[Bug 569610] Re: Kernel unaligned access at TPC causing network/system to become slow and/or unresponsive
Luke J Militello, this bug was reported a while ago and there hasn't been any activity in it recently. We were wondering if this is still an issue? If so, could you please test for this with the latest development release of Ubuntu? ISO images are available from http://cdimage.ubuntu.com/daily-live/current/ . If it remains an issue, could you please run the following command in the development release from a Terminal (Applications-Accessories-Terminal), as it will automatically gather and attach updated debug information to this report: apport-collect -p linux replace-with-bug-number Also, could you please test the latest upstream kernel available following https://wiki.ubuntu.com/KernelMainlineBuilds ? It will allow additional upstream developers to examine the issue. Please do not test the daily kernel folder, but the one all the way at the bottom. Once you've tested the upstream kernel, please comment on which kernel version specifically you tested. If this bug is fixed in the mainline kernel, please add the following tags: kernel-fixed-upstream kernel-fixed-upstream-VERSION-NUMBER where VERSION-NUMBER is the version number of the kernel you tested. For example: kernel-fixed-upstream-v3.12-rc2 This can be done by clicking on the yellow circle with a black pencil icon next to the word Tags located at the bottom of the bug description. As well, please remove the tag: needs-upstream-testing If the mainline kernel does not fix this bug, please add the following tags: kernel-bug-exists-upstream kernel-bug-exists-upstream-VERSION-NUMBER As well, please remove the tag: needs-upstream-testing Once testing of the upstream kernel is complete, please mark this bug's Status as Confirmed. Please let us know your results. Thank you for your understanding. ** Changed in: linux (Ubuntu) Status: Triaged = Incomplete -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/569610 Title: Kernel unaligned access at TPC causing network/system to become slow and/or unresponsive To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/569610/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
[Bug 569610] Re: Kernel unaligned access at TPC causing network/system to become slow and/or unresponsive
Was cruising along for 10 days since my last reboot and it showed up again, however, only once and the system is still stable. [100375.580397] Kernel unaligned access at TPC[6a1504] tcp_transmit_skb+0x1ac/0x8c0 [100375.580458] Kernel unaligned access at TPC[6a150c] tcp_transmit_skb+0x1b4/0x8c0 [100375.580483] Kernel unaligned access at TPC[68e724] ip_queue_xmit+0x14c/0x5a0 [100375.580514] Kernel unaligned access at TPC[68e734] ip_queue_xmit+0x15c/0x5a0 [100375.580536] Kernel unaligned access at TPC[58e904] ip_fast_csum+0xc/0x80 -- Kernel unaligned access at TPC causing network/system to become slow and/or unresponsive https://bugs.launchpad.net/bugs/569610 You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
[Bug 569610] Re: Kernel unaligned access at TPC causing network/system to become slow and/or unresponsive
Luke, Nothing that I can think of currently. The Kernel Team may have some requests of you once they've had the opportunity to investigate this bug further. Thanks! ~JFo -- Kernel unaligned access at TPC causing network/system to become slow and/or unresponsive https://bugs.launchpad.net/bugs/569610 You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
[Bug 569610] Re: Kernel unaligned access at TPC causing network/system to become slow and/or unresponsive
Jeremy, is there anything you would like me to do in the mean time? Like test a different kernel or similar? -- Kernel unaligned access at TPC causing network/system to become slow and/or unresponsive https://bugs.launchpad.net/bugs/569610 You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
[Bug 569610] Re: Kernel unaligned access at TPC causing network/system to become slow and/or unresponsive
