Hi root team,
I have been experiencing a segv in our framework since
upgrading to root cvs version 2002-02-04. This segv
occurs when closing a root file from which trees have
been read.
The stack dump is appended. The segv appears in
a call to TObjectTable::Delete from TCollection::EmptyGarbageCollection
when closing the file.
I have not been able to isolate a simple example
from our code to submit as an example to this list,
but I have been able to isolate the exact lines
of code in ROOT that changed between the beginning of
2002-02-03 and 2002-02-04 to produce this problem in
our framework. The change was that two lines in
TTree::Streamer were shifted from one place to another
as shown in the commented version of TTree::Streamer
below:
void TTree::Streamer(TBuffer &b) {
if (b.IsReading()) {
UInt_t R__s,R__c;
gTree = this;
Version_t R__v = b.ReadVersion(&R__s,&R__c);
if(R__v > 4) {
// The following 2 lines were moved here from the
// location below on 2002-02-03 17:30
// This causes a new problem with segv in our framework when
// closing the file from which the trees were read.
fDirectory = gDirectory;
gDirectory -> Append(this);
TTree::Class()->ReadBuffer(b, this, R__v, R__s, R__c);
if(fEstimate <= 10000) fEstimate = 1000000;
fSavedBytes = fTotBytes;
// Former location of 2 lines of code:
// fDirectory = gDirectory;
// gDirectory -> Append(this);
return;
}
....
I can fix the segv in our framework just by shifting the
two lines back to their original position, but
I'm wondering if it makes sense that the move of these two
lines could potentially cause a problem.
I appreciate any help you can give me in sorting this out.
-Sue
p.s. I am experiencing the segv on root cvs 2002-02-04
to 2002-02-09 (today), running on intel x86 linuxegcs
platform with gcc 2.96
#0 0x413c4a01 in __kill () from /lib/i686/libc.so.6
#1 0x40f765bb in raise (sig=6) at signals.c:65
#2 0x413c5f82 in abort () at ../sysdeps/generic/abort.c:88
#3 0x40435b7f in TUnixSystem::Abort () at unix/src/TUnixSystem.cxx:1170
#4 0x40434963 in TUnixSystem::DispatchSignals (this=0x8571658,
sig=kSigSegmentationViolation) at unix/src/TUnixSystem.cxx:554
#5 0x40433871 in SigHandler (sig=kSigSegmentationViolation)
at unix/src/TUnixSystem.cxx:209
#6 0x404371af in sighandler (sig=11) at unix/src/TUnixSystem.cxx:1942
#7 0x40f768d5 in pthread_sighandler (signo=11, ctx=
{gs = 7, __gsh = 0, fs = 0, __fsh = 0, es = 43, __esh = 0, ds = 43, __dsh = 0, edi =
3221221188, esi = 142414536, ebp = 3221220264, esp = 3221220256, ebx = 1080700000, edx = 324, ecx =
142414536, eax = 0, trapno = 14, err = 6, eip = 1077884440, cs = 35, __csh = 0, eflags = 66182,
esp_at_signal = 3221220256, ss = 43, __ssh = 0, fpstate = 0xbfffe920, oldmask = 2147483648, cr2 = 324})
at signals.c:97
#8 <signal handler called>
#9 0x403f3618 in TObjectTable::Delete (this=0x87d12c8)
at cont/src/TObjectTable.cxx:199
#10 0x403eaf48 in TCollection::EmptyGarbageCollection ()
at cont/src/TCollection.cxx:396
#11 0x4039aadd in TFile::Close (this=0x86f11b0) at base/src/TFile.cxx:523
#12 0x4004c76f in PerFile::Close (this=0x86f1190, kForce=false)
at /data/minos2/kasahara/minossoft/packages/Persistency/development/PerFile.cxx:111
#13 0x4004d3f3 in PerFileManager::CloseFile (this=0x86f1178,
fullfilepathname=0xbfffecb0)
at /data/minos2/kasahara/minossoft/packages/Persistency/development/PerFileManager.cxx:76
#14 0x400564a6 in PerStream::CloseFile (this=0x86f1130)
at /data/minos2/kasahara/minossoft/packages/Persistency/development/PerStream.cxx:67
#15 0x4004ddee in PerInputStream::CloseFile (this=0x86f1130)
at /data/minos2/kasahara/minossoft/packages/Persistency/development/PerInputStream.cxx:68
#16 0x40056bdf in PerStreamManager::CloseFile (this=0xbfffee30,
streamname=0xbfffed80)
at /data/minos2/kasahara/minossoft/packages/Persistency/development/PerStreamManager.cxx:53
#17 0x40050b14 in PerInputStreamManager::CloseFile (this=0xbfffee30,
streamName=0xbfffedb0)
at /data/minos2/kasahara/minossoft/packages/Persistency/development/PerInputStreamManager.cxx:210
#18 0x40092984 in DemoInputModule::EndFile (this=0xbfffee30,
streamname=0xbfffee00)
at /data/minos2/kasahara/minossoft/packages/Persistency/development/test/DemoInputModule.cc:91
#19 0x0804ad16 in main ()
at /data/minos2/kasahara/minossoft/packages/Persistency/development/test/DemoInput.cc:64
#20 0x413b2507 in __libc_start_main (main=0x804a940 <main>, argc=1,
ubp_av=0xbfffef44, init=0x804a594 <_init>, fini=0x804c810 <_fini>,
rtld_fini=0x4000dc14 <_dl_fini>, stack_end=0xbfffef3c)
at ../sysdeps/generic/libc-start.c:129
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