Ceph

I just tried to load a RBD image with the RBD module in 2.6.37 (final), I added the device with:

echo "[2a00:f10:113:1:230:48ff:fe8d:a21e] name=admin,secret=AQCUozFNuPWFDRAAtkyjn1qva4Orff3fOetI0w== rbd alpha" > add

This went fine, but a /dev/rbd0 device did not appear.

/sys/bus/rbd/devices/0 is created, but is seems to be a bit weird:

root@noisy:/sys/bus/rbd/devices/0# ls
client_id  create_snap  current_snap  major  name  pool  power  refresh  rollback_snap  size  subsystem  uevent
root@noisy:/sys/bus/rbd/devices/0# cat name
Segmentation fault
root@noisy:/sys/bus/rbd/devices/0# cat pool
Segmentation fault
root@noisy:/sys/bus/rbd/devices/0#

I then tried to remove the device:

root@noisy:~# echo 0 > /sys/bus/rbd/remove 
-bash: echo: write error: No such file or directory
root@noisy:~# 

I then removed the "rbd" module and probed it again, my dmesg then displayed:

[28673.697880] ------------[ cut here ]------------
[28673.705055] WARNING: at /build/buildd/linux-lts-backport-natty-2.6.37/fs/sysfs/dir.c:451 sysfs_add_one+0xce/0x150()
[28673.712409] Hardware name: X7DVL
[28673.719736] sysfs: cannot create duplicate filename '/bus/rbd'
[28673.727200] Modules linked in: rbd(+) cryptd aes_x86_64 aes_generic libceph btrfs zlib_deflate libcrc32c ip6table_filter ip6_tables ipt_MASQUERADE iptable_nat nf_nat nf_conntrack_ipv4 nf_defrag_ipv4 xt_state nf_conntrack ipt_REJECT xt_tcpudp iptable_filter ip_tables x_tables kvm_intel kvm radeon ttm bridge drm_kms_helper i5000_edac drm stp edac_core ioatdma i5k_amb ppdev i2c_algo_bit ghes shpchp serio_raw dca parport_pc joydev hed lp parport usbhid hid e1000e ahci libahci [last unloaded: rbd]
[28673.760424] Pid: 8568, comm: modprobe Tainted: G      D W   2.6.37-12-server #26~lucid1-Ubuntu
[28673.768936] Call Trace:
[28673.777509]  [<ffffffff8106446f>] warn_slowpath_common+0x7f/0xc0
[28673.786174]  [<ffffffff81064566>] warn_slowpath_fmt+0x46/0x50
[28673.794829]  [<ffffffff811d355e>] sysfs_add_one+0xce/0x150
[28673.803325]  [<ffffffff811d3661>] create_dir+0x81/0xd0
[28673.811549]  [<ffffffff811d372d>] sysfs_create_dir+0x7d/0xd0
[28673.819703]  [<ffffffff812d76b7>] kobject_add_internal+0xb7/0x200
[28673.827874]  [<ffffffff812d782f>] kset_register+0x2f/0x60
[28673.836012]  [<ffffffff813ac066>] bus_register+0x116/0x2a0
[28673.844148]  [<ffffffffa004e000>] ? init_module+0x0/0x1000 [rbd]
[28673.852296]  [<ffffffffa004e020>] init_module+0x20/0x1000 [rbd]
[28673.860427]  [<ffffffff81002053>] do_one_initcall+0x43/0x190
[28673.868290]  [<ffffffff810a2abb>] sys_init_module+0xfb/0x250
[28673.876025]  [<ffffffff8100c102>] system_call_fastpath+0x16/0x1b
[28673.883527] ---[ end trace b5ec29a370a26a7b ]---
[28673.890756] kobject_add_internal failed for rbd with -EEXIST, don't try to register things with the same name in the same directory.
