that's a 1 year old xen kernel bug

Paul

On Sat, Sep 29, 2012 at 8:38 AM, Robert Munteanu <robert.munteanu@gmail.com> wrote:
Without disclosing details about our instance, let's check we're up to
date in terms of patches applied.

See for instance http://www.securityfocus.com/bid/38857/info

Robert

On Sat, Sep 29, 2012 at 9:51 AM, Damien Regad
<damien.regad@merckgroup.com> wrote:
> FYI I got an alert at 07:13 CET that the site was down.
>
> In the linode console, I saw that the server had been rebooted twice earlier in
> the night (at 02:32 and 02:33), and was listed as up and running although there
> seemed to be no activity (CPU and traffic graphs flat).
>
> Since I could not connect by SSH, I checked on the console and saw this -
>
> [linode137251@dallas383 lish]
>  [<c0103fa5>] ? pte_pfn_to_mfn+0xb5/0xd0
>  [<c019e111>] ? unmap_page_range+0x111/0x190
>  [<c019e2bb>] ? unmap_vmas+0x12b/0x1e0
>  [<c01a0481>] ? exit_mmap+0x91/0x140
>  [<c01324eb>] ? mmput+0x2b/0xc0
>  [<c0135ddf>] ? exit_mm+0xef/0x120
>  [<c068fb50>] ? _raw_spin_lock_irq+0x10/0x20
>  [<c01379d5>] ? do_exit+0x125/0x350
>  [<c0137c3c>] ? do_group_exit+0x3c/0xa0
>  [<c0142b17>] ? get_signal_to_deliver+0x1a7/0x3d0
>  [<c012f9f7>] ? finish_task_switch+0x47/0xb0
>  [<c0108cbf>] ? do_signal+0x8f/0x150
>  [<c01062c4>] ? check_events+0x8/0xc
>  [<c0105ae7>] ? xen_force_evtchn_callback+0x17/0x30
>  [<c01062c4>] ? check_events+0x8/0xc
>  [<c068faf5>] ? _raw_spin_lock+0x5/0x10
>  [<c01ebc20>] ? locks_delete_block+0x40/0x50
>  [<c0105ae7>] ? xen_force_evtchn_callback+0x17/0x30
>  [<c01062c4>] ? check_events+0x8/0xc
>  [<c01062bb>] ? xen_restore_fl_direct_reloc+0x4/0x4
>  [<c01af1d1>] ? kmem_cache_free+0x41/0x60
>  [<c0108dc8>] ? do_notify_resume+0x48/0x50
>  [<c068ff12>] ? work_notifysig+0x9/0xf
>  [<c0680000>] ? sctp_rcv_ootb+0x50/0xf0
>
> So I rebooted again, and now the situation seems normal. Site is up since 08:30
> (downtime 1 hr 17 min 29 secs).
>
> I have no idea what happened, but have no time to do any more detailed
> investigation at the moment.
>
> Damien
>
>
>
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Find out how slow your code is with AppDynamics Lite.
http://ad.doubleclick.net/clk;262219672;13503038;z?
http://info.appdynamics.com/FreeJavaPerformanceDownload.html
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