I'm currently trying to deploy a Django application on a server with
mod_wsgi 3.3 and python 2.7.2. The application itself runs fine with
"manage.py runserver". As soon as running it via mod_python (with
daemon processes) simple requests that do not utilize the database
(django-mongodb with pymongo 2.0.1) work fine but anything else causes
the daemon process to hang. I tried attaching "strace" and got the
following output. I first attached strace and did then request the URL
that did not work
Process 4816 attached - interrupt to quit
restart_syscall(<... resuming interrupted call ...>) = ?
ERESTART_RESTARTBLOCK (To be restarted)
--- SIGINT (Interrupt) @ 0 (0) ---
write(5, "X"..., 1) = 1
rt_sigreturn(0x1728d90) = -1 EINTR (Interrupted system
call)
poll([{fd=3, events=POLLIN}], 1, -1) = 1 ([{fd=3, revents=POLLIN}])
mmap(NULL, 2101248, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS|
MAP_32BIT, -1, 0) = 0x41bc0000
mprotect(0x41bc0000, 4096, PROT_NONE) = 0
clone(child_stack=0x41dc0210, flags=CLONE_VM|CLONE_FS|CLONE_FILES|
CLONE_SIGHAND|CLONE_THREAD|CLONE_SYSVSEM|CLONE_SETTLS|CL
futex(0x172930c, FUTEX_WAKE_OP_PRIVATE, 1, 1, 0x1729308,
{FUTEX_OP_SET, 0, FUTEX_OP_CMP_GT, 1}) = 1
futex(0x1729234, FUTEX_WAKE_OP_PRIVATE, 1, 1, 0x1729230,
{FUTEX_OP_SET, 0, FUTEX_OP_CMP_GT, 1}) = 1
futex(0x1729084, FUTEX_WAKE_OP_PRIVATE, 1, 1, 0x1729080,
{FUTEX_OP_SET, 0, FUTEX_OP_CMP_GT, 1}) = 1
futex(0x428bd9e0, FUTEX_WAIT, 4828, NULL) = ? ERESTARTSYS (To be
restarted)
--- SIGINT (Interrupt) @ 0 (0) ---
write(5, "X"..., 1) = 1
rt_sigreturn(0x1728d90) = -1 EINTR (Interrupted system
call)
futex(0x428bd9e0, FUTEX_WAIT, 4828, NULL) = ? ERESTARTSYS (To be
restarted)
--- SIGINT (Interrupt) @ 0 (0) ---
write(5, "X"..., 1) = 1
rt_sigreturn(0x1728d90) = -1 EINTR (Interrupted system
call)
futex(0x428bd9e0, FUTEX_WAIT, 4828, NULL <unfinished ...>
Process 4816 detached
The SIGINT lines keeps repeating (reduced to two outputs) and neither
the deadlock timeout nor anything else is able to kill the process.
I've been running mod_wsgi for a long time now on other servers and
never had such an issue so I'm completely baffled.
I checked the PYTHONPATH when running the application with "manage.py
runserver" and mod_wsgi and found no difference. All natives are
compiled with the correct python version (otherwise manage.py
runserver shouldn't work either). The same code runs fine on another
box with Python 2.6 and the same mod_wsgi version and it works
flawless there.
I do not know if it's a problem of mod_wsgi+pymongo problem. I'm going
to try pymongo without the C extension and will report back.
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