[28673.898165] Pid: 8568, comm: modprobe Tainted: G      D W   2.6.37-12-server #26~lucid1-Ubuntu
[28673.905625] Call Trace:
[28673.913028]  [<ffffffff812d775d>] kobject_add_internal+0x15d/0x200
[28673.920472]  [<ffffffff812d782f>] kset_register+0x2f/0x60
[28673.927853]  [<ffffffff813ac066>] bus_register+0x116/0x2a0
[28673.935259]  [<ffffffffa004e000>] ? init_module+0x0/0x1000 [rbd]
[28673.942651]  [<ffffffffa004e020>] init_module+0x20/0x1000 [rbd]
[28673.949987]  [<ffffffff81002053>] do_one_initcall+0x43/0x190
[28673.957322]  [<ffffffff810a2abb>] sys_init_module+0xfb/0x250
[28673.964583]  [<ffffffff8100c102>] system_call_fastpath+0x16/0x1b

Right now I'm stuck, removing the rbd module doesn't clean everything up, but probing it again doesn't work either.

Other messages I saw in my dmesg during this process:

[28327.041656] libceph: client4309 fsid 99e7bd81-4f90-1e65-defa-70a04f5454b0
[28327.041726] libceph: mon0 [2a00:f10:113:1:230:48ff:fe8d:a21e]:6789 session established
[28327.041740] ------------[ cut here ]------------
[28327.041750] WARNING: at /build/buildd/linux-lts-backport-natty-2.6.37/fs/sysfs/dir.c:451 sysfs_add_one+0xce/0x150()
[28327.041754] Hardware name: X7DVL
[28327.041757] sysfs: cannot create duplicate filename '/devices/rbd/0'
[28327.041759] Modules linked in: cryptd aes_x86_64 aes_generic rbd libceph btrfs zlib_deflate libcrc32c ip6table_filter ip6_tables ipt_MASQUERADE iptable_nat nf_nat nf_conntrack_ipv4 nf_defrag_ipv4 xt_state nf_conntrack ipt_REJECT xt_tcpudp iptable_filter ip_tables x_tables kvm_intel kvm radeon ttm bridge drm_kms_helper i5000_edac drm stp edac_core ioatdma i5k_amb ppdev i2c_algo_bit ghes shpchp serio_raw dca parport_pc joydev hed lp parport usbhid hid e1000e ahci libahci
[28327.041815] Pid: 8122, comm: bash Tainted: G        W   2.6.37-12-server #26~lucid1-Ubuntu
[28327.041818] Call Trace:
[28327.041829]  [<ffffffff8106446f>] warn_slowpath_common+0x7f/0xc0
[28327.041834]  [<ffffffff81064566>] warn_slowpath_fmt+0x46/0x50
[28327.041838]  [<ffffffff811d355e>] sysfs_add_one+0xce/0x150
[28327.041843]  [<ffffffff811d3661>] create_dir+0x81/0xd0
[28327.041847]  [<ffffffff811d372d>] sysfs_create_dir+0x7d/0xd0
[28327.041854]  [<ffffffff812d76b7>] kobject_add_internal+0xb7/0x200
[28327.041859]  [<ffffffff812d7918>] kobject_add_varg+0x38/0x60
[28327.041863]  [<ffffffff812d79f4>] kobject_add+0x44/0x70
[28327.041868]  [<ffffffff812d74da>] ? kobject_get+0x1a/0x30
[28327.041875]  [<ffffffff813a9a4b>] device_add+0xcb/0x4d0
[28327.041879]  [<ffffffff813a9e6e>] device_register+0x1e/0x30
[28327.041886]  [<ffffffffa03c3441>] rbd_bus_add_dev+0x71/0x130 [rbd]
[28327.041892]  [<ffffffffa03c5dcf>] rbd_add+0x2bf/0x4d0 [rbd]
[28327.041897]  [<ffffffff813aae07>] bus_attr_store+0x27/0x30
[28327.041901]  [<ffffffff811d1725>] sysfs_write_file+0xe5/0x170
[28327.041907]  [<ffffffff811629e8>] vfs_write+0xc8/0x190
[28327.041910]  [<ffffffff81163191>] sys_write+0x51/0x80
[28327.041917]  [<ffffffff8100c102>] system_call_fastpath+0x16/0x1b
[28327.041920] ---[ end trace b5ec29a370a26a75 ]---
[28327.041925] kobject_add_internal failed for 0 with -EEXIST, don't try to register things with the same name in the same directory.
