,570 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-03 02:08:40,791 INFO L134 CoverageAnalysis]: Checked inductivity of 386 backedges. 31 proven. 265 refuted. 0 times theorem prover too weak. 90 trivial. 0 not checked. [2022-11-03 02:08:40,791 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [678641524] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-03 02:08:40,791 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [73975639] [2022-11-03 02:08:40,793 INFO L159 IcfgInterpreter]: Started Sifa with 9 locations of interest [2022-11-03 02:08:40,793 INFO L166 IcfgInterpreter]: Building call graph [2022-11-03 02:08:40,793 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-03 02:08:40,794 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-03 02:08:40,794 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-03 02:08:40,826 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 8 treesize of output 7 [2022-11-03 02:08:40,863 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-11-03 02:08:40,900 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-11-03 02:08:41,336 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-03 02:08:44,911 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '7716#(and (<= |ULTIMATE.start_main_~length~0#1| 2147483647) (<= |ULTIMATE.start_main_~n~0#1| 2147483647) (<= |ULTIMATE.start_cmemchr_#in~s#1.offset| 0) (= |ULTIMATE.start_main_#t~malloc8#1.offset| 0) (<= |ULTIMATE.start_cmemchr_~s#1.offset| 0) (<= 0 |ULTIMATE.start_main_~nondetArea~0#1.offset|) (<= 1 |ULTIMATE.start_main_~i~0#1|) (<= 0 |ULTIMATE.start_cmemchr_#t~post3#1.offset|) (<= 0 |ULTIMATE.start_main_~nondetArea~0#1.base|) (< (select |#length| |ULTIMATE.start_cmemchr_#t~post3#1.base|) (+ |ULTIMATE.start_cmemchr_#t~post3#1.offset| 1)) (<= 0 |ULTIMATE.start_cmemchr_#t~post3#1.base|) (<= 1 |ULTIMATE.start_cmemchr_~p~0#1.offset|) (<= |ULTIMATE.start_cmemchr_~n#1| 2147483647) (<= 0 |ULTIMATE.start_cmemchr_~s#1.base|) (<= |ULTIMATE.start_main_~c~0#1| 2147483647) (<= 0 |ULTIMATE.start_main_#t~malloc8#1.base|) (<= 0 (+ |ULTIMATE.start_cmemchr_#in~c#1| 2147483648)) (<= 0 |ULTIMATE.start_cmemchr_~s#1.offset|) (<= 1 |ULTIMATE.start_main_~n~0#1|) (<= 1 |ULTIMATE.start_main_~length~0#1|) (<= |ULTIMATE.start_cmemchr_#in~c#1| 2147483647) (= |#NULL.offset| 0) (<= 0 |ULTIMATE.start_cmemchr_~p~0#1.base|) (<= |ULTIMATE.start_cmemchr_#in~n#1| 2147483647) (<= 0 (+ |ULTIMATE.start_main_~c~0#1| 2147483648)) (<= 0 (+ |ULTIMATE.start_cmemchr_~c#1| 2147483648)) (<= 0 |ULTIMATE.start_cmemchr_#in~s#1.base|) (<= |ULTIMATE.start_main_~nondetArea~0#1.offset| 0) (<= 0 |#StackHeapBarrier|) (<= 0 |ULTIMATE.start_cmemchr_#in~s#1.offset|) (<= 1 |ULTIMATE.start_cmemchr_#in~n#1|) (<= |ULTIMATE.start_cmemchr_~c#1| 2147483647) (= |#NULL.base| 0))' at error location [2022-11-03 02:08:44,911 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-03 02:08:44,911 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-03 02:08:44,912 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [28, 32, 32] total 92 [2022-11-03 02:08:44,912 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1593268194] [2022-11-03 02:08:44,912 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-03 02:08:44,912 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 94 states [2022-11-03 02:08:44,913 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-03 02:08:44,913 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 94 interpolants. [2022-11-03 02:08:44,915 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=780, Invalid=9522, Unknown=0, NotChecked=0, Total=10302 [2022-11-03 02:08:44,916 INFO L87 Difference]: Start difference. First operand 74 states and 75 transitions. Second operand has 94 states, 93 states have (on average 1.989247311827957) internal successors, (185), 93 states have internal predecessors, (185), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 02:09:16,873 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-03 02:09:16,873 INFO L93 Difference]: Finished difference Result 123 states and 124 transitions. [2022-11-03 02:09:16,873 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 88 states. [2022-11-03 02:09:16,874 INFO L78 Accepts]: Start accepts. Automaton has has 94 states, 93 states have (on average 1.989247311827957) internal successors, (185), 93 states have internal predecessors, (185), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 73 [2022-11-03 02:09:16,874 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-03 02:09:16,875 INFO L225 Difference]: With dead ends: 123 [2022-11-03 02:09:16,875 INFO L226 Difference]: Without dead ends: 123 [2022-11-03 02:09:16,878 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 331 GetRequests, 145 SyntacticMatches, 0 SemanticMatches, 186 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5553 ImplicationChecksByTransitivity, 40.9s TimeCoverageRelationStatistics Valid=5367, Invalid=29789, Unknown=0, NotChecked=0, Total=35156 [2022-11-03 02:09:16,879 INFO L413 NwaCegarLoop]: 10 mSDtfsCounter, 609 mSDsluCounter, 335 mSDsCounter, 0 mSdLazyCounter, 2317 mSolverCounterSat, 804 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2.8s Time, 0 mProtectedPredicate, 0 mProtectedAction, 609 SdHoareTripleChecker+Valid, 345 SdHoareTripleChecker+Invalid, 3121 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 804 IncrementalHoareTripleChecker+Valid, 2317 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 3.2s IncrementalHoareTripleChecker+Time [2022-11-03 02:09:16,880 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [609 Valid, 345 Invalid, 3121 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [804 Valid, 2317 Invalid, 0 Unknown, 0 Unchecked, 3.2s Time] [2022-11-03 02:09:16,880 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 123 states. [2022-11-03 02:09:16,883 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 123 to 122. [2022-11-03 02:09:16,883 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 122 states, 121 states have (on average 1.0165289256198347) internal successors, (123), 121 states have internal predecessors, (123), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 02:09:16,884 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 122 states to 122 states and 123 transitions. [2022-11-03 02:09:16,884 INFO L78 Accepts]: Start accepts. Automaton has 122 states and 123 transitions. Word has length 73 [2022-11-03 02:09:16,884 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-03 02:09:16,885 INFO L495 AbstractCegarLoop]: Abstraction has 122 states and 123 transitions. [2022-11-03 02:09:16,885 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 94 states, 93 states have (on average 1.989247311827957) internal successors, (185), 93 states have internal predecessors, (185), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 02:09:16,885 INFO L276 IsEmpty]: Start isEmpty. Operand 122 states and 123 transitions. [2022-11-03 02:09:16,887 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 122 [2022-11-03 02:09:16,887 INFO L187 NwaCegarLoop]: Found error trace [2022-11-03 02:09:16,887 INFO L195 NwaCegarLoop]: trace histogram [24, 23, 23, 23, 12, 12, 1, 1, 1, 1] [2022-11-03 02:09:16,937 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_81634ae4-27af-40ae-86b0-f7d8326dcf83/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (20)] Forceful destruction successful, exit code 0 [2022-11-03 02:09:17,113 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable22,20 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_81634ae4-27af-40ae-86b0-f7d8326dcf83/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-03 02:09:17,113 INFO L420 AbstractCegarLoop]: === Iteration 24 === Targeting ULTIMATE.startErr3REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 2 more)] === [2022-11-03 02:09:17,113 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-03 02:09:17,113 INFO L85 PathProgramCache]: Analyzing trace with hash 1622600687, now seen corresponding path program 18 times [2022-11-03 02:09:17,114 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-03 02:09:17,114 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1641700195] [2022-11-03 02:09:17,114 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-03 02:09:17,114 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-03 02:09:17,222 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-03 02:09:18,651 INFO L134 CoverageAnalysis]: Checked inductivity of 1202 backedges. 552 proven. 408 refuted. 0 times theorem prover too weak. 242 trivial. 0 not checked. [2022-11-03 02:09:18,652 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-03 02:09:18,652 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1641700195] [2022-11-03 02:09:18,652 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1641700195] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-03 02:09:18,652 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1679048089] [2022-11-03 02:09:18,652 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-11-03 02:09:18,652 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-03 02:09:18,653 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_81634ae4-27af-40ae-86b0-f7d8326dcf83/bin/utaipan-7li7fVZpFI/z3 [2022-11-03 02:09:18,654 INFO L229 MonitoredProcess]: Starting monitored process 21 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_81634ae4-27af-40ae-86b0-f7d8326dcf83/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-03 02:09:18,665 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_81634ae4-27af-40ae-86b0-f7d8326dcf83/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (21)] Waiting until timeout for monitored process [2022-11-03 02:09:19,078 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-11-03 02:09:19,078 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-03 02:09:19,086 INFO L263 TraceCheckSpWp]: Trace formula consists of 683 conjuncts, 122 conjunts are in the unsatisfiable core [2022-11-03 02:09:19,091 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-03 02:09:19,102 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2022-11-03 02:09:21,130 INFO L134 CoverageAnalysis]: Checked inductivity of 1202 backedges. 826 proven. 156 refuted. 0 times theorem prover too weak. 220 trivial. 0 not checked. [2022-11-03 02:09:21,130 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-03 02:09:23,624 INFO L134 CoverageAnalysis]: Checked inductivity of 1202 backedges. 826 proven. 156 refuted. 0 times theorem prover too weak. 220 trivial. 0 not checked. [2022-11-03 02:09:23,624 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1679048089] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-03 02:09:23,624 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1259950092] [2022-11-03 02:09:23,626 INFO L159 IcfgInterpreter]: Started Sifa with 9 locations of interest [2022-11-03 02:09:23,626 INFO L166 IcfgInterpreter]: Building call graph [2022-11-03 02:09:23,627 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-03 02:09:23,627 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-03 02:09:23,627 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-03 02:09:23,649 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 8 treesize of output 7 [2022-11-03 02:09:23,689 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2022-11-03 02:09:23,724 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-11-03 02:09:24,119 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-03 02:09:27,147 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '8948#(and (<= |ULTIMATE.start_main_~length~0#1| 2147483647) (<= |ULTIMATE.start_main_~n~0#1| 2147483647) (<= |ULTIMATE.start_cmemchr_#in~s#1.offset| 0) (= |ULTIMATE.start_main_#t~malloc8#1.offset| 0) (<= |ULTIMATE.start_cmemchr_~s#1.offset| 0) (<= 0 |ULTIMATE.start_main_~nondetArea~0#1.offset|) (<= 1 |ULTIMATE.start_main_~i~0#1|) (<= 0 |ULTIMATE.start_cmemchr_#t~post3#1.offset|) (<= 0 |ULTIMATE.start_main_~nondetArea~0#1.base|) (< (select |#length| |ULTIMATE.start_cmemchr_#t~post3#1.base|) (+ |ULTIMATE.start_cmemchr_#t~post3#1.offset| 1)) (<= 0 |ULTIMATE.start_cmemchr_#t~post3#1.base|) (<= 1 |ULTIMATE.start_cmemchr_~p~0#1.offset|) (<= |ULTIMATE.start_cmemchr_~n#1| 2147483647) (<= 0 |ULTIMATE.start_cmemchr_~s#1.base|) (<= |ULTIMATE.start_main_~c~0#1| 2147483647) (<= 0 |ULTIMATE.start_main_#t~malloc8#1.base|) (<= 0 (+ |ULTIMATE.start_cmemchr_#in~c#1| 2147483648)) (<= 0 |ULTIMATE.start_cmemchr_~s#1.offset|) (<= 1 |ULTIMATE.start_main_~n~0#1|) (<= 1 |ULTIMATE.start_main_~length~0#1|) (<= |ULTIMATE.start_cmemchr_#in~c#1| 2147483647) (= |#NULL.offset| 0) (<= 0 |ULTIMATE.start_cmemchr_~p~0#1.base|) (<= |ULTIMATE.start_cmemchr_#in~n#1| 2147483647) (<= 0 (+ |ULTIMATE.start_main_~c~0#1| 2147483648)) (<= 0 (+ |ULTIMATE.start_cmemchr_~c#1| 2147483648)) (<= 0 |ULTIMATE.start_cmemchr_#in~s#1.base|) (<= |ULTIMATE.start_main_~nondetArea~0#1.offset| 0) (<= 0 |#StackHeapBarrier|) (<= 