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RE: [CentOS-virt] BUG: soft lockup detected on CPU#?
by Ross S. W. Walker 23 Jan '08

23 Jan '08

Ross S. W. Walker wrote: > > Brett Worth wrote: > > > > Hello All. > > > > I've just started looking into Xen and have a test > > environment in place. I'm seeing an > > annoying problem that I thought worthy of a post. > > > > Config: > > > > I have 2 x HP DL585 servers each with 4 Dual core Opterons > > (non-vmx) and 16GB RAM > > configured as Xen servers. These run CentOS 5.1 with the > > latest updates applied. These > > system both attach to an iSCSI target which is an HP DL385 > > running ietd and serving SAN > > based storage. > > > > I have a test VM running CentOS 5.1 also updated. > > > > Problem: > > > > If I run the VM on a single server everything is OK. If I do > > a migrate of the VM to the > > other server I start getting random "BUG: soft lockup > > detected on CPU#?" messages on the > > VM console. The messages seem to happen with IO but not > > every time. A reboot of the VM > > on the new server will stop these messages. > > > > I've also left the VM running overnight a couple of times and > > when I do I find that any > > external sessions (ssh) are hung in the morning but the > > console session is not. New ssh > > sessions can be started and seem to work. > > > > After much googling it looks like the kernel messages can > > occur if dom0 is very busy but > > mine is not. > > > > Any suggestions? > > The soft lockup is technically not a BUG. > > You will see these errors if an IRQ takes more then 10 seconds > to respond. > > In your case I would take a look at your iSCSI setup and the > time it takes to migrate the VM from one node to another along > with SCSI reserve/release setup on the iSCSI target. > > I also have been using the Xen 3.2 RPMs off xen.org to CentOS > 5.1 which good results, the VM migration may run smoother and > quicker in Xen 3.2, but in doing so you take Xen off the > reservation, if your OK with that it may fix your issues. After seeing this same issue on my Xen 3.2 install, but with NO migration or iSCSI happening I decided it is probably NOT iSCSI's fault, so I decided to research it a little more and this is what I found: http://docs.xensource.com/XenServer/4.0.1/guest/ch04s08.html#rhel5_limitati… XenSource does provide a repo of CentOS 5 kernels that have been patched to fix this though: http://updates.xensource.com/XenServer/4.0.1/centos5x/ But these seem to be woefully out of date. I wonder if a kind soul would add the fix to the centosplus kernel with XenSource's patch so those rogue Xen users could benefit from this fix until upstream decides to include it. I suppose the centosplus patch would need to be flagged interm in case it needs removed when upstream has their own fix. -Ross ______________________________________________________________________ This e-mail, and any attachments thereto, is intended only for use by the addressee(s) named herein and may contain legally privileged and/or confidential information. If you are not the intended recipient of this e-mail, you are hereby notified that any dissemination, distribution or copying of this e-mail, and any attachments thereto, is strictly prohibited. If you have received this e-mail in error, please immediately notify the sender and permanently delete the original and any copy or printout thereof.

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Redhat Directory Server 8.0
by Paul 23 Jan '08

23 Jan '08

Now that RHDS 8.0 has been released any plans of rebuilding it for CentOS? Regards, Paul Berger

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XEN 3.1 centos5.1 x86_64 domU 32bit
by Theurl Michael 20 Jan '08