[28327.042111] Pid: 8122, comm: bash Tainted: G        W   2.6.37-12-server #26~lucid1-Ubuntu
[28327.042114] Call Trace:
[28327.042118]  [<ffffffff812d775d>] kobject_add_internal+0x15d/0x200
[28327.042123]  [<ffffffff812d7918>] kobject_add_varg+0x38/0x60
[28327.042128]  [<ffffffff812d79f4>] kobject_add+0x44/0x70
[28327.042132]  [<ffffffff812d74da>] ? kobject_get+0x1a/0x30
[28327.042136]  [<ffffffff813a9a4b>] device_add+0xcb/0x4d0
[28327.042140]  [<ffffffff813a9e6e>] device_register+0x1e/0x30
[28327.042145]  [<ffffffffa03c3441>] rbd_bus_add_dev+0x71/0x130 [rbd]
[28327.042150]  [<ffffffffa03c5dcf>] rbd_add+0x2bf/0x4d0 [rbd]
[28327.042155]  [<ffffffff813aae07>] bus_attr_store+0x27/0x30
[28327.042159]  [<ffffffff811d1725>] sysfs_write_file+0xe5/0x170
[28327.042163]  [<ffffffff811629e8>] vfs_write+0xc8/0x190
[28327.042167]  [<ffffffff81163191>] sys_write+0x51/0x80
[28327.042172]  [<ffffffff8100c102>] system_call_fastpath+0x16/0x1b
[28526.321981] ------------[ cut here ]------------
[28526.321994] WARNING: at /build/buildd/linux-lts-backport-natty-2.6.37/fs/sysfs/file.c:355 sysfs_open_file+0x1c5/0x220()
[28526.321998] Hardware name: X7DVL
[28526.322000] missing sysfs attribute operations for kobject: (null)
[28526.322104] Modules linked in: cryptd aes_x86_64 aes_generic rbd libceph btrfs zlib_deflate libcrc32c ip6table_filter ip6_tables ipt_MASQUERADE iptable_nat nf_nat nf_conntrack_ipv4 nf_defrag_ipv4 xt_state nf_conntrack ipt_REJECT xt_tcpudp iptable_filter ip_tables x_tables kvm_intel kvm radeon ttm bridge drm_kms_helper i5000_edac drm stp edac_core ioatdma i5k_amb ppdev i2c_algo_bit ghes shpchp serio_raw dca parport_pc joydev hed lp parport usbhid hid e1000e ahci libahci
[28526.322161] Pid: 8494, comm: cat Tainted: G        W   2.6.37-12-server #26~lucid1-Ubuntu
[28526.322164] Call Trace:
[28526.322175]  [<ffffffff8106446f>] warn_slowpath_common+0x7f/0xc0
[28526.322180]  [<ffffffff81064566>] warn_slowpath_fmt+0x46/0x50
[28526.322185]  [<ffffffff811d24d5>] sysfs_open_file+0x1c5/0x220
[28526.322189]  [<ffffffff811d2310>] ? sysfs_open_file+0x0/0x220
[28526.322195]  [<ffffffff81160eb7>] __dentry_open+0xe7/0x330
[28526.322199]  [<ffffffff811d0e76>] ? sysfs_permission+0x56/0x70
[28526.322203]  [<ffffffff81161221>] nameidata_to_filp+0x61/0x70
[28526.322208]  [<ffffffff8116e888>] finish_open+0xe8/0x1d0
[28526.322213]  [<ffffffff811769ef>] ? dput+0x8f/0x160
[28526.322217]  [<ffffffff8116f906>] do_last+0x86/0x420
[28526.322221]  [<ffffffff81171a13>] do_filp_open+0x203/0x5f0
[28526.322228]  [<ffffffff8112fc39>] ? handle_mm_fault+0x1b9/0x420
[28526.322232]  [<ffffffff81135605>] ? mmap_region+0x255/0x5a0
[28526.322238]  [<ffffffff812ad220>] ? apparmor_inode_getattr+0x60/0x70
[28526.322243]  [<ffffffff8117d1fa>] ? alloc_fd+0x10a/0x150
