Hi, Chris,

(2011/11/04 8:43), Tsutomu Itoh wrote:
> (2011/11/03 20:19), Chris Mason wrote:
>> On Thu, Nov 03, 2011 at 10:25:23AM +0900, Tsutomu Itoh wrote:
>>> In integration-scrub branch, following warning messages were displayed by
>>> running xfstests.
>>>
>>> # btrfs fi sh /dev/sdd4
>>> Label: none  uuid: 8f28d85c-e37c-4c1b-adef-2627ca59be78
>>>         Total devices 2 FS bytes used 31.49MB
>>>         devid    1 size 9.31GB used 9.31GB path /dev/sdd4
>>>         devid    2 size 15.01GB used 9.29GB path /dev/sdc1
>>>
>>> Btrfs Btrfs v0.19
>>> # mount
>>> ...
>>> /dev/sdd4 on /test7 type btrfs (rw,compress=lzo)
>>> #
>>>
>>> Thanks,
>>> Tsutomu
>>>
>>> ====================================================================================
>>>
>>> Nov  3 09:55:18 luna kernel: [  939.732044] device fsid 
>>> 8f28d85c-e37c-4c1b-adef-2627ca59be78 devid 1 transid 20510 /dev/sdd4
>>> Nov  3 09:55:18 luna kernel: [  939.732533] btrfs: use lzo compression
>>> Nov  3 09:55:18 luna kernel: [  939.732536] btrfs: disk space caching is 
>>> enabled
>>> Nov  3 09:55:18 luna kernel: [  939.898190] ------------[ cut here 
>>> ]------------
>>> Nov  3 09:55:18 luna kernel: [  939.898223] WARNING: at 
>>> fs/btrfs/free-space-cache.c:305 io_ctl_map_page+0x29/0x76 [btrfs]()
>>> Nov  3 09:55:18 luna kernel: [  939.898227] Hardware name: PRIMERGY
>>> Nov  3 09:55:18 luna kernel: [  939.898229] Modules linked in: btrfs 
>>> zlib_deflate crc32c libcrc32c nfsd lockd nfs_acl auth_rpcgss autofs4 sunrpc 
>>> 8021q garp stp llc cpufreq_ondemand acpi_cpufreq freq_table mperf 
>>> cachefiles fscache ipv6 ext3 jbd dm_mirror dm_region_hash dm_log dm_mod kvm 
>>> uinput ppdev parport_pc parport sg pcspkr i2c_i801 i2c_core iTCO_wdt 
>>> iTCO_vendor_support tg3 shpchp pci_hotplug i3000_edac edac_core ext4 
>>> mbcache jbd2 crc16 sd_mod crc_t10dif megaraid_sas sr_mod cdrom floppy 
>>> pata_acpi ata_generic ata_piix libata scsi_mod [last unloaded: microcode]
>>> Nov  3 09:55:18 luna kernel: [  939.898291] Pid: 13337, comm: dd Not 
>>> tainted 3.1.0integ-sc+ #1
>>> Nov  3 09:55:18 luna kernel: [  939.898294] Call Trace:
>>> Nov  3 09:55:18 luna kernel: [  939.898303]  [<ffffffff8104b6fe>] 
>>> warn_slowpath_common+0x85/0x9d
>>> Nov  3 09:55:18 luna kernel: [  939.898308]  [<ffffffff8104b730>] 
>>> warn_slowpath_null+0x1a/0x1c
>>> Nov  3 09:55:18 luna kernel: [  939.898328]  [<ffffffffa0477507>] 
>>> io_ctl_map_page+0x29/0x76 [btrfs]
>>> Nov  3 09:55:18 luna kernel: [  939.898349]  [<ffffffffa0477733>] 
>>> io_ctl_check_crc+0x62/0xdd [btrfs]
>>
>> Looks like io_ctl_read_bitmap will call io_ctl_check_crc with a mapped
>> page mapped.  Any chance you're able to reproduce this?
> 
> Yes.
> However, because the panic that David reported occurs, I cannot reproduce
> this problem though I executed xfstests again.

In for-linus branch, I was able to reproduce this problem.
The message log is attached to this mail.

