Discuss February 2016

discuss@lists.centos.org

126 participants
103 discussions

Update on Kernel panic executing gkrellm.
by Lamar Owen 16 Feb '16

16 Feb '16

For what it's worth, back in April of last year I reported that gkrellm had started generating kernel panics with 7.1503's kernel. I can now report that with the latest 7.1511 kernels (327.4.5 being the latest I have installed) gkrellm is once again behaving for me. Just wanted to close the loop and say that whatever had broken has been fixed, for my hardware.

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How to install packages from git.centos.org
by Tim 16 Feb '16

16 Feb '16

Hi all, how can I install rpms from git.centos.org? I'd like to install and test the realtime-kernel. It seems to me that https://wiki.centos.org/Sources only means to build srpms. What I ned is an rt-kernel with headers for further compiling. Purpose: I'd like to build a digital audio workstation and for this I'd like to try out CentOS with the following packages first: - kernel-rt - ardour - calf-plugins BTW: Is there an audio SIG? Thanks in advance Tim

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USB Serial ports (ttyACMn) CentOS 6.7 (64-bit) vs. CentOS 6.7 (64-bit)
by Robert Heller 16 Feb '16

16 Feb '16

I have two computers: both running CentOS 6.7, 64-bit, with kernel 2.6.32-573.12.1.el6.x86_64. One is a laptop with an 2 core Intel processor and the other is a desktop machine with a 4 core AMD processor. Both with selinux enabled. I have a USB serial port device (a RR-CirKits LCC-Buffer USB). On the desktop I am getting this error: sauron.deepsoft.com% sudo minicom Device /dev/ttyACM0 access failed: No such file or directory. sauron.deepsoft.com% dir -lZ /dev/ttyACM0 crw-rw----. root dialout system_u:object_r:tty_device_t:s0 /dev/ttyACM0 But it is working on the laptop! gollum.deepsoft.com% dir -lZ /dev/ttyACM1 crw-rw----. root dialout system_u:object_r:tty_device_t:s0 /dev/ttyACM1 Same kernel, same device (except it is showing up as ttyACM1 on the laptop). What is going on here? -- Robert Heller -- 978-544-6933 Deepwoods Software -- Custom Software Services http://www.deepsoft.com/ -- Linux Administration Services heller(a)deepsoft.com -- Webhosting Services

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rpm containing gmessage???
by ken 16 Feb '16

16 Feb '16

Maybe I haven't run the correct yum commands or looked in the right repo, but I haven't found a utility called 'gmessage'. Anyone know where to find it?

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Re: [CentOS] USB Serial ports (ttyACMn) CentOS 6.7 (64-bit) vs. CentOS 6.7 (64-bit)
by Robert Heller 15 Feb '16

15 Feb '16

At Sun, 14 Feb 2016 19:20:48 -0500 Robert Heller <heller(a)deepsoft.com> wrote: > > At Mon, 15 Feb 2016 09:41:32 +1100 CentOS mailing list <centos(a)centos.org> wrote: > > > > > On 14/02/16 02:14, Robert Heller wrote: > > > I sent this out about a week or so ago, but I have heard nothing. I am > > > *thinking* it is a SELINUX problem, but I cannot figure out what. > > > > > > > If you suspect SELinux is to blame, have you tried putting SELinux into > > permissive mode to see that resolves the issues? > > > > setenforce 0 (re-enable with setenforce 1) > > I guess I can try that. > > > > > If everything works with SELinux in permissive mode, then you'll need to > > create a policy for it *[0]*. > > That would imply that somehow the policies on my laptop are *different* than > the policies on my desktop. *I* don't remember setting any such policies... OK, I just tested it: sauron.deepsoft.com% sudo /usr/sbin/setenforce permissive sauron.deepsoft.com% sudo minicom Device /dev/ttyACM0 access failed: No such file or directory. sauron.deepsoft.com% sudo /usr/sbin/setenforce enforcing Nope, that did not help. > > > > > > > ak. > > > > *[0]*: > > https://wiki.centos.org/HowTos/SELinux#head-faa96b3fdd922004cdb988c1989e561… > > > > > > _______________________________________________ > > CentOS mailing list > > CentOS(a)centos.org > > https://lists.centos.org/mailman/listinfo/centos > > > > > -- Robert Heller -- 978-544-6933 Deepwoods Software -- Custom Software Services http://www.deepsoft.com/ -- Linux Administration Services heller(a)deepsoft.com -- Webhosting Services

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safest way to mount iscsi loopback..
by lejeczek 15 Feb '16

15 Feb '16

.. what is? fellow centosians. how to you mount your loopback targets? I'm trying lvm backstore, I was hoping I would do it with uuid, but it's exposed more than once and how would kernel decide which device to use I don't know. thanks

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abrt-watch-log -F BUG: WARNING: at WARNING: CPU: INFO: possible recursive locking detected
by Michael H 15 Feb '16