I did some searching and found these two entries in some kernel change logs. I have no idea if it helps any but I figured it couldn't hurt to ask... ~ ChangeLog-2.6.28 ~ 11696 commit 33cf71cee14743185305c61625c4544885055733 11697 Author: Petr Tesarik ptesa...@suse.cz 11698 Date: Fri Nov 21 16:42:58 2008 -0800 11699 11700 tcp: Do not use TSO/GSO when there is urgent data 11701 11702 This patch fixes http://bugzilla.kernel.org/show_bug.cgi?id=12014 11703 11704 Since most (if not all) implementations of TSO and even the in-kernel 11705 software GSO do not update the urgent pointer when splitting a large 11706 segment, it is necessary to turn off TSO/GSO for all outgoing traffic 11707 with the URG pointer set. 11708 11709 Looking at tcp_current_mss (and the preceding comment) I even think 11710 this was the original intention. However, this approach is insufficient, 11711 because TSO/GSO is turned off only for newly created frames, not for 11712 frames which were already pending at the arrival of a message with 11713 MSG_OOB set. These frames were created when TSO/GSO was enabled, 11714 so they may be large, and they will have the urgent pointer set 11715 in tcp_transmit_skb(). 11716 11717 With this patch, such large packets will be fragmented again before 11718 going to the transmit routine. 11719 11720 As a side note, at least the following NICs are known to screw up 11721 the urgent pointer in the TCP header when doing TSO: 11722 11723 Intel 82566MM (PCI ID 8086:1049) 11724 Intel 82566DC (PCI ID 8086:104b) 11725 Intel 82541GI (PCI ID 8086:1076) 11726 Broadcom NetXtreme II BCM5708 (PCI ID 14e4:164c) 11727 11728 Signed-off-by: Petr Tesarik ptesa...@suse.cz 11729 Signed-off-by: David S. Miller da...@davemloft.net ~ ChangeLog-2.6.29 ~ 168533 commit ef711cf1d156428d4c2911b8c86c6ce90519dc45 168534 Author: Eric Dumazet da...@cosmosbay.com 168535 Date: Fri Nov 14 00:53:54 2008 -0800 168536 168537 net: speedup dst_release() 168538 168539 During tbench/oprofile sessions, I found that dst_release() was in third position. 168540 168541 CPU: Core 2, speed 2999.68 MHz (estimated) 168542 Counted CPU_CLK_UNHALTED events (Clock cycles when not halted) with a unit mask of 0x00 (Unhalted core cycles) count 10 168543 samples %symbol name 168544 4837269.0185 __copy_user_zeroing_intel 168545 1914663.5697 __copy_user_intel 168546 1854753.4580 dst_release 168547 1751143.2648 ip_queue_xmit 168548 1534472.8608 tcp_sendmsg 168549 1087752.0280 tcp_recvmsg 168550 1026591.9140 sysenter_past_esp 168551 1014501.8914 tcp_current_mss 168552 95067 1.7724 __copy_from_user_ll 168553 86531 1.6133 tcp_transmit_skb 168554 168555 Of course, all CPUS fight on the dst_entry associated with 127.0.0.1 168556 168557 Instead of first checking the refcount value, then decrement it, 168558 we use atomic_dec_return() to help CPU to make the right memory transaction 168559 (ie getting the cache line in exclusive mode) 168560 168561 dst_release() is now at the fifth position, and tbench a litle bit faster ;) 168562 168563 CPU: Core 2, speed 3000.1 MHz (estimated) 168564 Counted CPU_CLK_UNHALTED events (Clock cycles when not halted) with a unit mask of 0x00 (Unhalted core cycles) count 10 168565 samples %symbol name 168566 6471078.8072 __copy_user_zeroing_intel 168567 2588403.5229 ip_queue_xmit 168568 2583023.5155 __copy_user_intel 168569 2096292.8531 tcp_sendmsg 168570 1656322.2543 dst_release 168571 1492322.0311 tcp_current_mss 168572 1478212.0119 tcp_recvmsg 168573 1378931.8767 sysenter_past_esp 168574 1274731.7349 __copy_from_user_ll 168575 1213081.6510 ip_finish_output 168576 1185101.6129 tcp_transmit_skb 168577 1092951.4875 tcp_v4_rcv 168578 168579 Signed-off-by: Eric Dumazet da...@cosmosbay.com 168580 Signed-off-by: David S. Miller da...@davemloft.net ** Bug watch added: Linux Kernel Bug Tracker #12014 http://bugzilla.kernel.org/show_bug.cgi?id=12014 -- Kernel unaligned access at TPC causing network/system to become slow and/or unresponsive https://bugs.launchpad.net/bugs/569610 You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
[Bug 569610] Re: Kernel unaligned access at TPC causing network/system to become slow and/or unresponsive
** Attachment added: Kernel Change Log Entries http://launchpadlibrarian.net/46867955/KernelChangeLogEntries.txt ** Changed in: linux (Ubuntu) Status: Incomplete = In Progress -- Kernel unaligned access at TPC causing network/system to become slow and/or unresponsive https://bugs.launchpad.net/bugs/569610 You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
[Bug 569610] Re: Kernel unaligned access at TPC causing network/system to become slow and/or unresponsive
