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CONFIG_RTC_SYSTOHC not set for CentOS kernels
by Anand Buddhdev 15 Nov '18

15 Nov '18

Hi folks, RHEL 7 documentation says that if either ntp or chrony is running on a system, then it will enable the kernel feature to sync system time to the hardware clock every 11 minutes. This needs the CONFIG_RTC_SYSTOHC option to be set. However, it looks like this option is not set for CentOS kernels: # fgrep CONFIG_RTC_SYSTOHC /boot/config-3.10.0-862.14.4.el7.x86_64 # CONFIG_RTC_SYSTOHC is not set This explains why on some of our servers, the hardware clock is out of sync with the system time. Does anyone know why this option is not enabled for CentOS kernels? Regards, Anand

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'date' format differences between CentOS 6 and 7 using the en_GB locale ?
by James Pearson 15 Nov '18

15 Nov '18

Just noticed that the output of 'date' is different between CentOS 6 and 7 when using the 'en_GB' locale - e.g.: CentOS 6: % LANG=en_GB date Thu Nov 15 11:42:46 GMT 2018 % LANG=en_US date Thu Nov 15 11:42:56 GMT 2018 CentOS 7: % LANG=en_GB date Thu 15 Nov 11:43:07 GMT 2018 % LANG=en_US date Thu Nov 15 11:43:11 GMT 2018 i.e. with LANG=en_GB on CentOS 7, the day and month are swapped when compared with CentOS 6 Any one know why the en_GB locale has changed between CentOS 6 and 7 ? Thanks James Pearson

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CentOS Dojo @ FOSDEM
by Rich Bowen 14 Nov '18

14 Nov '18

We're delighted to announce the schedule, and registration, for the upcoming CentOS Dojo in Brussels, on February 1, 2019, the day before FOSDEM starts. Details are here: https://wiki.centos.org/Events/Dojo/Brussels2019 The schedule is still marked "Tentative" since I have not received confirmation from all of the speakers yet, but we're almost there. Registration is FREE, but we do ask that you register anyways, since it helps us with venue planning and catering. See you in Brussels! -- Rich Bowen - rbowen(a)redhat.com http://centos.org/ - @CentOSProject 859 351 9166

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merging signatures to a pdf file
by Gregory P. Ennis 13 Nov '18

13 Nov '18

Everyone, I am working on a module with the use of pdktk that merges *.fdf data files with a *.pdf file for a filled out pdf form. I have the need to add a signature to the pdf form. Do any of you know of a way to make this happen? Thanks much!!! Greg Ennis

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error creating output file /var/lib/logrotate/logrotate.status.tmp: File exists
by Carlos Lopez 13 Nov '18

13 Nov '18

Hi all, I have configured a specific logrotate task to rotate certain logs every hour and everytime this logrotate's task runs, I am receiving an email like this: Auto-Submitted: auto-generated Precedence: bulk X-Cron-Env: <LANG=en_US.UTF-8> X-Cron-Env: <LC_ALL=en_US.UTF-8> X-Cron-Env: <XDG_SESSION_ID=4502> X-Cron-Env: <XDG_RUNTIME_DIR=/run/user/0> X-Cron-Env: <SHELL=/bin/sh> X-Cron-Env: <HOME=/root> X-Cron-Env: <PATH=/usr/bin:/bin> X-Cron-Env: <LOGNAME=root> X-Cron-Env: <USER=root> Date: Tue, 13 Nov 2018 11:00:04 +0000 (UTC) Status: R error: error creating output file /var/lib/logrotate/logrotate.status.tmp: File exists In Redhat's bugzilla I have seen some reported bugs with the same behavior and apparently is solved with an update. But this CentOS 7 host is fully patched and error persists ... Any idea? Regards, C. L. Martinez

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Firefox Video Capability
by Chris Olson 13 Nov '18