[28526.322249]  [<ffffffff81160c79>] do_sys_open+0x69/0x150
[28526.322252]  [<ffffffff81160da0>] sys_open+0x20/0x30
[28526.322259]  [<ffffffff8100c102>] system_call_fastpath+0x16/0x1b
[28526.322262] ---[ end trace b5ec29a370a26a76 ]---
[28530.022010] general protection fault: 0000 [#1] SMP 
[28530.022108] last sysfs file: /sys/devices/rbd/0/name
[28530.022193] CPU 0 
[28530.022230] Modules linked in: cryptd aes_x86_64 aes_generic rbd libceph btrfs zlib_deflate libcrc32c ip6table_filter ip6_tables ipt_MASQUERADE iptable_nat nf_nat nf_conntrack_ipv4 nf_defrag_ipv4 xt_state nf_conntrack ipt_REJECT xt_tcpudp iptable_filter ip_tables x_tables kvm_intel kvm radeon ttm bridge drm_kms_helper i5000_edac drm stp edac_core ioatdma i5k_amb ppdev i2c_algo_bit ghes shpchp serio_raw dca parport_pc joydev hed lp parport usbhid hid e1000e ahci libahci
[28530.023509] 
[28530.023546] Pid: 8503, comm: cat Tainted: G        W   2.6.37-12-server #26~lucid1-Ubuntu X7DVL/X7DVL
[28530.023676] RIP: 0010:[<ffffffff811d23a8>]  [<ffffffff811d23a8>] sysfs_open_file+0x98/0x220
[28530.023829] RSP: 0018:ffff8800aa347c48  EFLAGS: 00010202
[28530.023911] RAX: 3020202020203020 RBX: ffff88017b9e8900 RCX: ffff8800aa1a9054
[28530.024011] RDX: ffff8800aa1a9050 RSI: 0000000000000001 RDI: ffff8800aa1a9050
[28530.024111] RBP: ffff8800aa347c88 R08: 6462722f73656369 R09: 6462722f73656369
[28530.024211] R10: 00656d616e2f302f R11: 7665642f7379732f R12: ffff8800aa1a9050
[28530.024312] R13: ffffffff81ca90a8 R14: ffff8800aa238238 R15: ffff8800a1996460
[28530.024413] FS:  00007f83d41b9700(0000) GS:ffff8800cfc00000(0000) knlGS:0000000000000000
[28530.024535] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[28530.024615] CR2: 00007f83d3d6d1c0 CR3: 00000000aa1a4000 CR4: 00000000000006f0
[28530.024715] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
[28530.024816] DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000400
[28530.024917] Process cat (pid: 8503, threadinfo ffff8800aa346000, task ffff880100adad80)
[28530.025035] Stack:
[28530.025072]  ffff8800a1996460 ffff8800a19a5240 0000000000000000 ffff88017b9e8900
[28530.025219]  ffff8801a1e2d700 ffff8800a19a5240 ffffffff811d2310 ffff8800a1996460
[28530.025367]  ffff8800aa347ce8 ffffffff81160eb7 ffff8800aa347cc8 ffffffff811d0e76
[28530.025514] Call Trace:
[28530.025557]  [<ffffffff811d2310>] ? sysfs_open_file+0x0/0x220
[28530.025640]  [<ffffffff81160eb7>] __dentry_open+0xe7/0x330
[28530.025729]  [<ffffffff811d0e76>] ? sysfs_permission+0x56/0x70
[28530.025816]  [<ffffffff81161221>] nameidata_to_filp+0x61/0x70
[28530.025898]  [<ffffffff8116e888>] finish_open+0xe8/0x1d0
[28530.025981]  [<ffffffff811769ef>] ? dput+0x8f/0x160
[28530.026063]  [<ffffffff8116f906>] do_last+0x86/0x420
[28530.026148]  [<ffffffff81171a13>] do_filp_open+0x203/0x5f0