Thanks,
Tsutomu
Nov  7 15:16:28 luna kernel: [ 3010.347454] device fsid 
9880be7d-1b7f-4233-b14d-c6bc37d3d26c devid 1 transid 7775 /dev/sdd4
Nov  7 15:16:28 luna kernel: [ 3010.347954] btrfs: disk space caching is enabled
Nov  7 15:16:28 luna kernel: [ 3010.398732] ------------[ cut here ]------------
Nov  7 15:16:28 luna kernel: [ 3010.398768] WARNING: at 
fs/btrfs/free-space-cache.c:305 io_ctl_map_page+0x29/0x76 [btrfs]()
Nov  7 15:16:28 luna kernel: [ 3010.398772] Hardware name: PRIMERGY            
Nov  7 15:16:28 luna kernel: [ 3010.398774] Modules linked in: nfsd lockd 
nfs_acl auth_rpcgss autofs4 sunrpc 8021q garp stp llc cpufreq_ondemand 
acpi_cpufreq freq_table mperf cachefiles fscache ipv6 btrfs zlib_deflate crc32c 
libcrc32c ext3 jbd dm_mirror dm_region_hash dm_log dm_mod kvm uinput ppdev 
parport_pc parport sg pcspkr i2c_i801 i2c_core iTCO_wdt iTCO_vendor_support tg3 
shpchp pci_hotplug i3000_edac edac_core ext4 mbcache jbd2 crc16 sd_mod 
crc_t10dif megaraid_sas sr_mod cdrom floppy pata_acpi ata_generic ata_piix 
libata scsi_mod [last unloaded: microcode]
Nov  7 15:16:28 luna kernel: [ 3010.398834] Pid: 11742, comm: mkdir Not tainted 
3.1.0mod+ #1
Nov  7 15:16:28 luna kernel: [ 3010.398837] Call Trace:
Nov  7 15:16:28 luna kernel: [ 3010.398846]  [<ffffffff8104b6fe>] 
warn_slowpath_common+0x85/0x9d
Nov  7 15:16:28 luna kernel: [ 3010.398851]  [<ffffffff8104b730>] 
warn_slowpath_null+0x1a/0x1c
Nov  7 15:16:28 luna kernel: [ 3010.398872]  [<ffffffffa03035b0>] 
io_ctl_map_page+0x29/0x76 [btrfs]
Nov  7 15:16:28 luna kernel: [ 3010.398893]  [<ffffffffa0303790>] 
io_ctl_check_crc+0x62/0xd0 [btrfs]
Nov  7 15:16:28 luna kernel: [ 3010.398899]  [<ffffffff811cb564>] ? 
rb_insert_color+0x68/0xe5
Nov  7 15:16:28 luna kernel: [ 3010.398919]  [<ffffffffa0303832>] 
io_ctl_read_bitmap+0x34/0x61 [btrfs]
Nov  7 15:16:28 luna kernel: [ 3010.398941]  [<ffffffffa0303202>] ? 
link_free_space+0x3f/0x54 [btrfs]
Nov  7 15:16:28 luna kernel: [ 3010.398961]  [<ffffffffa030528c>] 
__load_free_space_cache+0x2f1/0x35a [btrfs]
Nov  7 15:16:28 luna kernel: [ 3010.398967]  [<ffffffff8112d21d>] ? 
igrab+0x1d/0x44
Nov  7 15:16:28 luna kernel: [ 3010.398988]  [<ffffffffa030548e>] 
load_free_space_cache+0xca/0x168 [btrfs]
Nov  7 15:16:28 luna kernel: [ 3010.399004]  [<ffffffffa02c7507>] 
cache_block_group+0xa3/0x1f2 [btrfs]
Nov  7 15:16:28 luna kernel: [ 3010.399034]  [<ffffffffa02cabf4>] 
find_free_extent+0x478/0xa48 [btrfs]
Nov  7 15:16:28 luna kernel: [ 3010.399041]  [<ffffffff81014ea2>] ? 
read_tsc+0x9/0x1b
Nov  7 15:16:28 luna kernel: [ 3010.399049]  [<ffffffff810d35bc>] ? 