20 Jan '08

Hello Centos, I do not know if someone out there had/have this problems. We have two HP-bl20p-G4 2xQuadCore Xeon E5320 Intel cpu's Blade. with following software on it * centos 5.1 x86_64 * xen hypervisior 3.1 from centos distri. And run on it following guests: 32bit centos4.6 domU's with xen_domU_kernel from update repo. Some of this machines are running fine and some of this are dying sometimes under load or no load. It look's for me strange. So my question is there a basic problem to run domU32 bit systems on a 64bit hardware ? If i read the newest messages on xen this is now a big goal for xen 3.1 but i know it can be a bug or a misunderstood config on my side. Hopefully someone out there can help me with this problem. I attached some error outputs. If you need some more information's please let me know. greets Michael Here are some domU error's and core dumps: --- one of the error with an older xen domU kernel: ----------------------------------------------- kernel BUG at arch/i386/mm/hypervisor.c:195! invalid operand: 0000 [#1] SMP Modules linked in: md5(U) ipv6(U) sunrpc(U) dm_mirror(U) dm_mod(U) ext3(U) jbd(U) CPU: 0 EIP: 0061:[<c0115709>] Not tainted VLI EFLAGS: 00010282 (2.6.9-42.0.3.EL.xs0.4.0.263xenU) EIP is at xen_pgd_pin+0x44/0x52 eax: ffffffea ebx: eb500e4c ecx: 00000001 edx: 00000000 esi: 00007ff0 edi: ebb7b840 ebp: ebb7b0c0 esp: eb500e4c ds: 007b es: 007b ss: 0068 Process sh (pid: 2872, threadinfo=eb500000 task=eb712d10) Stack: 00000002 00225f7b 2b70c000 ebb7b0c0 0056e180 ebb7b0c0 c011222f ebb7b104 c01122bb ebb7b870 eb500000 c0160cf0 ebb7b840 eb712d10 c013ae9c 00000080 c016fcd9 00000080 ebb07580 00000080 ebc90840 c0157cd9 00000000 eb500000 ebbaa740 c2338c00 c0160ed9 c0160c05 eb500ec0 00000080 eb87d4c0 00400000 Call Trace: [<c011222f>] __pgd_pin+0x2a/0x3b [<c01122bb>] mm_pin+0x1f/0x2b [<c0160cf0>] exec_mmap+0xe1/0x223 [<c013ae9c>] generic_file_aio_read+0x40/0x47 [<c016fcd9>] dnotify_parent+0x1b/0x6e [<c0157cd9>] vfs_read+0xda/0xe2 [<c0160ed9>] flush_old_exec+0x43/0x21e [<c0160c05>] kernel_read+0x31/0x3b [<c017c497>] load_elf_binary+0x520/0xc83 [<c0145d99>] kmap_high +0x1e9/0x1f3 [<c0145e1b>] kunmap_high+0x78/0x95 [<c0160755>] copy_strings+0x22b/0x235 [<c017bf77>] load_elf_binary+0x0/0xc83 [<c016191c>] search_binary_handler+0xb7/0x22a [<c0161bfc>] do_execve +0x16d/0x1fd [<c0105d82>] sys_execve+0x2b/0x8a [<c02564f7>] syscall_call+0x7/0xb [<c025007b>] unix_stream_sendmsg+0x147/0x33a Code: 00 75 0d a1 a4 40 33 c0 8b 04 90 25 ff ff ff 7f 89 44 24 04 89 e3 b9 01 00 00 00 31 d2 be f0 7f 00 00 e8 3b bc fe ff 85 c0 79 08 <0f> 0b c3 00 a4 c4 26 c0 83 c4 10 5b 5e c3 56 89 c2 c1 ea 0c 53 <0>Fatal exception: panic in 5 seconds And one of the new one: ----------------------- Jan 17 13:15:22 PHOEBE kernel: ------------[ cut here ]------------ Jan 17 13:15:22 PHOEBE kernel: kernel BUG at mm/swap.c:324! Jan 17 13:15:22 PHOEBE kernel: invalid operand: 0000 [#1] Jan 17 13:15:22 PHOEBE kernel: SMP Jan 17 13:15:22 PHOEBE kernel: Modules linked in: md5 ipv6 nfs lockd nfs_acl sunrpc iptable_filter ip_tables dm_mirror dm_mod xennet ext3 jbd xenblk

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how to update install CD ?
by 董洪乾 18 Jan '08

18 Jan '08

Hello, everyone: I want to add new rpm into install cd . I have searched the answer on the net and done it like what they have said. But when I use the cd I made to install OS, It told me that " The CentOS-4 i386 CD was not found in any of your CDROM drivers. Please insert the CentOS-4 i386 cd and press OK to retry". I don't know why. Could anyone help ? The following is the step : pkgorder --product CentOS /data/CentOS/ CentOS > /data/pkgfile genhdlist --productpath=CentOS /data/OWLinux pkgorder --product CentOS /data/CentOS/ CentOS > /data/pkgfile buildinstall --pkgorder /data/pkgfile \ --version "4" \ --product "CentOS" \ --release "1" \ --prodpath CentOS /data/OWLinux mkisofs -J -R -v -T -o ./CentOS.iso -V CentOS-4 -b \ isolinux/isolinux.bin -c isolinux/boot.cat -no-emul-boot \ -boot-load-size 4 -boot-info-table ./CentOS/ Best regards ! dhongqian 2008-01-16