[28530.026239]  [<ffffffff8112fc39>] ? handle_mm_fault+0x1b9/0x420
[28530.026329]  [<ffffffff81135605>] ? mmap_region+0x255/0x5a0
[28530.026423]  [<ffffffff812ad220>] ? apparmor_inode_getattr+0x60/0x70
[28530.026529]  [<ffffffff8117d1fa>] ? alloc_fd+0x10a/0x150
[28530.026613]  [<ffffffff81160c79>] do_sys_open+0x69/0x150
[28530.026695]  [<ffffffff81160da0>] sys_open+0x20/0x30
[28530.026783]  [<ffffffff8100c102>] system_call_fastpath+0x16/0x1b
[28530.026874] Code: c0 80 ca 81 e8 ea e5 10 00 4c 89 e7 e8 c2 01 00 00 48 89 c2 b8 ed ff ff ff 48 85 d2 74 3e 49 8b 46 28 48 85 c0 0f 84 10 01 00 00 <4c> 8b 68 08 4d 85 ed 0f 84 03 01 00 00 8b 43 3c a8 02 74 3b 41 
[28530.027658] RIP  [<ffffffff811d23a8>] sysfs_open_file+0x98/0x220
[28530.027766]  RSP <ffff8800aa347c48>
[28530.052788] ---[ end trace b5ec29a370a26a77 ]---
[28559.202246] general protection fault: 0000 [#2] SMP 
[28559.202353] last sysfs file: /sys/devices/rbd/0/name
[28559.202439] CPU 0 
[28559.202480] Modules linked in: cryptd aes_x86_64 aes_generic rbd libceph btrfs zlib_deflate libcrc32c ip6table_filter ip6_tables ipt_MASQUERADE iptable_nat nf_nat nf_conntrack_ipv4 nf_defrag_ipv4 xt_state nf_conntrack ipt_REJECT xt_tcpudp iptable_filter ip_tables x_tables kvm_intel kvm radeon ttm bridge drm_kms_helper i5000_edac drm stp edac_core ioatdma i5k_amb ppdev i2c_algo_bit ghes shpchp serio_raw dca parport_pc joydev hed lp parport usbhid hid e1000e ahci libahci
[28559.203913] 
[28559.203953] Pid: 8513, comm: cat Tainted: G      D W   2.6.37-12-server #26~lucid1-Ubuntu X7DVL/X7DVL
[28559.204089] RIP: 0010:[<ffffffff811d23a8>]  [<ffffffff811d23a8>] sysfs_open_file+0x98/0x220
[28559.210651] RSP: 0018:ffff8800aa661c48  EFLAGS: 00010202
[28559.210651] RAX: 3020202020203020 RBX: ffff88019efd4900 RCX: ffff8800aa1a9054
[28559.210651] RDX: ffff8800aa1a9050 RSI: 0000000000000002 RDI: ffff8800aa1a9050
[28559.210651] RBP: ffff8800aa661c88 R08: 6462722f73656369 R09: 6462722f73656369
[28559.210651] R10: 00656d616e2f302f R11: 7665642f7379732f R12: ffff8800aa1a9050
[28559.210651] R13: ffffffff81ca90a8 R14: ffff8800aa238238 R15: ffff8800a1996460
[28559.210651] FS:  00007f43a1398700(0000) GS:ffff8800cfc00000(0000) knlGS:0000000000000000
[28559.210651] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[28559.210651] CR2: 00007f43a0f4c1c0 CR3: 00000000aa7e6000 CR4: 00000000000006f0
[28559.210651] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
[28559.210651] DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000400
[28559.210651] Process cat (pid: 8513, threadinfo ffff8800aa660000, task ffff880100adc440)
[28559.210651] Stack:
[28559.210651]  ffff8800a1996460 ffff8800a19a5240 0000000000000000 ffff88019efd4900
[28559.210651]  ffff8801a1e2d700 ffff8800a19a5240 ffffffff811d2310 ffff8800a1996460