__lock_page+0x6d/0x6d
Nov  7 15:16:28 luna kernel: [ 3010.399068]  [<ffffffffa02cb279>] 
btrfs_reserve_extent+0xb5/0x1c4 [btrfs]
Nov  7 15:16:28 luna kernel: [ 3010.399076]  [<ffffffff810675a2>] ? 
autoremove_wake_function+0x3d/0x3d
Nov  7 15:16:28 luna kernel: [ 3010.399095]  [<ffffffffa02cb508>] 
btrfs_alloc_free_block+0x180/0x2a8 [btrfs]
Nov  7 15:16:28 luna kernel: [ 3010.399111]  [<ffffffffa02bd3b2>] 
__btrfs_cow_block+0x11d/0x3ba [btrfs]
Nov  7 15:16:28 luna kernel: [ 3010.399136]  [<ffffffffa02ec297>] ? 
map_private_extent_buffer+0xa8/0xe8 [btrfs]
Nov  7 15:16:28 luna kernel: [ 3010.399153]  [<ffffffffa02bdb36>] 
btrfs_cow_block+0x108/0x152 [btrfs]
Nov  7 15:16:28 luna kernel: [ 3010.399170]  [<ffffffffa02bf855>] 
btrfs_search_slot+0x24e/0x6a9 [btrfs]
Nov  7 15:16:28 luna kernel: [ 3010.399187]  [<ffffffffa02bceb4>] ? 
btrfs_free_path+0x2a/0x2f [btrfs]
Nov  7 15:16:28 luna kernel: [ 3010.399204]  [<ffffffffa02c088d>] 
btrfs_insert_empty_items+0x6a/0xbc [btrfs]
Nov  7 15:16:28 luna kernel: [ 3010.399228]  [<ffffffffa02da665>] 
btrfs_new_inode+0x160/0x36d [btrfs]
Nov  7 15:16:28 luna kernel: [ 3010.399250]  [<ffffffffa02d6f00>] ? 
start_transaction+0x200/0x24d [btrfs]
Nov  7 15:16:28 luna kernel: [ 3010.399273]  [<ffffffffa02ddf30>] 
btrfs_mkdir+0xbd/0x1ab [btrfs]
Nov  7 15:16:28 luna kernel: [ 3010.399281]  [<ffffffff81123f61>] 
vfs_mkdir+0x5f/0x9b
Nov  7 15:16:28 luna kernel: [ 3010.399287]  [<ffffffff811262c6>] 
sys_mkdirat+0x6b/0xaa
Nov  7 15:16:28 luna kernel: [ 3010.399294]  [<ffffffff8112631d>] 
sys_mkdir+0x18/0x1a
Nov  7 15:16:28 luna kernel: [ 3010.399301]  [<ffffffff813af4c2>] 
system_call_fastpath+0x16/0x1b
Nov  7 15:16:28 luna kernel: [ 3010.399306] ---[ end trace 3f7da847bea10c5d ]---
Nov  7 15:16:28 luna kernel: [ 3010.399327] btrfs: csum mismatch on free space 
cache
Nov  7 15:16:28 luna kernel: [ 3010.399585] btrfs: failed to load free space 
cache for block group 29360128
...
...
Nov  7 15:32:18 luna kernel: [ 3960.655338] device fsid 
9880be7d-1b7f-4233-b14d-c6bc37d3d26c devid 1 transid 8092 /dev/sdd4
Nov  7 15:32:18 luna kernel: [ 3960.655855] btrfs: disk space caching is enabled
Nov  7 15:32:18 luna kernel: [ 3960.844130] ------------[ cut here ]------------
Nov  7 15:32:18 luna kernel: [ 3960.844168] WARNING: at 
fs/btrfs/free-space-cache.c:305 io_ctl_map_page+0x29/0x76 [btrfs]()
Nov  7 15:32:18 luna kernel: [ 3960.844171] Hardware name: PRIMERGY            
Nov  7 15:32:18 luna kernel: [ 3960.844173] Modules linked in: nfsd lockd 
nfs_acl auth_rpcgss autofs4 sunrpc 8021q garp stp llc cpufreq_ondemand 
acpi_cpufreq freq_table mperf cachefiles fscache ipv6 btrfs zlib_deflate crc32c 
libcrc32c ext3 jbd dm_mirror dm_region_hash dm_log dm_mod kvm uinput ppdev 
parport_pc parport sg pcspkr i2c_i801 i2c_core iTCO_wdt iTCO_vendor_support tg3 
shpchp pci_hotplug i3000_edac edac_core ext4 mbcache jbd2 crc16 sd_mod 
crc_t10dif megaraid_sas sr_mod cdrom floppy pata_acpi ata_generic ata_piix 
libata scsi_mod [last unloaded: microcode]
Nov  7 15:32:18 luna kernel: [ 3960.844233] Pid: 8238, comm: rm Tainted: G      
  W   3.1.0mod+ #1
Nov  7 15:32:18 luna kernel: [ 3960.844236] Call Trace:
Nov  7 15:32:18 luna kernel: [ 3960.844245]  [<ffffffff8104b6fe>] 
warn_slowpath_common+0x85/0x9d
Nov  7 15:32:18 luna kernel: [ 3960.844250]  [<ffffffff8104b730>] 
warn_slowpath_null+0x1a/0x1c
Nov  7 15:32:18 luna kernel: [ 3960.844270]  [<ffffffffa03035b0>] 
io_ctl_map_page+0x29/0x76 [btrfs]
Nov  7 15:32:18 luna kernel: [ 3960.844291]  [<ffffffffa0303790>] 
io_ctl_check_crc+0x62/0xd0 [btrfs]
Nov  7 15:32:18 luna kernel: [ 3960.844312]  [<ffffffffa0303832>] 
io_ctl_read_bitmap+0x34/0x61 [btrfs]
Nov  7 15:32:18 luna kernel: [ 3960.844334]  [<ffffffffa0303202>] ? 