0 |ULTIMATE.start_cmemchr_#in~s#1.offset|) (<= 1 |ULTIMATE.start_cmemchr_#in~n#1|) (<= |ULTIMATE.start_cmemchr_~c#1| 2147483647) (= |#NULL.base| 0))' at error location [2022-11-03 02:09:27,147 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-03 02:09:27,147 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-03 02:09:27,148 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [28, 30, 30] total 86 [2022-11-03 02:09:27,148 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [162029174] [2022-11-03 02:09:27,148 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-03 02:09:27,149 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 87 states [2022-11-03 02:09:27,149 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-03 02:09:27,149 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 87 interpolants. [2022-11-03 02:09:27,150 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=563, Invalid=8367, Unknown=0, NotChecked=0, Total=8930 [2022-11-03 02:09:27,150 INFO L87 Difference]: Start difference. First operand 122 states and 123 transitions. Second operand has 87 states, 87 states have (on average 2.689655172413793) internal successors, (234), 86 states have internal predecessors, (234), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 02:09:35,579 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-03 02:09:35,580 INFO L93 Difference]: Finished difference Result 174 states and 175 transitions. [2022-11-03 02:09:35,580 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 44 states. [2022-11-03 02:09:35,580 INFO L78 Accepts]: Start accepts. Automaton has has 87 states, 87 states have (on average 2.689655172413793) internal successors, (234), 86 states have internal predecessors, (234), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 121 [2022-11-03 02:09:35,581 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-03 02:09:35,581 INFO L225 Difference]: With dead ends: 174 [2022-11-03 02:09:35,581 INFO L226 Difference]: Without dead ends: 125 [2022-11-03 02:09:35,582 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 428 GetRequests, 296 SyntacticMatches, 0 SemanticMatches, 132 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3861 ImplicationChecksByTransitivity, 14.0s TimeCoverageRelationStatistics Valid=1679, Invalid=16143, Unknown=0, NotChecked=0, Total=17822 [2022-11-03 02:09:35,583 INFO L413 NwaCegarLoop]: 11 mSDtfsCounter, 327 mSDsluCounter, 408 mSDsCounter, 0 mSdLazyCounter, 2496 mSolverCounterSat, 264 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 327 SdHoareTripleChecker+Valid, 401 SdHoareTripleChecker+Invalid, 2760 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 264 IncrementalHoareTripleChecker+Valid, 2496 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.7s IncrementalHoareTripleChecker+Time [2022-11-03 02:09:35,583 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [327 Valid, 401 Invalid, 2760 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [264 Valid, 2496 Invalid, 0 Unknown, 0 Unchecked, 1.7s Time] [2022-11-03 02:09:35,584 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 125 states. [2022-11-03 02:09:35,586 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 125 to 124. [2022-11-03 02:09:35,587 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 124 states, 123 states have (on average 1.016260162601626) internal successors, (125), 123 states have internal predecessors, (125), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 02:09:35,588 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 124 states to 124 states and 125 transitions. [2022-11-03 02:09:35,588 INFO L78 Accepts]: Start accepts. Automaton has 124 states and 125 transitions. Word has length 121 [2022-11-03 02:09:35,588 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-03 02:09:35,589 INFO L495 AbstractCegarLoop]: Abstraction has 124 states and 125 transitions. [2022-11-03 02:09:35,589 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 87 states, 87 states have (on average 2.689655172413793) internal successors, (234), 86 states have internal predecessors, (234), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 02:09:35,589 INFO L276 IsEmpty]: Start isEmpty. Operand 124 states and 125 transitions. [2022-11-03 02:09:35,591 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 124 [2022-11-03 02:09:35,591 INFO L187 NwaCegarLoop]: Found error trace [2022-11-03 02:09:35,591 INFO L195 NwaCegarLoop]: trace histogram [24, 23, 23, 23, 13, 13, 1, 1, 1, 1] [2022-11-03 02:09:35,629 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_81634ae4-27af-40ae-86b0-f7d8326dcf83/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (21)] Ended with exit code 0 [2022-11-03 02:09:35,805 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 21 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_81634ae4-27af-40ae-86b0-f7d8326dcf83/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable23 [2022-11-03 02:09:35,805 INFO L420 AbstractCegarLoop]: === Iteration 25 === Targeting ULTIMATE.startErr3REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 2 more)] === [2022-11-03 02:09:35,805 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-03 02:09:35,805 INFO L85 PathProgramCache]: Analyzing trace with hash -1310171586, now seen corresponding path program 19 times [2022-11-03 02:09:35,805 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-03 02:09:35,806 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [554178289] [2022-11-03 02:09:35,806 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-03 02:09:35,806 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-03 02:09:35,908 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-03 02:09:37,518 INFO L134 CoverageAnalysis]: Checked inductivity of 1227 backedges. 546 proven. 481 refuted. 0 times theorem prover too weak. 200 trivial. 0 not checked. [2022-11-03 02:09:37,519 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-03 02:09:37,519 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [554178289] [2022-11-03 02:09:37,519 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [554178289] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-03 02:09:37,519 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [308214496] [2022-11-03 02:09:37,519 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-11-03 02:09:37,519 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-03 02:09:37,519 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_81634ae4-27af-40ae-86b0-f7d8326dcf83/bin/utaipan-7li7fVZpFI/z3 [2022-11-03 02:09:37,521 INFO L229 MonitoredProcess]: Starting monitored process 22 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_81634ae4-27af-40ae-86b0-f7d8326dcf83/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-03 02:09:37,522 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_81634ae4-27af-40ae-86b0-f7d8326dcf83/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (22)] Waiting until timeout for monitored process [2022-11-03 02:09:37,817 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-03 02:09:37,823 INFO L263 TraceCheckSpWp]: Trace formula consists of 696 conjuncts, 114 conjunts are in the unsatisfiable core [2022-11-03 02:09:37,826 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-03 02:09:37,841 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2022-11-03 02:09:40,278 INFO L134 CoverageAnalysis]: Checked inductivity of 1227 backedges. 865 proven. 182 refuted. 0 times theorem prover too weak. 180 trivial. 0 not checked. [2022-11-03 02:09:40,279 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-03 02:09:42,920 INFO L134 CoverageAnalysis]: Checked inductivity of 1227 backedges. 865 proven. 182 refuted. 0 times theorem prover too weak. 180 trivial. 0 not checked. [2022-11-03 02:09:42,921 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [308214496] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-03 02:09:42,921 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [497260446] [2022-11-03 02:09:42,923 INFO L159 IcfgInterpreter]: Started Sifa with 9 locations of interest [2022-11-03 02:09:42,923 INFO L166 IcfgInterpreter]: Building call graph [2022-11-03 02:09:42,923 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-03 02:09:42,923 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-03 02:09:42,924 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-03 02:09:42,949 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 8 treesize of output 7 [2022-11-03 02:09:42,991 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2022-11-03 02:09:43,024 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-11-03 02:09:43,400 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-03 02:09:46,430 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '10157#(and (<= |ULTIMATE.start_main_~length~0#1| 2147483647) (<= |ULTIMATE.start_main_~n~0#1| 2147483647) (<= |ULTIMATE.start_cmemchr_#in~s#1.offset| 0) (= |ULTIMATE.start_main_#t~malloc8#1.offset| 0) (<= |ULTIMATE.start_cmemchr_~s#1.offset| 0) (<= 0 |ULTIMATE.start_main_~nondetArea~0#1.offset|) (<= 1 |ULTIMATE.start_main_~i~0#1|) (<= 0 |ULTIMATE.start_cmemchr_#t~post3#1.offset|) (<= 0 |ULTIMATE.start_main_~nondetArea~0#1.base|) (< (select |#length| |ULTIMATE.start_cmemchr_#t~post3#1.base|) (+ |ULTIMATE.start_cmemchr_#t~post3#1.offset| 1)) (<= 0 |ULTIMATE.start_cmemchr_#t~post3#1.base|) (<= 1 |ULTIMATE.start_cmemchr_~p~0#1.offset|) (<= |ULTIMATE.start_cmemchr_~n#1| 2147483647) (<= 0 |ULTIMATE.start_cmemchr_~s#1.base|) (<= |ULTIMATE.start_main_~c~0#1| 2147483647) (<= 0 |ULTIMATE.start_main_#t~malloc8#1.base|) (<= 0 (+ |ULTIMATE.start_cmemchr_#in~c#1| 2147483648)) (<= 0 |ULTIMATE.start_cmemchr_~s#1.offset|) (<= 1 |ULTIMATE.start_main_~n~0#1|) (<= 1 |ULTIMATE.start_main_~length~0#1|) (<= |ULTIMATE.start_cmemchr_#in~c#1| 2147483647) (= |#NULL.offset| 0) (<= 0 |ULTIMATE.start_cmemchr_~p~0#1.base|) (<= |ULTIMATE.start_cmemchr_#in~n#1| 2147483647) (<= 0 (+ |ULTIMATE.start_main_~c~0#1| 2147483648)) (<= 0 (+ |ULTIMATE.start_cmemchr_~c#1| 2147483648)) (<= 0 |ULTIMATE.start_cmemchr_#in~s#1.base|) (<= |ULTIMATE.start_main_~nondetArea~0#1.offset| 0) (<= 0 |#StackHeapBarrier|) (<= 0 |ULTIMATE.start_cmemchr_#in~s#1.offset|) (<= 1 |ULTIMATE.start_cmemchr_#in~n#1|) (<= |ULTIMATE.start_cmemchr_~c#1| 2147483647) (= |#NULL.base| 0))' at error location [2022-11-03 02:09:46,430 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-03 02:09:46,430 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-03 02:09:46,431 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [30, 32, 32] total 92 [2022-11-03 02:09:46,431 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1637991804] [2022-11-03 02:09:46,431 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-03 02:09:46,431 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 93 states [2022-11-03 02:09:46,431 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-03 02:09:46,432 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 93 interpolants. [2022-11-03 02:09:46,433 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=795, Invalid=9305, Unknown=0, NotChecked=0, Total=10100 [2022-11-03 02:09:46,433 INFO L87 Difference]: Start difference. First operand 124 states and 125 transitions. Second operand has 93 states, 93 states have (on average 2.7096774193548385) internal successors, (252), 92 states have internal predecessors, (252), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 02:09:52,546 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-03 02:09:52,547 INFO L93 Difference]: Finished difference Result 180 states and 181 transitions. [2022-11-03 02:09:52,547 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 47 states. [2022-11-03 02:09:52,547 INFO L78 Accepts]: Start accepts. Automaton has has 93 states, 93 states have (on average 2.7096774193548385) internal successors, (252), 92 states have internal predecessors, (252), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 123 [2022-11-03 02:09:52,548 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-03 02:09:52,549 INFO L225 Difference]: With dead ends: 180 [2022-11-03 02:09:52,549 INFO L226 Difference]: Without dead ends: 127 [2022-11-03 02:09:52,550 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 439 GetRequests, 298 SyntacticMatches, 0 SemanticMatches, 141 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3825 ImplicationChecksByTransitivity, 12.2s TimeCoverageRelationStatistics Valid=2104, Invalid=18202, Unknown=0, NotChecked=0, Total=20306 [2022-11-03 02:09:52,551 INFO L413 NwaCegarLoop]: 12 mSDtfsCounter, 276 mSDsluCounter, 480 mSDsCounter, 0 mSdLazyCounter, 2783 mSolverCounterSat, 248 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 276 SdHoareTripleChecker+Valid, 471 SdHoareTripleChecker+Invalid, 3031 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 248 IncrementalHoareTripleChecker+Valid, 2783 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.8s