<html><head><meta http-equiv="Content-Type" content="text/html charset=utf-8"></head><body style="word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space;" class="">The cxa_demangle implementation definitely consumes stack aggressively, especially when compiled -O0. I’d definitely recommend an 8MB+ stack for any thread that may wind up demangling arbitrary C++ symbols. The new “fast demangler” is much more conservative with stack space but doesn’t yet support the full name mangling specification, so complex symbols often rely on falling back to cxa_demangle.<div class=""><br class=""><div class="">
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<br class=""><div><blockquote type="cite" class=""><div class="">On Mar 17, 2016, at 2:19 PM, Greg Clayton via lldb-dev <<a href="mailto:lldb-dev@lists.llvm.org" class="">lldb-dev@lists.llvm.org</a>> wrote:</div><br class="Apple-interchange-newline"><div class=""><div class="">Make stacks bigger when making threads on linux?<br class=""><br class=""><blockquote type="cite" class="">On Mar 17, 2016, at 1:39 PM, Jeffrey Tan via lldb-dev <<a href="mailto:lldb-dev@lists.llvm.org" class="">lldb-dev@lists.llvm.org</a>> wrote:<br class=""><br class="">Seems like the crashes happens because of abi::__cxa_demangle() for mangled symbol name " _ZNSt9_Any_data9_M_accessIPPZN5folly6fibers12FiberManager16runInMainContextIZN8facebook8memcache15CacheClientImplINS6_17CControllerCommonINS1_7dynamicEEEE11multiOpSyncINS6_11McOperationILi11EEESt6vect".<br class=""><br class="">This is blocking us from releasing our C++ debugging support. Anyone know of a quick workaround I can fix it locally? Thanks!<br class=""><br class="">On Thu, Mar 17, 2016 at 12:25 PM, via lldb-dev <<a href="mailto:lldb-dev@lists.llvm.org" class="">lldb-dev@lists.llvm.org</a>> wrote:<br class="">Bug ID<span class="Apple-tab-span" style="white-space:pre"> </span>26978<br class="">Summary<span class="Apple-tab-span" style="white-space:pre"> </span>LLDB stack overflow while dealing with symbols for a process on Linux <br class="">Product<span class="Apple-tab-span" style="white-space:pre"> </span>lldb<br class="">Version<span class="Apple-tab-span" style="white-space:pre"> </span>3.8<br class="">Hardware<span class="Apple-tab-span" style="white-space:pre"> </span>PC<br class="">OS<span class="Apple-tab-span" style="white-space:pre"> </span>Linux<br class="">Status<span class="Apple-tab-span" style="white-space:pre"> </span>NEW<br class="">Severity<span class="Apple-tab-span" style="white-space:pre"> </span>release blocker<br class="">Priority<span class="Apple-tab-span" style="white-space:pre"> </span>P<br class="">Component<span class="Apple-tab-span" style="white-space:pre"> </span>All Bugs<br class="">Assignee<span class="Apple-tab-span" style="white-space:pre"> </span><a href="mailto:lldb-dev@lists.llvm.org" class="">lldb-dev@lists.llvm.org</a><br class="">Reporter<span class="Apple-tab-span" style="white-space:pre"> </span>jeffrey.fudan@gmail.com<br class="">CC<span class="Apple-tab-span" style="white-space:pre"> </span>llvm-bugs@lists.llvm.org<br class="">Classification<span