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Re: [Xen-devel] bug in usbback

To: James Harper <james.harper@xxxxxxxxxxxxxxxx>, "xen-devel@xxxxxxxxxxxxxxxxxxx" <xen-devel@xxxxxxxxxxxxxxxxxxx>
Subject: Re: [Xen-devel] bug in usbback
From: Keir Fraser <keir.fraser@xxxxxxxxxxxxx>
Date: Sat, 25 Jul 2009 11:12:47 +0100
Cc: n_iwamatsu@xxxxxxxxxxxxxx
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Cc'ing the author...


On 25/07/2009 11:01, "James Harper" <james.harper@xxxxxxxxxxxxxxxx> wrote:

> I think there is a bug in pvusb when the DomU does not respond to the
> XenbusStateReconfiguring state change and is then rebooted. This caused
> the following Dom0 (after a long freeze):
> BUG: soft lockup detected on CPU#0!
> Call Trace:
>  <IRQ> [<ffffffff802a938c>] softlockup_tick+0xe1/0xef
>  [<ffffffff80268f82>] timer_interrupt+0x408/0x466
>  [<ffffffff8020fb41>] handle_IRQ_event+0x4d/0x95
>  [<ffffffff802a9870>] __do_IRQ+0xb4/0x127
>  [<ffffffff8026729c>] do_IRQ+0x44/0x4d
>  [<ffffffff80375f6b>] evtchn_do_upcall+0x1b3/0x26e
>  [<ffffffff8025c8d2>] do_hypervisor_callback+0x1e/0x2c
>  <EOI> [<ffffffff88355b7e>] :usbbk:usbbk_schedule+0x1e0/0xa3f
>  [<ffffffff8029482f>] autoremove_wake_function+0x0/0x2e
>  [<ffffffff802947ba>] keventd_create_kthread+0x0/0x62
>  [<ffffffff8835599e>] :usbbk:usbbk_schedule+0x0/0xa3f
>  [<ffffffff802947ba>] keventd_create_kthread+0x0/0x62
>  [<ffffffff802325e4>] kthread+0xd4/0x108
>  [<ffffffff8025cb24>] child_rip+0xa/0x12
>  [<ffffffff802947ba>] keventd_create_kthread+0x0/0x62
>  [<ffffffff8025c827>] error_exit+0x0/0x71
>  [<ffffffff80232510>] kthread+0x0/0x108
>  [<ffffffff8025cb1a>] child_rip+0x0/0x12
> FYI, I am trying to get pvusb working under GPLPV and I had never seen
> the Reconfiguring/Reconfigured states before and so I wasn't doing
> anything with them...
> James
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