link_free_space+0x3f/0x54 [btrfs]
Nov  7 15:32:18 luna kernel: [ 3960.844354]  [<ffffffffa030528c>] 
__load_free_space_cache+0x2f1/0x35a [btrfs]
Nov  7 15:32:18 luna kernel: [ 3960.844360]  [<ffffffff8112d21d>] ? 
igrab+0x1d/0x44
Nov  7 15:32:18 luna kernel: [ 3960.844380]  [<ffffffffa030548e>] 
load_free_space_cache+0xca/0x168 [btrfs]
Nov  7 15:32:18 luna kernel: [ 3960.844397]  [<ffffffffa02c7507>] 
cache_block_group+0xa3/0x1f2 [btrfs]
Nov  7 15:32:18 luna kernel: [ 3960.844414]  [<ffffffffa02cabf4>] 
find_free_extent+0x478/0xa48 [btrfs]
Nov  7 15:32:18 luna kernel: [ 3960.844432]  [<ffffffffa02cb279>] 
btrfs_reserve_extent+0xb5/0x1c4 [btrfs]
Nov  7 15:32:18 luna kernel: [ 3960.844455]  [<ffffffffa02ec297>] ? 
map_private_extent_buffer+0xa8/0xe8 [btrfs]
Nov  7 15:32:18 luna kernel: [ 3960.844472]  [<ffffffffa02cb508>] 
btrfs_alloc_free_block+0x180/0x2a8 [btrfs]
Nov  7 15:32:18 luna kernel: [ 3960.844477]  [<ffffffff8112d786>] ? 
unlock_new_inode+0x50/0x5a
Nov  7 15:32:18 luna kernel: [ 3960.844492]  [<ffffffffa02bd3b2>] 
__btrfs_cow_block+0x11d/0x3ba [btrfs]
Nov  7 15:32:18 luna kernel: [ 3960.844513]  [<ffffffffa02e0822>] ? 
btrfs_lookup_dentry+0x14f/0x400 [btrfs]
Nov  7 15:32:18 luna kernel: [ 3960.844529]  [<ffffffffa02bdb36>] 
btrfs_cow_block+0x108/0x152 [btrfs]
Nov  7 15:32:18 luna kernel: [ 3960.844544]  [<ffffffffa02bf855>] 
btrfs_search_slot+0x24e/0x6a9 [btrfs]
Nov  7 15:32:18 luna kernel: [ 3960.844549]  [<ffffffff811238c1>] ? 
inode_permission+0xd2/0xde
Nov  7 15:32:18 luna kernel: [ 3960.844564]  [<ffffffffa02c088d>] 
btrfs_insert_empty_items+0x6a/0xbc [btrfs]
Nov  7 15:32:18 luna kernel: [ 3960.844569]  [<ffffffff8110b3c9>] ? 