13 Nov '18

One of our summer interns has stayed on during the school year to work some weekends on special projects. This past weekend, her assignment was to trouble shoot problems with Firefox when trying to view various on-line training videos. At some web sites, the video associated with the page will not play and we get the messages shown below. The Download statement is actually a link and was used to download this rpm file: adobe-release-x86_64-1.0-1.noarch.rpm. "Cannot Play Video" "The latest version of Adobe Flash is required to play this video." "Download the free Flash player here." The intern did not install this rpm because doing so outside of yum did not seem like a good idea. We also do not really know how the Adobe Flash utility is called up by Firefox and whether or not the installation would solve the problem or possibly cause other problems. This problem is not happening on our Windows 7 machines, but not everyone here has a Microsoft machine to use. On Windows, the Firefox occasionally updates itself when launched so that might explain the difference. The training videos always do play on Windows 7 systems when the web pages are brought up. We also noticed that on Windows 7 there are no Firefox related processes remaining after closing all Firefox browsers. This is not the case on our CentOS 6 systems as indicated in the output below. Is this video viewing issue a common problem, and if it is, can someone provide some direction to correct it. Thanks. ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ [user@computer ~]$ ps -elf | grep firefox 0 S user 3872 1 0 80 0 - 68607 poll_s Nov08 ? 00:00:00 /usr/lib64/firefox/bundled/libexec/at-spi-bus-launcher 0 S user 8178 8149 0 80 0 - 25832 pipe_w 19:42 pts/2 00:00:00 grep firefox [user@computer ~]$

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[infra outage] : unexpected DC issue
by Fabian Arrotin 13 Nov '18

13 Nov '18

Due to a DC outage where some nodes are hosted, the following (public) services provided by the CentOS Infra are currently down/unreachable : - https://bugs.centos.org - https://fr.centos.org After contact with the DC, they're trying to restore services as fast as possible, but seems related to power outage. More info when services will be back online, or that we'll have received status update. -- Fabian Arrotin The CentOS Project | https://www.centos.org gpg key: 56BEC54E | twitter: @arrfab

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centos 7.5 crashed, kernel BUG at net/core/skbuff.c:3668!
by wuzhouhui 13 Nov '18

