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xen-devel
RE: [Xen-devel] [xen-unstable test] 1959: FAIL [and 1 more messages]
I think its safer to explicitly stop the timer. Might there also be a race
with a pending timer when setting up the new one on reconnect?
J
"Ian Campbell" <Ian.Campbell@xxxxxxxxxxxxx> wrote:
>On Fri, 2010-07-30 at 05:58 +0100, Xu, Dongxiao wrote:
>> Hi Ian,
>>
>> Can you try this patch to see if it fixes your problem?
>>
>> I tried it on my local machine, VM is pinging another host.
>> After save/restore/migration, the ping is still ongoing.
>>
>> Thanks,
>> Dongxiao
>>
>>
>> From: Dongxiao Xu <dongxiao.xu@xxxxxxxxx>
>>
>> When saving guest, the shared ring will be set to NULL, and
>> in this case the polling timer interrupt should stop.
>>
>> Thanks Ian J for reporting the problem.
>>
>> Signed-off-by: Dongxiao Xu <dongxiao.xu@xxxxxxxxx>
>> ---
>> drivers/net/xen-netfront.c | 4 ++++
>> 1 files changed, 4 insertions(+), 0 deletions(-)
>>
>> diff --git a/drivers/net/xen-netfront.c b/drivers/net/xen-netfront.c
>> index 328fe40..394bbc8 100644
>> --- a/drivers/net/xen-netfront.c
>> +++ b/drivers/net/xen-netfront.c
>> @@ -1340,6 +1340,10 @@ static enum hrtimer_restart
>> smart_poll_function(struct hrtimer *timer)
>> np = netdev_priv(dev);
>>
>> spin_lock_irqsave(&np->tx_lock, flags);
>> +
>> + if (!np->rx.sring)
>> + goto end;
>> +
>
>Isn't there a period until the end of xennet_disconnect_backend is
>reached on resume where rx.sring will still point to the old shared
>ring? If so is it safe to drop through in that case?
>
>Would it be safer to add an explicit suspend handler which stopped the
>timer?
>
>Ian.
>
>> np->smart_poll.counter++;xennet_disconnect_backend
>>
>> if (likely(netif_carrier_ok(dev))) {
>> --
>> 1.6.3
>>
>>
>>
>> Jeremy Fitzhardinge wrote:
>> > On 07/29/2010 09:33 AM, Ian Jackson wrote:
>> >> Jeremy Fitzhardinge writes ("Re: [Xen-devel] [xen-unstable test]
>> >> 1959: FAIL [and 1 more messages]"):
>> >>> On 07/29/2010 08:30 AM, Ian Jackson wrote:
>> >>>> Is save/restore supposed to work in pvops ? (Using your kernel for
>> >>>> both dom0 and domU.) That would seem to be the next thing to pick
>> >>>> off the list ...
>> >>> Yes. IanC has been tracking down a bug where it fails after a few
>> >>> thousand iterations (now fixed?), but aside from that its
>> >>> apparently OK.
>> >> Well, I was able to reproduce the failure that the automatic test was
>> >> getting. There's a problem with it not getting a copy of the console
>> >> output for some reason but I was able to get this oops from the
>> >> guest.
>> >>
>> >> Just after the restore I was able to connect to the PV console and it
>> >> echoed a few of my CRs (before saving I had logged in on the
>> >> console),
>> >> and then it produced the oops. Now it's apparently completely
>> >> wedged.
>> >>
>> >
>> > Ah, it looks like the netfront smartpoll stuff isn't coping with
>> > save/restore.
>> >
>> > J
>> >
>> >> Ian.
>> >>
>> >>
>> >>
>> >> [ 63.681260] BUG: unable to handle kernel NULL pointer dereference
>> >> at 00000010 [ 63.681293] IP: [<c1300381>]
>> >> smart_poll_function+0xbb/0xf2 [ 63.681320] *pdpt =
>> >> 000000001fee5027 *pde = 0000000000000000 [ 63.681344] Oops: 0000
>> >> [#1] SMP [ 63.681362] last sysfs file: /sys/kernel/uevent_seqnum
>> >> [ 63.681376] Modules linked in: [last unloaded: scsi_wait_scan] [
>> >> 63.681398] [ 63.681410] Pid: 5, comm: events/0 Not tainted
>> >> (2.6.32.16 #1) [ 63.681424] EIP: 0061:[<c1300381>] EFLAGS:
>> >> 00010002 CPU: 0 [ 63.681438] EIP is at
>> >> smart_poll_function+0xbb/0xf2 [ 63.681451] EAX: 00000000 EBX:
>> >> dfea8320 ECX: 00000001 EDX: 00000062 [ 63.681465] ESI: 00000064
>> >> EDI: 00000000 EBP: df849cfc ESP: df849cdc [ 63.681479] DS: 007b
>> >> ES: 007b FS: 00d8 GS: 0000 SS: 0069 [ 63.681493] Process events/0
>> >> (pid: 5, ti=df848000 task=df839480 task.ti=df848000) [ 63.681508]
>> >> Stack: [ 63.681516] dfeac828 00000002 dfeac828 dfea8368 dfea0068
>> >> 0000002c dfeac828 c13002c6 [ 63.681555]<0> df849d1c c1079ab8
>> >> df849d48 c2386358 c2386328 0000002c 00000000 c2386328 [
>> >> 63.681598]<0> df849d5c c1079ce8 000028cd 88bbcad9 d3b2cae7 0000000e
>> >> d3b2cae7 0000000e [ 63.681646] Call Trace: [ 63.681662]
>> >> [<c13002c6>] ? smart_poll_function+0x0/0xf2 [ 63.681683]
>> >> [<c1079ab8>] ? __run_hrtimer+0xa9/0xf6 [ 63.681701] [<c1079ce8>]
>> >> ? hrtimer_interrupt+0xcd/0x1c8 [ 63.681719] [<c102cef0>] ?
