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Gregory (Grisha) Trubetskoy
grisha at modpython.org
Mon Dec 29 16:54:57 EST 2003
This looks like a permissions bug with System V IPC that made it into the
beta. Try running one of the latest CVS snapshots, I think it is fixed
there.
Grisha
On Mon, 29 Dec 2003, Russell Lear wrote:
> Grisha,
>
> Thanks for the suggestions.
>
> I did a stop/start and the problem happens on the first hit.
>
> I enabled some debug logging (See below).
>
> There are two things I notice that seem odd to my inexperienced eye:
>
> 1) During apache's startup, mod_python says
> "Creating 32 session mutexes based on 150 max processes and 0 max threads".
> Is "0 max threads" correct, or do I have something misconfigured?
> Seems like max threads ought to be at least 1 or 2 ??
>
> 2) When I invoke my test, there is a warning
> "Permission denied: Failed to acquire global mutex lock at index 17".
> Is that just saying that it failed to get a mutex lock or do I have bad permissions someplace?
>
> Thanks,
> Russell.
>
> ====================
> Apache error_log exerpt:
> [... 08:30:57 ] [info] Server: Apache/2.0.48, Interface: mod_ssl/2.0.48, Library: OpenSSL/0.9.7b
> [... 08:30:57 ] [notice] suEXEC mechanism enabled (wrapper: /usr/sbin/suexec2)
> [... 08:31:00 ] [info] Init: Initializing OpenSSL library
> [... 08:31:00 ] [info] Init: Seeding PRNG with 0 bytes of entropy
> [... 08:31:00 ] [info] Init: Generating temporary RSA private keys (512/1024 bits)
> [... 08:31:00 ] [info] Init: Generating temporary DH parameters (512/1024 bits)
> [... 08:31:00 ] [info] Init: Initializing (virtual) servers for SSL
> [... 08:31:00 ] [info] Server: Apache/2.0.48, Interface: mod_ssl/2.0.48, Library: OpenSSL/0.9.7b
> [... 08:31:02 ] [notice] mod_python: Creating 32 session mutexes based on 150 max processes and 0 max threads.
> [... 08:31:02 ] [notice] Apache/2.0.48 (Linux/SuSE) mod_ssl/2.0.48 OpenSSL/0.9.7b PHP/4.3.3 mod_python/3.1.2b Python/2.3+ configured -- resuming normal operations
> [... 08:31:02 ] [info] Server built: Nov 10 2003 11:47:10
> [... 08:31:02 ] [debug] prefork.c(1037): AcceptMutex: sysvsem (default: sysvsem)
> [... 08:31:15 ] [notice] mod_python: (Re)importing module 'mptest'
> [... 08:31:16 ] [warn] (13)Permission denied: Failed to acquire global mutex lock at index 17
> [... 08:31:16 ] [error] [client ::1] PythonHandler mptest: Traceback (most recent call last):
> [... 08:31:16 ] [error] [client ::1] PythonHandler mptest:
> File "/usr/lib/python2.3/site-packages/mod_python/apache.py", line 338, in HandlerDispatch
> result = object(req)
> [... 08:31:16 ] [error] [client ::1] PythonHandler mptest:
> File "/srv/www/htdocs/test/mptest.py", line 7, in handler
> sess = Session.Session(req)
> [... 08:31:16 ] [error] [client ::1] PythonHandler mptest:
> File "/usr/lib/python2.3/site-packages/mod_python/Session.py", line 411, in Session
> timeout=timeout)
> [... 08:31:16 ] [error] [client ::1] PythonHandler mptest:
> File "/usr/lib/python2.3/site-packages/mod_python/Session.py", line 316, in __init__
> secret=secret, timeout=timeout)
> [... 08:31:16 ] [error] [client ::1] PythonHandler mptest:
> File "/usr/lib/python2.3/site-packages/mod_python/Session.py", line 170, in __init__
> self.lock() # lock new sid
> [... 08:31:16 ] [error] [client ::1] PythonHandler mptest:
> File "/usr/lib/python2.3/site-packages/mod_python/Session.py", line 241, in lock
> _apache._global_lock(self._req.server, self._sid)
> [... 08:31:16 ] [error] [client ::1] PythonHandler mptest:
> ValueError: Failed to acquire global mutex lock
>
> ====================
>
> On Sunday 28 December 2003 10:28, Gregory (Grisha) Trubetskoy wrote:
> > If you restart the server, and try this code, does the error happen on the
> > first hit, or only starting with the second and after waiting for a while?
> >
> > If if it's the former, then there probably is some problem with locking in
> > general (are there any warning messages on server startup?). ...
> >
> > Grisha
> >
> > On Sat, 27 Dec 2003, Russell Lear wrote:
> > > Hi,
> > >
> > > [RLear: 2003/12/29: deleted text to avoid overly long attachment]
> > >
> > > from mod_python import apache, Session
> > > import sys
> > >
> > > def handler(req):
> > > req.content_type = 'text/plain'
> > > req.write("Creating...\n")
> > > sess = Session.Session(req)
> > > req.write("Hello World!")
> > > return apache.OK
> > >
> > > [RLear: 2003/12/29: deleted text to avoid overly long attachment]
> > >
> > > I'm running on SuSE 9.0 Linux.
> > >
> > > Python reports version "Python 2.3+ (#1, Sep 23 2003, 23:07:16)".
> > >
> > > >From the Apache error page:
> > >
> > > Apache/2.0.48 (Linux/SuSE),
> > > mod_python/3.1.2b
> > > Python/2.3+.
> > >
> > > The only glitch I had in building mod_python was that I needed to specify
> > > ./configure --with-apxs=/usr/sbin/apxs2
> > >
> > > rather than just refering to apxs.
> > >
> > > My apache configuration is (from the tutorial):
> > > <Directory /srv/www/htdocs/test>
> > > AddHandler python-program .py
> > > PythonHandler mptest
> > > PythonDebug On
> > > </Directory>
> > >
> > >
> > >
> > > _______________________________________________
> > > Mod_python mailing list
> > > Mod_python at modpython.org
> > > http://mailman.modpython.org/mailman/listinfo/mod_python
>
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