[28559.210651]  ffff8800aa661ce8 ffffffff81160eb7 ffff8800aa661cc8 ffffffff811d0e76
[28559.210651] Call Trace:
[28559.210651]  [<ffffffff811d2310>] ? sysfs_open_file+0x0/0x220
[28559.210651]  [<ffffffff81160eb7>] __dentry_open+0xe7/0x330
[28559.210651]  [<ffffffff811d0e76>] ? sysfs_permission+0x56/0x70
[28559.210651]  [<ffffffff81161221>] nameidata_to_filp+0x61/0x70
[28559.210651]  [<ffffffff8116e888>] finish_open+0xe8/0x1d0
[28559.210651]  [<ffffffff811769ef>] ? dput+0x8f/0x160
[28559.210651]  [<ffffffff8116f906>] do_last+0x86/0x420
[28559.210651]  [<ffffffff81171a13>] do_filp_open+0x203/0x5f0
[28559.210651]  [<ffffffff8112fc39>] ? handle_mm_fault+0x1b9/0x420
[28559.210651]  [<ffffffff81135605>] ? mmap_region+0x255/0x5a0
[28559.210651]  [<ffffffff812ad220>] ? apparmor_inode_getattr+0x60/0x70
[28559.210651]  [<ffffffff8117d1fa>] ? alloc_fd+0x10a/0x150
[28559.210651]  [<ffffffff81160c79>] do_sys_open+0x69/0x150
[28559.210651]  [<ffffffff81160da0>] sys_open+0x20/0x30
[28559.210651]  [<ffffffff8100c102>] system_call_fastpath+0x16/0x1b
[28559.210651] Code: c0 80 ca 81 e8 ea e5 10 00 4c 89 e7 e8 c2 01 00 00 48 89 c2 b8 ed ff ff ff 48 85 d2 74 3e 49 8b 46 28 48 85 c0 0f 84 10 01 00 00 <4c> 8b 68 08 4d 85 ed 0f 84 03 01 00 00 8b 43 3c a8 02 74 3b 41 
[28559.210651] RIP  [<ffffffff811d23a8>] sysfs_open_file+0x98/0x220
[28559.210651]  RSP <ffff8800aa661c48>
[28559.491748] ---[ end trace b5ec29a370a26a78 ]---
[28561.741981] general protection fault: 0000 [#3] SMP 
[28561.749259] last sysfs file: /sys/devices/rbd/0/pool
[28561.750498] CPU 0 
[28561.750498] Modules linked in: cryptd aes_x86_64 aes_generic rbd libceph btrfs zlib_deflate libcrc32c ip6table_filter ip6_tables ipt_MASQUERADE iptable_nat nf_nat nf_conntrack_ipv4 nf_defrag_ipv4 xt_state nf_conntrack ipt_REJECT xt_tcpudp iptable_filter ip_tables x_tables kvm_intel kvm radeon ttm bridge drm_kms_helper i5000_edac drm stp edac_core ioatdma i5k_amb ppdev i2c_algo_bit ghes shpchp serio_raw dca parport_pc joydev hed lp parport usbhid hid e1000e ahci libahci
[28561.750498] 
[28561.750498] Pid: 8519, comm: cat Tainted: G      D W   2.6.37-12-server #26~lucid1-Ubuntu X7DVL/X7DVL
[28561.750498] RIP: 0010:[<ffffffff811d23a8>]  [<ffffffff811d23a8>] sysfs_open_file+0x98/0x220
[28561.750498] RSP: 0018:ffff8800aa661c48  EFLAGS: 00010206
[28561.750498] RAX: 3337333035352030 RBX: ffff8801a185b6c0 RCX: ffff8800aa1a90a4
[28561.750498] RDX: ffff8800aa1a90a0 RSI: 0000000000000001 RDI: ffff8800aa1a90a0
[28561.750498] RBP: ffff8800aa661c88 R08: 6462722f73656369 R09: 6462722f73656369
[28561.750498] R10: 006c6f6f702f302f R11: 7665642f7379732f R12: ffff8800aa1a90a0
[28561.750498] R13: ffffffff81ca90a8 R14: ffff8800aa238238 R15: ffff8800a19b13b0
