Asking advice on a Zope "stuck" (or: what did I do wrong?)

[Marco Bizzarri]

Hi all.

While using ab to perform stress tests on an application, I've run in
a situation where I have a "locked" Zope.

I installed DeadlockDebugger, and tried to have a dump from it, but it
is unable to answer, at leasts it seems to me.

So, I followed the recipe from ZopeLabs:

http://www.zopelabs.com/cookbook/1073504990

and got a traceback from gdb.

info threads gives the following:

* 5 Thread 0xb5b29b90 (LWP 17713)  0xffffe410 in __kernel_vsyscall ()
  4 Thread 0xb5322b90 (LWP 17714)  0xffffe410 in __kernel_vsyscall ()
  3 Thread 0xb4b21b90 (LWP 17715)  0xffffe410 in __kernel_vsyscall ()
  2 Thread 0xb4320b90 (LWP 17716)  0xffffe410 in __kernel_vsyscall ()
  1 Thread 0xb7d4b8c0 (LWP 17687)  0xffffe410 in __kernel_vsyscall ()


I'm including the traceback. As you can see, the last lines tell (for
all the threads) are:


  File "/var/local/zope28/base288/lib/python/Shared/DC/ZRDB/Results.py",
line 55, in __init__
    if n != name: aliases.append((n, SQLAlias(name)))
  File "<string>", line 1, in ?


Just one note: environment is Linux, Zope 2.8.8, python2.3

I understand Zope+python is quite old, so I'm just asking if there is
some "general" purpose advice on what to do in this case.

Regards
Marco

--
Marco Bizzarri
http://iliveinpisa.blogspot.com/


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[Dieter Maurer]

Marco Bizzarri wrote at 2008-8-2 09:33 +0200:

> ....
>I installed DeadlockDebugger, and tried to have a dump from it, but it
>is unable to answer, at leasts it seems to me.
>
>So, I followed the recipe from ZopeLabs:
>
>http://www.zopelabs.com/cookbook/1073504990
>
>and got a traceback from gdb.
>
>info threads gives the following:
>
>* 5 Thread 0xb5b29b90 (LWP 17713)  0xffffe410 in __kernel_vsyscall ()
>  4 Thread 0xb5322b90 (LWP 17714)  0xffffe410 in __kernel_vsyscall ()
>  3 Thread 0xb4b21b90 (LWP 17715)  0xffffe410 in __kernel_vsyscall ()
>  2 Thread 0xb4320b90 (LWP 17716)  0xffffe410 in __kernel_vsyscall ()
>  1 Thread 0xb7d4b8c0 (LWP 17687)  0xffffe410 in __kernel_vsyscall ()
>
>
>I'm including the traceback. As you can see, the last lines tell (for
>all the threads) are:
>
>
>  File "/var/local/zope28/base288/lib/python/Shared/DC/ZRDB/Results.py",
>line 55, in __init__
>    if n != name: aliases.append((n, SQLAlias(name)))

This is unbelievable.

The above Python code should not block (and not cause an infinite
recursion) other than for memory requests.

At C-level, you see to be in a kernel call.
Look closer at the C level tracebacks to find out which kernel
call this is.

You may need to have a Python with debug symbols to get reliable
C level tracebacks.



--
Dieter
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