RE: [Xen-devel] Bug in Xen when terminating qemu

["Ian Pratt" <m+Ian.Pratt@xxxxxxxxxxxx>]

> We are running QEMU under a xenU to run a windows 2000 server 
> instance since our processor doesn't support VT.  Qemu runs 
> great until it is closed, but when qemu closes the xenU dies 
> hard.  Qemu is running as a user (not root) which implies 
> that xvm's are subject to local user DoS.

Interesting. Please can you try and repro this on Xen 3.0.2 as the FC5
version isn't totally current.

Thanks,
Ian
 
> 
> Any ideas would be greatly appreciated!
> 
> -Eric
> 
> BUG: soft lockup detected on CPU#0!
> 
> Pid: 1161, comm:                 qemu
> EIP: 0061:[<c0101227>] CPU: 0
> EIP is at 0xc0101227
>   EFLAGS: 00000246    Not tainted  (2.6.15-1.2054_FC5xenU #1)
> EAX: 00030000 EBX: 00000000 ECX: 00000000 EDX: c03a18b8
> ESI: d6bf3d58 EDI: d6bf3d28 EBP: 00000002 DS: 007b ES: 007b
> CR0: 8005003b CR2: 00dc95c4 CR3: 01647000 CR4: 00000640
>   [<c020decc>] force_evtchn_callback+0xa/0xc
>   [<c0212601>] read_reply+0xad/0x123
>   [<c029b4f9>] cond_resched+0x36/0x4e
>   [<c0129343>] autoremove_wake_function+0x0/0x3a
>   [<c0212720>] xs_talkv+0xa9/0x12a
>   [<c021281a>] xs_single+0x2d/0x34
>   [<c0212978>] xenbus_read+0x2e/0x3d
>   [<c0212d12>] xenbus_gather+0x33/0x84
>   [<c021183f>] xenbus_read_driver_state+0x1f/0x31
>   [<c0215480>] blkif_release+0x2c/0x3d
>   [<c015a7b5>] blkdev_put+0x71/0x145
>   [<c015454d>] __fput+0xab/0x163
>   [<c0151f23>] filp_close+0x4e/0x57
>   [<c01195aa>] put_files_struct+0x62/0xa2
>   [<c011a8cb>] do_exit+0x1db/0x6f4
>   [<c033ccc0>] huft_free+0x11/0x18
>   [<c011ae6d>] sys_exit_group+0x0/0x11
>   [<c0122b29>] get_signal_to_deliver+0x467/0x490
>   [<c01042ad>] do_notify_resume+0x71/0x5f8
>   [<c029c97f>] _spin_lock_irqsave+0x22/0x27
>   [<c029ca7d>] _spin_unlock_irqrestore+0x9/0x31
>   [<c013c2c6>] free_hot_cold_page+0xb8/0x152
>   [<c016402a>] poll_freewait+0x35/0x3e
>   [<c0164dfa>] do_sys_poll+0x2ea/0x2f5
>   [<c0164033>] __pollwait+0x0/0x9b
>   [<c0165048>] sys_poll+0x45/0x49
>   [<c0104bd3>] work_notifysig+0x13/0x18
> 
> 
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