Date: Tue, 20 Nov 2007 20:13:01 -0800 From: Jin Guojun <jin@george.lbl.gov> To: Kip Macy <kip.macy@gmail.com> Cc: freebsd-bugs@freebsd.org, kmacy@freebsd.org Subject: Re: kern/37436: [hang] accept dead loop when out of file descriptors Message-ID: <4743B04D.8030305@george.lbl.gov> In-Reply-To: <b1fa29170711161837k71bbf1e5w9a8efaa400f46ced@mail.gmail.com> References: <200711170119.lAH1Jokl048803@freefall.freebsd.org> <473E451C.8090103@george.lbl.gov> <b1fa29170711161837k71bbf1e5w9a8efaa400f46ced@mail.gmail.com>
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Kip Macy wrote: >On Nov 16, 2007 5:34 PM, Jin Guojun <jin@george.lbl.gov> wrote: > > >>kmacy@FreeBSD.org wrote: >> >> >> >>>Synopsis: [hang] accept dead loop when out of file descriptors >>> >>>State-Changed-From-To: open->feedback >>>State-Changed-By: kmacy >>>State-Changed-When: Sat Nov 17 01:19:37 UTC 2007 >>>State-Changed-Why: >>> >>>Is this still an issue? >>> >>>http://www.freebsd.org/cgi/query-pr.cgi?pr=37436 >>> >>> >>> >>> >>I will check into it in a week. >> >> > >By "still", I mean RELENG_6 or better yet RELENG_7. > > -Kip > > Another slightly odd thing is discovered during repeat this test. The maximum number of threads (pthread_create via libthr) can be created is 111. Therefore, there is no way to reproduce this problem due to pthread_create problem. The pthread_create() fails due to Error<35> Resource temporarily unavailable. However, memory allocation is still functioning. I have tested on a 256MB laptop and a 1GB desktop, both had the same problem for pthread creation -- maximum 111 threads can be created. Below is my resource limits and I do not believe that is the problem: /home/users/libthr: limit cputime unlimited filesize unlimited datasize 1048028 kbytes stacksize 65536 kbytes coredumpsize unlimited memoryuse unlimited vmemoryuse unlimited descriptors 11095 memorylocked unlimited maxproc 5547 sbsize unlimited It looks like 6.2-R and RELENG_6/7 kernel has some restriction on number of threads to handle, because all libthr, libpthread and libc_r all behave the same. Is this true? So, that only test can be done is to set descriptors limit to 117 on the server to test 111 connections from a client. Such test is Ok. If the descriptors limit is set to 116, the accept will return error without hanging. But I do not know if this will be true when the number of descriptors used is larger. I tried to run the same command multiple times on the same client, it does not help much. I will look this issue further. -Jin
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