class="Apple-tab-span" style="white-space:pre"> </span>Unclassified<br class=""><br class="">While using lldb to attach a process in our company on Linux, lldb segment<br class="">fault with a huge stack(more than 30K stack frames). I assume it crashes<br class="">because of stack overflow. Let me know what additional information you needed(I<br class="">have coredump):<br class=""><br class="">#0 0x00007f28ce530819 in d_print_comp (dpi=0x7f28c2728c00, options=17,<br class="">dc=0x7f28c2724b80) at cp-demangle.c:4286<br class="">#1 0x00007f28ce5321e6 in d_print_comp (dpi=0x7f28c2728c00, options=17,<br class="">dc=0x7f28c2724bb0) at cp-demangle.c:4324<br class="">#2 0x00007f28ce5321e6 in d_print_comp (dpi=dpi@entry=0x7f28c2728c00,<br class="">options=options@entry=17, dc=0x7f28c2724c10) at cp-demangle.c:4324<br class="">#3 0x00007f28ce532010 in d_print_comp (dpi=0x7f28c2728c00, options=17,<br class="">dc=0x7f28c2724c70) at cp-demangle.c:4489<br class="">#4 0x00007f28ce5319c0 in d_print_comp (dpi=dpi@entry=0x7f28c2728c00,<br class="">options=options@entry=17, dc=0x7f28c2724c88) at cp-demangle.c:4923<br class="">#5 0x00007f28ce532056 in d_print_comp (dpi=0x7f28c2728c00, options=17,<br class="">dc=0x7f28c2724ca0) at cp-demangle.c:4493<br class="">#6 0x00007f28ce5321e6 in d_print_comp (dpi=dpi@entry=0x7f28c2728c00,<br class="">options=options@entry=17, dc=0x7f28c2724cd0) at cp-demangle.c:4324<br class="">#7 0x00007f28ce532010 in d_print_comp (dpi=0x7f28c2728c00, options=17,<br class="">dc=0x7f28c2725030) at cp-demangle.c:4489<br class="">#8 0x00007f28ce535353 in d_print_mod (dpi=dpi@entry=0x7f28c2728c00,<br class="">options=options@entry=17, mod=<optimized out>) at cp-demangle.c:5539<br class="">#9 0x00007f28ce535dbe in d_print_mod_list (dpi=dpi@entry=0x7f28c2728c00,<br class="">options=options@entry=17, mods=mods@entry=0x7f28c1f2ba30,<br class="">suffix=suffix@entry=0) at cp-demangle.c:5468<br class="">#10 0x00007f28ce5366a1 in d_print_function_type (dpi=dpi@entry=0x7f28c2728c00,<br class="">options=options@entry=17, mods=0x7f28c1f2ba30, dc=0x7f28c2725138) at<br class="">cp-demangle.c:5609<br class="">#11 0x00007f28ce53110c in d_print_comp (dpi=dpi@entry=0x7f28c2728c00,<br class="">options=options@entry=17, dc=0x7f28c2725138) at cp-demangle.c:4808<br class="">#12 0x00007f28ce530a01 in d_print_comp (dpi=0x7f28c2728c00, options=17,<br class="">dc=0x7f28c2725150) at cp-demangle.c:4434<br class="">#13 0x00007f28ce5321e6 in d_print_comp (dpi=dpi@entry=0x7f28c2728c00,<br class="">options=options@entry=17, dc=0x7f28c27251b0) at cp-demangle.c:4324<br class="">#14 0x00007f28ce5336b3 in d_print_comp (dpi=dpi@entry=0x7f28c2728c00,<br class="">options=options@entry=17, dc=0x7f28c2725108) at cp-demangle.c:4529<br class="">#15 0x00007f28ce534448 in d_print_comp (dpi=0x7f28c2728c00, options=<optimized<br class="">out>, dc=0x7f28c2725270) at cp-demangle.c:4793<br class="">#16 0x00007f28ce5319c0 in d_print_comp (dpi=dpi@entry=0x7f28c2728c00,<br class="">options=options@entry=17, dc=0x7f28c2725288) at cp-demangle.c:4923<br class="">#17 0x00007f28ce532056 in d_print_comp (dpi=0x7f28c2728c00, options=17,<br class="">dc=0x7f28c27252a0) at cp-demangle.c:4493<br class="">#18 