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Using Centos as embedded linux.
by Vishak V. Kurup 16 Jan '08

16 Jan '08

Dear all, I am newbie to Centos. I would like to know if it is possible to use centos on embedded devices. Has any one done any thing similar? Please do reply with any comments ... Regards Vishak V Kurup

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RE: [CentOS-devel] Using Centos as embedded linux.
by Vishak V. Kurup 16 Jan '08

16 Jan '08

Thank you...Daneil and John... My device configuration is as follows. CPU : intel Celeron M 1.60 Ghz DIMM : W/DDR 1GB ECC IDE(Primary Master) : Compact Flash (1 GB) IDE(Primary Master) : Compact Flash (256 GB) My confusion is that if it is possible to customize the CentOS for my application. Regards Vishak V Kurup -----Original Message----- From: centos-devel-bounces(a)centos.org [mailto:centos-devel-bounces@centos.org] On Behalf Of John Summerfield Sent: Thursday, January 10, 2008 6:22 PM To: The CentOS developers mailing list. Subject: Re: [CentOS-devel] Using Centos as embedded linux. Daniel de Kok wrote: > On 1/10/08, Vishak V. Kurup <vishak.kurup(a)nestgroup.net> wrote: >> I am newbie to Centos. I would like to know if it is possible to use centos on embedded devices. >> Has any one done any thing similar? Please do reply with any comments � > > That completely depends on the application. Currently a minimal system > is fairly large (~400-~500MB IIRC). This may be OK for some embedded > devices, and one or two orders of magnitude too large for other > embedded devices. I didn't think it was that small, unless you're talking about the amount of RAM needed to run recent anacondas:-) > > If you need something much smaller (or a non-supported platform like > ARM), I'd suggest looking at Busybox or a BSD operating system. Debian is very popular on ARM; I think I read it has more Linux system on ARM than on IA32!. The linksys wireless router, wrt54g runs Linux and there are alternative firmwares for it. Look for openwrt for info on that. -- Cheers John -- spambait 1aaaaaaa(a)coco.merseine.nu Z1aaaaaaa(a)coco.merseine.nu -- Advice http://webfoot.com/advice/email.top.php http://www.catb.org/~esr/faqs/smart-questions.html http://support.microsoft.com/kb/555375 You cannot reply off-list:-) _______________________________________________ CentOS-devel mailing list CentOS-devel(a)centos.org http://lists.centos.org/mailman/listinfo/centos-devel

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RE: [CentOS-devel] Using Centos as embedded linux.
by Vishak V. Kurup 15 Jan '08

15 Jan '08

That's also correct. But not because of the distribution I am blaming ARM. The performance got degraded very much in arm. Regards Vishak V Kurup -----Original Message----- From: centos-devel-bounces(a)centos.org [mailto:centos-devel-bounces@centos.org] On Behalf Of Lennert Buytenhek Sent: Tuesday, January 15, 2008 3:03 PM To: The CentOS developers mailing list. Subject: Re: [CentOS-devel] Using Centos as embedded linux. On Tue, Jan 15, 2008 at 09:45:00AM +0530, Vishak V. Kurup wrote: > I have worked with arm...but it is a night mare for me... > > [snip] > > ..the os I used was montavista linux ... There you have the explanation. :-) *runs* More seriously, don't blame the CPU for the shortcomings of the distro you were using. There are enough distros that run on ARM that aren't similarly crippled. _______________________________________________ CentOS-devel mailing list CentOS-devel(a)centos.org http://lists.centos.org/mailman/listinfo/centos-devel

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RE: [CentOS-devel] Using Centos as embedded linux.
by Vishak V. Kurup 15 Jan '08

