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[Bug 1368991] [NEW] scsi_transport_sas: move bsg destructor into sas_rphy_remove

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Public bug reported:

hello -

we had a freshly installed 14.04.1 server run into disk access issues
after swapping out a hard drive.  on further investigation, whenever a
drive is pulled (on both the mptsas and mpt2sas systems i can test) the
included warning is logged.

the message is reproducible simply by pulling a drive, but i have not
seen a recurrence of the issue where other drives become unresponsive.

the attached upstream patch (
https://git.kernel.org/cgit/linux/kernel/git/stable/linux-
stable.git/commit/?id=6aa6caff30f5dcb9e55b03b9710c30b83750cae5 ) has
been applied to both 3.12.23 and 3.14.7.  when i applied it locally to
the packaged linux-source the resulting kernel does not log these
warnings.

as it is a fairly trivial patch that has already been applied to other
kernel versions upstream, i'm hopeful that it could be included as an
SRU.

thank you for your time and effort!

andy

kern  :warn  : [Thu Sep 11 14:50:08 2014] ------------[ cut here ]------------
kern  :warn  : [Thu Sep 11 14:50:08 2014] WARNING: CPU: 0 PID: 27756 at /build/buildd/linux-3.13.0/fs/sysfs/group.c:214 sysfs_remove_group+0xc6/0xd0()
kern  :warn  : [Thu Sep 11 14:50:08 2014] sysfs group ffffffff81cabde0 not found for kobject 'end_device-6:1:23'
kern  :warn  : [Thu Sep 11 14:50:08 2014] Modules linked in: drbd lru_cache libcrc32c 8021q garp mrp autofs4 ib_iser rdma_cm iw_cm ib_cm ib_sa ib_mad ib_core ib_addr iscsi_tcp libiscsi_tcp libiscsi scsi_transport_iscsi nfsv3 sch_sfq nfsd auth_rpcgss nfs_acl nfs lockd sunrpc fscache bridge stp llc bonding gpio_ich joydev intel_powerclamp dm_multipath coretemp scsi_dh kvm_intel kvm i7core_edac lpc_ich vhost_net edac_core ioatdma serio_raw vhost macvtap macvlan mac_hid ipmi_si ipmi_devintf usbkbd ses enclosure raid10 raid456 async_raid6_recov async_memcpy async_pq async_xor async_tx xor hid_generic usbhid hid raid6_pq raid1 igb raid0 mptsas i2c_algo_bit mptscsih ahci multipath dca ptp mptbase libahci psmouse linear scsi_transport_sas pps_core
kern  :warn  : [Thu Sep 11 14:50:08 2014] CPU: 0 PID: 27756 Comm: kworker/u49:6 Not tainted 3.13.0-35-generic #62-Ubuntu
kern  :warn  : [Thu Sep 11 14:50:08 2014] Hardware name: Supermicro X8DT3/X8DT3, BIOS 2.0a    09/14/2010
kern  :warn  : [Thu Sep 11 14:50:08 2014] Workqueue: mpt/0 mptsas_firmware_event_work [mptsas]
kern  :warn  : [Thu Sep 11 14:50:08 2014]  0000000000000009 ffff880126a01ac8 ffffffff8171e320 ffff880126a01b10
kern  :warn  : [Thu Sep 11 14:50:08 2014]  ffff880126a01b00 ffffffff8106775d 0000000000000000 ffffffff81cabde0
kern  :warn  : [Thu Sep 11 14:50:08 2014]  ffff880bf9410c10 ffff880bf986e400 5003048000d2e6da ffff880126a01b60
kern  :warn  : [Thu Sep 11 14:50:08 2014] Call Trace:
kern  :warn  : [Thu Sep 11 14:50:08 2014]  [<ffffffff8171e320>] dump_stack+0x45/0x56
kern  :warn  : [Thu Sep 11 14:50:08 2014]  [<ffffffff8106775d>] warn_slowpath_common+0x7d/0xa0
kern  :warn  : [Thu Sep 11 14:50:08 2014]  [<ffffffff810677cc>] warn_slowpath_fmt+0x4c/0x50
kern  :warn  : [Thu Sep 11 14:50:08 2014]  [<ffffffff81234b3e>] ? sysfs_get_dirent_ns+0x4e/0x70
kern  :warn  : [Thu Sep 11 14:50:08 2014]  [<ffffffff81235e26>] sysfs_remove_group+0xc6/0xd0
kern  :warn  : [Thu Sep 11 14:50:08 2014]  [<ffffffff8149bb23>] dpm_sysfs_remove+0x43/0x50
kern  :warn  : [Thu Sep 11 14:50:08 2014]  [<ffffffff81491525>] device_del+0x45/0x1c0
kern  :warn  : [Thu Sep 11 14:50:08 2014]  [<ffffffff814916be>] device_unregister+0x1e/0x60
kern  :warn  : [Thu Sep 11 14:50:08 2014]  [<ffffffff813507de>] bsg_unregister_queue+0x5e/0xa0
kern  :warn  : [Thu Sep 11 14:50:08 2014]  [<ffffffffa001516c>] sas_rphy_free+0xac/0xe0 [scsi_transport_sas]
kern  :warn  : [Thu Sep 11 14:50:08 2014]  [<ffffffffa0017085>] sas_port_delete+0x35/0x170 [scsi_transport_sas]
kern  :warn  : [Thu Sep 11 14:50:08 2014]  [<ffffffff81235033>] ? sysfs_remove_link+0x23/0x30
kern  :warn  : [Thu Sep 11 14:50:08 2014]  [<ffffffffa009e745>] mptsas_del_end_device+0x185/0x270 [mptsas]
kern  :warn  : [Thu Sep 11 14:50:08 2014]  [<ffffffffa00a45d4>] mptsas_hotplug_work+0x1f4/0x9b0 [mptsas]
kern  :warn  : [Thu Sep 11 14:50:08 2014]  [<ffffffffa00a56c1>] mptsas_firmware_event_work+0x3e1/0xf4c [mptsas]
kern  :warn  : [Thu Sep 11 14:50:08 2014]  [<ffffffff8101b763>] ? native_sched_clock+0x13/0x80
kern  :warn  : [Thu Sep 11 14:50:08 2014]  [<ffffffff8101b7d9>] ? sched_clock+0x9/0x10
kern  :warn  : [Thu Sep 11 14:50:08 2014]  [<ffffffff8109d415>] ? sched_clock_cpu+0xb5/0x100
kern  :warn  : [Thu Sep 11 14:50:08 2014]  [<ffffffff810125c6>] ? __switch_to+0x126/0x4c0
kern  :warn  : [Thu Sep 11 14:50:08 2014]  [<ffffffff810839d2>] process_one_work+0x182/0x450
kern  :warn  : [Thu Sep 11 14:50:08 2014]  [<ffffffff810847c1>] worker_thread+0x121/0x410
kern  :warn  : [Thu Sep 11 14:50:08 2014]  [<ffffffff810846a0>] ? rescuer_thread+0x430/0x430
kern  :warn  : [Thu Sep 11 14:50:08 2014]  [<ffffffff8108b4a2>] kthread+0xd2/0xf0
kern  :warn  : [Thu Sep 11 14:50:08 2014]  [<ffffffff8108b3d0>] ? kthread_create_on_node+0x1c0/0x1c0
kern  :warn  : [Thu Sep 11 14:50:08 2014]  [<ffffffff8172ecbc>] ret_from_fork+0x7c/0xb0
kern  :warn  : [Thu Sep 11 14:50:08 2014]  [<ffffffff8108b3d0>] ? kthread_create_on_node+0x1c0/0x1c0
kern  :warn  : [Thu Sep 11 14:50:08 2014] ---[ end trace ad4ab1f037505d41 ]---