IncrementalHoareTripleChecker+Time [2022-11-03 02:09:52,551 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [276 Valid, 471 Invalid, 3031 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [248 Valid, 2783 Invalid, 0 Unknown, 0 Unchecked, 1.8s Time] [2022-11-03 02:09:52,552 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 127 states. [2022-11-03 02:09:52,554 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 127 to 126. [2022-11-03 02:09:52,555 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 126 states, 125 states have (on average 1.016) internal successors, (127), 125 states have internal predecessors, (127), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 02:09:52,555 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 126 states to 126 states and 127 transitions. [2022-11-03 02:09:52,556 INFO L78 Accepts]: Start accepts. Automaton has 126 states and 127 transitions. Word has length 123 [2022-11-03 02:09:52,556 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-03 02:09:52,556 INFO L495 AbstractCegarLoop]: Abstraction has 126 states and 127 transitions. [2022-11-03 02:09:52,557 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 93 states, 93 states have (on average 2.7096774193548385) internal successors, (252), 92 states have internal predecessors, (252), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 02:09:52,557 INFO L276 IsEmpty]: Start isEmpty. Operand 126 states and 127 transitions. [2022-11-03 02:09:52,558 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 126 [2022-11-03 02:09:52,558 INFO L187 NwaCegarLoop]: Found error trace [2022-11-03 02:09:52,558 INFO L195 NwaCegarLoop]: trace histogram [24, 23, 23, 23, 14, 14, 1, 1, 1, 1] [2022-11-03 02:09:52,605 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_81634ae4-27af-40ae-86b0-f7d8326dcf83/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (22)] Ended with exit code 0 [2022-11-03 02:09:52,781 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable24,22 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_81634ae4-27af-40ae-86b0-f7d8326dcf83/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-03 02:09:52,781 INFO L420 AbstractCegarLoop]: === Iteration 26 === Targeting ULTIMATE.startErr3REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 2 more)] === [2022-11-03 02:09:52,781 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-03 02:09:52,781 INFO L85 PathProgramCache]: Analyzing trace with hash 2089187533, now seen corresponding path program 20 times [2022-11-03 02:09:52,782 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-03 02:09:52,782 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1440198819] [2022-11-03 02:09:52,782 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-03 02:09:52,782 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-03 02:09:52,942 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-03 02:09:54,622 INFO L134 CoverageAnalysis]: Checked inductivity of 1254 backedges. 532 proven. 560 refuted. 0 times theorem prover too weak. 162 trivial. 0 not checked. [2022-11-03 02:09:54,623 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-03 02:09:54,623 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1440198819] [2022-11-03 02:09:54,623 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1440198819] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-03 02:09:54,623 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [259388059] [2022-11-03 02:09:54,623 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-11-03 02:09:54,623 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-03 02:09:54,624 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_81634ae4-27af-40ae-86b0-f7d8326dcf83/bin/utaipan-7li7fVZpFI/z3 [2022-11-03 02:09:54,625 INFO L229 MonitoredProcess]: Starting monitored process 23 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_81634ae4-27af-40ae-86b0-f7d8326dcf83/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-03 02:09:54,660 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_81634ae4-27af-40ae-86b0-f7d8326dcf83/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (23)] Waiting until timeout for monitored process [2022-11-03 02:09:58,784 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 24 check-sat command(s) [2022-11-03 02:09:58,784 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-03 02:09:58,800 INFO L263 TraceCheckSpWp]: Trace formula consists of 709 conjuncts, 186 conjunts are in the unsatisfiable core [2022-11-03 02:09:58,804 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-03 02:09:58,815 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2022-11-03 02:10:01,972 INFO L134 CoverageAnalysis]: Checked inductivity of 1254 backedges. 1036 proven. 218 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-03 02:10:01,973 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-03 02:10:05,860 INFO L134 CoverageAnalysis]: Checked inductivity of 1254 backedges. 1036 proven. 218 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-03 02:10:05,861 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [259388059] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-03 02:10:05,861 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [417505461] [2022-11-03 02:10:05,862 INFO L159 IcfgInterpreter]: Started Sifa with 9 locations of interest [2022-11-03 02:10:05,862 INFO L166 IcfgInterpreter]: Building call graph [2022-11-03 02:10:05,862 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-03 02:10:05,863 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-03 02:10:05,863 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-03 02:10:05,878 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 8 treesize of output 7 [2022-11-03 02:10:05,908 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-11-03 02:10:05,971 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-11-03 02:10:06,351 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-03 02:10:09,857 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '11414#(and (<= |ULTIMATE.start_main_~length~0#1| 2147483647) (<= |ULTIMATE.start_main_~n~0#1| 2147483647) (<= |ULTIMATE.start_cmemchr_#in~s#1.offset| 0) (= |ULTIMATE.start_main_#t~malloc8#1.offset| 0) (<= |ULTIMATE.start_cmemchr_~s#1.offset| 0) (<= 0 |ULTIMATE.start_main_~nondetArea~0#1.offset|) (<= 1 |ULTIMATE.start_main_~i~0#1|) (<= 0 |ULTIMATE.start_cmemchr_#t~post3#1.offset|) (<= 0 |ULTIMATE.start_main_~nondetArea~0#1.base|) (< (select |#length| |ULTIMATE.start_cmemchr_#t~post3#1.base|) (+ |ULTIMATE.start_cmemchr_#t~post3#1.offset| 1)) (<= 0 |ULTIMATE.start_cmemchr_#t~post3#1.base|) (<= 1 |ULTIMATE.start_cmemchr_~p~0#1.offset|) (<= |ULTIMATE.start_cmemchr_~n#1| 2147483647) (<= 0 |ULTIMATE.start_cmemchr_~s#1.base|) (<= |ULTIMATE.start_main_~c~0#1| 2147483647) (<= 0 |ULTIMATE.start_main_#t~malloc8#1.base|) (<= 0 (+ |ULTIMATE.start_cmemchr_#in~c#1| 2147483648)) (<= 0 |ULTIMATE.start_cmemchr_~s#1.offset|) (<= 1 |ULTIMATE.start_main_~n~0#1|) (<= 1 |ULTIMATE.start_main_~length~0#1|) (<= |ULTIMATE.start_cmemchr_#in~c#1| 2147483647) (= |#NULL.offset| 0) (<= 0 |ULTIMATE.start_cmemchr_~p~0#1.base|) (<= |ULTIMATE.start_cmemchr_#in~n#1| 2147483647) (<= 0 (+ |ULTIMATE.start_main_~c~0#1| 2147483648)) (<= 0 (+ |ULTIMATE.start_cmemchr_~c#1| 2147483648)) (<= 0 |ULTIMATE.start_cmemchr_#in~s#1.base|) (<= |ULTIMATE.start_main_~nondetArea~0#1.offset| 0) (<= 0 |#StackHeapBarrier|) (<= 0 |ULTIMATE.start_cmemchr_#in~s#1.offset|) (<= 1 |ULTIMATE.start_cmemchr_#in~n#1|) (<= |ULTIMATE.start_cmemchr_~c#1| 2147483647) (= |#NULL.base| 0))' at error location [2022-11-03 02:10:09,857 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-03 02:10:09,857 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-03 02:10:09,858 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [32, 42, 42] total 114 [2022-11-03 02:10:09,858 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2073432446] [2022-11-03 02:10:09,858 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-03 02:10:09,859 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 115 states [2022-11-03 02:10:09,859 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-03 02:10:09,860 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 115 interpolants. [2022-11-03 02:10:09,861 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1426, Invalid=13580, Unknown=0, NotChecked=0, Total=15006 [2022-11-03 02:10:09,862 INFO L87 Difference]: Start difference. First operand 126 states and 127 transitions. Second operand has 115 states, 115 states have (on average 2.9043478260869566) internal successors, (334), 114 states have internal predecessors, (334), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 02:10:25,797 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-03 02:10:25,798 INFO L93 Difference]: Finished difference Result 292 states and 300 transitions. [2022-11-03 02:10:25,798 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 82 states. [2022-11-03 02:10:25,798 INFO L78 Accepts]: Start accepts. Automaton has has 115 states, 115 states have (on average 2.9043478260869566) internal successors, (334), 114 states have internal predecessors, (334), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 125 [2022-11-03 02:10:25,799 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-03 02:10:25,800 INFO L225 Difference]: With dead ends: 292 [2022-11-03 02:10:25,800 INFO L226 Difference]: Without dead ends: 144 [2022-11-03 02:10:25,802 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 481 GetRequests, 284 SyntacticMatches, 0 SemanticMatches, 197 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 9313 ImplicationChecksByTransitivity, 23.3s TimeCoverageRelationStatistics Valid=5266, Invalid=34136, Unknown=0, NotChecked=0, Total=39402 [2022-11-03 02:10:25,802 INFO L413 NwaCegarLoop]: 14 mSDtfsCounter, 357 mSDsluCounter, 917 mSDsCounter, 0 mSdLazyCounter, 3987 mSolverCounterSat, 275 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 357 SdHoareTripleChecker+Valid, 780 SdHoareTripleChecker+Invalid, 4262 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 275 IncrementalHoareTripleChecker+Valid, 3987 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 2.6s IncrementalHoareTripleChecker+Time [2022-11-03 02:10:25,802 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [357 Valid, 780 Invalid, 4262 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [275 Valid, 3987 Invalid, 0 Unknown, 0 Unchecked, 2.6s Time] [2022-11-03 02:10:25,803 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 144 states. [2022-11-03 02:10:25,806 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 144 to 144. [2022-11-03 02:10:25,806 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 144 states, 143 states have (on average 1.013986013986014) internal successors, (145), 143 states have internal predecessors, (145), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 02:10:25,807 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 144 states to 144 states and 145 transitions. [2022-11-03 02:10:25,807 INFO L78 Accepts]: Start accepts. Automaton has 144 states and 145 transitions. Word has length 125 [2022-11-03 02:10:25,807 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-03 02:10:25,807 INFO L495 AbstractCegarLoop]: Abstraction has 144 states and 145 transitions. [2022-11-03 02:10:25,808 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 115 states, 115 states have (on average 2.9043478260869566) internal successors, (334), 114 states have internal predecessors, (334), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 02:10:25,808 INFO L276 IsEmpty]: Start isEmpty. Operand 144 states and 145 transitions. [2022-11-03 02:10:25,808 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 144 [2022-11-03 02:10:25,809 INFO L187 NwaCegarLoop]: Found error trace [2022-11-03 02:10:25,809 INFO L195 NwaCegarLoop]: trace histogram [24, 23, 23, 23, 23, 23, 1, 1, 1, 1] [2022-11-03 02:10:25,816 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_81634ae4-27af-40ae-86b0-f7d8326dcf83/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (23)] Forceful destruction successful, exit code 0 [2022-11-03 02:10:26,009 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 23 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_81634ae4-27af-40ae-86b0-f7d8326dcf83/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable25 [2022-11-03 02:10:26,009 INFO L420 AbstractCegarLoop]: === Iteration 27 === Targeting ULTIMATE.startErr3REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 2 more)] === [2022-11-03 02:10:26,010 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-03 02:10:26,010 INFO L85 PathProgramCache]: Analyzing trace with hash 1459596052, now seen corresponding path program 21 times [2022-11-03 02:10:26,010 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-03 02:10:26,010 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1766655648] [2022-11-03 02:10:26,010 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-03 02:10:26,010 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-03 02:10:26,169 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-03 02:10:29,606 INFO L134 CoverageAnalysis]: Checked inductivity of 1587 backedges. 