[Xen-devel] warning to anyone trying the wdm branch of the gpl pv drivers

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

Just a warning to anyone who is trying the gpl pv drivers from the hg
wdm branch, eg only if you've built them yourself as I haven't yet
released a binary of that version.

I'm getting BSoD's on the windows DomU which are hanging my Dom0 for
somewhere between 5-10 minutes with a "BUG: soft lockup detected on
CPU#0!". I'm pretty sure that the problem has been introduced by changes
I have made that I haven't checked in yet, but I'm not sure so maybe
don't do any testing on a production Dom0 at this point :)

Can anyone give me any clues as to what DomU behaviour could cause Dom0
to do this? The full text of the bug check is:

"
BUG: soft lockup detected on CPU#0!

Call Trace:
 <IRQ> [<ffffffff8029fae4>] softlockup_tick+0xdb/0xed
 [<ffffffff80267d7a>] timer_interrupt+0x38d/0x3db
 [<ffffffff80211154>] handle_IRQ_event+0x2d/0x60
 [<ffffffff8029fe23>] __do_IRQ+0xa4/0x105
 [<ffffffff8028360e>] _local_bh_enable+0x59/0xb3
 [<ffffffff80266568>] do_IRQ+0x65/0x73
 [<ffffffff80360f61>] evtchn_do_upcall+0x86/0xe0
 [<ffffffff8025c5da>] do_hypervisor_callback+0x1e/0x2c
 <EOI> [<ffffffff8020622a>] hypercall_page+0x22a/0x1000
 [<ffffffff8020622a>] hypercall_page+0x22a/0x1000
 [<ffffffff8036073a>] force_evtchn_callback+0xa/0xb
 [<ffffffff8036a750>] make_response+0x122/0x131
 [<ffffffff8036af96>] blkif_schedule+0x24f/0x328
 [<ffffffff8028fa28>] autoremove_wake_function+0x0/0x2e
 [<ffffffff8028f865>] keventd_create_kthread+0x0/0x61
 [<ffffffff8036ad47>] blkif_schedule+0x0/0x328
 [<ffffffff8028f865>] keventd_create_kthread+0x0/0x61
 [<ffffffff8023352b>] kthread+0xd4/0x107
 [<ffffffff8025c830>] child_rip+0xa/0x12
 [<ffffffff8028f865>] keventd_create_kthread+0x0/0x61
 [<ffffffff80233457>] kthread+0x0/0x107
 [<ffffffff8025c826>] child_rip+0x0/0x12
"

And it happens at the point when the DomU bluescreens.

James

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