ProblemType: Bug
DistroRelease: Ubuntu 14.04
Package: linux-image-3.13.0-35-generic 3.13.0-35.62
ProcVersionSignature: Ubuntu 3.13.0-35.62-generic 3.13.11.6
Uname: Linux 3.13.0-35-generic x86_64
AlsaDevices:
 total 0
 crw-rw---- 1 root audio 116,  1 Sep 10 10:02 seq
 crw-rw---- 1 root audio 116, 33 Sep 10 10:02 timer
AplayDevices: Error: [Errno 2] No such file or directory: 'aplay'
ApportVersion: 2.14.1-0ubuntu3.3
Architecture: amd64
ArecordDevices: Error: [Errno 2] No such file or directory: 'arecord'
AudioDevicesInUse: Error: command ['fuser', '-v', '/dev/snd/seq', '/dev/snd/timer'] failed with exit code 1:
CRDA: Error: [Errno 2] No such file or directory: 'iw'
Date: Fri Sep 12 15:35:25 2014
IwConfig: Error: [Errno 2] No such file or directory: 'iwconfig'
MachineType: Supermicro X8DT6
PciMultimedia:

ProcEnviron:
 TERM=rxvt-unicode-256color
 PATH=(custom, no user)
 LANG=en_US.UTF-8
 SHELL=/usr/bin/zsh
ProcFB:

ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.13.0-35-generic root=/dev/md0 ro consoleblank=0 console=tty0 console=ttyS2,115200n8 nomdmonddf nomdmonisw bootdegraded=true
RelatedPackageVersions:
 linux-restricted-modules-3.13.0-35-generic N/A
 linux-backports-modules-3.13.0-35-generic  N/A
 linux-firmware                             1.127.5
RfKill: Error: [Errno 2] No such file or directory: 'rfkill'
SourcePackage: linux
UpgradeStatus: No upgrade log present (probably fresh install)
dmi.bios.date: 05/15/2012
dmi.bios.vendor: American Megatrends Inc.
dmi.bios.version: 2.0c
dmi.board.asset.tag: 1234567890
dmi.board.name: X8DT6
dmi.board.vendor: Supermicro
dmi.board.version: 1234567890
dmi.chassis.asset.tag: To Be Filled By O.E.M.
dmi.chassis.type: 17
dmi.chassis.vendor: Supermicro
dmi.chassis.version: 1234567890
dmi.modalias: dmi:bvnAmericanMegatrendsInc.:bvr2.0c:bd05/15/2012:svnSupermicro:pnX8DT6:pvr1234567890:rvnSupermicro:rnX8DT6:rvr1234567890:cvnSupermicro:ct17:cvr1234567890:
dmi.product.name: X8DT6
dmi.product.version: 1234567890
dmi.sys.vendor: Supermicro

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


** Tags: amd64 apport-bug trusty

** Patch added: "commit 6aa6caff30f5dcb9e55b03b9710c30b83750cae5 upstream."
   https://bugs.launchpad.net/bugs/1368991/+attachment/4202729/+files/6aa6caff30f5dcb9e55b03b9710c30b83750cae5.patch

** Description changed:

  hello -
  
  we had a freshly installed 14.04.1 server run into disk access issues
  after swapping out a hard drive.  on further investigation, whenever a
  drive is pulled (on both the mptsas and mpt2sas systems i can test) the
  included warning is logged.
  
  the message is reproducible simply by pulling a drive, but i have not
  seen a recurrence of the issue where other drives become unresponsive.
  
  the attached upstream patch (
  https://git.kernel.org/cgit/linux/kernel/git/stable/linux-
  stable.git/commit/?id=6aa6caff30f5dcb9e55b03b9710c30b83750cae5 ) has
  been applied to both 3.12.23 and 3.14.7.  when i applied it locally to
  the packaged linux-source the resulting kernel does not log these
  warnings.
  
- as it it a fairly trivial patch, i'm hopeful that it could be included
- as an SRU.
+ as it is a fairly trivial patch that has already been applied to other
+ kernel versions upstream, i'm hopeful that it could be included as an
+ SRU.
  
  thank you for your time and effort!
  