0x00007f28ce5321e6 in d_print_comp (dpi=dpi@entry=0x7f28c2728c00,<br class="">options=options@entry=17, dc=0x7f28c27252d0) at cp-demangle.c:4324<br class="">#19 0x00007f28ce534448 in d_print_comp (dpi=dpi@entry=0x7f28c2728c00,<br class="">options=options@entry=17, dc=0x7f28c2725318) at cp-demangle.c:4793<br class="">#20 0x00007f28ce530a01 in d_print_comp (dpi=0x7f28c2728c00, options=17,<br class="">dc=0x7f28c2725330) at cp-demangle.c:4434<br class="">#21 0x00007f28ce5321e6 in d_print_comp (dpi=dpi@entry=0x7f28c2728c00,<br class="">options=options@entry=17, dc=0x7f28c2725390) at cp-demangle.c:4324<br class="">#22 0x00007f28ce53123b in d_print_comp (dpi=dpi@entry=0x7f28c2728c00,<br class="">options=options@entry=17, dc=0x7f28c27253a8) at cp-demangle.c:4742<br class="">#23 0x00007f28ce53123b in d_print_comp (dpi=dpi@entry=0x7f28c2728c00,<br class="">options=options@entry=17, dc=0x7f28c27253c0) at cp-demangle.c:4742<br class="">#24 0x00007f28ce5336b3 in d_print_comp (dpi=dpi@entry=0x7f28c2728c00,<br class="">options=options@entry=17, dc=0x7f28c2725108) at cp-demangle.c:4529<br class="">#25 0x00007f28ce53123b in d_print_comp (dpi=0x7f28c2728c00, options=17,<br class="">dc=0x7f28c27252e8) at cp-demangle.c:4742<br class="">#26 0x00007f28ce5319c0 in d_print_comp (dpi=dpi@entry=0x7f28c2728c00,<br class="">options=options@entry=17, dc=0x7f28c2725300) at cp-demangle.c:4923<br class="">#27 0x00007f28ce5366e1 in d_print_function_type (dpi=dpi@entry=0x7f28c2728c00,<br class="">options=options@entry=17, mods=0x7f28c1f2cc70, dc=0x7f28c2725318) at<br class="">cp-demangle.c:5617<br class="">#28 0x00007f28ce53110c in d_print_comp (dpi=dpi@entry=0x7f28c2728c00,<br class="">options=options@entry=17, dc=0x7f28c2725318) at cp-demangle.c:4808<br class="">#29 0x00007f28ce530a01 in d_print_comp (dpi=0x7f28c2728c00, options=17,<br class="">dc=0x7f28c2725330) at cp-demangle.c:4434<br class="">....<br class=""><br class="">#31767 0x00007f28ce5336b3 in d_print_comp (dpi=dpi@entry=0x7f28c2728c00,<br class="">options=options@entry=17, dc=0x7f28c2725108) at cp-demangle.c:4529<br class="">#31768 0x00007f28ce53123b in d_print_comp (dpi=dpi@entry=0x7f28c2728c00,<br class="">options=options@entry=17, dc=0x7f28c2725408) at cp-demangle.c:4742<br class="">#31769 0x00007f28ce534448 in d_print_comp (dpi=dpi@entry=0x7f28c2728c00,<br class="">options=options@entry=17, dc=0x7f28c2725450) at cp-demangle.c:4793<br class="">#31770 0x00007f28ce530a01 in d_print_comp (dpi=dpi@entry=0x7f28c2728c00,<br class="">options=options@entry=17, dc=dc@entry=0x7f28c2725468) at cp-demangle.c:4434<br class="">#31771 0x00007f28ce536f53 in d_demangle_callback (options=17,<br class="">opaque=0x7f28c2723cc0, callback=0x7f28ce52c820<br class=""><d_growable_string_callback_adapter>, dc=0x7f28c2725468) at cp-demangle.c:4063<br class="">#31772 0x00007f28ce536f53 in d_demangle_callback (mangled=<optimized out>,<br class=""> mangled@entry=0x0, callback=callback@entry=0x7f28ce52c820<br class=""><d_growable_string_callback_adapter>, opaque=opaque@entry=0x7f28c2728db0,<br class="">options=17) at cp-demangle.c:5865<br class="">#31773 0x00007f28ce53709f in __cxa_demangle (options=17, palc=<synthetic<br