Re: Kernel bug from 3.0 (was phy disks and vifs timing out in DomU)

[Anthony Wright <anthony@overnetdata.com>]

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On 19/08/2011 13:56, Konrad Rzeszutek Wilk wrote:
> On Fri, Aug 19, 2011 at 11:22:15AM +0100, Anthony Wright wrote:
>> On 03/08/2011 16:28, Konrad Rzeszutek Wilk wrote:
>>> On Fri, Jul 29, 2011 at 08:53:02AM +0100, Anthony Wright wrote:
>>>> I've just upgraded to xen 4.1.1 with a stock 3.0 kernel on dom0 (with
>>>> the vga-support patch backported). I can't get my DomU's to work due to
>>>> the phy disks and vifs timing out in DomU and looking through my logs
>>>> this morning I'm getting a consistent kernel bug report with xen
>>>> mentioned at the top of the stack trace and vifdisconnect mentioned on
>>> Yikes! Ian any ideas what to try?
>>>
>>> Anthony, can you compile the kernel with debug=y and when this happens
>>> see what 'xl dmesg' gives? Also there is also the 'xl debug-keys g' which
>>> should dump the grants in use.. that might help a bit.
>> I've compiled a 3.0.1 kernel with CONFIG_DEBUG=Y (a number of other
>> config values appeared at this point, and I took defaults for them).
>>
>> The output from /var/log/messages & 'xl dmesg' is attached. There was no
>> output from 'xl debug-keys g'.
> Ok, so I am hitting this too - I was hoping that the patch from Stefano
> would have fixed the issue, but sadly it did not.
>
> Let me (I am traveling right now) see if I can come up with an internim
> solution until Ian comes with the right fix.
>
On different hardware with the same software I'm also getting problems
starting DomUs, but this time the error is different. I've attached a
copy of the xl console output, but basically the server hang at
"Mount-cache hash table entries: 512". Again the VM is paravirtualised,
and again I get a qemu-dm process for it.

The references to this message are normally related to memory issues,
but the server has only 1000M of ram, so can't see it causing too much
of a problem.

Is this related to the other problems I'm seeing or completely separate?