[28561.750498] FS:  00007fd94dc5f700(0000) GS:ffff8800cfc00000(0000) knlGS:0000000000000000
[28561.750498] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[28561.750498] CR2: 00007fd94d8131c0 CR3: 00000000c52c8000 CR4: 00000000000006f0
[28561.750498] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
[28561.750498] DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000400
[28561.750498] Process cat (pid: 8519, threadinfo ffff8800aa660000, task ffff880100adad80)
[28561.750498] Stack:
[28561.750498]  ffff8800a19b13b0 ffff8800a19a56c0 0000000000000000 ffff8801a185b6c0
[28561.750498]  ffff8801a1e2d700 ffff8800a19a56c0 ffffffff811d2310 ffff8800a19b13b0
[28561.750498]  ffff8800aa661ce8 ffffffff81160eb7 ffff8800aa661cc8 ffffffff811d0e76
[28561.750498] Call Trace:
[28561.750498]  [<ffffffff811d2310>] ? sysfs_open_file+0x0/0x220
[28561.750498]  [<ffffffff81160eb7>] __dentry_open+0xe7/0x330
[28561.750498]  [<ffffffff811d0e76>] ? sysfs_permission+0x56/0x70
[28561.750498]  [<ffffffff81161221>] nameidata_to_filp+0x61/0x70
[28561.750498]  [<ffffffff8116e888>] finish_open+0xe8/0x1d0
[28561.750498]  [<ffffffff811769ef>] ? dput+0x8f/0x160
[28561.750498]  [<ffffffff8116f906>] do_last+0x86/0x420
[28561.750498]  [<ffffffff81171a13>] do_filp_open+0x203/0x5f0
[28561.750498]  [<ffffffff8112fc39>] ? handle_mm_fault+0x1b9/0x420
[28561.750498]  [<ffffffff81135605>] ? mmap_region+0x255/0x5a0
[28561.750498]  [<ffffffff812ad220>] ? apparmor_inode_getattr+0x60/0x70
[28561.750498]  [<ffffffff8117d1fa>] ? alloc_fd+0x10a/0x150
[28561.750498]  [<ffffffff81160c79>] do_sys_open+0x69/0x150
[28561.750498]  [<ffffffff81160da0>] sys_open+0x20/0x30
[28561.750498]  [<ffffffff8100c102>] system_call_fastpath+0x16/0x1b
[28561.750498] Code: c0 80 ca 81 e8 ea e5 10 00 4c 89 e7 e8 c2 01 00 00 48 89 c2 b8 ed ff ff ff 48 85 d2 74 3e 49 8b 46 28 48 85 c0 0f 84 10 01 00 00 <4c> 8b 68 08 4d 85 ed 0f 84 03 01 00 00 8b 43 3c a8 02 74 3b 41 
[28561.750498] RIP  [<ffffffff811d23a8>] sysfs_open_file+0x98/0x220
[28561.750498]  RSP <ffff8800aa661c48>
[28562.082785] ---[ end trace b5ec29a370a26a79 ]---
[28568.678430] general protection fault: 0000 [#4] SMP 
[28568.685576] last sysfs file: /sys/devices/rbd/0/name
[28568.687449] CPU 0 
[28568.687449] Modules linked in: cryptd aes_x86_64 aes_generic rbd libceph btrfs zlib_deflate libcrc32c ip6table_filter ip6_tables ipt_MASQUERADE iptable_nat nf_nat nf_conntrack_ipv4 nf_defrag_ipv4 xt_state nf_conntrack ipt_REJECT xt_tcpudp iptable_filter ip_tables x_tables kvm_intel kvm radeon ttm bridge drm_kms_helper i5000_edac drm stp edac_core ioatdma i5k_amb ppdev i2c_algo_bit ghes shpchp serio_raw dca parport_pc joydev hed lp parport usbhid hid e1000e ahci libahci
[28568.687449] 
[28568.687449] Pid: 8522, comm: cat Tainted: G      D W   2.6.37-12-server #26~lucid1-Ubuntu X7DVL/X7DVL