class="">pointer>, mangled=0x0) at cp-demangle.c:5886<br class=""><br class="">#31774 0x00007f28ce53709f in __cxa_demangle<br class="">(mangled_name=mangled_name@entry=0x7f28ace3d460<br class="">"_ZNSt9_Any_data9_M_accessIPPZN5folly6fibers12FiberManager16runInMainContextIZN8facebook8memcache15CacheClientImplINS6_17CControllerCommonINS1_7dynamicEEEE11multiOpSyncINS6_11McOperationILi11EEESt6vect"...,<br class="">output_buffer=output_buffer@entry=0x0, length=length@entry=0x0,<br class="">status=status@entry=0x0) at cp-demangle.c:5950<br class="">#31775 0x00007f28d015dc57 in<br class="">lldb_private::Mangled::GetDemangledName(lldb::LanguageType) const<br class="">(this=this@entry=0x7f28c0d48310,<br class="">language=language@entry=lldb::eLanguageTypeC_plus_plus)<br class=""> at<br class="">/home/engshare/third-party2/lldb/3.8.0.rc3/src/llvm/tools/lldb/source/Core/Mangled.cpp:316<br class=""><br class="">#31776 0x00007f28d025bdca in lldb_private::Symtab::InitNameIndexes()<br class="">(this=0x7f28ac1a8ff0) at<br class="">/home/engshare/third-party2/lldb/3.8.0.rc3/src/llvm/tools/lldb/source/Symbol/Symtab.cpp:334<br class="">#31777 0x00007f28d025d0b8 in<br class="">lldb_private::Symtab::FindAllSymbolsWithNameAndType(lldb_private::ConstString<br class="">const&, lldb::SymbolType, std::vector<unsigned int, std::allocator<unsigned<br class="">int> >&) (this=this@entry=0x7f28ac1a8ff0, name=...,<br class="">symbol_type=symbol_type@entry=lldb::eSymbolTypeAny, symbol_indexes=...) at<br class="">/home/engshare/third-party2/lldb/3.8.0.rc3/src/llvm/tools/lldb/source/Symbol/Symtab.cpp:819<br class=""><br class="">#31778 0x00007f28d0160ec2 in<br class="">lldb_private::Module::FindSymbolsWithNameAndType(lldb_private::ConstString<br class="">const&, lldb::SymbolType, lldb_private::SymbolContextList&)<br class="">(this=0x7f28ac0605a0, name=...,<br class="">symbol_type=symbol_type@entry=lldb::eSymbolTypeAny, sc_list=...) at<br class="">/home/engshare/third-party2/lldb/3.8.0.rc3/src/llvm/tools/lldb/source/Core/Module.cpp:1432<br class="">#31779 0x00007f28d016781d in<br class="">lldb_private::ModuleList::FindSymbolsWithNameAndType(lldb_private::ConstString<br class="">const&, lldb::SymbolType, lldb_private::SymbolContextList&, bool) const<br class="">(this=this@entry=0x7f28c27294b0, name=...,<br class="">symbol_type=symbol_type@entry=lldb::eSymbolTypeAny, sc_list=...,<br class="">append=append@entry=false) at<br class="">/home/engshare/third-party2/lldb/3.8.0.rc3/src/llvm/tools/lldb/source/Core/ModuleList.cpp:573<br class="">#31780 0x00007f28d0514626 in<br class="">JITLoaderGDB::GetSymbolAddress(lldb_private::ModuleList&,<br class="">lldb_private::ConstString const&, lldb::SymbolType) const<br class="">(this=this@entry=0x7f28ac042990, module_list=..., name=...,<br class="">symbol_type=symbol_type@entry=lldb::eSymbolTypeAny) at<br class="">/home/engshare/third-party2/lldb/3.8.0.rc3/src/llvm/tools/lldb/source/Plugins/JITLoader/GDB/JITLoaderGDB.cpp:500<br class=""><br class="">#31781 0x00007f28d05164cb in<br class="">JITLoaderGDB::SetJITBreakpoint(lldb_private::ModuleList&) (this=0x7f28ac042990,<br class="">module_list=...)