kmem_cache_alloc+0x31/0xec
Nov  7 15:32:18 luna kernel: [ 3960.844591]  [<ffffffffa02fcef8>] 
btrfs_insert_orphan_item+0x5d/0x75 [btrfs]
Nov  7 15:32:18 luna kernel: [ 3960.844614]  [<ffffffffa02de8f1>] 
btrfs_orphan_add+0x107/0x125 [btrfs]
Nov  7 15:32:18 luna kernel: [ 3960.844635]  [<ffffffffa02deeea>] 
btrfs_rmdir+0xb7/0x120 [btrfs]
Nov  7 15:32:18 luna kernel: [ 3960.844640]  [<ffffffff8112436b>] 
vfs_rmdir+0x87/0xe1
Nov  7 15:32:18 luna kernel: [ 3960.844644]  [<ffffffff811269f6>] 
do_rmdir+0xd0/0x122
Nov  7 15:32:18 luna kernel: [ 3960.844649]  [<ffffffff81132266>] ? 
mntput+0x26/0x28
Nov  7 15:32:18 luna kernel: [ 3960.844653]  [<ffffffff81122c69>] ? 
path_put+0x22/0x26
Nov  7 15:32:18 luna kernel: [ 3960.844658]  [<ffffffff810971b7>] ? 
audit_syscall_entry+0x11e/0x14a
Nov  7 15:32:18 luna kernel: [ 3960.844662]  [<ffffffff81126a6a>] 
sys_unlinkat+0x22/0x2b
Nov  7 15:32:18 luna kernel: [ 3960.844667]  [<ffffffff813af4c2>] 
system_call_fastpath+0x16/0x1b
Nov  7 15:32:18 luna kernel: [ 3960.844671] ---[ end trace 3f7da847bea10c5e ]---
Nov  7 15:32:18 luna kernel: [ 3960.844692] btrfs: csum mismatch on free space 
cache
Nov  7 15:32:18 luna kernel: [ 3960.844951] btrfs: failed to load free space 
cache for block group 29360128
...
...
Nov  7 15:49:44 luna kernel: [ 5006.897832] device fsid 
9880be7d-1b7f-4233-b14d-c6bc37d3d26c devid 1 transid 11042 /dev/sdd4
Nov  7 15:49:44 luna kernel: [ 5006.898379] btrfs: use lzo compression
Nov  7 15:49:44 luna kernel: [ 5006.898382] btrfs: disk space caching is enabled
Nov  7 15:49:44 luna kernel: [ 5007.077857] ------------[ cut here ]------------
Nov  7 15:49:44 luna kernel: [ 5007.077893] WARNING: at 
fs/btrfs/free-space-cache.c:305 io_ctl_map_page+0x29/0x76 [btrfs]()
Nov  7 15:49:44 luna kernel: [ 5007.077897] Hardware name: PRIMERGY            
Nov  7 15:49:44 luna kernel: [ 5007.077899] Modules linked in: nfsd lockd 
nfs_acl auth_rpcgss autofs4 sunrpc 8021q garp stp llc cpufreq_ondemand 
acpi_cpufreq freq_table mperf cachefiles fscache ipv6 btrfs zlib_deflate crc32c 
libcrc32c ext3 jbd dm_mirror dm_region_hash dm_log dm_mod kvm uinput ppdev 
parport_pc parport sg pcspkr i2c_i801 i2c_core iTCO_wdt iTCO_vendor_support tg3 
shpchp pci_hotplug i3000_edac edac_core ext4 mbcache jbd2 crc16 sd_mod 
crc_t10dif megaraid_sas sr_mod cdrom floppy pata_acpi ata_generic ata_piix 
libata scsi_mod [last unloaded: microcode]
Nov  7 15:49:44 luna kernel: [ 5007.077959] Pid: 19907, comm: xfs_io Tainted: G 
       W   3.1.0mod+ #1
Nov  7 15:49:44 luna kernel: [ 5007.077962] Call Trace:
Nov  7 15:49:44 luna kernel: [ 5007.077971]  [<ffffffff8104b6fe>] 
warn_slowpath_common+0x85/0x9d
Nov  7 15:49:44 luna kernel: [ 5007.077976]  [<ffffffff8104b730>] 
warn_slowpath_null+0x1a/0x1c
Nov  7 15:49:44 luna kernel: [ 5007.077997]  [<ffffffffa03035b0>] 
io_ctl_map_page+0x29/0x76 [btrfs]
Nov  7 15:49:44 luna kernel: [ 5007.078029]  [<ffffffffa0303790>] 
io_ctl_check_crc+0x62/0xd0 [btrfs]
Nov  7 15:49:44 luna kernel: [ 5007.078052]  [<ffffffffa0303832>] 
io_ctl_read_bitmap+0x34/0x61 [btrfs]
Nov  7 15:49:44 luna kernel: [ 5007.078076]  [<ffffffffa0303202>] ? 
