[Bug 442846] [NEW] FS-Cache: Cache cachefiles stopped due to I/O error

[Wido den Hollander]

Public bug reported:

Binary package hint: cachefilesd

Hello,

In #440522 i reported that NFS and AFS modules were not compiled into
the kernel, so caching NFS was not possible with cachefilesd.

I build my own kernel on the Ubuntu sources with these modules enabled
and started testing.

The modules load fine and everything seems OK until the caching starts,
this is what comes up in the dmesg.

[   25.181971] FS-Cache: Loaded
[   25.409818] FS-Cache: Netfs 'nfs' registered for caching
[   25.420518] svc: failed to register lockdv1 RPC service (errno 97).
[   27.817621] CacheFiles: Loaded
[   27.844771] FS-Cache: Cache "mycache" added (type cachefiles)
[   27.844776] CacheFiles: File cache on sda1 registered
---------------------------------------------------------------------------
[  328.007073] Pid: 2613, comm: kslowd Tainted: P           2.6.31.1-nfs-fscache #1
[  328.007077] Call Trace:
[  328.007090]  [<ffffffffa0c6cc9d>] cachefiles_read_waiter+0xcd/0x120 [cachefiles]
[  328.007097]  [<ffffffff8103fa19>] __wake_up_common+0x59/0x90
[  328.007101]  [<ffffffff81043813>] __wake_up+0x43/0x70
[  328.007105]  [<ffffffff81071c4c>] __wake_up_bit+0x2c/0x30
[  328.007110]  [<ffffffff810d2c72>] unlock_page+0x22/0x30
[  328.007114]  [<ffffffff811867d6>] ext3_truncate+0x2c6/0x9f0
[  328.007117]  [<ffffffff8113b907>] ? __getblk+0x27/0x2f0
[  328.007120]  [<ffffffff8104381e>] ? __wake_up+0x4e/0x70
[  328.007124]  [<ffffffff810eed58>] vmtruncate+0xa8/0x110
[  328.007128]  [<ffffffff8112c660>] inode_setattr+0x30/0x170
[  328.007131]  [<ffffffff81184cff>] ext3_setattr+0xff/0x210
[  328.007134]  [<ffffffff8112c903>] notify_change+0x163/0x340
[  328.007139]  [<ffffffffa0c6b1b9>] cachefiles_attr_changed+0xd9/0x170 [cachefiles]
[  328.007145]  [<ffffffffa0c6c307>] ? cachefiles_walk_to_object+0x427/0x790 [cachefiles]
[  328.007150]  [<ffffffffa0c6b308>] cachefiles_lookup_object+0xb8/0xf0 [cachefiles]
[  328.007158]  [<ffffffffa0bf64a1>] fscache_lookup_object+0x81/0x150 [fscache]
[  328.007164]  [<ffffffffa0bf6ef5>] fscache_object_slow_work_execute+0x595/0x8b0 [fscache]
[  328.007168]  [<ffffffff810ca933>] slow_work_thread+0x353/0x4e0
[  328.007171]  [<ffffffff81071c90>] ? autoremove_wake_function+0x0/0x40
[  328.007174]  [<ffffffff810ca5e0>] ? slow_work_thread+0x0/0x4e0
[  328.007177]  [<ffffffff810718a6>] kthread+0xa6/0xb0
[  328.007181]  [<ffffffff81012f8a>] child_rip+0xa/0x20
[  328.007184]  [<ffffffff81071800>] ? kthread+0x0/0xb0
[  328.007186]  [<ffffffff81012f80>] ? child_rip+0x0/0x20
[  328.007201] CacheFiles: I/O Error: Readpage failed on backing file 100000000000810
[  328.007204] FS-Cache: Cache cachefiles stopped due to I/O error

Some searching on Google lead me to this recent mailinglist post:
http://lkml.indiana.edu/hypermail/linux/kernel/0906.2/01563.html

It seems there is a patch to fix this issue, i haven't tried it myself
yet, but i will try shortly to find out wether this works.

** Affects: cachefilesd (Ubuntu)
     Importance: Undecided
         Status: New

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FS-Cache: Cache cachefiles stopped due to I/O error
https://bugs.launchpad.net/bugs/442846
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