[Linux-cachefs] Re: cachefiles_read_or_alloc_page crashes

[Derek Siu]

Hi,

In addition, I am using kernel version 2.6.17 and cachefilesd 0.3. I
am not sure if this problem has been fixed yet. Any reply would be
greatly appreciated!

Derek

On 12/10/06, Derek Siu <golf1123 at gmail.com> wrote:
> Hi,
>
> Right after I copy a bunch of files from the NFS server to the client,
> I tried to diff the local files against the files on the server (I
> suppose that it should be "diff"ing the local files against the files
> in the cache instead). It then crashes on
> cachefile_read_or_alloc_page.
>
> Here are the error messages:
>
> Dec 10 16:41:37 GD008 kernel: BUG: unable to handle kernel NULL
> pointer dereference at virtual address 0000002c
> Dec 10 16:41:37 GD008 kernel:  printing eip:
> Dec 10 16:41:37 GD008 kernel: e006ee6a
> Dec 10 16:41:37 GD008 kernel: *pde = 17948067
> Dec 10 16:41:37 GD008 kernel: Oops: 0000 [#1]
> Dec 10 16:41:37 GD008 kernel: Modules linked in: server test
> snd_intel8x0 snd_ac97_codec snd_ac97_bus snd_seq_dummy snd_seq_oss
> snd_seq_midi_event snd_seq snd_seq_device snd_pcm_oss snd_mixer_oss
> snd_pcm ehci_hcd uhci_hcd snd_timer snd i2c_i810 soundcore i2c_i801
> i2c_algo_bit snd_page_alloc i2c_core 8139too e1000 pcnet32 b44 tg3
> e100 3c59x mii ext3 jbd nfs cachefiles fscache lockd nfs_acl sunrpc
> Dec 10 16:41:37 GD008 kernel: CPU:    0
> Dec 10 16:41:37 GD008 kernel: EIP:    0060:[<e006ee6a>]    Not tainted VLI
> Dec 10 16:41:37 GD008 kernel: EFLAGS: 00010246   (2.6.17-rc6 #146)
> Dec 10 16:41:37 GD008 kernel: EIP is at
> cachefiles_read_or_alloc_page+0x3cb/0x483 [cachefiles]
> Dec 10 16:41:37 GD008 kernel: eax: 00000000   ebx: dd10f180   ecx:
> dd10db00   edx: c10c0480
> Dec 10 16:41:37 GD008 kernel: esi: d34758c0   edi: dd10f180   ebp:
> c10c0480   esp: d850bd40
> Dec 10 16:41:37 GD008 kernel: ds: 007b   es: 007b   ss: 0068
> Dec 10 16:41:37 GD008 kernel: Process diff (pid: 1719,
> threadinfo=d850b000 task=df771a90)
> Dec 10 16:41:37 GD008 kernel: Stack: 00000164 00000000 e013d1a0
> e0147cc9 c12abb00 dd10f180 d0b56080 d850bda0
> Dec 10 16:41:37 GD008 kernel:        dd1ad120 00000000 00000000
> 00000000 c10c0480 d0caf174 d0caf140 00000000
> Dec 10 16:41:37 GD008 kernel:        c6020e40 dd1ad100 00000000
> e0148ccf 00000001 00000001 dd1ad030 00000164
> Dec 10 16:41:37 GD008 kernel: Call Trace:
> Dec 10 16:41:37 GD008 kernel:  <e0147cc9>
> nfs_readpage_from_fscache_complete+0x0/0x36 [nfs]  <e0148ccf>
> nfs_wait_on_requests_locked+0x90/0xa2 [nfs]
> Dec 10 16:41:37 GD008 kernel:  <e0028888>
> __fscache_read_or_alloc_page+0xa8/0xe6 [fscache]  <e0147cc9>
> nfs_readpage_from_fscache_complete+0x0/0x36 [nfs]
> Dec 10 16:41:37 GD008 kernel:  <e0148310> nfs_readpage+0x128/0x604
> [nfs]  <c0138e94> add_to_page_cache_lru+0xd/0x20
> Dec 10 16:41:37 GD008 kernel:  <c0139140>
> do_generic_mapping_read+0x201/0x400  <c0139ac7>
> __generic_file_aio_read+0x148/0x18f
> Dec 10 16:41:37 GD008 kernel:  <c0138a81> file_read_actor+0x0/0xe0
> <c0139b49> generic_file_aio_read+0x3b/0x42
> Dec 10 16:41:37 GD008 kernel:  <c0152317> do_sync_read+0xb8/0xf3
> <c0129383> autoremove_wake_function+0x0/0x2d
> Dec 10 16:41:37 GD008 kernel:  <c015225f> do_sync_read+0x0/0xf3
> <c0152bde> vfs_read+0x9f/0x13e
> Dec 10 16:41:37 GD008 kernel:  <c0152f45> sys_read+0x3c/0x63
> <c01029ef> sysenter_past_esp+0x54/0x75
> Dec 10 16:41:37 GD008 kernel: Code: e8 7f 73 0a e0 31 c9 8b 54 24 7c
> 8b 44 24 10 ff 54 24 0c eb 04 85 ed 74 07 89 e8 e8 39 02 0d e0 8b 5c
> 24 14 8b 44 24 24 8b 4b 18 <8b> 50 2c 8b 41 28 8b 58 2c 85 db 74 05 8b
> 41 34 ff d3 8b 44 24
> Dec 10 16:41:37 GD008 kernel: EIP: [<e006ee6a>]
> cachefiles_read_or_alloc_page+0x3cb/0x483 [cachefiles] SS:ESP
> 0068:d850bd40
>
> Derek
>