[Xen-devel] bug in usbback

["James Harper" <james.harper@xxxxxxxxxxxxxxxx>]

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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