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    SubjectRe: [Bug #12465] KVM guests stalling on 2.6.28 (bisected) [Bug 12465]
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    On Sat, 2009-02-14 at 21:50 +0100, Rafael J. Wysocki wrote:
    > This message has been generated automatically as a part of a report
    > of regressions introduced between 2.6.27 and 2.6.28.
    >
    > The following bug entry is on the current list of known regressions
    > introduced between 2.6.27 and 2.6.28. Please verify if it still should
    > be listed and let me know (either way).

    Yes, this should still be listed.

    I just tested against 2.6.29-rc5 and the problem is as bad as ever
    (perhaps worse?)

    --- hermes-old.wumi.org.au ping statistics ---
    900 packets transmitted, 448 received, +317 errors, 50% packet loss, time 899845ms
    rtt min/avg/max/mdev = 0.131/420.015/10890.699/1297.022 ms, pipe 11

    The guest being pinged crashed during the test - the QEMU monitor was
    accessible, but the guest didn't respond to "sendkey alt-sysrq-s", etc.
    This was the last thing in the guest syslog after reboot:

    Feb 15 19:48:58 hermes-old kernel: ------------[ cut here ]------------
    Feb 15 19:48:58 hermes-old kernel: WARNING: at net/sched/sch_generic.c:219 dev_watchdog+0x111/0x195()
    Feb 15 19:48:58 hermes-old kernel: NETDEV WATCHDOG: eth0 (8139too): transmit timed out
    Feb 15 19:48:58 hermes-old kernel: Pid: 0, comm: swapper Not tainted 2.6.27.10 #1
    Feb 15 19:48:58 hermes-old kernel: [<c011d75c>] warn_slowpath+0x5c/0x81
    Feb 15 19:48:58 hermes-old kernel: [<c02f5f7c>] nf_hook_slow+0x44/0xb1
    Feb 15 19:48:58 hermes-old kernel: [<c02d93f1>] dev_queue_xmit+0x3da/0x411
    Feb 15 19:48:58 hermes-old kernel: [<c030043d>] ip_finish_output+0x1f9/0x231
    Feb 15 19:48:58 hermes-old kernel: [<c01daeee>] __next_cpu+0x12/0x21
    Feb 15 19:48:58 hermes-old kernel: [<c0116b42>] find_busiest_group+0x232/0x69f
    Feb 15 19:48:58 hermes-old kernel: [<c01160dc>] update_curr+0x41/0x65
    Feb 15 19:48:58 hermes-old kernel: [<c02e33b5>] dev_watchdog+0x111/0x195
    Feb 15 19:48:58 hermes-old kernel: [<c011822f>] enqueue_task_fair+0x16/0x24
    Feb 15 19:48:58 hermes-old kernel: [<c0115645>] enqueue_task+0xa/0x14
    Feb 15 19:48:58 hermes-old kernel: [<c01156d5>] activate_task+0x16/0x1b
    Feb 15 19:48:58 hermes-old kernel: [<c0119c8c>] try_to_wake_up+0x131/0x13a
    Feb 15 19:48:58 hermes-old kernel: [<c02e32a4>] dev_watchdog+0x0/0x195
    Feb 15 19:48:58 hermes-old kernel: [<c012424c>] run_timer_softirq+0xf5/0x14a
    Feb 15 19:48:58 hermes-old kernel: [<c0120f60>] __do_softirq+0x5d/0xc1
    Feb 15 19:48:58 hermes-old kernel: [<c0120ff6>] do_softirq+0x32/0x36
    Feb 15 19:48:58 hermes-old kernel: [<c012112c>] irq_exit+0x35/0x40
    Feb 15 19:48:58 hermes-old kernel: [<c010e8db>] smp_apic_timer_interrupt+0x6e/0x7b
    Feb 15 19:48:58 hermes-old kernel: [<c01035ac>] apic_timer_interrupt+0x28/0x30
    Feb 15 19:48:58 hermes-old kernel: [<c0107386>] default_idle+0x2a/0x3d
    Feb 15 19:48:58 hermes-old kernel: [<c0101900>] cpu_idle+0x5c/0x84
    Feb 15 19:48:58 hermes-old kernel: =======================
    Feb 15 19:48:58 hermes-old kernel: ---[ end trace eff10a8043ac4e7b ]---
    Feb 15 19:49:01 hermes-old kernel: eth0: Transmit timeout, status 0d 0000 c07f media d0.
    Feb 15 19:49:01 hermes-old kernel: eth0: Tx queue start entry 839 dirty entry 839.
    Feb 15 19:49:01 hermes-old kernel: eth0: Tx descriptor 0 is 0008a03c.
    Feb 15 19:49:01 hermes-old kernel: eth0: Tx descriptor 1 is 0008a062.
    Feb 15 19:49:01 hermes-old kernel: eth0: Tx descriptor 2 is 0008a062.
    Feb 15 19:49:01 hermes-old kernel: eth0: Tx descriptor 3 is 0008a05b. (queue head)
    Feb 15 19:49:01 hermes-old kernel: eth0: link up, 100Mbps, full-duplex, lpa 0x05E1

    I think I saw some patches to fix the latency tracer for non-RT tasks on
    the mailing list a while ago. If that's still going to be a useful test,
    can someone give me some hints on which kernel tree and/or patches to
    download to get that working? The simpler you can make it, the better ;)

    Cheers,
    Kevin.




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