13 Nov '18

... [ 176.025679] random: crng init done [ 411.168635] netem: version 1.3 [ 456.059840] ------------[ cut here ]------------ [ 456.059849] WARNING: CPU: 4 PID: 1918 at net/ipv4/tcp_output.c:1048 tcp_set_skb_tso_segs+0xeb/0x100 [ 456.059851] Modules linked in: sch_netem cirrus ttm drm_kms_helper crc32_pclmul syscopyarea ghash_clmulni_intel sysfillrect sysimgblt fb_sys_fops aesni_intel lrw ppdev gf128mul drm glue_helper ablk_helper cryptd parport_pc parport i2c_piix4 virtio_balloon i2c_core joydev pcspkr ip_tables ext4 mbcache jbd2 ata_generic pata_acpi ata_piix virtio_console virtio_net virtio_blk floppy crct10dif_pclmul virtio_pci crct10dif_common libata serio_raw virtio_ring crc32c_intel virtio [ 456.059886] CPU: 4 PID: 1918 Comm: sshd Kdump: loaded Not tainted 3.10.0-862.14.4.el7.x86_64 #1 [ 456.059887] Hardware name: Red Hat KVM, BIOS 0.5.1 01/01/2007 [ 456.059890] Call Trace: [ 456.059896] [<ffffffffae913754>] dump_stack+0x19/0x1b [ 456.059901] [<ffffffffae2945d8>] __warn+0xd8/0x100 [ 456.059905] [<ffffffffae29471d>] warn_slowpath_null+0x1d/0x20 [ 456.059908] [<ffffffffae8535eb>] tcp_set_skb_tso_segs+0xeb/0x100 [ 456.059911] [<ffffffffae853637>] tcp_init_tso_segs+0x37/0x50 [ 456.059915] [<ffffffffae8552c1>] tcp_write_xmit+0x1f1/0xd00 [ 456.059918] [<ffffffffae85604e>] __tcp_push_pending_frames+0x2e/0xc0 [ 456.059922] [<ffffffffae8442fc>] tcp_push+0xec/0x120 [ 456.059925] [<ffffffffae847ce2>] tcp_sendmsg+0xd2/0xc80 [ 456.059930] [<ffffffffae8739b9>] inet_sendmsg+0x69/0xb0 [ 456.059935] [<ffffffffae7d084d>] sock_aio_write+0x15d/0x180 [ 456.059940] [<ffffffffae434c11>] ? set_fd_set+0x21/0x30 [ 456.059944] [<ffffffffae41e763>] do_sync_write+0x93/0xe0 [ 456.059948] [<ffffffffae41f345>] vfs_write+0x1c5/0x1f0 [ 456.059953] [<ffffffffae2fc0f0>] ? get_monotonic_boottime+0x50/0x100 [ 456.059956] [<ffffffffae42006f>] SyS_write+0x7f/0xf0 [ 456.059961] [<ffffffffae92579b>] system_call_fastpath+0x22/0x27 [ 456.059963] ---[ end trace 77e1915bd237f005 ]--- [ 728.963668] ------------[ cut here ]------------ [ 728.964320] kernel BUG at net/core/skbuff.c:3668! [ 728.964933] invalid opcode: 0000 [#1] SMP [ 728.965501] Modules linked in: sch_netem cirrus ttm drm_kms_helper crc32_pclmul syscopyarea ghash_clmulni_intel sysfillrect sysimgblt fb_sys_fops aesni_intel lrw ppdev gf128mul drm glue_helper ablk_helper cryptd parport_pc parport i2c_piix4 virtio_balloon i2c_core joydev pcspkr ip_tables ext4 mbcache jbd2 ata_generic pata_acpi ata_piix virtio_console virtio_net virtio_blk floppy crct10dif_pclmul virtio_pci crct10dif_common libata serio_raw virtio_ring crc32c_intel virtio [ 728.971540] CPU: 3 PID: 0 Comm: swapper/3 Kdump: loaded Tainted: G W ------------ 3.10.0-862.14.4.el7.x86_64 #1 [ 728.972981] Hardware name: Red Hat KVM, BIOS 0.5.1 01/01/2007 [ 728.973723] task: ffff94153bb1cf10 ti: ffff94153bb30000 task.ti: ffff94153bb30000 [ 728.974689] RIP: 0010:[<ffffffffae7df554>] [<ffffffffae7df554>] __skb_to_sgvec+0x1e4/0x280 [ 728.975792] RSP: 0018:ffff941655183cf8 EFLAGS: 00010202 [ 728.976494] RAX: ffff94163c68c700 RBX: 00000000000005a8 RCX: ffff941648bd4ac0 [ 728.977407] RDX: 0000000000000001 RSI: 00000000000005a8 RDI: 00000000000002c0 [ 728.978322] RBP: ffff941655183d38 R08: ffff941653416cf8 R09: fffffe544a34ae00 [ 728.979241] R10: ffff941648bd4800 R11: 000000000000000a R12: 00000000000005ea [ 728.980160] R13: 00000000000005ea R14: 0000000000000000 R15: 0000000000000002 [ 728.981076] FS: 0000000000000000(0000) GS:ffff941655180000(0000) knlGS:0000000000000000 [ 728.982109] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 728.982849] CR2: 00007f7ed4008000 CR3: 0000000289e1a000 CR4: 00000000001406e0 [ 728.983778] Call Trace: [ 728.984107] <IRQ> [ 728.984368] [<ffffffffae7df612>] skb_to_sgvec+0x12/0x30 [ 728.985098] [<ffffffffc00fa4bf>] start_xmit+0x19f/0x500 [virtio_net] [ 728.985925] [<ffffffffae7f02e6>] dev_hard_start_xmit+0x246/0x3b0 [ 728.986741] [<ffffffffae81bc0a>] sch_direct_xmit+0x11a/0x250 [ 728.987489] [<ffffffffae81bdce>] __qdisc_run+0x8e/0x360 [ 728.988182] [<ffffffffae7ef3e6>] net_tx_action+0x1d6/0x240 [ 728.988924] [<ffffffffae29dba5>] __do_softirq+0xf5/0x280 [ 728.989634] [<ffffffffae928cec>] call_softirq+0x1c/0x30 [ 728.990322] [<ffffffffae22e625>] do_softirq+0x65/0xa0 [ 728.990994] [<ffffffffae29df25>] irq_exit+0x105/0x110 [ 728.991680] [<ffffffffae92a088>] smp_apic_timer_interrupt+0x48/0x60 [ 728.992504] [<ffffffffae9267b2>] apic_timer_interrupt+0x162/0x170 [ 728.993298] <EOI> [ 728.993566] [<ffffffffae91ad90>] ? __cpuidle_text_start+0x8/0x8 [ 728.994377] [<ffffffffae91af96>] ? native_safe_halt+0x6/0x10 [ 728.995161] [<ffffffffae91adae>] default_idle+0x1e/0xc0 [ 728.995869] [<ffffffffae2366e3>] arch_cpu_idle+0x23/0xb0 [ 728.996568] [<ffffffffae2f5dea>] cpu_startup_entry+0x14a/0x1e0 [ 728.997330] [<ffffffffae2571b7>] start_secondary+0x1f7/0x270 [ 728.998077] [<ffffffffae2000d5>] start_cpu+0x5/0x14 [ 728.998721] Code: 89 45 c8 e8 3f fe ff ff 44 8b 4d d0 41 01 c7 44 29 cb 74 41 44 8b 55 c4 4c 8b 45 c8 45 01 cd 4d 8b 36 4d 85 f6 75 90 85 db 74 2a <0f> 0b 66 2e 0f 1f 84 00 00 00 00 00 48 c7 c7 00 00 00 80 48 2b [ 729.003191] RIP [<ffffffffae7df554>] __skb_to_sgvec+0x1e4/0x280 [ 729.005068] RSP <ffff941655183cf8> Any advice?