15 Feb '16

Hi All, I've been tuning a server recently and just today this has started to appear in my top/htop output. [root@db1 ~]# ps -aux | grep kernel root 1011 0.0 0.0 212048 4532 ? Ss 13:34 0:00 /usr/bin/abrt-watch-log -F BUG: WARNING: at WARNING: CPU: INFO: possible recursive locking detected ernel BUG at list_del corruption list_add corruption do_IRQ: stack overflow: ear stack overflow (cur: eneral protection fault nable to handle kernel ouble fault: RTNL: assertion failed eek! page_mapcount(page) went negative! adness at NETDEV WATCHDOG ysctl table check failed : nobody cared IRQ handler type mismatch Machine Check Exception: Machine check events logged divide error: bounds: coprocessor segment overrun: invalid TSS: segment not present: invalid opcode: alignment check: stack segment: fpu exception: simd exception: iret exception: /var/log/messages -- /usr/bin/abrt-dump-oops -xtD I had made a few changes to sysctl.conf which I have now reverted and the error still exists. my sysctl.conf contained; vm.swappiness=0 vm.overcommit_memory=2 vm.overcommit_ratio=90 - this was only added this morning because of an 'out of memory' error in postgresql. kernel.shmmax=35433480192 kernel.shmall=2214592512 which I have now removed. Can anyone shine any light on this? A little search on Google mentions faulty memory, I will install memtest today and see what the output is like. Thanks Michael

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A repo with latest httpd for http2?
by SternData 13 Feb '16

13 Feb '16

Is there a well-run package repo that has httpd-2.4.17 or mod_http2 (or mod_h2)? I'd like to try out http2 without having to compile my own httpd. -- -- Steve

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ananconda update.img creation fails: generated but with wrong python version in /usr/sbin/anaconda contained
by David Copperfield 11 Feb '16

11 Feb '16

Hi all, I've created an anaconda update.img file per instructions at https://fedoraproject.org/wiki/Anaconda/Updates for Centos 7.2. The problem is that the update.img file contains references to python3 (say, file /usr/sbin/anaconda), and so the all installation fails immediately. My question is: what are the steps to create an anaconda update image appropriate for a particular centos release? Thanks a lot. The steps I have performed (to create an update.img) are listed below: 1) find the version of ananconda that centos 7.2 installation media: 21.48.22.56-1. 2) follow the instructions at the above wiki page, and wiki https://fedoraproject.org/wiki/Anaconda. Run the following command (to generate update.img): 2.1 yum -y install git 2.2 git clone https://fedoraproject.org/wiki/Anaconda 2.3 cd anaconda 2.4 scripts/makeupdates -t anaconda-21.48.22.56-1 3) save the generated image to place under .../images directory. >From what I see, all PXE clients did download the new update.img file and merge the changes contained. But because the updated anaconda pointed to python3 instead of python 2.7.5 (the version comes with installation media), the installation process failed immediately. Thanks. Best,David

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OpenSwan Drop Out Issue
by John Cenile 11 Feb '16

11 Feb '16

Hello, I'm cross posting this from the OpenSwan mailing list, in case someone here can help. We have two sites connected via OpenSwan 2.6.32-9 on CentOS 5, sharing 6 /24 subnets each (so 12 in total). The problem we're having is completely randomly, be it in the middle of the day, or in the middle of the night (so I don't believe it's traffic related), certain (and sometimes all) routes will drop. They usually recover after a few minutes, but it's still long enough for our monitoring to detect downtime. The configuration we have on each device is: conn site-a keyingtries=0 keylife=1h ikelifetime=8h left=1.1.1.1 right=2.2.2.2 leftsubnets={x.x.x.x/24,x.x.x.x/24,x.x.x.x/24,x.x.x.x/24,x.x.x.x/24,x.x.x.x/24} rightsubnets={x.x.x.x/24,x.x.x.x/24,x.x.x.x/24,x.x.x.x/24,x.x.x.x/24,x.x.x.x/24} pfs=yes auto=start authby=secret dpddelay=30 dpdtimeout=120 dpdaction=hold phase2alg=aes256-sha1;modp1536 phase2=esp ike=aes256-sha1;modp1536 It's mirrored exactly the same on the other side. I have tried changing the dead peer detection timeout to something high (5 minutes), and removing it completely (which I believe defaults it to 30 seconds), neither of which made any difference. I can't see any very obvious errors in the logs, however the most recent drop out produced the following message around the same time: Feb 10 00:53:09 site-b-vpn pluto[30584]: "site-a/5x5" #39: max number of retransmissions (2) reached STATE_QUICK_I1 Feb 10 00:53:09 site-b-vpn pluto[30584]: "site-a/5x5" #39: starting keying attempt 2 of an unlimited number Feb 10 00:53:09 site-b-vpn pluto[30584]: "site-a/5x5" #95: initiating Quick Mode PSK+ENCRYPT+TUNNEL+PFS+UP+IKEv2ALLOW+SAREFTRACK to replace #39 {using isakmp#52 msgid:119495de proposal=AES(12)_256-SHA1(2)_160 pfsgroup=OAKLEY_GROUP_MODP1536} and also Feb 10 00:52:25 site-a-vpn pluto[2414]: "site-b/6x6" #1: ignoring Delete SA payload: PROTO_IPSEC_ESP SA(0xde58eea3) not found (maybe expired) Feb 10 00:52:25 site-a-vpn pluto[2414]: "site-b/6x6" #1: received and ignored informational message Feb 10 00:52:25 site-a-vpn pluto[2414]: "site-b/6x6" #1: ignoring Delete SA payload: PROTO_IPSEC_ESP SA(0xa5298d7d) not found (maybe expired) Feb 10 00:52:25 site-a-vpn pluto[2414]: "site-b/6x6" #1: received and ignored informational message Before we move to another solution, does anyone have any suggestions on what the problem might be? Running a constant ping between the two hosts doesn't drop *any* packets (even when the IPSec connection itself drops out). Thanks in advance.

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Discuss February 2016