46 proven. 1541 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-03 02:10:29,607 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-03 02:10:29,607 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1766655648] [2022-11-03 02:10:29,607 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1766655648] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-03 02:10:29,607 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2138792512] [2022-11-03 02:10:29,607 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-11-03 02:10:29,607 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-03 02:10:29,607 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_81634ae4-27af-40ae-86b0-f7d8326dcf83/bin/utaipan-7li7fVZpFI/z3 [2022-11-03 02:10:29,608 INFO L229 MonitoredProcess]: Starting monitored process 24 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_81634ae4-27af-40ae-86b0-f7d8326dcf83/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-03 02:10:29,610 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_81634ae4-27af-40ae-86b0-f7d8326dcf83/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (24)] Waiting until timeout for monitored process [2022-11-03 02:10:30,610 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-11-03 02:10:30,610 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-03 02:10:30,619 INFO L263 TraceCheckSpWp]: Trace formula consists of 826 conjuncts, 100 conjunts are in the unsatisfiable core [2022-11-03 02:10:30,623 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-03 02:10:31,221 INFO L134 CoverageAnalysis]: Checked inductivity of 1587 backedges. 46 proven. 1541 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-03 02:10:31,221 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-03 02:10:36,371 INFO L134 CoverageAnalysis]: Checked inductivity of 1587 backedges. 46 proven. 1541 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-03 02:10:36,371 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2138792512] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-03 02:10:36,371 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [165498533] [2022-11-03 02:10:36,373 INFO L159 IcfgInterpreter]: Started Sifa with 9 locations of interest [2022-11-03 02:10:36,373 INFO L166 IcfgInterpreter]: Building call graph [2022-11-03 02:10:36,373 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-03 02:10:36,373 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-03 02:10:36,373 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-03 02:10:36,391 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 8 treesize of output 7 [2022-11-03 02:10:36,424 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-11-03 02:10:36,466 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-11-03 02:10:36,837 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-03 02:10:40,545 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '12964#(and (<= |ULTIMATE.start_main_~length~0#1| 2147483647) (<= |ULTIMATE.start_main_~n~0#1| 2147483647) (<= |ULTIMATE.start_cmemchr_#in~s#1.offset| 0) (= |ULTIMATE.start_main_#t~malloc8#1.offset| 0) (<= |ULTIMATE.start_cmemchr_~s#1.offset| 0) (<= 0 |ULTIMATE.start_main_~nondetArea~0#1.offset|) (<= 1 |ULTIMATE.start_main_~i~0#1|) (<= 0 |ULTIMATE.start_cmemchr_#t~post3#1.offset|) (<= 0 |ULTIMATE.start_main_~nondetArea~0#1.base|) (< (select |#length| |ULTIMATE.start_cmemchr_#t~post3#1.base|) (+ |ULTIMATE.start_cmemchr_#t~post3#1.offset| 1)) (<= 0 |ULTIMATE.start_cmemchr_#t~post3#1.base|) (<= 1 |ULTIMATE.start_cmemchr_~p~0#1.offset|) (<= |ULTIMATE.start_cmemchr_~n#1| 2147483647) (<= 0 |ULTIMATE.start_cmemchr_~s#1.base|) (<= |ULTIMATE.start_main_~c~0#1| 2147483647) (<= 0 |ULTIMATE.start_main_#t~malloc8#1.base|) (<= 0 (+ |ULTIMATE.start_cmemchr_#in~c#1| 2147483648)) (<= 0 |ULTIMATE.start_cmemchr_~s#1.offset|) (<= 1 |ULTIMATE.start_main_~n~0#1|) (<= 1 |ULTIMATE.start_main_~length~0#1|) (<= |ULTIMATE.start_cmemchr_#in~c#1| 2147483647) (= |#NULL.offset| 0) (<= 0 |ULTIMATE.start_cmemchr_~p~0#1.base|) (<= |ULTIMATE.start_cmemchr_#in~n#1| 2147483647) (<= 0 (+ |ULTIMATE.start_main_~c~0#1| 2147483648)) (<= 0 (+ |ULTIMATE.start_cmemchr_~c#1| 2147483648)) (<= 0 |ULTIMATE.start_cmemchr_#in~s#1.base|) (<= |ULTIMATE.start_main_~nondetArea~0#1.offset| 0) (<= 0 |#StackHeapBarrier|) (<= 0 |ULTIMATE.start_cmemchr_#in~s#1.offset|) (<= 1 |ULTIMATE.start_cmemchr_#in~n#1|) (<= |ULTIMATE.start_cmemchr_~c#1| 2147483647) (= |#NULL.base| 0))' at error location [2022-11-03 02:10:40,545 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-03 02:10:40,546 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-03 02:10:40,546 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [50, 50, 50] total 101 [2022-11-03 02:10:40,546 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1861323412] [2022-11-03 02:10:40,547 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-03 02:10:40,548 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 102 states [2022-11-03 02:10:40,548 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-03 02:10:40,548 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 102 interpolants. [2022-11-03 02:10:40,550 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=287, Invalid=11703, Unknown=0, NotChecked=0, Total=11990 [2022-11-03 02:10:40,550 INFO L87 Difference]: Start difference. First operand 144 states and 145 transitions. Second operand has 102 states, 102 states have (on average 2.823529411764706) internal successors, (288), 101 states have internal predecessors, (288), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 02:10:48,926 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-03 02:10:48,926 INFO L93 Difference]: Finished difference Result 240 states and 241 transitions. [2022-11-03 02:10:48,926 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 73 states. [2022-11-03 02:10:48,927 INFO L78 Accepts]: Start accepts. Automaton has has 102 states, 102 states have (on average 2.823529411764706) internal successors, (288), 101 states have internal predecessors, (288), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 143 [2022-11-03 02:10:48,927 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-03 02:10:48,928 INFO L225 Difference]: With dead ends: 240 [2022-11-03 02:10:48,928 INFO L226 Difference]: Without dead ends: 147 [2022-11-03 02:10:48,930 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 523 GetRequests, 368 SyntacticMatches, 1 SemanticMatches, 154 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3214 ImplicationChecksByTransitivity, 14.7s TimeCoverageRelationStatistics Valid=566, Invalid=23614, Unknown=0, NotChecked=0, Total=24180 [2022-11-03 02:10:48,930 INFO L413 NwaCegarLoop]: 69 mSDtfsCounter, 213 mSDsluCounter, 5073 mSDsCounter, 0 mSdLazyCounter, 5536 mSolverCounterSat, 95 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 3.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 213 SdHoareTripleChecker+Valid, 5103 SdHoareTripleChecker+Invalid, 5631 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 95 IncrementalHoareTripleChecker+Valid, 5536 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 3.9s IncrementalHoareTripleChecker+Time [2022-11-03 02:10:48,931 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [213 Valid, 5103 Invalid, 5631 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [95 Valid, 5536 Invalid, 0 Unknown, 0 Unchecked, 3.9s Time] [2022-11-03 02:10:48,931 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 147 states. [2022-11-03 02:10:48,934 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 147 to 146. [2022-11-03 02:10:48,935 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 146 states, 145 states have (on average 1.013793103448276) internal successors, (147), 145 states have internal predecessors, (147), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 02:10:48,936 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 146 states to 146 states and 147 transitions. [2022-11-03 02:10:48,936 INFO L78 Accepts]: Start accepts. Automaton has 146 states and 147 transitions. Word has length 143 [2022-11-03 02:10:48,936 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-03 02:10:48,936 INFO L495 AbstractCegarLoop]: Abstraction has 146 states and 147 transitions. [2022-11-03 02:10:48,937 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 102 states, 102 states have (on average 2.823529411764706) internal successors, (288), 101 states have internal predecessors, (288), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 02:10:48,937 INFO L276 IsEmpty]: Start isEmpty. Operand 146 states and 147 transitions. [2022-11-03 02:10:48,938 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 146 [2022-11-03 02:10:48,938 INFO L187 NwaCegarLoop]: Found error trace [2022-11-03 02:10:48,939 INFO L195 NwaCegarLoop]: trace histogram [24, 24, 24, 23, 23, 23, 1, 1, 1, 1] [2022-11-03 02:10:48,978 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_81634ae4-27af-40ae-86b0-f7d8326dcf83/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (24)] Forceful destruction successful, exit code 0 [2022-11-03 02:10:49,157 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 24 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_81634ae4-27af-40ae-86b0-f7d8326dcf83/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable26 [2022-11-03 02:10:49,158 INFO L420 AbstractCegarLoop]: === Iteration 28 === Targeting ULTIMATE.startErr3REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 2 more)] === [2022-11-03 02:10:49,158 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-03 02:10:49,159 INFO L85 PathProgramCache]: Analyzing trace with hash 956164131, now seen corresponding path program 22 times [2022-11-03 02:10:49,159 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-03 02:10:49,159 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1901135043] [2022-11-03 02:10:49,160 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-03 02:10:49,160 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-03 02:10:49,335 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-03 02:10:54,200 INFO L134 CoverageAnalysis]: Checked inductivity of 1634 backedges. 506 proven. 1128 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-03 02:10:54,201 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-03 02:10:54,201 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1901135043] [2022-11-03 02:10:54,201 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1901135043] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-03 02:10:54,201 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [707586770] [2022-11-03 02:10:54,201 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-11-03 02:10:54,201 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-03 02:10:54,201 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_81634ae4-27af-40ae-86b0-f7d8326dcf83/bin/utaipan-7li7fVZpFI/z3 [2022-11-03 02:10:54,203 INFO L229 MonitoredProcess]: Starting monitored process 25 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_81634ae4-27af-40ae-86b0-f7d8326dcf83/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-03 02:10:54,204 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_81634ae4-27af-40ae-86b0-f7d8326dcf83/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (25)] Waiting until timeout for monitored process [2022-11-03 02:10:54,501 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-03 02:10:54,512 INFO L263 TraceCheckSpWp]: Trace formula consists of 839 conjuncts, 225 conjunts are in the unsatisfiable core [2022-11-03 02:10:54,518 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-03 02:10:55,198 INFO L134 CoverageAnalysis]: Checked inductivity of 1634 backedges. 552 proven. 1082 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-03 02:10:55,198 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-03 02:10:57,587 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 7 treesize of output 5 [2022-11-03 02:10:58,009 INFO L134 CoverageAnalysis]: Checked inductivity of 1634 backedges. 552 proven. 