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Drop/Terminate data to/from source using firewalld rich rules
by Mike 12 Nov '18

12 Nov '18

I need to be able to temporarily cut off the source of network slowdowns. What I used to do: Router with 2 x NICs running slackware 14. Execute iptraf-ng, choose IP Network Monitor and sort by Byte Count. The sorted screen always seemed a bit confusing but I could usually pluck a couple of IP addresses with racing byte counts and cut all traffic to them using an iptables rule. Then if I wanted to identify the computer or device, I’d go into the dhcpd.leases file and look for the ip address and the corresponding device hostname. It was a bit of a pain, but it worked. Now: Router with 2 x NIC’s running CentOS 7. Using systemd and firewalld with 2 zones: external (internet-facing) and internal (LAN-facing). Now when I try the same thing using firewall-cmd rich rules, it won’t work. Example: [root@hello ~]# firewall-cmd --zone=external --list-rich-rules rule family="ipv4" source address="10.10.1.73/24" drop rule family="ipv4" source address="40.97.126.210" drop rule family="ipv4" source address="10.10.1.73/32" drop rule family="ipv4" source address="40.97.126.210/32" drop and [root@hello ~]# firewall-cmd --zone=internal --list-rich-rules rule family="ipv4" source address="10.10.1.73/24" drop rule family="ipv4" source address="40.97.126.210" drop rule family="ipv4" source address="10.10.1.73/32" drop It didn’t work. The traffic continued to burst away for another hour before stopping. The address (40.97.126.210) belongs to Microsoft so I’m not concerned about publishing it. What am I doing wrong with firewalld rich rules and how do I properly drop/terminate traffic to/from a specific source on the LAN? Current command - ADD rich rule to drop any traffic in zone "internal" from source ip address 10.10.1.125: firewall-cmd --permanent --zone=internal --add-rich-rule='rule family=ipv4 source address=10.10.1.125/24 drop' firewall-cmd --reload REMOVE the same rich rule above: firewall-cmd --permanent --zone=internal --remove-rich-rule='rule family=ipv4 source address=10.10.1.125/24 drop' firewall-cmd --reload Thank you for reading.

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off-topic question about RDP to Win-10
by Fred Smith 12 Nov '18

12 Nov '18

I have a win10 VM in virtualbox on my Linux (C7) desktop. I CAN connect to it with rdesktop 1.8.3 (now rather old, but it's the latest release), but cannot connect with remmina or krdc. Both of them just hang for a while then say they can't connect. Curiously, they all will connect to the win10 box in my office. They don't show any other useful information, and I don't know where to go to figure this out. Anyone out there have any ideas they can share? thanks in advance! Fred -- ------------------------------------------------------------------------------- .---- Fred Smith / ( /__ ,__. __ __ / __ : / / / / /__) / / /__) .+' Home: fredex(a)fcshome.stoneham.ma.us / / (__ (___ (__(_ (___ / :__ 781-438-5471 -------------------------------- Jude 1:24,25 ---------------------------------

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