Re: [Xen-devel] credit2 BUG_ON triggered

[John Weekes <lists.xen@xxxxxxxxxxxxxxxxxx>]

On 4/20/2011 12:10 PM, John Weekes wrote:
> I'm trying to find a way to reproduce that output. 
Trying repeatedly, I did manage to repeat the output. Here's the 
higher-detail version:
(XEN) irq.c:324: Dom7 callback via changed to Direct Vector 0xe9
(XEN) Xen BUG at sched_credit2.c:811
(XEN) ----[ Xen-4.1.1-rc1-pre  x86_64  debug=y  Not tainted ]----
(XEN) CPU:    2
(XEN) RIP:    e008:[<ffff82c4801186b8>] __runq_deassign+0x25/0x6f
(XEN) RFLAGS: 0000000000010002   CONTEXT: hypervisor
(XEN) rax: 0000000000000002   rbx: ffff830c2246be30   rcx: 0000000000000230
(XEN) rdx: ffff83043ffe0248   rsi: 0000000000000000   rdi: ffff830c2246be30
(XEN) rbp: ffff83043ff57ad8   rsp: ffff83043ff57ad0   r8:  0000000000000002
(XEN) r9:  000000000000003e   r10: 0000000000000018   r11: 00000000000186a0
(XEN) r12: ffff83043ffe0010   r13: ffff830c2246be30   r14: 0000000000000080
(XEN) r15: ffff82c480241780   cr0: 000000008005003b   cr4: 00000000000026f0
(XEN) cr3: 0000000c222fd000   cr2: 0000000000000000
(XEN) ds: 0000   es: 0000   fs: 0000   gs: 0000   ss: 0000   cs: e008
(XEN) Xen stack trace from rsp=ffff83043ff57ad0:
(XEN)    000000000000000c ffff83043ff57ae8 ffff82c480118746 ffff83043ff57b58
(XEN)    ffff82c480119e3b 000000013f0cf950 ffff83043ffe0010 ffff83043ffe02d4
(XEN)    ffff8300bf74c000 000000000004cdfc ffff83043ffe0238 ffff83043ff57f18
(XEN)    ffff83043ffe024c ffff83043ffe024c ffff82c4802ba7c0 0000000000000002
(XEN)    ffff82c4802cbec0 ffff83043ff57be8 ffff82c48012122d ffff83043ff57b98
(XEN)    ffff8300bf74c168 ffff82c4802cbec0 ffff82c4802cbec0 ffff82c4802cbec0
(XEN)    00ff82c4802ba7c0 ffff8300bf74c000 0000000000000282 0000000000000286
(XEN)    ffff83043ffe024c ffff82c48012259f ffff8300bf74c000 ffff82c4802cbec0
(XEN)    ffff82c4802ba7c0 ffff83043ffe024c ffff8300bf74c000 ffff83043ff57c18
(XEN)    ffff82c480121739 ffff83043ff57f18 0000000000000002 0000000000000000
(XEN)    ffff830c22276000 ffff83043ff57c98 ffff82c480103e8f ffff830c22276190
(XEN)    00000000ffffffff 0c93001800000000 00000000ffffffff 0c93001800000000
(XEN)    00000000ffffffff 0000000200000000 ffff82c400000009 ffff83043ff57ce8
(XEN)    ffff83043ff57f18 0000000000000008 ffff8300bf74c000 0000000000000018
(XEN)    ffff82c4801a4d59 ffff83043ff57ca8 ffff82c4801a4c9d ffff83043ff57d28
(XEN)    ffff82c4801a4b2b ffff83043ff57cf8 ffff82c48011fbca 0000000000000000
(XEN)    ffff880001855600 0000000000000000 00000000000000fd ffffffff0c930018
(XEN)    0000000000000000 0000000000000000 ffff8300bf74c000 ffff83043ff57f18
(XEN)    0000000000000012 0000000000000000 0000000000000000 ffff83043ff57f08
(XEN)    ffff82c4801c1fa5 0000000000020007 ffff83043ff5e040 ffff83043ff57e38
(XEN) Xen call trace:
(XEN)    [<ffff82c4801186b8>] __runq_deassign+0x25/0x6f
(XEN)    [<ffff82c480118746>] runq_deassign+0x44/0x46
(XEN)    [<ffff82c480119e3b>] csched_cpu_pick+0x273/0x284
(XEN)    [<ffff82c48012122d>] vcpu_migrate+0x164/0x29d
(XEN)    [<ffff82c480121739>] vcpu_force_reschedule+0xad/0xc2
(XEN)    [<ffff82c480103e8f>] do_vcpu_op+0x2b7/0x421
(XEN)    [<ffff82c4801a4c9d>] hvm_vcpu_op+0x18/0x1a
(XEN)    [<ffff82c4801a4b2b>] hvm_do_hypercall+0x1a1/0x2d1
(XEN)    [<ffff82c4801c1fa5>] vmx_vmexit_handler+0xc74/0x1c3a
(XEN)
(XEN)
(XEN) ****************************************
(XEN) Panic on CPU 2:
(XEN) Xen BUG at sched_credit2.c:811
(XEN) ****************************************
(XEN)
(XEN) Reboot in five seconds...

Also, and possibly related, the domU takes a longish time to start, even 
at its best. Often, the delay is a minute or so. Not so with "credit".
-John

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