Re: [Xen-devel] bug # 477

[Florian Kirstein <xenlist@xxxxxxxxxxxxxx>]

Hallo,

> data. I have confirmed this behaviour in the March 14th pull as well as
> the March 17 pull from xen-unstable-hg.    I have also found that if
> xenconsoled does not crash, it goes to 100% CPU in dom0.   Any thoughts?
Sorry, none, but I can reproduce this in the current unstable version
(2006/04/28) easily and also had it in older versions. Can't reporduce it
in Xen 2, there the console works smoothly. Test-System was a P4
without hyperthreading.

Easiest way seems to be to open a console to a domU, start "cat" and paste
some larger block of text (I used the content of a full 90x80 xterm) and it
brings xenconsoled in Dom0 to 100% CPU reliably, either for quite some
time (30 seconds or so) or even until I kill it. In both cases the DomU
get's the "soft lockup detected" (see below). Tried various console-buffer
sizes in the xend config but it doesn't seem to make a difference.

OK, you could say "then don't do this", but I'd like to give some users
console-acces for their VMs and it wouldn't be nice if they could
bring my Dom0 into such troubles by simply pasting a block of text
into the console...

MfG, Florian Kirstein

P.S: the error I get every time:
Mar 29 06:55:52 vmtest kernel: BUG: soft lockup detected on CPU#0!
Mar 29 06:55:52 vmtest kernel: 
Mar 29 06:55:52 vmtest kernel: Pid: 0, comm:              swapper
Mar 29 06:55:52 vmtest kernel: EIP: 0061:[<c01010c7>] CPU: 0
Mar 29 06:55:52 vmtest kernel: EIP is at 0xc01010c7
Mar 29 06:55:52 vmtest kernel:  EFLAGS: 00000246    Not tainted  (2.6.16-xenU 
#1)
Mar 29 06:55:52 vmtest kernel: EAX: 00000000 EBX: 00000001 ECX: 00000000 EDX: 
000027d5
Mar 29 06:55:52 vmtest kernel: ESI: c035a000 EDI: 00000001 EBP: c035bfa8 DS: 
007b ES: 007b
Mar 29 06:55:52 vmtest kernel: CR0: 8005003b CR2: 0804e85c CR3: 0035d000 CR4: 
00000640
Mar 29 06:55:52 vmtest kernel:  [<c01053c1>] show_trace+0x21/0x30
Mar 29 06:55:52 vmtest kernel:  [<c0102f80>] show_regs+0x1a0/0x1c8
Mar 29 06:55:52 vmtest kernel:  [<c013de51>] softlockup_tick+0x81/0x90
Mar 29 06:55:52 vmtest kernel:  [<c01280cf>] do_timer+0x3f/0xd0
Mar 29 06:55:52 vmtest kernel:  [<c0108f5c>] timer_interrupt+0x1cc/0x610
Mar 29 06:55:52 vmtest kernel:  [<c013e163>] handle_IRQ_event+0x73/0xc0
Mar 29 06:55:52 vmtest kernel:  [<c013e239>] __do_IRQ+0x89/0x100
Mar 29 06:55:52 vmtest kernel:  [<c0106b20>] do_IRQ+0x20/0x30
Mar 29 06:55:52 vmtest kernel:  [<c025414e>] evtchn_do_upcall+0x8e/0x110
Mar 29 06:55:52 vmtest kernel:  [<c01050fc>] hypervisor_callback+0x2c/0x34
Mar 29 06:55:52 vmtest kernel:  [<c0102c05>] cpu_idle+0x85/0xf0
Mar 29 06:55:52 vmtest kernel:  [<c0102035>] rest_init+0x35/0x40
Mar 29 06:55:52 vmtest kernel:  [<c035c9a5>] start_kernel+0x1c5/0x210
Mar 29 06:55:52 vmtest kernel:  [<c010006f>] 0xc010006f


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