RE: [Xen-devel] Another dom0 crash (Unable to handle kernel NULLpointer dereference)

["Ian Pratt" <m+Ian.Pratt@xxxxxxxxxxxx>]

> Subject: [Xen-devel] Another dom0 crash (Unable to handle 
> kernel NULLpointer dereference)
> 
> This time running Xen 3.0.2-2, PAE

Please can you supply more information e.g. how many VMs were running,
do you know what they were doing, can you repro, details about the h/w,
amount of memory etc. This is a separate issue from the previous one. 

I seem to recall a similar crash has been reported before, but there was
no repro information in the report either.

Thanks,
Ian
 
> Previous post:
> http://lists.xensource.com/archives/html/xen-devel/2006-04/msg
> 00446.html
> 
> Unable to handle kernel NULL pointer dereference at virtual 
> address 00000004
>   printing eip:
> c0161905
> 07786000 -> *pde = 00000001:058d6001
> 06e54000 -> *pme = 00000000:00000000
> Oops: 0002 [#1]
> SMP
> Modules linked in:
> CPU:    1
> EIP:    0061:[<c0161905>]    Not tainted VLI
> EFLAGS: 00010046   (2.6.16-xen0 #1)
> EIP is at cache_alloc_refill+0x185/0x560
> eax: c0670f00   ebx: ffffffff   ecx: 00000010   edx: 00000000
> esi: c8bd1000   edi: 00000002   ebp: c00dfe00   esp: cfa7be3c
> ds: 007b   es: 007b   ss: 0069
> Process kjournald (pid: 1187, threadinfo=cfa7a000 task=cfa0ca70)
> Stack: <0>000016a7 00000000 c0525e40 00000050 00000050 
> 00000050 c0673b40 c066f800
>         c0670f00 c01408db c0664958 cfa7a000 c10f06e0 c8bd101c 
> 00000001 c10f06e0
>         00000000 00000000 00001000 c0161777 c10f06e0 00000000 
> c01679e9 c0673b40 Call Trace:
>   [<c01408db>] add_to_page_cache+0x6b/0x100
>   [<c0161777>] kmem_cache_alloc+0x77/0x80
>   [<c01679e9>] alloc_buffer_head+0x19/0x50
>   [<c01695fc>] alloc_page_buffers+0x3c/0xe0
>   [<c016b16f>] __getblk+0x15f/0x2b0
>   [<c01ea978>] journal_get_descriptor_buffer+0x68/0xd0
>   [<c01e68d1>] journal_commit_transaction+0xd01/0x11f0
>   [<c0128300>] lock_timer_base+0x20/0x50
>   [<c0129259>] try_to_del_timer_sync+0x49/0x60
>   [<c01e9680>] kjournald+0xc0/0x230
>   [<c01e8e80>] commit_timeout+0x0/0x10
>   [<c0134130>] autoremove_wake_function+0x0/0x60
>   [<c01e95c0>] kjournald+0x0/0x230
>   [<c0102cc5>] kernel_thread_helper+0x5/0x10
> Code: 56 0c 8b 3c b8 89 7e 14 89 54 8d 14 41 89 4d 00 8b 44 
> 24 18 8b 7e 10 3b 78 38 0f 83 3a ff ff ff 4b 83 fb ff 75 c0 
> 8b 16 8b 46 04 <89> 42
> 04 89 10 83 7e 14 ff c7 06 00 01 10 00 c7 46 04 00 02 20
> 
> -Chris
> 
> 
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