>> >> xen_timer_interrupt+0x2b/0x224 [ 63.681737] [<c102cb3f>] ?
>> >> xen_force_evtchn_callback+0xf/0x14 [ 63.681755] [<c102d2ac>] ?
>> >> check_events+0x8/0xc [ 63.681776] [<c102d2a3>] ?
>> >> xen_restore_fl_direct_end+0x0/0x1 [ 63.681795] [<c14d1471>] ?
>> >> _spin_unlock_irqrestore+0x2f/0x31 [ 63.681814] [<c105eb9e>] ?
>> >> try_to_wake_up+0x2fa/0x304 [ 63.681832] [<c102cb3f>] ?
>> >> xen_force_evtchn_callback+0xf/0x14 [ 63.681850] [<c10a0cc4>] ?
>> >> handle_IRQ_event+0x5f/0x122 [ 63.681867] [<c10a233f>] ?
>> >> handle_level_irq+0x58/0xa9 [ 63.681886] [<c121983d>] ?
>> >> __xen_evtchn_do_upcall+0xab/0x131 [ 63.681904] [<c1219c71>] ?
>> >> xen_evtchn_do_upcall+0x20/0x30 [ 63.682179] [<c102ffe7>] ?
>> >> xen_do_upcall+0x7/0xc [ 63.682179] [<c102007b>] ?
>> >> apic_reg_write+0xa5/0x52f [ 63.682179] [<c1002227>] ?
>> >> hypercall_page+0x227/0x1005 [ 63.682179] [<c102cb3f>] ?
>> >> xen_force_evtchn_callback+0xf/0x14 [ 63.682179] [<c102d2ac>] ?
>> >> check_events+0x8/0xc [ 63.682179] [<c102d26b>] ?
>> >> xen_irq_enable_direct_end+0x0/0x1 [ 63.682179] [<c105cd0d>] ?
>> >> finish_task_switch+0x4f/0xa6 [ 63.682179] [<c14d0186>] ?
>> >> schedule+0x7dd/0x861 [ 63.682179] [<c106dd9d>] ?
>> >> __mod_timer+0x135/0x140 [ 63.682179] [<c102d2ac>] ?
>> >> check_events+0x8/0xc [ 63.682179] [<c102d2a3>] ?
>> >> xen_restore_fl_direct_end+0x0/0x1 [ 63.682179] [<c14d1471>] ?
>> >> _spin_unlock_irqrestore+0x2f/0x31 [ 63.682179] [<c107750b>] ?
>> >> prepare_to_wait+0x43/0x48 [ 63.682179] [<c10742a2>] ?
>> >> worker_thread+0x94/0x1d2 [ 63.682179] [<c10ccd2d>] ?
>> >> vmstat_update+0x0/0x2f [ 63.682179] [<c1077357>] ?
>> >> autoremove_wake_function+0x0/0x33 [ 63.682179] [<c107420e>] ?
>> >> worker_thread+0x0/0x1d2 [ 63.682179] [<c1077120>] ?
>> >> kthread+0x61/0x66 [ 63.682179] [<c10770bf>] ? kthread+0x0/0x66 [
>> >> 63.682179] [<c102ff97>] ? kernel_thread_helper+0x7/0x10 [
>> >> 63.682179] Code: c6 89 d0 31 d2 f7 f6 85 d2 75 1a 85 c9 75 0c 8b 83
>> >> 90 08 00 00 c6 40 10 00 eb 32 c7 83 54 45 00 00 00 00 00 00 8b 83 90
>> >> 08 00 00<80> 78 10 00 74 1c 8b 4d e8 b8 00 ca 9a 3b 31 d2 f7 71 44
>> >> 31 c9 [ 63.682179] EIP: [<c1300381>] smart_poll_function+0xbb/0xf2
>> >> SS:ESP 0069:df849cdc [ 63.682179] CR2: 0000000000000010 [
>> >> 63.682179] ---[ end trace 760037e75e5675c8 ]--- [ 63.682179]
>> >> Kernel panic - not syncing: Fatal exception in interrupt [
>> >> 63.682179] Pid: 5, comm: events/0 Tainted: G D 2.6.32.16 #1
>> >> [ 63.682179] Call Trace: [ 63.682179] [<c14cf7b1>] ?
