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SubjectRe: fork: Resource temporarily unavailable / cant start new threads
mark wrote:
> On Wed, May 21, 2008 at 1:28 PM, Randy Dunlap <randy.dunlap@oracle.com> wrote:
>> On Tue, 20 May 2008 11:26:47 -0700 mark wrote:
>>> I upgraded to 2.6.25.3-18.fc9.x86_64 fedora core 9, now I get this
>>> error when I try to login to the box, kill a pr start a python app, or
>>> do anything on a regular basis.
>>>
>>> fork: Resource temporarily unavailable
>>>
>>> I have over 10GB RAM free, and zero swap spaced used. The box is a
>>> dual quad core Intel Xeon 5405 with 16GB RAM.
>>>
>>> There is no error message in /var/log/messages or dmesg ...
>>> how do I identify the problem?
>>> thanks!
>>>
>>> uname -a
>>> Linux XXX 2.6.25.3-18.fc9.x86_64 #1 SMP Tue May 13 04:54:47 EDT 2008
>>> x86_64 x86_64 x86_64 GNU/Linux
>>>
>>>
>>> free -m
>>> total used free shared buffers cached
>>> Mem: 16086 3189 12896 0 42 666
>>> -/+ buffers/cache: 2481 13605
>>> Swap: 1983 0 1983
>>>
>>>
>>> have only 505 processes running
>>> ps aux | wc -l
>>> 505
>>>
>>>
>>> uptime
>>> 11:24:15 up 39 min, 1 user, load average: 3.54, 3.47, 2.87
>>>
>>> ulimit -a
>>> core file size (blocks, -c) 0
>>> data seg size (kbytes, -d) unlimited
>>> scheduling priority (-e) 0
>>> file size (blocks, -f) unlimited
>>> pending signals (-i) 137216
>>> max locked memory (kbytes, -l) 32
>>> max memory size (kbytes, -m) unlimited
>>> open files (-n) 32768
>>> pipe size (512 bytes, -p) 8
>>> POSIX message queues (bytes, -q) 819200
>>> real-time priority (-r) 0
>>> stack size (kbytes, -s) 10240
>>> cpu time (seconds, -t) unlimited
>>> max user processes (-u) 1024
>>> virtual memory (kbytes, -v) unlimited
>>> file locks (-x) unlimited
>> The only place that fork() returns EAGAIN is for number of
>> processes being >= its limit. Does this user already have >= 1024
>> processes?
>
> No, it is around 400

Well, my comment was wrong anyway. There are several other tests just
below number of user processes that also return EAGAIN, like:

- total number of threads being too large
- error on grabbing a module reference count (?)
- error on grabbing a binfmt module reference


> ps ax | wc -l
> 417
>
> I also I increased max process to unlimited, and I still get the error
> randomly..
>
> ulimit -u
> unlimited
>
> my webserver is now throwing this error:
>
> setuid(500) failed (11: Resource temporarily unavailable)

That's all of the useful information??

>
> cat /etc/passwd | grep mark
> mark:x:500:500::/home/mark:/bin/bash
>
> I also increased this, but still the same error
> kernel.pid_max = 65536


--
~Randy


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