<br class=""> at<br class="">/home/engshare/third-party2/lldb/3.8.0.rc3/src/llvm/tools/lldb/source/Plugins/JITLoader/GDB/JITLoaderGDB.cpp:177<br class=""><br class="">#31782 0x00007f28d030c910 in<br class="">lldb_private::JITLoaderList::ModulesDidLoad(lldb_private::ModuleList&)<br class="">(this=<optimized out>, module_list=...)<br class=""> at<br class="">/home/engshare/third-party2/lldb/3.8.0.rc3/src/llvm/tools/lldb/source/Target/JITLoaderList.cpp:76<br class="">#31783 0x00007f28d02a90f8 in<br class="">lldb_private::Process::ModulesDidLoad(lldb_private::ModuleList&)<br class="">(this=this@entry=0x894160, module_list=...)<br class=""> at<br class="">/home/engshare/third-party2/lldb/3.8.0.rc3/src/llvm/tools/lldb/source/Target/Process.cpp:6370<br class="">---Type <return> to continue, or q <return> to quit---<br class="">#31784 0x00007f28d03f3091 in<br class="">lldb_private::process_gdb_remote::ProcessGDBRemote::ModulesDidLoad(lldb_private::ModuleList&)<br class="">(this=0x894160, module_list=...)<br class=""> at<br class="">/home/engshare/third-party2/lldb/3.8.0.rc3/src/llvm/tools/lldb/source/Plugins/Process/gdb-remote/ProcessGDBRemote.cpp:4927<br class="">#31785 0x00007f28d02d3131 in<br class="">lldb_private::Target::ModulesDidLoad(lldb_private::ModuleList&) (this=0x88f8b0,<br class="">module_list=...)<br class=""> at<br class="">/home/engshare/third-party2/lldb/3.8.0.rc3/src/llvm/tools/lldb/source/Target/Target.cpp:1400<br class="">#31786 0x00007f28d02dcb58 in<br class="">lldb_private::Target::ModuleAdded(lldb_private::ModuleList const&,<br class="">std::shared_ptr<lldb_private::Module> const&) (this=0x88f8b0, module_list=...,<br class="">module_sp=...)<br class=""> at<br class="">/home/engshare/third-party2/lldb/3.8.0.rc3/src/llvm/tools/lldb/source/Target/Target.cpp:1364<br class="">#31787 0x00007f28d0168f28 in<br class="">lldb_private::ModuleList::AppendImpl(std::shared_ptr<lldb_private::Module><br class="">const&, bool) (this=0x88fbb0, module_sp=...,<br class="">use_notifier=use_notifier@entry=true)<br class=""> at<br class="">/home/engshare/third-party2/lldb/3.8.0.rc3/src/llvm/tools/lldb/source/Core/ModuleList.cpp:110<br class="">#31788 0x00007f28d0168f6a in<br class="">lldb_private::ModuleList::Append(std::shared_ptr<lldb_private::Module> const&)<br class="">(this=<optimized out>, module_sp=...)<br class=""> at<br class="">/home/engshare/third-party2/lldb/3.8.0.rc3/src/llvm/tools/lldb/source/Core/ModuleList.cpp:117<br class="">#31789 0x00007f28d02d1def in<br class="">lldb_private::Target::GetSharedModule(lldb_private::ModuleSpec const&,<br class="">lldb_private::Error*) (this=this@entry=0x88f8b0, module_spec=...,<br class="">error_ptr=error_ptr@entry=0x0)<br class=""> at<br class="">/home/engshare/third-party2/lldb/3.8.0.rc3/src/llvm/tools/lldb/source/Target/Target.cpp:1924<br class="">#31790 0x00007f28d0620b48 in<br class="">lldb_private::DynamicLoader::LoadModuleAtAddress(lldb_private::FileSpec const&,<br class="">unsigned long, unsigned long, bool) (this=<optimized out>, file=...,<br class="">link_map_addr=139710961516544, base_addr=139710941827072,<br class="">base_addr_is_offset=<optimized out>) at<br