On Thu, 13 Apr 2006, Keith Owens wrote:
> Nathan Scott (on Thu, 13 Apr 2006 15:35:33 +1000) wrote:
> >On Thu, Apr 13, 2006 at 07:21:45AM +0200, Herbert Poetzl wrote:
> >> [ 39.585041] BUG: unable to handle kernel paging request at virtual address 7856c380
> >> [ 39.586688] printing eip:
> >> [ 39.587040] 78129430
> >> [ 39.587354] *pde = 005bf027
> >> [ 39.587709] *pte = 0056c000
> >> [ 39.588201] Oops: 0000 [#1]
> >> [ 39.588536] SMP DEBUG_PAGEALLOC
> >> [ 39.589057] Modules linked in:
> >> [ 39.589639] CPU: 0
> >> [ 39.589670] EIP: 0060:[<78129430>] Not tainted VLI
> >> [ 39.589710] EFLAGS: 00000206 (2.6.17-rc1 #1)
> >> [ 39.591291] EIP is at notifier_chain_register+0x20/0x50
> >> [ 39.591890] eax: 7856c378 ebx: 878db3f8 ecx: 00000000 edx: 784bf9bc
> >> [ 39.592601] esi: 878db3f8 edi: 878e7c00 ebp: 878db800 esp: 878cad5c
> >> [ 39.593399] ds: 007b es: 007b ss: 0068
> >> [ 39.593896] Process mount (pid: 50, threadinfo=878ca000 task=87f7e570)
> >> [ 39.594530] Stack: <0>784bf9a0 781295f4 784bf9bc 878db3f8 878db000 878db000 78136997 784bf9a0
> >> [ 39.595839] 878db3f8 782d43e6 878db3f8 00000404 878db000 87d1e6a0 878e7c00 782d1813
> >> [ 39.597002] 878db000 00000001 782e5eaf 00000424 00000001 878e7c00 87d1e6a0 782f2150
> >> [ 39.598164] Call Trace:
> >> [ 39.598592] <781295f4> blocking_notifier_chain_register+0x54/0x90 <78136997> register_cpu_notifier+0x17/0x20
> >> [ 39.600024] <782d43e6> xfs_icsb_init_counters+0x46/0xb0 <782d1813> xfs_mount_init+0x23/0x160
> >> [ 39.601199] <782e5eaf> kmem_zalloc+0x1f/0x50 <782f2150> bhv_insert_all_vfsops+0x10/0x50
> >> [ 39.602315] <782f1835> xfs_fs_fill_super+0x35/0x1f0 <78313607> snprintf+0x27/0x30
> >> [ 39.603437] <781a2134> disk_name+0x64/0xc0 <78168fbf> sb_set_blocksize+0x1f/0x50
> >> [ 39.604524] <78168909> get_sb_bdev+0x109/0x160 <781445ef> __alloc_pages+0x5f/0x370
> >> [ 39.605612] <782f1a20> xfs_fs_get_sb+0x30/0x40 <782f1800> xfs_fs_fill_super+0x0/0x1f0
> >> [ 39.606698] <78168bb0> do_kern_mount+0xa0/0x160 <78181467> do_new_mount+0x77/0xc0
> >> [ 39.607764] <78181b2f> do_mount+0x1bf/0x220 <783f4178> iret_exc+0x3d4/0x6ab
> >> [ 39.608790] <78181913> copy_mount_options+0x63/0xc0 <783f398f> lock_kernel+0x2f/0x50
> >> [ 39.609867] <78181f2f> sys_mount+0x9f/0xe0 <78102b27> syscall_call+0x7/0xb
> >> [ 39.610923] Code: 90 90 90 90 90 90 90 90 90 90 90 53 8b 54 24 08 8b 5c 24 0c 8b 02 85 c0 74 31 8b 4b 08 8d b4 26 00 00 00 00 8d bc 27 00 00 00 00 <3b> 48 08 7f 1b 8d 50 04 8b 40 04 85 c0 75 f1 31 c0 eb 0d 90 90
>
> Ignoring the leading NOPs, that decodes to
>
> 0: 53 push %ebx
> 1: 8b 54 24 08 mov 0x8(%esp,1),%edx
> 5: 8b 5c 24 0c mov 0xc(%esp,1),%ebx
> 9: 8b 02 mov (%edx),%eax
> b: 85 c0 test %eax,%eax
> d: 74 31 je 0x40
> f: 8b 4b 08 mov 0x8(%ebx),%ecx
> 12: 8d b4 26 00 00 00 00 lea 0x0(%esi,1),%esi
> 19: 8d bc 27 00 00 00 00 lea 0x0(%edi,1),%edi
> 20: 3b 48 08 cmp 0x8(%eax),%ecx <==== oops
> 23: 7f 1b jg 0x40
> 25: 8d 50 04 lea 0x4(%eax),%edx
> 28: 8b 40 04 mov 0x4(%eax),%eax
> 2b: 85 c0 test %eax,%eax
> 2d: 75 f1 jne 0x20
> 2f: 31 c0 xor %eax,%eax
> 31: eb 0d jmp 0x40
>
> static int notifier_chain_register(struct notifier_block **nl,
> struct notifier_block *n)
> {
> while ((*nl) != NULL) {
> if (n->priority > (*nl)->priority) <=== oops
> break;
> nl = &((*nl)->next);
> }
> n->next = *nl;
> rcu_assign_pointer(*nl, n);
> return 0;
> }
>
> notifier_chain_register() is running the existing chain to find the
> place where XFS needs to be inserted, and the existing chain is
> corrupt. Probably not an XFS problem.
I agree. It looks like some module registered a cpu notifier and then
forgot to unregister the notifier block when it was unloaded.
If you add some stack-dump debugging to register_cpu_notifier() and
unregister_cpu_notifier() it ought to be pretty easy to identify the
guilty party.
Alan Stern
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