Re: [Xen-devel] Reporting some xen 4.1.2* issues like limitations to 4 VCPUs for debian squeeze HVMs

[Konrad Rzeszutek Wilk <konrad.wilk@xxxxxxxxxx>]

> [    0.024001] installing Xen timer for CPU 1
> [    0.024001] BUG: unable to handle kernel NULL pointer dereference at 
> 0000000000000018
> [    0.024001] IP: [<ffffffff810e7f7a>] __kmalloc+0xc0/0x141
> [    0.024001] PGD 0
> [    0.024001] Oops: 0000 [#1] SMP
> [    0.024001] last sysfs file:
> [    0.024001] CPU 1
> [    0.024001] Modules linked in:
> [    0.024001] Pid: 0, comm: swapper Not tainted 2.6.32-5-amd64 #1 HVM domU
> [    0.024001] RIP: 0010:[<ffffffff810e7f7a>]  [<ffffffff810e7f7a>] 
> __kmalloc+0xc0/0x141
> [    0.744015] Stuck ??
> [    0.744015] Booting processor 3 APIC 0x6 ip 0x6000
> [    0.024001] Initializing CPU#3
> [    0.024001] RSP: 0018:ffff88020f0b5d88  EFLAGS: 00010046
> [    0.024001] RAX: 0000000000000001 RBX: 00000000000000d0 RCX: 
> 0000000200000010
> [    0.024001] RDX: 0000000000000000 RSI: 00000000000000d0 RDI: 
> ffffffff81196c8d
> [    0.024001] RBP: 0000000000000246 R08: 000000000000000a R09: 
> 0000000000000000
> [    0.024001] R10: 0000000000000000 R11: 00000000000186a0 R12: 
> ffffffff81453f10
> [    0.024001] R13: 00000000000000d0 R14: 00000000000000d0 R15: 
> 0000000000000007
> [    0.024001] FS:  0000000000000000(0000) GS:ffff880008c20000(0000) 
> knlGS:0000000000000000
> [    0.024001] CS:  0010 DS: 0018 ES: 0018 CR0: 000000008005003b
> [    0.024001] CR2: 0000000000000018 CR3: 0000000001001000 CR4: 
> 00000000000006e0
> [    0.024001] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 
> 0000000000000000
> [    0.024001] DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 
> 0000000000000400
> [    0.024001] Process swapper (pid: 0, threadinfo ffff88020f0b4000, task 
> ffff88020f093880)
> [    0.024001] Stack:
> [    0.024001]  ffffffffffffffff ffffffff81196c8d 0000003608c20000 
> 00000000000000d0
> [    0.024001]<0>  ffff88020f0b5e38 0000000000000007 ffffffff813a0fcd 
> 0000000000000000
> [    0.024001]<0>  0000000000000000 ffffffff81196c8d 0000000000000000 
> 0000000000000000
> [    0.024001] Call Trace:
> [    0.024001]  [<ffffffff81196c8d>] ? kvasprintf+0x41/0x68
> [    0.024001]  [<ffffffff81196c8d>] ? kvasprintf+0x41/0x68
> [    0.024001]  [<ffffffff81196cfd>] ? kasprintf+0x49/0x54
> [    0.024001]  [<ffffffff8119774b>] ? __bitmap_weight+0x3a/0x7e
> [    0.024001]  [<ffffffff812f5a8f>] ? set_cpu_sibling_map+0x2f4/0x311
> [    0.024001]  [<ffffffff8100dee4>] ? xen_setup_timer+0x2c/0xa2
> [    0.024001]  [<ffffffff8100df71>] ? xen_hvm_setup_cpu_clockevents+0x17/0x1d
> [    0.024001]  [<ffffffff812f5c6a>] ? start_secondary+0x17c/0x185
> [    0.024001] Code: 10 74 05 e8 90 33 21 00 9c 58 66 66 90 66 90 48 89 c5 fa 
> 66 66 90 66 66 90 65 8b 04 25 a8 e3 00 00 48 98 49 8b 94 c4 f0 02 00 00<8b>  
> 4a 18 89 4c 24 14 48 8b 1a 48 85 db 74 0c 8b 42 14 48 8b 04
> [    0.024001] RIP  [<ffffffff810e7f7a>] __kmalloc+0xc0/0x141

This looks vagualy familiar. Like this:
https://lkml.org/lkml/2011/7/8/127

I wonder if the kernel is just compiled with MAX_CPUs of 4 and we try to stuff
more in and end up well, hitting disaster zone.

Is there a .config of this kernel?

_______________________________________________
Xen-devel mailing list
Xen-devel@xxxxxxxxxxxxxxxxxxx
http://lists.xensource.com/xen-devel