[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: Nobody/Anonymous (nobody)
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: 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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