1082 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-03 02:10:58,010 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [707586770] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-03 02:10:58,010 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [673614548] [2022-11-03 02:10:58,011 INFO L159 IcfgInterpreter]: Started Sifa with 9 locations of interest [2022-11-03 02:10:58,011 INFO L166 IcfgInterpreter]: Building call graph [2022-11-03 02:10:58,011 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-03 02:10:58,011 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-03 02:10:58,012 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-03 02:10:58,031 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 8 treesize of output 7 [2022-11-03 02:10:58,067 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2022-11-03 02:10:58,103 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-11-03 02:10:58,484 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-03 02:11:01,726 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '14398#(and (<= |ULTIMATE.start_main_~length~0#1| 2147483647) (<= |ULTIMATE.start_main_~n~0#1| 2147483647) (<= |ULTIMATE.start_cmemchr_#in~s#1.offset| 0) (= |ULTIMATE.start_main_#t~malloc8#1.offset| 0) (<= |ULTIMATE.start_cmemchr_~s#1.offset| 0) (<= 0 |ULTIMATE.start_main_~nondetArea~0#1.offset|) (<= 1 |ULTIMATE.start_main_~i~0#1|) (<= 0 |ULTIMATE.start_cmemchr_#t~post3#1.offset|) (<= 0 |ULTIMATE.start_main_~nondetArea~0#1.base|) (< (select |#length| |ULTIMATE.start_cmemchr_#t~post3#1.base|) (+ |ULTIMATE.start_cmemchr_#t~post3#1.offset| 1)) (<= 0 |ULTIMATE.start_cmemchr_#t~post3#1.base|) (<= 1 |ULTIMATE.start_cmemchr_~p~0#1.offset|) (<= |ULTIMATE.start_cmemchr_~n#1| 2147483647) (<= 0 |ULTIMATE.start_cmemchr_~s#1.base|) (<= |ULTIMATE.start_main_~c~0#1| 2147483647) (<= 0 |ULTIMATE.start_main_#t~malloc8#1.base|) (<= 0 (+ |ULTIMATE.start_cmemchr_#in~c#1| 2147483648)) (<= 0 |ULTIMATE.start_cmemchr_~s#1.offset|) (<= 1 |ULTIMATE.start_main_~n~0#1|) (<= 1 |ULTIMATE.start_main_~length~0#1|) (<= |ULTIMATE.start_cmemchr_#in~c#1| 2147483647) (= |#NULL.offset| 0) (<= 0 |ULTIMATE.start_cmemchr_~p~0#1.base|) (<= |ULTIMATE.start_cmemchr_#in~n#1| 2147483647) (<= 0 (+ |ULTIMATE.start_main_~c~0#1| 2147483648)) (<= 0 (+ |ULTIMATE.start_cmemchr_~c#1| 2147483648)) (<= 0 |ULTIMATE.start_cmemchr_#in~s#1.base|) (<= |ULTIMATE.start_main_~nondetArea~0#1.offset| 0) (<= 0 |#StackHeapBarrier|) (<= 0 |ULTIMATE.start_cmemchr_#in~s#1.offset|) (<= 1 |ULTIMATE.start_cmemchr_#in~n#1|) (<= |ULTIMATE.start_cmemchr_~c#1| 2147483647) (= |#NULL.base| 0))' at error location [2022-11-03 02:11:01,726 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-03 02:11:01,726 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-03 02:11:01,727 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [52, 52, 52] total 82 [2022-11-03 02:11:01,727 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1824827060] [2022-11-03 02:11:01,727 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-03 02:11:01,727 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 84 states [2022-11-03 02:11:01,728 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-03 02:11:01,728 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 84 interpolants. [2022-11-03 02:11:01,729 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=767, Invalid=7605, Unknown=0, NotChecked=0, Total=8372 [2022-11-03 02:11:01,729 INFO L87 Difference]: Start difference. First operand 146 states and 147 transitions. Second operand has 84 states, 83 states have (on average 2.9759036144578315) internal successors, (247), 83 states have internal predecessors, (247), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 02:11:07,098 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-03 02:11:07,098 INFO L93 Difference]: Finished difference Result 152 states and 153 transitions. [2022-11-03 02:11:07,099 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 78 states. [2022-11-03 02:11:07,099 INFO L78 Accepts]: Start accepts. Automaton has has 84 states, 83 states have (on average 2.9759036144578315) internal successors, (247), 83 states have internal predecessors, (247), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 145 [2022-11-03 02:11:07,099 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-03 02:11:07,100 INFO L225 Difference]: With dead ends: 152 [2022-11-03 02:11:07,100 INFO L226 Difference]: Without dead ends: 152 [2022-11-03 02:11:07,101 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 537 GetRequests, 371 SyntacticMatches, 24 SemanticMatches, 142 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4117 ImplicationChecksByTransitivity, 9.8s TimeCoverageRelationStatistics Valid=3107, Invalid=17485, Unknown=0, NotChecked=0, Total=20592 [2022-11-03 02:11:07,102 INFO L413 NwaCegarLoop]: 23 mSDtfsCounter, 573 mSDsluCounter, 1234 mSDsCounter, 0 mSdLazyCounter, 3935 mSolverCounterSat, 195 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 573 SdHoareTripleChecker+Valid, 650 SdHoareTripleChecker+Invalid, 4130 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 195 IncrementalHoareTripleChecker+Valid, 3935 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 2.5s IncrementalHoareTripleChecker+Time [2022-11-03 02:11:07,103 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [573 Valid, 650 Invalid, 4130 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [195 Valid, 3935 Invalid, 0 Unknown, 0 Unchecked, 2.5s Time] [2022-11-03 02:11:07,104 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 152 states. [2022-11-03 02:11:07,106 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 152 to 150. [2022-11-03 02:11:07,107 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 150 states, 149 states have (on average 1.0134228187919463) internal successors, (151), 149 states have internal predecessors, (151), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 02:11:07,108 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 150 states to 150 states and 151 transitions. [2022-11-03 02:11:07,108 INFO L78 Accepts]: Start accepts. Automaton has 150 states and 151 transitions. Word has length 145 [2022-11-03 02:11:07,109 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-03 02:11:07,109 INFO L495 AbstractCegarLoop]: Abstraction has 150 states and 151 transitions. [2022-11-03 02:11:07,109 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 84 states, 83 states have (on average 2.9759036144578315) internal successors, (247), 83 states have internal predecessors, (247), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 02:11:07,109 INFO L276 IsEmpty]: Start isEmpty. Operand 150 states and 151 transitions. [2022-11-03 02:11:07,110 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 150 [2022-11-03 02:11:07,111 INFO L187 NwaCegarLoop]: Found error trace [2022-11-03 02:11:07,111 INFO L195 NwaCegarLoop]: trace histogram [25, 24, 24, 24, 24, 24, 1, 1, 1, 1] [2022-11-03 02:11:07,146 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_81634ae4-27af-40ae-86b0-f7d8326dcf83/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (25)] Forceful destruction successful, exit code 0 [2022-11-03 02:11:07,329 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 25 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_81634ae4-27af-40ae-86b0-f7d8326dcf83/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable27 [2022-11-03 02:11:07,329 INFO L420 AbstractCegarLoop]: === Iteration 29 === Targeting ULTIMATE.startErr3REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 2 more)] === [2022-11-03 02:11:07,329 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-03 02:11:07,329 INFO L85 PathProgramCache]: Analyzing trace with hash 968654291, now seen corresponding path program 23 times [2022-11-03 02:11:07,329 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-03 02:11:07,329 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1012715271] [2022-11-03 02:11:07,330 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-03 02:11:07,330 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-03 02:11:07,458 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-03 02:11:10,546 INFO L134 CoverageAnalysis]: Checked inductivity of 1728 backedges. 48 proven. 1680 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-03 02:11:10,546 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-03 02:11:10,546 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1012715271] [2022-11-03 02:11:10,546 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1012715271] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-03 02:11:10,547 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [10282199] [2022-11-03 02:11:10,547 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-11-03 02:11:10,547 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-03 02:11:10,547 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_81634ae4-27af-40ae-86b0-f7d8326dcf83/bin/utaipan-7li7fVZpFI/z3 [2022-11-03 02:11:10,548 INFO L229 MonitoredProcess]: Starting monitored process 26 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_81634ae4-27af-40ae-86b0-f7d8326dcf83/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-03 02:11:10,549 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_81634ae4-27af-40ae-86b0-f7d8326dcf83/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (26)] Waiting until timeout for monitored process [2022-11-03 02:11:26,656 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 25 check-sat command(s) [2022-11-03 02:11:26,657 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-03 02:11:26,677 INFO L263 TraceCheckSpWp]: Trace formula consists of 859 conjuncts, 107 conjunts are in the unsatisfiable core [2022-11-03 02:11:26,680 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-03 02:11:27,403 INFO L134 CoverageAnalysis]: Checked inductivity of 1728 backedges. 48 proven. 1680 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-03 02:11:27,404 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-03 02:11:35,306 INFO L134 CoverageAnalysis]: Checked inductivity of 1728 backedges. 52 proven. 1676 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-03 02:11:35,306 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [10282199] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-03 02:11:35,306 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [138493880] [2022-11-03 02:11:35,307 INFO L159 IcfgInterpreter]: Started Sifa with 9 locations of interest [2022-11-03 02:11:35,308 INFO L166 IcfgInterpreter]: Building call graph [2022-11-03 02:11:35,308 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-03 02:11:35,308 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-03 02:11:35,308 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-03 02:11:35,329 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 8 treesize of output 7 [2022-11-03 02:11:35,365 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-11-03 02:11:35,395 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-11-03 02:11:35,771 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-03 02:11:39,244 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '15808#(and (<= |ULTIMATE.start_main_~length~0#1| 2147483647) (<= |ULTIMATE.start_main_~n~0#1| 2147483647) (<= |ULTIMATE.start_cmemchr_#in~s#1.offset| 0) (= |ULTIMATE.start_main_#t~malloc8#1.offset| 0) (<= |ULTIMATE.start_cmemchr_~s#1.offset| 0) (<= 0 |ULTIMATE.start_main_~nondetArea~0#1.offset|) (<= 1 |ULTIMATE.start_main_~i~0#1|) (<= 0 |ULTIMATE.start_cmemchr_#t~post3#1.offset|) (<= 0 |ULTIMATE.start_main_~nondetArea~0#1.base|) (< (select |#length| |ULTIMATE.start_cmemchr_#t~post3#1.base|) (+ |ULTIMATE.start_cmemchr_#t~post3#1.offset| 1)) (<= 0 |ULTIMATE.start_cmemchr_#t~post3#1.base|) (<= 1 |ULTIMATE.start_cmemchr_~p~0#1.offset|) (<= |ULTIMATE.start_cmemchr_~n#1| 2147483647) (<= 0 |ULTIMATE.start_cmemchr_~s#1.base|) (<= |ULTIMATE.start_main_~c~0#1| 2147483647) (<= 0 |ULTIMATE.start_main_#t~malloc8#1.base|) (<= 0 (+ |ULTIMATE.start_cmemchr_#in~c#1| 2147483648)) (<= 0 |ULTIMATE.start_cmemchr_~s#1.offset|) (<= 1 |ULTIMATE.start_main_~n~0#1|) (<= 1 |ULTIMATE.start_main_~length~0#1|) (<= |ULTIMATE.start_cmemchr_#in~c#1| 2147483647) (= |#NULL.offset| 0) (<= 0 |ULTIMATE.start_cmemchr_~p~0#1.base|) (<= |ULTIMATE.start_cmemchr_#in~n#1| 2147483647) (<= 0 (+ |ULTIMATE.start_main_~c~0#1| 2147483648)) (<= 0 (+ |ULTIMATE.start_cmemchr_~c#1| 2147483648)) (<= 0 |ULTIMATE.start_cmemchr_#in~s#1.base|) (<= |ULTIMATE.start_main_~nondetArea~0#1.offset| 0) (<= 0 |#StackHeapBarrier|) (<= 0 |ULTIMATE.start_cmemchr_#in~s#1.offset|) (<= 1 |ULTIMATE.start_cmemchr_#in~n#1|) (<= |ULTIMATE.start_cmemchr_~c#1| 2147483647) (= |#NULL.base| 0))' at error location [2022-11-03 02:11:39,244 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-03 02:11:39,244 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-03 02:11:39,244 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [52, 53, 53] total 107 [2022-11-03 02:11:39,244 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1588392956] [2022-11-03 02:11:39,244 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-03 02:11:39,245 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 108 states [2022-11-03 02:11:39,245 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-03 02:11:39,246 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 108 interpolants. [2022-11-03 02:11:39,246 