class="">/home/engshare/third-party2/lldb/3.8.0.rc3/src/llvm/tools/lldb/source/Core/DynamicLoader.cpp:192<br class="">#31791 0x00007f28d038764a in DynamicLoaderPOSIXDYLD::LoadAllCurrentModules()<br class="">(this=0x7f28ac038570)<br class=""> at<br class="">/home/engshare/third-party2/lldb/3.8.0.rc3/src/llvm/tools/lldb/source/Plugins/DynamicLoader/POSIX-DYLD/DynamicLoaderPOSIXDYLD.cpp:521<br class="">#31792 0x00007f28d03898f0 in DynamicLoaderPOSIXDYLD::DidAttach()<br class="">(this=0x7f28ac038570)<br class=""> at<br class="">/home/engshare/third-party2/lldb/3.8.0.rc3/src/llvm/tools/lldb/source/Plugins/DynamicLoader/POSIX-DYLD/DynamicLoaderPOSIXDYLD.cpp:181<br class="">#31793 0x00007f28d02a646c in lldb_private::Process::CompleteAttach()<br class="">(this=0x894160) at<br class="">/home/engshare/third-party2/lldb/3.8.0.rc3/src/llvm/tools/lldb/source/Target/Process.cpp:3443<br class="">#31794 0x00007f28d02a7236 in<br class="">lldb_private::Process::AttachCompletionHandler::PerformAction(std::shared_ptr<lldb_private::Event>&)<br class="">(this=0x8b8920, event_sp=...)<br class=""> at<br class="">/home/engshare/third-party2/lldb/3.8.0.rc3/src/llvm/tools/lldb/source/Target/Process.cpp:3194<br class="">#31795 0x00007f28d02af98c in<br class="">lldb_private::Process::HandlePrivateEvent(std::shared_ptr<lldb_private::Event>&)<br class="">(this=this@entry=0x894160, event_sp=...)<br class=""> at<br class="">/home/engshare/third-party2/lldb/3.8.0.rc3/src/llvm/tools/lldb/source/Target/Process.cpp:4184<br class="">#31796 0x00007f28d02b09bd in lldb_private::Process::RunPrivateStateThread(bool)<br class="">(this=0x894160, is_secondary_thread=<optimized out>)<br class=""> at<br class="">/home/engshare/third-party2/lldb/3.8.0.rc3/src/llvm/tools/lldb/source/Target/Process.cpp:4429<br class="">#31797 0x00007f28d0108421 in<br class="">lldb_private::HostNativeThreadBase::ThreadCreateTrampoline(void*)<br class="">(arg=0x8b8900)<br class=""> at<br class="">/home/engshare/third-party2/lldb/3.8.0.rc3/src/llvm/tools/lldb/source/Host/common/HostNativeThreadBase.cpp:81<br class="">#31798 0x00007f28cea24aa1 in start_thread () at /lib64/libpthread.so.0<br class="">#31799 0x00007f28cdd8693d in clone () at /lib64/libc.so.6<br class=""><br class=""><br class="">You are receiving this mail because:<br class=""><span class="Apple-tab-span" style="white-space:pre"> </span>• You are the assignee for the bug.<br class=""><br class="">_______________________________________________<br class="">lldb-dev mailing list<br class="">lldb-dev@lists.llvm.org<br class="">http://lists.llvm.org/cgi-bin/mailman/listinfo/lldb-dev<br class=""><br class=""><br class="">_______________________________________________<br class="">lldb-dev mailing list<br class="">lldb-dev@lists.llvm.org<br class="">http://lists.llvm.org/cgi-bin/mailman/listinfo/lldb-dev<br class=""></blockquote><br class="">_______________________________________________<br class="">lldb-dev mailing list<br class=""><a href="mailto:lldb-dev@lists.llvm.org" class="">lldb-dev@lists.llvm.org</a><br class="">http://lists.llvm.org/cgi-bin/mailman/listinfo/lldb-dev<br class=""></div></div></blockquote></div><br class=""></div></body></html>