>> >> printk+0xf/0x11 [ 63.682179] [<c14cf6ee>] panic+0x39/0xed [
>> >> 63.682179] [<c14d2085>] oops_end+0xa1/0xb0 [ 63.682179]
>> >> [<c104b426>] no_context+0x137/0x141 [ 63.682179] [<c104b56f>]
>> >> __bad_area_nosemaphore+0x13f/0x147 [ 63.682179] [<c104b584>]
>> >> bad_area_nosemaphore+0xd/0x10 [ 63.682179] [<c14d3275>]
>> >> do_page_fault+0x1c6/0x32b [ 63.682179] [<c14d30af>] ?
>> >> do_page_fault+0x0/0x32b [ 63.682179] [<c14d16c6>]
>> >> error_code+0x66/0x6c [ 63.682179] [<c14d30af>] ?
>> >> do_page_fault+0x0/0x32b [ 63.682179] [<c1300381>] ?
>> >> smart_poll_function+0xbb/0xf2 [ 63.682179] [<c13002c6>] ?
>> >> smart_poll_function+0x0/0xf2 [ 63.682179] [<c1079ab8>]
>> >> __run_hrtimer+0xa9/0xf6 [ 63.682179] [<c1079ce8>]
>> >> hrtimer_interrupt+0xcd/0x1c8 [ 63.682179] [<c102cef0>]
>> >> xen_timer_interrupt+0x2b/0x224 [ 63.682179] [<c102cb3f>] ?
>> >> xen_force_evtchn_callback+0xf/0x14 [ 63.682179] [<c102d2ac>] ?
>> >> check_events+0x8/0xc [ 63.682179] [<c102d2a3>] ?
>> >> xen_restore_fl_direct_end+0x0/0x1 [ 63.682179] [<c14d1471>] ?
>> >> _spin_unlock_irqrestore+0x2f/0x31 [ 63.682179] [<c105eb9e>] ?
>> >> try_to_wake_up+0x2fa/0x304 [ 63.682179] [<c102cb3f>] ?
>> >> xen_force_evtchn_callback+0xf/0x14 [ 63.682179] [<c10a0cc4>]
>> >> handle_IRQ_event+0x5f/0x122 [ 63.682179] [<c10a233f>]
>> >> handle_level_irq+0x58/0xa9 [ 63.682179] [<c121983d>]
>> >> __xen_evtchn_do_upcall+0xab/0x131 [ 63.682179] [<c1219c71>]
>> >> xen_evtchn_do_upcall+0x20/0x30 [ 63.682179] [<c102ffe7>]
>> >> xen_do_upcall+0x7/0xc [ 63.682179] [<c102007b>] ?
>> >> apic_reg_write+0xa5/0x52f [ 63.682179] [<c1002227>] ?
>> >> hypercall_page+0x227/0x1005 [ 63.682179] [<c102cb3f>] ?
>> >> xen_force_evtchn_callback+0xf/0x14 [ 63.682179] [<c102d2ac>]
>> >> check_events+0x8/0xc [ 63.682179] [<c102d26b>] ?
>> >> xen_irq_enable_direct_end+0x0/0x1 [ 63.682179] [<c105cd0d>] ?
>> >> finish_task_switch+0x4f/0xa6 [ 63.682179] [<c14d0186>]
>> >> schedule+0x7dd/0x861 [ 63.682179] [<c106dd9d>] ?
>> >> __mod_timer+0x135/0x140 [ 63.682179] [<c102d2ac>] ?
>> >> check_events+0x8/0xc [ 63.682179] [<c102d2a3>] ?
>> >> xen_restore_fl_direct_end+0x0/0x1 [ 63.682179] [<c14d1471>] ?
>> >> _spin_unlock_irqrestore+0x2f/0x31 [ 63.682179] [<c107750b>] ?
>> >> prepare_to_wait+0x43/0x48 [ 63.682179] [<c10742a2>]
>> >> worker_thread+0x94/0x1d2 [ 63.682179] [<c10ccd2d>] ?
>> >> vmstat_update+0x0/0x2f [ 63.682179] [<c1077357>] ?
>> >> autoremove_wake_function+0x0/0x33 [ 63.682179] [<c107420e>] ?
>> >> worker_thread+0x0/0x1d2 [ 63.682179] [<c1077120>]
>> >> kthread+0x61/0x66 [ 63.682179] [<c10770bf>] ? kthread+0x0/0x66 [
>> >> 63.682179] [<c102ff97>] kernel_thread_helper+0x7/0x10
>>
>
>
--
Sent from my Android phone with K-9 Mail. Please excuse my brevity.
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