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=357, Invalid=12983, Unknown=0, NotChecked=0, Total=13340 [2022-11-03 02:11:39,247 INFO L87 Difference]: Start difference. First operand 150 states and 151 transitions. Second operand has 108 states, 108 states have (on average 2.7962962962962963) internal successors, (302), 107 states have internal predecessors, (302), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 02:11:49,211 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-03 02:11:49,212 INFO L93 Difference]: Finished difference Result 250 states and 251 transitions. [2022-11-03 02:11:49,212 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 77 states. [2022-11-03 02:11:49,212 INFO L78 Accepts]: Start accepts. Automaton has has 108 states, 108 states have (on average 2.7962962962962963) internal successors, (302), 107 states have internal predecessors, (302), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 149 [2022-11-03 02:11:49,212 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-03 02:11:49,213 INFO L225 Difference]: With dead ends: 250 [2022-11-03 02:11:49,213 INFO L226 Difference]: Without dead ends: 153 [2022-11-03 02:11:49,215 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 547 GetRequests, 382 SyntacticMatches, 1 SemanticMatches, 164 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3733 ImplicationChecksByTransitivity, 17.8s TimeCoverageRelationStatistics Valid=715, Invalid=26675, Unknown=0, NotChecked=0, Total=27390 [2022-11-03 02:11:49,216 INFO L413 NwaCegarLoop]: 71 mSDtfsCounter, 153 mSDsluCounter, 4501 mSDsCounter, 0 mSdLazyCounter, 5023 mSolverCounterSat, 81 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 3.8s Time, 0 mProtectedPredicate, 0 mProtectedAction, 153 SdHoareTripleChecker+Valid, 4537 SdHoareTripleChecker+Invalid, 5104 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 81 IncrementalHoareTripleChecker+Valid, 5023 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 4.3s IncrementalHoareTripleChecker+Time [2022-11-03 02:11:49,216 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [153 Valid, 4537 Invalid, 5104 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [81 Valid, 5023 Invalid, 0 Unknown, 0 Unchecked, 4.3s Time] [2022-11-03 02:11:49,217 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 153 states. [2022-11-03 02:11:49,219 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 153 to 152. [2022-11-03 02:11:49,219 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 152 states, 151 states have (on average 1.0132450331125828) internal successors, (153), 151 states have internal predecessors, (153), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 02:11:49,220 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 152 states to 152 states and 153 transitions. [2022-11-03 02:11:49,220 INFO L78 Accepts]: Start accepts. Automaton has 152 states and 153 transitions. Word has length 149 [2022-11-03 02:11:49,221 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-03 02:11:49,221 INFO L495 AbstractCegarLoop]: Abstraction has 152 states and 153 transitions. [2022-11-03 02:11:49,221 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 108 states, 108 states have (on average 2.7962962962962963) internal successors, (302), 107 states have internal predecessors, (302), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 02:11:49,221 INFO L276 IsEmpty]: Start isEmpty. Operand 152 states and 153 transitions. [2022-11-03 02:11:49,222 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 152 [2022-11-03 02:11:49,222 INFO L187 NwaCegarLoop]: Found error trace [2022-11-03 02:11:49,222 INFO L195 NwaCegarLoop]: trace histogram [25, 25, 25, 24, 24, 24, 1, 1, 1, 1] [2022-11-03 02:11:49,241 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_81634ae4-27af-40ae-86b0-f7d8326dcf83/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (26)] Forceful destruction successful, exit code 0 [2022-11-03 02:11:49,434 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 26 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_81634ae4-27af-40ae-86b0-f7d8326dcf83/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable28 [2022-11-03 02:11:49,434 INFO L420 AbstractCegarLoop]: === Iteration 30 === Targeting ULTIMATE.startErr3REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 2 more)] === [2022-11-03 02:11:49,435 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-03 02:11:49,435 INFO L85 PathProgramCache]: Analyzing trace with hash 450261922, now seen corresponding path program 24 times [2022-11-03 02:11:49,435 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-03 02:11:49,435 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1593943415] [2022-11-03 02:11:49,436 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-03 02:11:49,436 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-03 02:11:49,531 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-03 02:11:53,138 INFO L134 CoverageAnalysis]: Checked inductivity of 1777 backedges. 552 proven. 1225 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-03 02:11:53,139 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-03 02:11:53,139 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1593943415] [2022-11-03 02:11:53,139 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1593943415] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-03 02:11:53,139 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [151551349] [2022-11-03 02:11:53,139 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-11-03 02:11:53,139 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-03 02:11:53,139 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_81634ae4-27af-40ae-86b0-f7d8326dcf83/bin/utaipan-7li7fVZpFI/z3 [2022-11-03 02:11:53,140 INFO L229 MonitoredProcess]: Starting monitored process 27 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_81634ae4-27af-40ae-86b0-f7d8326dcf83/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-03 02:11:53,143 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_81634ae4-27af-40ae-86b0-f7d8326dcf83/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (27)] Waiting until timeout for monitored process [2022-11-03 02:11:53,694 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-11-03 02:11:53,694 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-03 02:11:53,703 INFO L263 TraceCheckSpWp]: Trace formula consists of 872 conjuncts, 234 conjunts are in the unsatisfiable core [2022-11-03 02:11:53,708 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-03 02:11:54,279 INFO L134 CoverageAnalysis]: Checked inductivity of 1777 backedges. 600 proven. 1177 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-03 02:11:54,279 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-03 02:11:56,433 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 7 treesize of output 5 [2022-11-03 02:11:56,812 INFO L134 CoverageAnalysis]: Checked inductivity of 1777 backedges. 600 proven. 1177 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-03 02:11:56,813 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [151551349] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-03 02:11:56,813 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [2141776975] [2022-11-03 02:11:56,814 INFO L159 IcfgInterpreter]: Started Sifa with 9 locations of interest [2022-11-03 02:11:56,814 INFO L166 IcfgInterpreter]: Building call graph [2022-11-03 02:11:56,815 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-03 02:11:56,815 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-03 02:11:56,815 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-03 02:11:56,844 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 8 treesize of output 7 [2022-11-03 02:11:56,869 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2022-11-03 02:11:56,896 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-11-03 02:11:57,232 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-03 02:11:59,877 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '17305#(and (<= |ULTIMATE.start_main_~length~0#1| 2147483647) (<= |ULTIMATE.start_main_~n~0#1| 2147483647) (<= |ULTIMATE.start_cmemchr_#in~s#1.offset| 0) (= |ULTIMATE.start_main_#t~malloc8#1.offset| 0) (<= |ULTIMATE.start_cmemchr_~s#1.offset| 0) (<= 0 |ULTIMATE.start_main_~nondetArea~0#1.offset|) (<= 1 |ULTIMATE.start_main_~i~0#1|) (<= 0 |ULTIMATE.start_cmemchr_#t~post3#1.offset|) (<= 0 |ULTIMATE.start_main_~nondetArea~0#1.base|) (< (select |#length| |ULTIMATE.start_cmemchr_#t~post3#1.base|) (+ |ULTIMATE.start_cmemchr_#t~post3#1.offset| 1)) (<= 0 |ULTIMATE.start_cmemchr_#t~post3#1.base|) (<= 1 |ULTIMATE.start_cmemchr_~p~0#1.offset|) (<= |ULTIMATE.start_cmemchr_~n#1| 2147483647) (<= 0 |ULTIMATE.start_cmemchr_~s#1.base|) (<= |ULTIMATE.start_main_~c~0#1| 2147483647) (<= 0 |ULTIMATE.start_main_#t~malloc8#1.base|) (<= 0 (+ |ULTIMATE.start_cmemchr_#in~c#1| 2147483648)) (<= 0 |ULTIMATE.start_cmemchr_~s#1.offset|) (<= 1 |ULTIMATE.start_main_~n~0#1|) (<= 1 |ULTIMATE.start_main_~length~0#1|) (<= |ULTIMATE.start_cmemchr_#in~c#1| 2147483647) (= |#NULL.offset| 0) (<= 0 |ULTIMATE.start_cmemchr_~p~0#1.base|) (<= |ULTIMATE.start_cmemchr_#in~n#1| 2147483647) (<= 0 (+ |ULTIMATE.start_main_~c~0#1| 2147483648)) (<= 0 (+ |ULTIMATE.start_cmemchr_~c#1| 2147483648)) (<= 0 |ULTIMATE.start_cmemchr_#in~s#1.base|) (<= |ULTIMATE.start_main_~nondetArea~0#1.offset| 0) (<= 0 |#StackHeapBarrier|) (<= 0 |ULTIMATE.start_cmemchr_#in~s#1.offset|) (<= 1 |ULTIMATE.start_cmemchr_#in~n#1|) (<= |ULTIMATE.start_cmemchr_~c#1| 2147483647) (= |#NULL.base| 0))' at error location [2022-11-03 02:11:59,877 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-03 02:11:59,878 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-03 02:11:59,878 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [54, 54, 54] total 85 [2022-11-03 02:11:59,878 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1864028869] [2022-11-03 02:11:59,881 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-03 02:11:59,881 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 87 states [2022-11-03 02:11:59,882 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-03 02:11:59,882 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 87 interpolants. [2022-11-03 02:11:59,883 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=821, Invalid=8109, Unknown=0, NotChecked=0, Total=8930 [2022-11-03 02:11:59,884 INFO L87 Difference]: Start difference. First operand 152 states and 153 transitions. Second operand has 87 states, 86 states have (on average 2.988372093023256) internal successors, (257), 86 states have internal predecessors, (257), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 02:12:05,097 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-03 02:12:05,098 INFO L93 Difference]: Finished difference Result 158 states and 159 transitions. [2022-11-03 02:12:05,098 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 81 states. [2022-11-03 02:12:05,098 INFO L78 Accepts]: Start accepts. Automaton has has 87 states, 86 states have (on average 2.988372093023256) internal successors, (257), 86 states have internal predecessors, (257), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 151 [2022-11-03 02:12:05,099 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-03 02:12:05,099 INFO L225 Difference]: With dead ends: 158 [2022-11-03 02:12:05,100 INFO L226 Difference]: Without dead ends: 158 [2022-11-03 02:12:05,101 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 559 GetRequests, 387 SyntacticMatches, 25 SemanticMatches, 147 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4411 ImplicationChecksByTransitivity, 8.6s TimeCoverageRelationStatistics Valid=3332, Invalid=18720, Unknown=0, NotChecked=0, Total=22052 [2022-11-03 02:12:05,102 INFO L413 NwaCegarLoop]: 24 mSDtfsCounter, 594 mSDsluCounter, 1474 mSDsCounter, 0 mSdLazyCounter, 4711 mSolverCounterSat, 203 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 594 SdHoareTripleChecker+Valid, 794 SdHoareTripleChecker+Invalid, 4914 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 203 IncrementalHoareTripleChecker+Valid, 4711 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 2.5s IncrementalHoareTripleChecker+Time [2022-11-03 02:12:05,102 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [594 Valid, 794 Invalid, 4914 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [203 Valid, 4711 Invalid, 0 Unknown, 0 Unchecked, 2.5s Time] [2022-11-03 02:12:05,103 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 158 states. [2022-11-03 02:12:05,105 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 158 to 156. [2022-11-03 02:12:05,105 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 156 states, 155 states have (on average 1.0129032258064516) internal successors, (157), 155 states have internal predecessors, (157), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 02:12:05,106 