15 Jan '08

I have worked with arm...but it is a night mare for me...i don't know from where all dependency problems comes...and also cross compiled libraries freely available ... were having many issues... my test machine was i686... and I had to port a gtk application in arm board ..the os I used was montavista linux ...many of may features did not work in board.. Regards Vishak V Kurup -----Original Message----- From: centos-devel-bounces(a)centos.org [mailto:centos-devel-bounces@centos.org] On Behalf Of Lennert Buytenhek Sent: Tuesday, January 15, 2008 6:17 AM To: The CentOS developers mailing list. Subject: Re: [CentOS-devel] Using Centos as embedded linux. On Thu, Jan 10, 2008 at 09:51:59PM +0900, John Summerfield wrote: > >If you need something much smaller (or a non-supported platform like > >ARM), I'd suggest looking at Busybox or a BSD operating system. > > Debian is very popular on ARM; I think I read it has more Linux system > on ARM than on IA32!. That's somewhat unlikely. :) But there _are_ probably an order of magnitude more ARM CPUs in the world than x86 CPUs. _______________________________________________ CentOS-devel mailing list CentOS-devel(a)centos.org http://lists.centos.org/mailman/listinfo/centos-devel

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CentOS-5 Cross-Build Environment (arm, mips, sparc, others..) / pre-alpha released
by Brian Schueler 15 Jan '08

15 Jan '08

Hi, folks. I've begun to work on a cross-build environment hopely to make CentOS 5 run on other architectures than supported by CentOS yet and that supported by the PNAELV. This project comes with a patch for the glibc 2.5 with added support for architectures like arm, mips, ppc, alpha, etc. to generate a cross-compile toolchain (cross-compilers, assemblers, linker/loader). It runs quite well with the Timesys 'tsrpm' tool (which is compatible with that project). Many RPMs does cross-build very well, but others fails on sanity checks, incompatible configure scripts, etc. (Kernel compilation is not included at this time.) Note that software created through that toolchain is not binary compatible to anything released by CentOS or the PNAELV. I want to switch to 'mock' and - I need a lot of help with its internals. The best enhancement were that 'mock' could recursively rebuild software entirely from source (using a yum repository that _only_ provides SRPMS). - only needing compiling natively (host-arch = target-arch). And there are many things to discuss at one event (glibc, cross-compiling, Kernels, automated RPM cross-(re)build machinery, repository management, yum-bootstapping, etc.) IMPORTANT: This is my first version - so please consider my project as unstable/pre-alpha. My wish is to make this project work as desired to bring CentOS to many more architectures and hopely to make it part of the CentOS project. This is leaned to Cross Linux From Scratch and is licensed under the terms of the GNU GPL v2. The tree is located at: http://dbl76.tfh-berlin.de/~s18009/c5/cross reviews, improvements, suggestions, bug reports are very welcome. - BriSch

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RE: [CentOS-devel] Using Centos as embedded linux.
by Vishak V. Kurup 15 Jan '08

15 Jan '08

Thank you all for the enormous suggestions and information's ... I think I can go forward with the customization. Many suggested using Debian instead of CentOS... Why I prefer CentOS is that CentOS is more stable than Debian or any other editions... and there will be less dependency problems (I think so) Regards Vishak V Kurup -----Original Message----- From: centos-devel-bounces(a)centos.org [mailto:centos-devel-bounces@centos.org] On Behalf Of John Summerfield Sent: Saturday, January 12, 2008 4:43 AM To: The CentOS developers mailing list. Subject: Re: [CentOS-devel] Using Centos as embedded linux. Ing. Ernesto Pérez Estévez wrote: > > I have been thinking to slim centos by recompiling every RPM without the > docs and several other tricks to make it less fatter.. of course it wont > be the real centos but some sort of reduced copy. rpm supports omitting docs. You might need to fiddle anaconda or yum to choose the right way. > > BTW, I found that debian was easier to install in such a hardware That's my thinking. -- Cheers John -- spambait 1aaaaaaa(a)coco.merseine.nu Z1aaaaaaa(a)coco.merseine.nu -- Advice http://webfoot.com/advice/email.top.php http://www.catb.org/~esr/faqs/smart-questions.html http://support.microsoft.com/kb/555375 You cannot reply off-list:-) _______________________________________________ CentOS-devel mailing list CentOS-devel(a)centos.org http://lists.centos.org/mailman/listinfo/centos-devel

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