thanks,

Anthony



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[    3.226308] Reserving virtual address space above 0xf5800000                
[    3.226308] Linux version 2.6.30.1 (root@deb-builder) (gcc version 4.3.2 (GCC) ) #2 SMP Mon Jul 18 12:06:12 GMT 2011
[    3.226308] KERNEL supported cpus:                                                                                  
[    3.226308]   Intel GenuineIntel                                                                                    
[    3.226308]   AMD AuthenticAMD                                                                                      
[    3.226308]   NSC Geode by NSC                                                                                      
[    3.226308]   Cyrix CyrixInstead                                                                                    
[    3.226308]   Centaur CentaurHauls                                                                                  
[    3.226308]   Transmeta GenuineTMx86                                                                                
[    3.226308]   Transmeta TransmetaCPU                                                                                
[    3.226308]   UMC UMC UMC UMC                                                                                       
[    3.226308] BIOS-provided physical RAM map:                                                                         
[    3.226308]  Xen: 0000000000000000 - 00000000000a0000 (usable)                                                      
[    3.226308]  Xen: 00000000000a0000 - 0000000000100000 (reserved)                                                    
[    3.226308]  Xen: 0000000000100000 - 000000000065c000 (usable)                                                      
[    3.226308]  Xen: 000000000065c000 - 0000000000853000 (reserved)                                                    
[    3.226308]  Xen: 0000000000853000 - 000000007d000000 (usable)                                                      
[    3.226308] DMI not present or invalid.                                                                             
[    3.226308] last_pfn = 0x7d000 max_arch_pfn = 0x1000000                                                             
[    3.226308] init_memory_mapping: 0000000000000000-00000000229fe000                                                  
[    3.226308] NX (Execute Disable) protection: active                                                                 
[    3.226308] 1446MB HIGHMEM available.                                                                               
[    3.226308] 553MB LOWMEM available.                                                                                 
[    3.226308]   mapped low ram: 0 - 229fe000                                                                          
[    3.226308]   low ram: 0 - 229fe000                                                                                 
[    3.226308]   node 0 low ram: 00000000 - 229fe000                                                                   
[    3.226308]   node 0 bootmap 00007000 - 0000b540                                                                    
[    3.226308] (7 early reservations) ==> bootmem [0000000000 - 00229fe000]                                            
[    3.226308]   #0 [0000000000 - 0000001000]   BIOS data page ==> [0000000000 - 0000001000]                           
[    3.226308]   #1 [0000853000 - 000085b000]   XEN PAGETABLES ==> [0000853000 - 000085b000]                           
[    3.226308]   #2 [0000001000 - 0000002000]    EX TRAMPOLINE ==> [0000001000 - 0000002000]                           
[    3.226308]   #3 [0000006000 - 0000007000]       TRAMPOLINE ==> [0000006000 - 0000007000]                           
[    3.226308]   #4 [0000100000 - 00005366f4]    TEXT DATA BSS ==> [0000100000 - 00005366f4]                           
[    3.226308]   #5 [0000537000 - 0000643000]          PGTABLE ==> [0000537000 - 0000643000]                           
[    3.226308]   #6 [0000007000 - 000000c000]          BOOTMAP ==> [0000007000 - 000000c000]                           
[    3.226308] Zone PFN ranges:                                                                                        
[    3.226308]   DMA      0x00000000 -> 0x00001000                                                                     
[    3.226308]   Normal   0x00001000 -> 0x000229fe                                                                     
[    3.226308]   HighMem  0x000229fe -> 0x0007d000                                                                     
[    3.226308] Movable zone start PFN for each node                                                                    
[    3.226308] early_node_map[3] active PFN ranges                                                                     
[    3.226308]     0: 0x00000000 -> 0x000000a0                                                                         
[    3.226308]     0: 0x00000100 -> 0x0000065c                                                                         
[    3.226308]     0: 0x00000853 -> 0x0007d000
[    3.226308] Using APIC driver default
[    3.226308] SMP: Allowing 8 CPUs, 0 hotplug CPUs
[    3.226308] Local APIC disabled by BIOS -- you can enable it with "lapic"
[    3.226308] Allocating PCI resources starting at 80000000 (gap: 7d000000:83000000)
[    3.226308] NR_CPUS:8 nr_cpumask_bits:8 nr_cpu_ids:8 nr_node_ids:1
[    3.226308] PERCPU: Allocated 6 4k pages, static data 22940 bytes
[    3.810521] Xen: using vcpu_info placement
[    0.000000] Built 1 zonelists in Zone order, mobility grouping on.  Total pages: 507400
[    0.000000] Kernel command line: root=/dev/xvda1
[    0.000000] Enabling fast FPU save and restore... done.
[    0.000000] Enabling unmasked SIMD FPU exception support... done.
[    0.000000] Initializing CPU#0
[    0.000000] NR_IRQS:512
[    0.000000] PID hash table entries: 4096 (order: 12, 16384 bytes)
[    0.000000] Detected 2533.462 MHz processor.
[    0.010000] Console: colour dummy device 80x25
[    0.010000] console [tty0] enabled
[    0.010000] console [hvc0] enabled
[    0.010000] Dentry cache hash table entries: 131072 (order: 7, 524288 bytes)
[    0.010000] Inode-cache hash table entries: 65536 (order: 6, 262144 bytes)
[    0.010000] Initializing HighMem for node 0 (000229fe:0007d000)
[    0.010000] Memory: 2022248k/2048000k available (2539k kernel code, 22480k reserved, 1067k data, 244k init, 1480712k highmem)
[    0.010000] virtual kernel memory layout:
[    0.010000]     fixmap  : 0xf574f000 - 0xf57ff000   ( 704 kB)
[    0.010000]     pkmap   : 0xf5200000 - 0xf5400000   (2048 kB)
[    0.010000]     vmalloc : 0xe31fe000 - 0xf51fe000   ( 288 MB)
[    0.010000]     lowmem  : 0xc0000000 - 0xe29fe000   ( 553 MB)
[    0.010000]       .init : 0xc0490000 - 0xc04cd000   ( 244 kB)
[    0.010000]       .data : 0xc037ae1d - 0xc0485e18   (1067 kB)
[    0.010000]       .text : 0xc0100000 - 0xc037ae1d   (2539 kB)
[    0.010000] Checking if this processor honours the WP bit even in supervisor mode...Ok.
[    0.010000] installing Xen timer for CPU 0
[    0.010000] Calibrating delay loop (skipped), value calculated using timer frequency.. 5066.92 BogoMIPS (lpj=25334620)
[    0.010000] Mount-cache hash table entries: 512

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