link_free_space+0x3f/0x54 [btrfs]
Nov  7 15:49:44 luna kernel: [ 5007.078099]  [<ffffffffa030528c>] 
__load_free_space_cache+0x2f1/0x35a [btrfs]
Nov  7 15:49:44 luna kernel: [ 5007.078107]  [<ffffffff8112d21d>] ? 
igrab+0x1d/0x44
Nov  7 15:49:44 luna kernel: [ 5007.078129]  [<ffffffffa030548e>] 
load_free_space_cache+0xca/0x168 [btrfs]
Nov  7 15:49:44 luna kernel: [ 5007.078136]  [<ffffffff8111688b>] ? 
lookup_page_cgroup+0x28/0x3e
Nov  7 15:49:44 luna kernel: [ 5007.078154]  [<ffffffffa02c7507>] 
cache_block_group+0xa3/0x1f2 [btrfs]
Nov  7 15:49:44 luna kernel: [ 5007.078174]  [<ffffffffa02cabf4>] 
find_free_extent+0x478/0xa48 [btrfs]
Nov  7 15:49:44 luna kernel: [ 5007.078193]  [<ffffffffa02cb279>] 
btrfs_reserve_extent+0xb5/0x1c4 [btrfs]
Nov  7 15:49:44 luna kernel: [ 5007.078212]  [<ffffffffa02cb508>] 
btrfs_alloc_free_block+0x180/0x2a8 [btrfs]
Nov  7 15:49:44 luna kernel: [ 5007.078229]  [<ffffffffa02bd3b2>] 
__btrfs_cow_block+0x11d/0x3ba [btrfs]
Nov  7 15:49:44 luna kernel: [ 5007.078254]  [<ffffffffa02ec297>] ? 
map_private_extent_buffer+0xa8/0xe8 [btrfs]
Nov  7 15:49:44 luna kernel: [ 5007.078271]  [<ffffffffa02bdb36>] 
btrfs_cow_block+0x108/0x152 [btrfs]
Nov  7 15:49:44 luna kernel: [ 5007.078288]  [<ffffffffa02bf855>] 
btrfs_search_slot+0x24e/0x6a9 [btrfs]
Nov  7 15:49:44 luna kernel: [ 5007.078295]  [<ffffffff8110946c>] ? 
virt_to_head_page+0xe/0x31
Nov  7 15:49:44 luna kernel: [ 5007.078311]  [<ffffffffa02bceb4>] ? 
btrfs_free_path+0x2a/0x2f [btrfs]
Nov  7 15:49:44 luna kernel: [ 5007.078328]  [<ffffffffa02c088d>] 
btrfs_insert_empty_items+0x6a/0xbc [btrfs]
Nov  7 15:49:44 luna kernel: [ 5007.078352]  [<ffffffffa02da665>] 
btrfs_new_inode+0x160/0x36d [btrfs]
Nov  7 15:49:44 luna kernel: [ 5007.078374]  [<ffffffffa02d6f00>] ? 
start_transaction+0x200/0x24d [btrfs]
Nov  7 15:49:44 luna kernel: [ 5007.078397]  [<ffffffffa02dd710>] 
btrfs_create+0xae/0x19a [btrfs]
Nov  7 15:49:44 luna kernel: [ 5007.078405]  [<ffffffff811240c8>] 
vfs_create+0x6c/0x8e
Nov  7 15:49:44 luna kernel: [ 5007.078411]  [<ffffffff81124f3e>] 
do_last+0x237/0x57a
Nov  7 15:49:44 luna kernel: [ 5007.078417]  [<ffffffff81125809>] 
path_openat+0xcf/0x313
Nov  7 15:49:44 luna kernel: [ 5007.078424]  [<ffffffff81125b46>] 
do_filp_open+0x3d/0x89
Nov  7 15:49:44 luna kernel: [ 5007.078431]  [<ffffffff811d149e>] ? 
strncpy_from_user+0x48/0x76
Nov  7 15:49:44 luna kernel: [ 5007.078438]  [<ffffffff8112fc9b>] ? 
