[Python-bugs-list] [ python-Bugs-471942 ] python2.1.1 SEGV in GC on Solaris 2.7

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Bugs item #471942, was opened at 2001-10-16 19:56
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Category: Python Interpreter Core
Group: Python 2.1.1
Status: Open
Resolution: None
Priority: 5
Submitted By: Anthony Baxter (anthonybaxter)
Assigned to: Neil Schemenauer (nascheme)
Summary: python2.1.1 SEGV in GC on Solaris 2.7

Initial Comment:
I've got a Zope installation where python2.1.1 is
segfaulting on Solaris2.7 - it's running a largish 
ZEO server. The tail of the gdb output is:

 #128 0x26164 in PyEval_CallObjectWithKeywords ()
 #129 0x264c0 in PyEval_CallObjectWithKeywords ()
 #130 0x26140 in PyEval_CallObjectWithKeywords ()
 #131 0x25fc0 in PyEval_CallObjectWithKeywords ()
 #132 0x517bc in PyInstance_New ()
 #133 0x261a4 in PyEval_CallObjectWithKeywords ()
 #134 0x25fc0 in PyEval_CallObjectWithKeywords ()
 #135 0x42c90 in initgc ()

It's built with 
<anthony@devhost1>$ gcc -v
Reading specs from
/opt/local/lib/gcc-lib/sparc-sun-solaris2.7/2.95.2/specs
gcc version 2.95.2 19991024 (release)
which is a bit old. 

I'm going to rebuild with gcc3.0 and also try turning 
off the GC. Unfortunately I can't get this to happen
on a smaller test system - it's only under load that 
it plows into the ground. 

I'll also leave symbols in this time... :/


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>Comment By: Martin v. Löwis (loewis)
Date: 2001-10-17 13:44

Message:
Logged In: YES 
user_id=21627

It would be interesting what the value of "gc" is at the 
time of the crash. It looks like you got an object that 
claims to support GC but has a null tp_traverse.


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Comment By: Anthony Baxter (anthonybaxter)
Date: 2001-10-17 06:08

Message:
Logged In: YES 
user_id=29957

I'm a doofus who read the gdb trace from the wrong
end - too much python lately :)
Nonetheless, the other end of the trace failed in 
gc as well - and building without GC enabled worked.

Here's the trace with debugging enabled:

#0  0xff00 in ?? ()
#1  0x402f0 in collect (young=0x9b538, old=0x9b544) at
./Modules/gcmodule.c:379
#2  0x405a8 in collect_generations () at
./Modules/gcmodule.c:484
#3  0x40624 in _PyGC_Insert (op=0xbc1f24) at
./Modules/gcmodule.c:507
#4  0x5a224 in PyList_New (size=0) at Objects/listobject.c:61
#5  0x21bc8 in eval_code2 (co=0x1cb370, globals=0x21bc0,
locals=0x67,
    args=0x0, argcount=1, kws=0xf89b24, kwcount=0, defs=0x0,
defcount=0,
    closure=0xbc1f24) at Python/ceval.c:1741

Next trick is to rebuild without any optimisation (sigh)
as I suspect that it's inlined subtract_refs().



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