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 156 states to 156 states and 157 transitions. [2022-11-03 02:12:05,106 INFO L78 Accepts]: Start accepts. Automaton has 156 states and 157 transitions. Word has length 151 [2022-11-03 02:12:05,107 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-03 02:12:05,107 INFO L495 AbstractCegarLoop]: Abstraction has 156 states and 157 transitions. [2022-11-03 02:12:05,107 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 87 states, 86 states have (on average 2.988372093023256) internal successors, (257), 86 states have internal predecessors, (257), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 02:12:05,107 INFO L276 IsEmpty]: Start isEmpty. Operand 156 states and 157 transitions. [2022-11-03 02:12:05,108 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 156 [2022-11-03 02:12:05,108 INFO L187 NwaCegarLoop]: Found error trace [2022-11-03 02:12:05,108 INFO L195 NwaCegarLoop]: trace histogram [26, 25, 25, 25, 25, 25, 1, 1, 1, 1] [2022-11-03 02:12:05,145 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_81634ae4-27af-40ae-86b0-f7d8326dcf83/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (27)] Forceful destruction successful, exit code 0 [2022-11-03 02:12:05,336 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable29,27 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_81634ae4-27af-40ae-86b0-f7d8326dcf83/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-03 02:12:05,336 INFO L420 AbstractCegarLoop]: === Iteration 31 === Targeting ULTIMATE.startErr3REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 2 more)] === [2022-11-03 02:12:05,336 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-03 02:12:05,336 INFO L85 PathProgramCache]: Analyzing trace with hash 492122578, now seen corresponding path program 25 times [2022-11-03 02:12:05,336 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-03 02:12:05,337 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [577600726] [2022-11-03 02:12:05,337 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-03 02:12:05,337 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-03 02:12:05,459 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-03 02:12:08,264 INFO L134 CoverageAnalysis]: Checked inductivity of 1875 backedges. 50 proven. 1825 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-03 02:12:08,264 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-03 02:12:08,265 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [577600726] [2022-11-03 02:12:08,265 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [577600726] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-03 02:12:08,265 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [151811972] [2022-11-03 02:12:08,265 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-11-03 02:12:08,265 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-03 02:12:08,265 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_81634ae4-27af-40ae-86b0-f7d8326dcf83/bin/utaipan-7li7fVZpFI/z3 [2022-11-03 02:12:08,267 INFO L229 MonitoredProcess]: Starting monitored process 28 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_81634ae4-27af-40ae-86b0-f7d8326dcf83/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-03 02:12:08,268 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_81634ae4-27af-40ae-86b0-f7d8326dcf83/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (28)] Waiting until timeout for monitored process [2022-11-03 02:12:10,649 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-03 02:12:10,659 INFO L263 TraceCheckSpWp]: Trace formula consists of 892 conjuncts, 108 conjunts are in the unsatisfiable core [2022-11-03 02:12:10,663 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-03 02:12:11,273 INFO L134 CoverageAnalysis]: Checked inductivity of 1875 backedges. 50 proven. 1825 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-03 02:12:11,273 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-03 02:12:17,012 INFO L134 CoverageAnalysis]: Checked inductivity of 1875 backedges. 50 proven. 1825 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-03 02:12:17,012 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [151811972] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-03 02:12:17,012 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [167104388] [2022-11-03 02:12:17,014 INFO L159 IcfgInterpreter]: Started Sifa with 9 locations of interest [2022-11-03 02:12:17,014 INFO L166 IcfgInterpreter]: Building call graph [2022-11-03 02:12:17,014 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-03 02:12:17,015 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-03 02:12:17,015 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-03 02:12:17,028 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 8 treesize of output 7 [2022-11-03 02:12:17,065 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2022-11-03 02:12:17,092 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-11-03 02:12:17,508 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-03 02:12:21,259 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '18769#(and (<= |ULTIMATE.start_main_~length~0#1| 2147483647) (<= |ULTIMATE.start_main_~n~0#1| 2147483647) (<= |ULTIMATE.start_cmemchr_#in~s#1.offset| 0) (= |ULTIMATE.start_main_#t~malloc8#1.offset| 0) (<= |ULTIMATE.start_cmemchr_~s#1.offset| 0) (<= 0 |ULTIMATE.start_main_~nondetArea~0#1.offset|) (<= 1 |ULTIMATE.start_main_~i~0#1|) (<= 0 |ULTIMATE.start_cmemchr_#t~post3#1.offset|) (<= 0 |ULTIMATE.start_main_~nondetArea~0#1.base|) (< (select |#length| |ULTIMATE.start_cmemchr_#t~post3#1.base|) (+ |ULTIMATE.start_cmemchr_#t~post3#1.offset| 1)) (<= 0 |ULTIMATE.start_cmemchr_#t~post3#1.base|) (<= 1 |ULTIMATE.start_cmemchr_~p~0#1.offset|) (<= |ULTIMATE.start_cmemchr_~n#1| 2147483647) (<= 0 |ULTIMATE.start_cmemchr_~s#1.base|) (<= |ULTIMATE.start_main_~c~0#1| 2147483647) (<= 0 |ULTIMATE.start_main_#t~malloc8#1.base|) (<= 0 (+ |ULTIMATE.start_cmemchr_#in~c#1| 2147483648)) (<= 0 |ULTIMATE.start_cmemchr_~s#1.offset|) (<= 1 |ULTIMATE.start_main_~n~0#1|) (<= 1 |ULTIMATE.start_main_~length~0#1|) (<= |ULTIMATE.start_cmemchr_#in~c#1| 2147483647) (= |#NULL.offset| 0) (<= 0 |ULTIMATE.start_cmemchr_~p~0#1.base|) (<= |ULTIMATE.start_cmemchr_#in~n#1| 2147483647) (<= 0 (+ |ULTIMATE.start_main_~c~0#1| 2147483648)) (<= 0 (+ |ULTIMATE.start_cmemchr_~c#1| 2147483648)) (<= 0 |ULTIMATE.start_cmemchr_#in~s#1.base|) (<= |ULTIMATE.start_main_~nondetArea~0#1.offset| 0) (<= 0 |#StackHeapBarrier|) (<= 0 |ULTIMATE.start_cmemchr_#in~s#1.offset|) (<= 1 |ULTIMATE.start_cmemchr_#in~n#1|) (<= |ULTIMATE.start_cmemchr_~c#1| 2147483647) (= |#NULL.base| 0))' at error location [2022-11-03 02:12:21,259 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-03 02:12:21,259 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-03 02:12:21,259 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [54, 54, 54] total 109 [2022-11-03 02:12:21,260 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [436848827] [2022-11-03 02:12:21,260 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-03 02:12:21,261 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 110 states [2022-11-03 02:12:21,261 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-03 02:12:21,262 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 110 interpolants. [2022-11-03 02:12:21,263 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=307, Invalid=13499, Unknown=0, NotChecked=0, Total=13806 [2022-11-03 02:12:21,263 INFO L87 Difference]: Start difference. First operand 156 states and 157 transitions. Second operand has 110 states, 110 states have (on average 2.8363636363636364) internal successors, (312), 109 states have internal predecessors, (312), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 02:12:30,353 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-03 02:12:30,353 INFO L93 Difference]: Finished difference Result 260 states and 261 transitions. [2022-11-03 02:12:30,353 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 79 states. [2022-11-03 02:12:30,353 INFO L78 Accepts]: Start accepts. Automaton has has 110 states, 110 states have (on average 2.8363636363636364) internal successors, (312), 109 states have internal predecessors, (312), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 155 [2022-11-03 02:12:30,354 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-03 02:12:30,354 INFO L225 Difference]: With dead ends: 260 [2022-11-03 02:12:30,354 INFO L226 Difference]: Without dead ends: 159 [2022-11-03 02:12:30,355 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 567 GetRequests, 400 SyntacticMatches, 1 SemanticMatches, 166 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3686 ImplicationChecksByTransitivity, 15.6s TimeCoverageRelationStatistics Valid=610, Invalid=27446, Unknown=0, NotChecked=0, Total=28056 [2022-11-03 02:12:30,356 INFO L413 NwaCegarLoop]: 75 mSDtfsCounter, 154 mSDsluCounter, 5897 mSDsCounter, 0 mSdLazyCounter, 6465 mSolverCounterSat, 77 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 3.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 154 SdHoareTripleChecker+Valid, 5927 SdHoareTripleChecker+Invalid, 6542 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 77 IncrementalHoareTripleChecker+Valid, 6465 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 4.3s IncrementalHoareTripleChecker+Time [2022-11-03 02:12:30,356 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [154 Valid, 5927 Invalid, 6542 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [77 Valid, 6465 Invalid, 0 Unknown, 0 Unchecked, 4.3s Time] [2022-11-03 02:12:30,357 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 159 states. [2022-11-03 02:12:30,359 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 159 to 158. [2022-11-03 02:12:30,360 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 158 states, 157 states have (on average 1.0127388535031847) internal successors, (159), 157 states have internal predecessors, (159), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 02:12:30,360 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 158 states to 158 states and 159 transitions. [2022-11-03 02:12:30,360 INFO L78 Accepts]: Start accepts. Automaton has 158 states and 159 transitions. Word has length 155 [2022-11-03 02:12:30,361 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-03 02:12:30,361 INFO L495 AbstractCegarLoop]: Abstraction has 158 states and 159 transitions. [2022-11-03 02:12:30,361 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 110 states, 110 states have (on average 2.8363636363636364) internal successors, (312), 109 states have internal predecessors, (312), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 02:12:30,361 INFO L276 IsEmpty]: Start isEmpty. Operand 158 states and 159 transitions. [2022-11-03 02:12:30,362 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 158 [2022-11-03 02:12:30,362 INFO L187 NwaCegarLoop]: Found error trace [2022-11-03 02:12:30,363 INFO L195 NwaCegarLoop]: trace histogram [26, 26, 26, 25, 25, 25, 1, 1, 1, 1] [2022-11-03 02:12:30,393 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_81634ae4-27af-40ae-86b0-f7d8326dcf83/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (28)] Forceful destruction successful, exit code 0 [2022-11-03 02:12:30,569 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 28 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_81634ae4-27af-40ae-86b0-f7d8326dcf83/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable30 [2022-11-03 02:12:30,569 INFO L420 AbstractCegarLoop]: === Iteration 32 === Targeting ULTIMATE.startErr3REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 2 more)] === [2022-11-03 02:12:30,569 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-03 02:12:30,569 INFO L85 PathProgramCache]: Analyzing trace with hash 613240929, now seen corresponding path program 26 times [2022-11-03 02:12:30,569 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-03 02:12:30,569 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [975630663] [2022-11-03 02:12:30,570 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-03 02:12:30,570 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-03 02:12:30,654 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-03 02:12:34,880 INFO L134 CoverageAnalysis]: Checked inductivity of 1926 backedges. 600 proven. 