alloc_fd+0x7b/0x123
Nov  7 15:49:44 luna kernel: [ 5007.078445]  [<ffffffff8111877f>] 
do_sys_open+0x73/0x105
Nov  7 15:49:44 luna kernel: [ 5007.078451]  [<ffffffff81118844>] 
sys_open+0x20/0x22
Nov  7 15:49:44 luna kernel: [ 5007.078458]  [<ffffffff813af4c2>] 
system_call_fastpath+0x16/0x1b
Nov  7 15:49:44 luna kernel: [ 5007.078463] ---[ end trace 3f7da847bea10c5f ]---
Nov  7 15:49:44 luna kernel: [ 5007.078485] btrfs: csum mismatch on free space 
cache
Nov  7 15:49:44 luna kernel: [ 5007.079315] btrfs: failed to load free space 
cache for block group 29360128
...
...
Nov  7 16:20:16 luna kernel: [ 6838.353069] device fsid 
9880be7d-1b7f-4233-b14d-c6bc37d3d26c devid 1 transid 14139 /dev/sdd4
Nov  7 16:20:16 luna kernel: [ 6838.353590] btrfs: use lzo compression
Nov  7 16:20:16 luna kernel: [ 6838.353593] btrfs: disk space caching is enabled
Nov  7 16:20:16 luna kernel: [ 6838.494401] ------------[ cut here ]------------
Nov  7 16:20:16 luna kernel: [ 6838.494438] WARNING: at 
fs/btrfs/free-space-cache.c:305 io_ctl_map_page+0x29/0x76 [btrfs]()
Nov  7 16:20:16 luna kernel: [ 6838.494441] Hardware name: PRIMERGY            
Nov  7 16:20:16 luna kernel: [ 6838.494444] Modules linked in: nfsd lockd 
nfs_acl auth_rpcgss autofs4 sunrpc 8021q garp stp llc cpufreq_ondemand 
acpi_cpufreq freq_table mperf cachefiles fscache ipv6 btrfs zlib_deflate crc32c 
libcrc32c ext3 jbd dm_mirror dm_region_hash dm_log dm_mod kvm uinput ppdev 
parport_pc parport sg pcspkr i2c_i801 i2c_core iTCO_wdt iTCO_vendor_support tg3 
shpchp pci_hotplug i3000_edac edac_core ext4 mbcache jbd2 crc16 sd_mod 
crc_t10dif megaraid_sas sr_mod cdrom floppy pata_acpi ata_generic ata_piix 
libata scsi_mod [last unloaded: microcode]
Nov  7 16:20:16 luna kernel: [ 6838.494504] Pid: 20575, comm: touch Tainted: G  
      W   3.1.0mod+ #1
Nov  7 16:20:16 luna kernel: [ 6838.494507] Call Trace:
Nov  7 16:20:16 luna kernel: [ 6838.494516]  [<ffffffff8104b6fe>] 
warn_slowpath_common+0x85/0x9d
Nov  7 16:20:16 luna kernel: [ 6838.494521]  [<ffffffff8104b730>] 
warn_slowpath_null+0x1a/0x1c
Nov  7 16:20:16 luna kernel: [ 6838.494542]  [<ffffffffa03035b0>] 
io_ctl_map_page+0x29/0x76 [btrfs]
Nov  7 16:20:16 luna kernel: [ 6838.494563]  [<ffffffffa0303790>] 
io_ctl_check_crc+0x62/0xd0 [btrfs]
Nov  7 16:20:16 luna kernel: [ 6838.494569]  [<ffffffff811cb564>] ? 
rb_insert_color+0x68/0xe5
Nov  7 16:20:16 luna kernel: [ 6838.494590]  [<ffffffffa0303832>] 
io_ctl_read_bitmap+0x34/0x61 [btrfs]
Nov  7 16:20:16 luna kernel: [ 6838.494611]  [<ffffffffa0303202>] ? 
link_free_space+0x3f/0x54 [btrfs]
Nov  7 16:20:16 luna kernel: [ 6838.494632]  [<ffffffffa030528c>] 
__load_free_space_cache+0x2f1/0x35a [btrfs]
Nov  7 16:20:16 luna kernel: [ 6838.494638]  [<ffffffff8112d21d>] ? 
igrab+0x1d/0x44
Nov  7 16:20:16 luna kernel: [ 6838.494658]  [<ffffffffa030548e>] 
load_free_space_cache+0xca/0x168 [btrfs]
Nov  7 16:20:16 luna kernel: [ 6838.494663]  [<ffffffff8110b3c9>] ? 
