|Summary:||FC12 18.104.22.168-174.fc12.x86_64 hangs under heavy disk I/O|
|Product:||[Fedora] Fedora||Reporter:||Matteo Brancaleoni <mbrancaleoni>|
|Component:||kernel||Assignee:||Kernel Maintainer List <kernel-maint>|
|Status:||CLOSED WONTFIX||QA Contact:||Fedora Extras Quality Assurance <extras-qa>|
|Version:||12||CC:||anton, dougsland, drjones, gansalmon, itamar, kernel-maint, mishu, ngaywood|
|Fixed In Version:||Doc Type:||Bug Fix|
|Doc Text:||Story Points:||---|
Xen PV domU
|Last Closed:||2010-12-04 01:01:52 UTC||Type:||---|
|oVirt Team:||---||RHEL 7.3 requirements from Atomic Host:|
Description Matteo Brancaleoni 2009-12-31 08:36:19 UTC
Created attachment 381067 [details] FC12 traces when processes hang Description of problem: I am running an x86_64 FC12 domU PV machine under x86_64 xen host. Kernel Version is 22.214.171.124-174.fc12.x86_64. Under heavy disk I/O (the system runs koji build environment), the kernel hangs, sometimes forever (responds to ping, but no activity can be done), other times only some processes hangs. In all cases a lot of processes results into "being blocked for more than 120 seconds). Sometimes is httpd, more frequently is pdflush, kswapd and kjournald. The only cure is to hard reset the vm. Initially I was suspecting filesystem issues, so move from ext4 to ext3, but the result is the same. The domU is running over disk images (xvd block device) not on a phys device. If the machine is converted to HVM, no more issues (but is slooow). Attached kernel call traces when system hangs. Version-Release number of selected component (if applicable): domU is FC12 PV VM with kernel 126.96.36.199-174.fc12.x86_64 domO kernel version is : 2.6.18-164.9.1.el5xen dom0 (xen host) is Centos 5.4 with latest centos xen: [root@xen2 images]# xm info host : xen2 release : 2.6.18-164.9.1.el5xen version : #1 SMP Tue Dec 15 21:31:37 EST 2009 machine : x86_64 nr_cpus : 8 nr_nodes : 1 sockets_per_node : 2 cores_per_socket : 4 threads_per_core : 1 cpu_mhz : 2333 hw_caps : bfebfbff:20000800:00000000:00000140:0004e3bd:00000000:00000001 total_memory : 8189 free_memory : 38 node_to_cpu : node0:0-7 xen_major : 3 xen_minor : 1 xen_extra : .2-164.9.1.el5 xen_caps : xen-3.0-x86_64 xen-3.0-x86_32p hvm-3.0-x86_32 hvm-3.0-x86_32p hvm-3.0-x86_64 xen_pagesize : 4096 platform_params : virt_start=0xffff800000000000 xen_changeset : unavailable cc_compiler : gcc version 4.1.2 20080704 (Red Hat 4.1.2-46) cc_compile_by : mockbuild cc_compile_domain : centos.org cc_compile_date : Tue Dec 15 20:50:26 EST 2009 xend_config_format : 2 domU xen config is: name = "koji.voismart.net" uuid = "7fc52711-974d-f475-c268-e6a8f495be5d" maxmem = 3096 memory = 3096 vcpus = 4 bootloader = "/usr/bin/pygrub" on_poweroff = "destroy" on_reboot = "restart" on_crash = "restart" vfb = [ "type=vnc,vncunused=1,keymap=it" ] disk = [ "tap:aio:/var/lib/xen/images/koji.voismart.net.img,xvda,w", "tap:aio:/var/lib/xen/images/koji.voismart.net.disk2.img,xvdb,w", "tap:aio:/var/lib/xen/images/koji.voismart.net.disk3.img.img,xvdc,w" ] vif = [ "mac=00:16:36:02:ae:f1,bridge=xenbr0,script=vif-bridge" ]
Comment 3 Matteo Brancaleoni 2010-01-05 13:06:35 UTC
Created attachment 381749 [details] Same result with upcoming 188.8.131.52-1.fc12.x86_64 I've tested the kernel 184.108.40.206-1.fc12.x86_64, from fedoraproject koji. The system seems more stable (means that takes longer to hang and needs heavier I/O) but still happens. dmesg log attached.
Comment 4 Norman Gaywood 2010-02-25 02:47:35 UTC
As I mentioned before, I think I am seeing this in bug #550724 Do you have a test that can reliably produce this problem? I can't get it to happen on a test system, only my production LTSP server. This bug I sure will get more attention, I'm sure, if a reliable test case can be found.
Comment 5 Bug Zapper 2010-11-04 02:10:00 UTC
This message is a reminder that Fedora 12 is nearing its end of life. Approximately 30 (thirty) days from now Fedora will stop maintaining and issuing updates for Fedora 12. It is Fedora's policy to close all bug reports from releases that are no longer maintained. At that time this bug will be closed as WONTFIX if it remains open with a Fedora 'version' of '12'. Package Maintainer: If you wish for this bug to remain open because you plan to fix it in a currently maintained version, simply change the 'version' to a later Fedora version prior to Fedora 12's end of life. Bug Reporter: Thank you for reporting this issue and we are sorry that we may not be able to fix it before Fedora 12 is end of life. If you would still like to see this bug fixed and are able to reproduce it against a later version of Fedora please change the 'version' of this bug to the applicable version. If you are unable to change the version, please add a comment here and someone will do it for you. Although we aim to fix as many bugs as possible during every release's lifetime, sometimes those efforts are overtaken by events. Often a more recent Fedora release includes newer upstream software that fixes bugs or makes them obsolete. The process we are following is described here: http://fedoraproject.org/wiki/BugZappers/HouseKeeping
Comment 6 Bug Zapper 2010-12-04 01:01:52 UTC
Fedora 12 changed to end-of-life (EOL) status on 2010-12-02. Fedora 12 is no longer maintained, which means that it will not receive any further security or bug fix updates. As a result we are closing this bug. If you can reproduce this bug against a currently maintained version of Fedora please feel free to reopen this bug against that version. Thank you for reporting this bug and we are sorry it could not be fixed.