Also, marking this In Progress as I do not want LP Janitor to wipe it out. I will need a bit of guidance on how to proceed seeing as I can not simply install a deb package for the upstream kernel as I am using a Sparc port. If someone could tell me which upstream version to try and where to find the proper Ubuntu source with the Ubuntu kernel config files, I have no problem compiling it and testing it out for you. -- Kernel unaligned access at TPC causing network/system to become slow and/or unresponsive https://bugs.launchpad.net/bugs/569610 You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
[Bug 569610] Re: Kernel unaligned access at TPC causing network/system to become slow and/or unresponsive
Oh and this is also a headless server install / no GUI. As for the Apport command, how shall I go about running that so I don't have to babysit the log files? I read Apport is not enabled on stable releases by default. I've never used it before either. -- Kernel unaligned access at TPC causing network/system to become slow and/or unresponsive https://bugs.launchpad.net/bugs/569610 You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
[Bug 569610] Re: Kernel unaligned access at TPC causing network/system to become slow and/or unresponsive
Hi Luke, The In Progress status is for use when a bug is assigned to a specific Kernel Team member and they are working the issue. I've set the bug to triaged. Thank you for the further data. Thanks! ~JFo ** Changed in: linux (Ubuntu) Importance: Undecided = Medium ** Changed in: linux (Ubuntu) Status: In Progress = Triaged -- Kernel unaligned access at TPC causing network/system to become slow and/or unresponsive https://bugs.launchpad.net/bugs/569610 You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
[Bug 569610] Re: Kernel unaligned access at TPC causing network/system to become slow and/or unresponsive
Thanks for the quick response, Jeremy. Unfortunately, I cannot test the latest development release image as this is a production system. However, I can test the latest upstream kernel for you. I might also add the current kernel I am running is 2.6.24-27.69. I poked around the kernel upstream site and was wondering which kernel you would like me to try. I'm guessing ... 2.6.34-999.201004261005 (daily/current) As I don't see any recent build of mainline 2.6.24.6 (2.6.24-27.69). Either way, it looks as I may have to compile it as there is no sparc64-smp deb package. Also, I have no real way to replicate this issue as it just starts appearing all of a sudden. I only caught it when my system became sluggish after a while. I'll have to watch the logs to catch it in action. When I do, shall I run the command you posted above? Thanks again. -- Kernel unaligned access at TPC causing network/system to become slow and/or unresponsive https://bugs.launchpad.net/bugs/569610 You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
[Bug 569610] Re: Kernel unaligned access at TPC causing network/system to become slow and/or unresponsive
Hi Luke, Please be sure to confirm this issue exists with the latest development release of Ubuntu. ISO CD images are available from http://cdimage.ubuntu.com/releases/ . If the issue remains, please run the following command from a Terminal (Applications-Accessories-Terminal). It will automatically gather and attach updated debug information to this report. apport-collect -p linux 569610 Also, if you could test the latest upstream kernel available that would be great. It will allow additional upstream developers to examine the issue. Refer to https://wiki.ubuntu.com/KernelMainlineBuilds . Once you've tested the upstream kernel, please remove the 'needs-upstream-testing' tag. This can be done by clicking on the yellow pencil icon next to the tag located at the bottom of the bug description and deleting the 'needs-upstream-testing' text. Please let us know your results. Thanks in advance. [This is an automated message. Apologies if it has reached you inappropriately; please just reply to this message indicating so.] ** Tags added: needs-kernel-logs ** Tags added: needs-upstream-testing ** Tags added: kj-triage ** Changed in: linux (Ubuntu) Status: New = Incomplete -- Kernel unaligned access at TPC causing network/system to become slow and/or unresponsive https://bugs.launchpad.net/bugs/569610 You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
[Bug 569610] Re: Kernel unaligned access at TPC causing network/system to become slow and/or unresponsive
** Tags added: sparc -- Kernel unaligned access at TPC causing network/system to become slow and/or unresponsive https://bugs.launchpad.net/bugs/569610 You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