kmem_cache_alloc+0x31/0xec
Nov  7 16:20:16 luna kernel: [ 6838.494680]  [<ffffffffa02c7507>] 
cache_block_group+0xa3/0x1f2 [btrfs]
Nov  7 16:20:16 luna kernel: [ 6838.494697]  [<ffffffffa02cabf4>] 
find_free_extent+0x478/0xa48 [btrfs]
Nov  7 16:20:16 luna kernel: [ 6838.494715]  [<ffffffffa02cb279>] 
btrfs_reserve_extent+0xb5/0x1c4 [btrfs]
Nov  7 16:20:16 luna kernel: [ 6838.494732]  [<ffffffffa02cb508>] 
btrfs_alloc_free_block+0x180/0x2a8 [btrfs]
Nov  7 16:20:16 luna kernel: [ 6838.494747]  [<ffffffffa02bd3b2>] 
__btrfs_cow_block+0x11d/0x3ba [btrfs]
Nov  7 16:20:16 luna kernel: [ 6838.494770]  [<ffffffffa02ec297>] ? 
map_private_extent_buffer+0xa8/0xe8 [btrfs]
Nov  7 16:20:16 luna kernel: [ 6838.494785]  [<ffffffffa02bdb36>] 
btrfs_cow_block+0x108/0x152 [btrfs]
Nov  7 16:20:16 luna kernel: [ 6838.494800]  [<ffffffffa02bf855>] 
btrfs_search_slot+0x24e/0x6a9 [btrfs]
Nov  7 16:20:16 luna kernel: [ 6838.494805]  [<ffffffff8110946c>] ? 
virt_to_head_page+0xe/0x31
Nov  7 16:20:16 luna kernel: [ 6838.494820]  [<ffffffffa02bceb4>] ? 
btrfs_free_path+0x2a/0x2f [btrfs]
Nov  7 16:20:16 luna kernel: [ 6838.494835]  [<ffffffffa02c088d>] 
btrfs_insert_empty_items+0x6a/0xbc [btrfs]
Nov  7 16:20:16 luna kernel: [ 6838.494857]  [<ffffffffa02da665>] 
btrfs_new_inode+0x160/0x36d [btrfs]
Nov  7 16:20:16 luna kernel: [ 6838.494877]  [<ffffffffa02d6f00>] ? 
start_transaction+0x200/0x24d [btrfs]
Nov  7 16:20:16 luna kernel: [ 6838.494898]  [<ffffffffa02dd710>] 
btrfs_create+0xae/0x19a [btrfs]
Nov  7 16:20:16 luna kernel: [ 6838.494904]  [<ffffffff811240c8>] 
vfs_create+0x6c/0x8e
Nov  7 16:20:16 luna kernel: [ 6838.494908]  [<ffffffff81124f3e>] 
do_last+0x237/0x57a
Nov  7 16:20:16 luna kernel: [ 6838.494912]  [<ffffffff81125809>] 
path_openat+0xcf/0x313
Nov  7 16:20:16 luna kernel: [ 6838.494917]  [<ffffffff81125b46>] 
do_filp_open+0x3d/0x89
Nov  7 16:20:16 luna kernel: [ 6838.494922]  [<ffffffff811d149e>] ? 
strncpy_from_user+0x48/0x76
Nov  7 16:20:16 luna kernel: [ 6838.494927]  [<ffffffff8112fc9b>] ? 
alloc_fd+0x7b/0x123
Nov  7 16:20:16 luna kernel: [ 6838.494932]  [<ffffffff8111877f>] 
do_sys_open+0x73/0x105
Nov  7 16:20:16 luna kernel: [ 6838.494936]  [<ffffffff81118844>] 
sys_open+0x20/0x22
Nov  7 16:20:16 luna kernel: [ 6838.494941]  [<ffffffff813af4c2>] 
system_call_fastpath+0x16/0x1b
Nov  7 16:20:16 luna kernel: [ 6838.494945] ---[ end trace 3f7da847bea10c60 ]---
Nov  7 16:20:16 luna kernel: [ 6838.495117] btrfs: csum mismatch on free space 
cache
Nov  7 16:20:16 luna kernel: [ 6838.495374] btrfs: failed to load free space 
cache for block group 29360128

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