Re: [Xen-devel] credit2 domU freeze at "Writing SMBIOS tables ..."

[John Weekes <lists.xen@xxxxxxxxxxxxxxxxxx>]

On 4/28/2011 6:10 AM, George Dunlap wrote:
> Is this just using credit2, or does it do the same thing under credit1?
I just re-tested with credit1, and it seems to do the same thing with 
debug=y (on xen-unstable), you're right.
On 4.1 with debug=n and credit1, which is my normal configuration, it 
doesn't appear to happen, or at least didn't happen over the 10 attempts 
that I just made (it could be a rare problem on that setup). I may have 
to do some additional testing with 4.1 credit2, 4.1 debug=y, and 
unstable debug=n, but it's good that you're seeing something 
reproducible on your end, at least (and with debug=y).
> On my box, stubdoms with a 4-vcpu guest on credit1 fail too, with this
> output on the console:
>
> xs_read_watch() ->  /local/domain/3/log-throttling 
> /local/domain/3/log-throttling
> xs_read(/local/domain/3/log-throttling): ENOENT
> (XEN) HVM3: HVM Loader
> xs_read_watch() ->  /local/domain/0/backend/console/3 be:0x13fb66:3:0x154240
> (XEN) HVM3: Detected Xen v4.2-unstable
> Page fault at linear address 0x10, eip 0x49d9, regs 0x3cfb3c, sp 0x0,
> our_sp 0x3cfb18, code 0
> (XEN) HVM3: Xenbus rings @0xfeffc000, event channel 5
> Thread: main
> (XEN) HVM3: System requested ROMBIOS
> EIP: 49d9, EFLAGS 10202.
> (XEN) HVM3: CPU speed is 1995 MHz
> EBX: 00000000 ECX: 001589b0 EDX: 00000000
> ESI: 0000000c EDI: 0000000c EBP: 003cfbb8 EAX: 00000000
> DS: e021 ES: e021 orig_eax: ffffffff, eip: 000049d9
> CS: e019 EFLAGS: 00010202 esp: 00000000 ss: 3cfba4
> base is 0x3cfbb8 caller is 0x24bd3
> base is 0x3cfbf8 caller is 0x9814
> base is 0x3cfe88 caller is 0xe8e91
> base is 0x3cfff0 caller is 0x31ad
>
> 3cfba0: 00 00 00 00 28 15 00 00 00 00 00 00 0a 00 00 00
> 3cfbb0: 67 96 13 00 e8 fb 3c 00 f8 fb 3c 00 d3 4b 02 00
> 3cfbc0: 00 00 00 00 51 e5 01 00 00 00 00 00 00 00 00 00
> 3cfbd0: 00 00 00 00 cb 96 13 00 78 94 00 82 03 00 00 00
>
> 49c0: c8 c1 e8 05 83 e1 1f 8b 44 85 ec d3 f8 a8 01 74
> 49d0: 0e 8b 43 14 89 04 24 ff d2 83 7b 10 00 75 23 8b
> 49e0: 53 0c 85 d2 74 1c 8b 0b 89 c8 c1 e8 05 83 e1 1f
> 49f0: 8b 44 85 e4 d3 f8 a8 01 74 08 8b 43 14 89 04 24
> Pagetable walk from virt 10, base 371000:
>    L3 = 00000000b074f027 (0x372000)  [offset = 0]
>     L2 = 00000000b074d067 (0x374000)  [offset = 0]
>      L1 = 0000000000000000 [offset = 0]
I'm not seeing that one yet.

-John

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