[28568.687449] RIP: 0010:[<ffffffff811d23a8>]  [<ffffffff811d23a8>] sysfs_open_file+0x98/0x220
[28568.687449] RSP: 0018:ffff8800b2083c48  EFLAGS: 00010206
[28568.687449] RAX: 3337333035352030 RBX: ffff88017c3d2840 RCX: ffff8800aa1a9054
[28568.687449] RDX: ffff8800aa1a9050 RSI: 0000000000000003 RDI: ffff8800aa1a9050
[28568.687449] RBP: ffff8800b2083c88 R08: 6462722f73656369 R09: 6462722f73656369
[28568.687449] R10: 00656d616e2f302f R11: 7665642f7379732f R12: ffff8800aa1a9050
[28568.687449] R13: ffffffff81ca90a8 R14: ffff8800aa238238 R15: ffff8800a1996460
[28568.687449] FS:  00007ffff7fed700(0000) GS:ffff8800cfc00000(0000) knlGS:0000000000000000
[28568.687449] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[28568.687449] CR2: 00007ffff7ba21c0 CR3: 00000000aa0c8000 CR4: 00000000000006f0
[28568.687449] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
[28568.687449] DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000400
[28568.838859] Process cat (pid: 8522, threadinfo ffff8800b2082000, task ffff8800aa25ad80)
[28568.838859] Stack:
[28568.838859]  ffff8800a1996460 ffff8800a19a5240 0000000000000000 ffff88017c3d2840
[28568.838859]  ffff8801a1e2d700 ffff8800a19a5240 ffffffff811d2310 ffff8800a1996460
[28568.838859]  ffff8800b2083ce8 ffffffff81160eb7 ffff8800b2083cc8 ffffffff811d0e76
[28568.838859] Call Trace:
[28568.838859]  [<ffffffff811d2310>] ? sysfs_open_file+0x0/0x220
[28568.838859]  [<ffffffff81160eb7>] __dentry_open+0xe7/0x330
[28568.838859]  [<ffffffff811d0e76>] ? sysfs_permission+0x56/0x70
[28568.838859]  [<ffffffff81161221>] nameidata_to_filp+0x61/0x70
[28568.838859]  [<ffffffff8116e888>] finish_open+0xe8/0x1d0
[28568.838859]  [<ffffffff811769ef>] ? dput+0x8f/0x160
[28568.838859]  [<ffffffff8116f906>] do_last+0x86/0x420
[28568.838859]  [<ffffffff81171a13>] do_filp_open+0x203/0x5f0
[28568.838859]  [<ffffffff8112fc39>] ? handle_mm_fault+0x1b9/0x420
[28568.838859]  [<ffffffff81135605>] ? mmap_region+0x255/0x5a0
[28568.838859]  [<ffffffff812ad220>] ? apparmor_inode_getattr+0x60/0x70
[28568.838859]  [<ffffffff8117d1fa>] ? alloc_fd+0x10a/0x150
[28568.838859]  [<ffffffff81160c79>] do_sys_open+0x69/0x150
[28568.838859]  [<ffffffff81160da0>] sys_open+0x20/0x30
[28568.838859]  [<ffffffff8100c102>] system_call_fastpath+0x16/0x1b
[28568.838859] Code: c0 80 ca 81 e8 ea e5 10 00 4c 89 e7 e8 c2 01 00 00 48 89 c2 b8 ed ff ff ff 48 85 d2 74 3e 49 8b 46 28 48 85 c0 0f 84 10 01 00 00 <4c> 8b 68 08 4d 85 ed 0f 84 03 01 00 00 8b 43 3c a8 02 74 3b 41 
[28568.838859] RIP  [<ffffffff811d23a8>] sysfs_open_file+0x98/0x220
[28568.838859]  RSP <ffff8800b2083c48>
[28569.017906] ---[ end trace b5ec29a370a26a7a ]---

This is on my 'noisy' machine, feel free to log in and check it out.

The kernel I'm running is from Ubuntu: 2.6.37-12-server