1326 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-03 02:12:34,880 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-03 02:12:34,880 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [975630663] [2022-11-03 02:12:34,880 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [975630663] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-03 02:12:34,880 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [984264459] [2022-11-03 02:12:34,880 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-11-03 02:12:34,880 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-03 02:12:34,881 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_81634ae4-27af-40ae-86b0-f7d8326dcf83/bin/utaipan-7li7fVZpFI/z3 [2022-11-03 02:12:34,881 INFO L229 MonitoredProcess]: Starting monitored process 29 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_81634ae4-27af-40ae-86b0-f7d8326dcf83/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-03 02:12:34,883 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_81634ae4-27af-40ae-86b0-f7d8326dcf83/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (29)] Waiting until timeout for monitored process [2022-11-03 02:13:00,390 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 26 check-sat command(s) [2022-11-03 02:13:00,390 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-03 02:13:00,422 INFO L263 TraceCheckSpWp]: Trace formula consists of 892 conjuncts, 326 conjunts are in the unsatisfiable core [2022-11-03 02:13:00,428 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-03 02:13:00,439 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 8 treesize of output 7 [2022-11-03 02:13:12,536 INFO L134 CoverageAnalysis]: Checked inductivity of 1926 backedges. 40 proven. 1730 refuted. 0 times theorem prover too weak. 156 trivial. 0 not checked. [2022-11-03 02:13:12,537 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-03 02:13:55,965 INFO L134 CoverageAnalysis]: Checked inductivity of 1926 backedges. 0 proven. 1326 refuted. 0 times theorem prover too weak. 600 trivial. 0 not checked. [2022-11-03 02:13:55,965 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [984264459] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-03 02:13:55,966 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [393396307] [2022-11-03 02:13:55,967 INFO L159 IcfgInterpreter]: Started Sifa with 9 locations of interest [2022-11-03 02:13:55,967 INFO L166 IcfgInterpreter]: Building call graph [2022-11-03 02:13:55,968 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-03 02:13:55,968 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-03 02:13:55,968 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-03 02:13:55,999 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 8 treesize of output 7 [2022-11-03 02:13:56,033 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2022-11-03 02:13:56,067 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-11-03 02:13:56,412 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-03 02:14:03,492 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '20425#(and (<= |ULTIMATE.start_main_~length~0#1| 2147483647) (<= |ULTIMATE.start_main_~n~0#1| 2147483647) (<= |ULTIMATE.start_cmemchr_#in~s#1.offset| 0) (= |ULTIMATE.start_main_#t~malloc8#1.offset| 0) (<= |ULTIMATE.start_cmemchr_~s#1.offset| 0) (<= 0 |ULTIMATE.start_main_~nondetArea~0#1.offset|) (<= 1 |ULTIMATE.start_main_~i~0#1|) (<= 0 |ULTIMATE.start_cmemchr_#t~post3#1.offset|) (<= 0 |ULTIMATE.start_main_~nondetArea~0#1.base|) (< (select |#length| |ULTIMATE.start_cmemchr_#t~post3#1.base|) (+ |ULTIMATE.start_cmemchr_#t~post3#1.offset| 1)) (<= 0 |ULTIMATE.start_cmemchr_#t~post3#1.base|) (<= 1 |ULTIMATE.start_cmemchr_~p~0#1.offset|) (<= |ULTIMATE.start_cmemchr_~n#1| 2147483647) (<= 0 |ULTIMATE.start_cmemchr_~s#1.base|) (<= |ULTIMATE.start_main_~c~0#1| 2147483647) (<= 0 |ULTIMATE.start_main_#t~malloc8#1.base|) (<= 0 (+ |ULTIMATE.start_cmemchr_#in~c#1| 2147483648)) (<= 0 |ULTIMATE.start_cmemchr_~s#1.offset|) (<= 1 |ULTIMATE.start_main_~n~0#1|) (<= 1 |ULTIMATE.start_main_~length~0#1|) (<= |ULTIMATE.start_cmemchr_#in~c#1| 2147483647) (= |#NULL.offset| 0) (<= 0 |ULTIMATE.start_cmemchr_~p~0#1.base|) (<= |ULTIMATE.start_cmemchr_#in~n#1| 2147483647) (<= 0 (+ |ULTIMATE.start_main_~c~0#1| 2147483648)) (<= 0 (+ |ULTIMATE.start_cmemchr_~c#1| 2147483648)) (<= 0 |ULTIMATE.start_cmemchr_#in~s#1.base|) (<= |ULTIMATE.start_main_~nondetArea~0#1.offset| 0) (<= 0 |#StackHeapBarrier|) (<= 0 |ULTIMATE.start_cmemchr_#in~s#1.offset|) (<= 1 |ULTIMATE.start_cmemchr_#in~n#1|) (<= |ULTIMATE.start_cmemchr_~c#1| 2147483647) (= |#NULL.base| 0))' at error location [2022-11-03 02:14:03,492 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-03 02:14:03,493 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-03 02:14:03,493 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [56, 74, 62] total 192 [2022-11-03 02:14:03,493 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1607764801] [2022-11-03 02:14:03,493 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-03 02:14:03,494 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 194 states [2022-11-03 02:14:03,494 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-03 02:14:03,495 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 194 interpolants. [2022-11-03 02:14:03,497 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3893, Invalid=36709, Unknown=0, NotChecked=0, Total=40602 [2022-11-03 02:14:03,498 INFO L87 Difference]: Start difference. First operand 158 states and 159 transitions. Second operand has 194 states, 193 states have (on average 2.077720207253886) internal successors, (401), 193 states have internal predecessors, (401), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 02:15:09,637 WARN L234 SmtUtils]: Spent 5.11s on a formula simplification. DAG size of input: 342 DAG size of output: 264 (called from [L 360] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2022-11-03 02:18:47,775 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-03 02:18:47,775 INFO L93 Difference]: Finished difference Result 263 states and 264 transitions. [2022-11-03 02:18:47,776 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 189 states. [2022-11-03 02:18:47,776 INFO L78 Accepts]: Start accepts. Automaton has has 194 states, 193 states have (on average 2.077720207253886) internal successors, (401), 193 states have internal predecessors, (401), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 157 [2022-11-03 02:18:47,776 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-03 02:18:47,777 INFO L225 Difference]: With dead ends: 263 [2022-11-03 02:18:47,777 INFO L226 Difference]: Without dead ends: 263 [2022-11-03 02:18:47,786 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 710 GetRequests, 325 SyntacticMatches, 0 SemanticMatches, 385 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 26310 ImplicationChecksByTransitivity, 315.7s TimeCoverageRelationStatistics Valid=20812, Invalid=128570, Unknown=0, NotChecked=0, Total=149382 [2022-11-03 02:18:47,787 INFO L413 NwaCegarLoop]: 21 mSDtfsCounter, 1534 mSDsluCounter, 1915 mSDsCounter, 0 mSdLazyCounter, 11648 mSolverCounterSat, 2141 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 21.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1534 SdHoareTripleChecker+Valid, 1936 SdHoareTripleChecker+Invalid, 13789 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.1s SdHoareTripleChecker+Time, 2141 IncrementalHoareTripleChecker+Valid, 11648 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 23.3s IncrementalHoareTripleChecker+Time [2022-11-03 02:18:47,787 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [1534 Valid, 1936 Invalid, 13789 Unknown, 0 Unchecked, 0.1s Time], IncrementalHoareTripleChecker [2141 Valid, 11648 Invalid, 0 Unknown, 0 Unchecked, 23.3s Time] [2022-11-03 02:18:47,788 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 263 states. [2022-11-03 02:18:47,791 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 263 to 262. [2022-11-03 02:18:47,792 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 262 states, 261 states have (on average 1.0076628352490422) internal successors, (263), 261 states have internal predecessors, (263), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 02:18:47,793 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 262 states to 262 states and 263 transitions. [2022-11-03 02:18:47,793 INFO L78 Accepts]: Start accepts. Automaton has 262 states and 263 transitions. Word has length 157 [2022-11-03 02:18:47,794 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-03 02:18:47,794 INFO L495 AbstractCegarLoop]: Abstraction has 262 states and 263 transitions. [2022-11-03 02:18:47,794 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 194 states, 193 states have (on average 2.077720207253886) internal successors, (401), 193 states have internal predecessors, (401), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 02:18:47,795 INFO L276 IsEmpty]: Start isEmpty. Operand 262 states and 263 transitions. [2022-11-03 02:18:47,796 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 262 [2022-11-03 02:18:47,796 INFO L187 NwaCegarLoop]: Found error trace [2022-11-03 02:18:47,797 INFO L195 NwaCegarLoop]: trace histogram [52, 51, 51, 51, 26, 26, 1, 1, 1, 1] [2022-11-03 02:18:47,813 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_81634ae4-27af-40ae-86b0-f7d8326dcf83/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (29)] Forceful destruction successful, exit code 0 [2022-11-03 02:18:48,005 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 29 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_81634ae4-27af-40ae-86b0-f7d8326dcf83/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable31 [2022-11-03 02:18:48,005 INFO L420 AbstractCegarLoop]: === Iteration 33 === Targeting ULTIMATE.startErr3REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 2 more)] === [2022-11-03 02:18:48,005 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-03 02:18:48,006 INFO L85 PathProgramCache]: Analyzing trace with hash -272611775, now seen corresponding path program 27 times [2022-11-03 02:18:48,006 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-03 02:18:48,006 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1679793288] [2022-11-03 02:18:48,006 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-03 02:18:48,007 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-03 02:18:48,378 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-03 02:18:52,170 INFO L134 CoverageAnalysis]: Checked inductivity of 5878 backedges. 2652 proven. 1976 refuted. 0 times theorem prover too weak. 1250 trivial. 0 not checked. [2022-11-03 02:18:52,170 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-03 02:18:52,170 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1679793288] [2022-11-03 02:18:52,170 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1679793288] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-03 02:18:52,171 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2125123830] [2022-11-03 02:18:52,171 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-11-03 02:18:52,171 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-03 02:18:52,171 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_81634ae4-27af-40ae-86b0-f7d8326dcf83/bin/utaipan-7li7fVZpFI/z3 [2022-11-03 02:18:52,173 INFO L229 MonitoredProcess]: Starting monitored process 30 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_81634ae4-27af-40ae-86b0-f7d8326dcf83/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-03 02:18:52,174 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_81634ae4-27af-40ae-86b0-f7d8326dcf83/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (30)] Waiting until timeout for monitored process [2022-11-03 02:18:57,988 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-11-03 02:18:57,988 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-03 02:18:58,010 INFO L263 TraceCheckSpWp]: Trace formula consists of 1425 conjuncts, 490 conjunts are in the unsatisfiable core [2022-11-03 02:18:58,031 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-03 02:18:58,043 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 8 treesize of output 7 [2022-11-03 02:19:15,250 INFO L134 CoverageAnalysis]: Checked inductivity of 5878 backedges. 202 proven. 5676 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-03 02:19:15,250 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-03 02:19:42,497 INFO L134 CoverageAnalysis]: Checked inductivity of 5878 backedges. 0 proven. 5878 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-03 02:19:42,497 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2125123830] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-03 02:19:42,497 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1155248839] [2022-11-03 02:19:42,498 INFO L159 IcfgInterpreter]: Started Sifa with 9 locations of interest [2022-11-03 02:19:42,499 INFO L166 IcfgInterpreter]: Building call graph [2022-11-03 02:19:42,499 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-03 02:19:42,499 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-03 02:19:42,500 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-03 02:19:42,534 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 8 treesize of output 7 [2022-11-03 02:19:42,559 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10