Details
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Type:
Bug
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Status: Closed (View Workflow)
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Priority:
High
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Resolution: Fixed
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Affects Version/s: 6.08/00
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Component/s: Cling, Core Libraries, Dictionaries
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Labels:None
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Environment:
Bug present with GCC 6.2 (ubuntu 16.10).
Doesn't affect ROOT 6.06 with GCC 4.9.
Description
Dear experts,
I'm trying to write a custom class into a tree branch. A dictionary for the class is generated using the cmake macro `ROOT_GENERATE_DICTIONARY`. The compilation goes on fine, but the call to ´TTree::Branch` causes a warning followed by a segfault. Removing the call to `TTree::Branch` I still get a warning but no segfault.
I've included a small example isolating the bug (to be built with cmake).
Yours,
Sébastien
This is the warning followed by the stacktrace:
Warning in <TClassTable::Add>: class hit already in TClassTable
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Warning in <TClassTable::Add>: class event already in TClassTable
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*** Break *** segmentation violation
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===========================================================
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There was a crash.
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This is the entire stack trace of all threads:
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===========================================================
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#0 0x00007fd3f666448a in __GI___waitpid (pid=15576, stat_loc=stat_loc
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entry=0x7ffd9cf06dc0, options=options
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entry=0) at ../sysdeps/unix/sysv/linux/waitpid.c:29
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#1 0x00007fd3f65dd2fb in do_system (line=<optimized out>) at ../sysdeps/posix/system.c:148
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#2 0x00007fd3f79e10a9 in TUnixSystem::Exec (shellcmd=<optimized out>, this=0x55c8a6c934f0) at /home/swertz/.local/soft/root/core/unix/src/TUnixSystem.cxx:2116
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#3 TUnixSystem::StackTrace (this=0x55c8a6c934f0) at /home/swertz/.local/soft/root/core/unix/src/TUnixSystem.cxx:2403
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#4 0x00007fd3f79e3a5c in TUnixSystem::DispatchSignals (this=0x55c8a6c934f0, sig=kSigSegmentationViolation) at /home/swertz/.local/soft/root/core/unix/src/TUnixSystem.cxx:3661
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#5 <signal handler called>
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#6 strlen () at ../sysdeps/x86_64/strlen.S:106
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#7 0x00007fd3f208f20c in std::char_traits<char>::length (__s=0x7fd3eb5bf370 <error: Cannot access memory at address 0x7fd3eb5bf370>) at /usr/include/c++/6/bits/char_traits.h:267
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#8 std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> >::append (__s=0x7fd3eb5bf370 <error: Cannot access memory at address 0x7fd3eb5bf370>, this=0x7ffd9cf096d0) at /usr/include/c++/6/bits/basic_string.h:1113
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#9 std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> >::operator+= (__s=0x7fd3eb5bf370 <error: Cannot access memory at address 0x7fd3eb5bf370>, this=0x7ffd9cf096d0) at /usr/include/c++/6/bits/basic_string.h:1037
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#10 ExecAutoParse (what=0x7fd3eb5bf370 <error: Cannot access memory at address 0x7fd3eb5bf370>, header=header
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entry=false, interpreter=0x55c8a6cfa0a0) at /home/swertz/.local/soft/root/core/meta/src/TCling.cxx:5324
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#11 0x00007fd3f20937ab in TCling::AutoParseImplRecurse (this=this
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entry=0x55c8a6cf32f0, cls=<optimized out>, cls
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entry=0x7ffd9cf09a40 "event", topLevel=topLevel
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entry=true) at /home/swertz/.local/soft/root/core/meta/src/TCling.cxx:5445
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#12 0x00007fd3f2093e82 in TCling::AutoParse (this=0x55c8a6cf32f0, cls=0x7ffd9cf09a40 "event") at /home/swertz/.local/soft/root/core/meta/src/TCling.cxx:5523
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#13 0x00007fd3f207fe3a in TClingLookupHelper__AutoParse (cname=<optimized out>) at /home/swertz/.local/soft/root/core/meta/src/TCling.cxx:909
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#14 0x00007fd3f2073f87 in ROOT::TMetaUtils::TClingLookupHelper::GetPartiallyDesugaredNameWithScopeHandling (this=0x55c8a6df4fd0, tname="event", result="") at /home/swertz/.local/soft/root/core/metautils/src/TMetaUtils.cxx:552
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#15 0x00007fd3f79813b3 in ResolveTypedefProcessType (tname=tname
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entry=0x55c8a790df10 "event", cursor=5, constprefix=constprefix
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entry=false, start_of_type=start_of_type
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entry=0, end_of_type=end_of_type
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entry=0, mod_start_of_type=mod_start_of_type
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entry=0, modified=
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0x7ffd9cf09e4b: false, result="", this=<optimized out>, this=<optimized out>, this=<optimized out>) at /home/swertz/.local/soft/root/core/metautils/src/TClassEdit.cxx:1366
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#16 0x00007fd3f7982a2b in ResolveTypedefImpl (tname=tname
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entry=0x55c8a790df10 "event", len=<optimized out>, cursor=
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0x7ffd9cf09e4c: 5, cursor
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entry=
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0x7ffd9cf09e4c: 0, modified=modified
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entry=
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0x7ffd9cf09e4b: false, result="") at /home/swertz/.local/soft/root/core/metautils/src/TClassEdit.cxx:1641
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#17 0x00007fd3f7983744 in TClassEdit::ResolveTypedef[abi:cxx11](char const*, bool) (tname=0x55c8a790df10 "event") at /home/swertz/.local/soft/root/core/metautils/src/TClassEdit.cxx:1671
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#18 0x00007fd3f7986dbd in TClassEdit::TSplitType::ShortType (this=this
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entry=0x7ffd9cf09f70, answ="", mode=3618, mode
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entry=3616) at /home/swertz/.local/soft/root/core/metautils/src/TClassEdit.cxx:390
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#19 0x00007fd3f7985bb0 in TClassEdit::GetNormalizedName (norm_name="", name=...) at /home/swertz/.local/soft/root/core/metautils/src/TClassEdit.cxx:794
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#20 0x00007fd3f7998413 in TClass::GetClass (name=name
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entry=0x55c8a78b63d0 "event", load=load
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entry=true, silent=silent
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entry=true) at /home/swertz/.local/soft/root/core/meta/src/TClass.cxx:2944
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#21 0x00007fd3f208165c in TCling::GetClass (this=<optimized out>, typeinfo=..., load=<optimized out>) at /home/swertz/.local/soft/root/core/meta/src/TCling.cxx:5169
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#22 0x00007fd3f7990259 in TClass::GetClass (typeinfo=..., load=<optimized out>) at /home/swertz/.local/soft/root/core/meta/src/TClass.cxx:3127
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#23 0x000055c8a4bf5257 in TBranch* TTree::Branch<event>(char const*, event*, int, int) ()
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#24 0x000055c8a4bf4faf in main ()
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===========================================================
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