  andy
  
  kern  :warn  : [Thu Sep 11 14:50:08 2014] ------------[ cut here ]------------
  kern  :warn  : [Thu Sep 11 14:50:08 2014] WARNING: CPU: 0 PID: 27756 at /build/buildd/linux-3.13.0/fs/sysfs/group.c:214 sysfs_remove_group+0xc6/0xd0()
  kern  :warn  : [Thu Sep 11 14:50:08 2014] sysfs group ffffffff81cabde0 not found for kobject 'end_device-6:1:23'
  kern  :warn  : [Thu Sep 11 14:50:08 2014] Modules linked in: drbd lru_cache libcrc32c 8021q garp mrp autofs4 ib_iser rdma_cm iw_cm ib_cm ib_sa ib_mad ib_core ib_addr iscsi_tcp libiscsi_tcp libiscsi scsi_transport_iscsi nfsv3 sch_sfq nfsd auth_rpcgss nfs_acl nfs lockd sunrpc fscache bridge stp llc bonding gpio_ich joydev intel_powerclamp dm_multipath coretemp scsi_dh kvm_intel kvm i7core_edac lpc_ich vhost_net edac_core ioatdma serio_raw vhost macvtap macvlan mac_hid ipmi_si ipmi_devintf usbkbd ses enclosure raid10 raid456 async_raid6_recov async_memcpy async_pq async_xor async_tx xor hid_generic usbhid hid raid6_pq raid1 igb raid0 mptsas i2c_algo_bit mptscsih ahci multipath dca ptp mptbase libahci psmouse linear scsi_transport_sas pps_core
  kern  :warn  : [Thu Sep 11 14:50:08 2014] CPU: 0 PID: 27756 Comm: kworker/u49:6 Not tainted 3.13.0-35-generic #62-Ubuntu
  kern  :warn  : [Thu Sep 11 14:50:08 2014] Hardware name: Supermicro X8DT3/X8DT3, BIOS 2.0a    09/14/2010
  kern  :warn  : [Thu Sep 11 14:50:08 2014] Workqueue: mpt/0 mptsas_firmware_event_work [mptsas]
  kern  :warn  : [Thu Sep 11 14:50:08 2014]  0000000000000009 ffff880126a01ac8 ffffffff8171e320 ffff880126a01b10
  kern  :warn  : [Thu Sep 11 14:50:08 2014]  ffff880126a01b00 ffffffff8106775d 0000000000000000 ffffffff81cabde0
  kern  :warn  : [Thu Sep 11 14:50:08 2014]  ffff880bf9410c10 ffff880bf986e400 5003048000d2e6da ffff880126a01b60
  kern  :warn  : [Thu Sep 11 14:50:08 2014] Call Trace:
  kern  :warn  : [Thu Sep 11 14:50:08 2014]  [<ffffffff8171e320>] dump_stack+0x45/0x56
  kern  :warn  : [Thu Sep 11 14:50:08 2014]  [<ffffffff8106775d>] warn_slowpath_common+0x7d/0xa0
  kern  :warn  : [Thu Sep 11 14:50:08 2014]  [<ffffffff810677cc>] warn_slowpath_fmt+0x4c/0x50
  kern  :warn  : [Thu Sep 11 14:50:08 2014]  [<ffffffff81234b3e>] ? sysfs_get_dirent_ns+0x4e/0x70
  kern  :warn  : [Thu Sep 11 14:50:08 2014]  [<ffffffff81235e26>] sysfs_remove_group+0xc6/0xd0
  kern  :warn  : [Thu Sep 11 14:50:08 2014]  [<ffffffff8149bb23>] dpm_sysfs_remove+0x43/0x50
  kern  :warn  : [Thu Sep 11 14:50:08 2014]  [<ffffffff81491525>] device_del+0x45/0x1c0
  kern  :warn  : [Thu Sep 11 14:50:08 2014]  [<ffffffff814916be>] device_unregister+0x1e/0x60
  kern  :warn  : [Thu Sep 11 14:50:08 2014]  [<ffffffff813507de>] bsg_unregister_queue+0x5e/0xa0
  kern  :warn  : [Thu Sep 11 14:50:08 2014]  [<ffffffffa001516c>] sas_rphy_free+0xac/0xe0 [scsi_transport_sas]
  kern  :warn  : [Thu Sep 11 14:50:08 2014]  [<ffffffffa0017085>] sas_port_delete+0x35/0x170 [scsi_transport_sas]
  kern  :warn  : [Thu Sep 11 14:50:08 2014]  [<ffffffff81235033>] ? sysfs_remove_link+0x23/0x30
  kern  :warn  : [Thu Sep 11 14:50:08 2014]  [<ffffffffa009e745>] mptsas_del_end_device+0x185/0x270 [mptsas]
  kern  :warn  : [Thu Sep 11 14:50:08 2014]  [<ffffffffa00a45d4>] mptsas_hotplug_work+0x1f4/0x9b0 [mptsas]
  kern  :warn  : [Thu Sep 11 14:50:08 2014]  [<ffffffffa00a56c1>] mptsas_firmware_event_work+0x3e1/0xf4c [mptsas]
  kern  :warn  : [Thu Sep 11 14:50:08 2014]  [<ffffffff8101b763>] ? native_sched_clock+0x13/0x80
  kern  :warn  : [Thu Sep 11 14:50:08 2014]  [<ffffffff8101b7d9>] ? sched_clock+0x9/0x10
  kern  :warn  : [Thu Sep 11 14:50:08 2014]  [<ffffffff8109d415>] ? sched_clock_cpu+0xb5/0x100
  kern  :warn  : [Thu Sep 11 14:50:08 2014]  [<ffffffff810125c6>] ? __switch_to+0x126/0x4c0
  kern  :warn  : [Thu Sep 11 14:50:08 2014]  [<ffffffff810839d2>] process_one_work+0x182/0x450
  kern  :warn  : [Thu Sep 11 14:50:08 2014]  [<ffffffff810847c1>] worker_thread+0x121/0x410
  kern  :warn  : [Thu Sep 11 14:50:08 2014]  [<ffffffff810846a0>] ? rescuer_thread+0x430/0x430
  kern  :warn  : [Thu Sep 11 14:50:08 2014]  [<ffffffff8108b4a2>] kthread+0xd2/0xf0
  kern  :warn  : [Thu Sep 11 14:50:08 2014]  [<ffffffff8108b3d0>] ? kthread_create_on_node+0x1c0/0x1c0
  kern  :warn  : [Thu Sep 11 14:50:08 2014]  [<ffffffff8172ecbc>] ret_from_fork+0x7c/0xb0
  kern  :warn  : [Thu Sep 11 14:50:08 2014]  [<ffffffff8108b3d0>] ? kthread_create_on_node+0x1c0/0x1c0
  kern  :warn  : [Thu Sep 11 14:50:08 2014] ---[ end trace ad4ab1f037505d41 ]---
  
  ProblemType: Bug
  DistroRelease: Ubuntu 14.04
  Package: linux-image-3.13.0-35-generic 3.13.0-35.62
  ProcVersionSignature: Ubuntu 3.13.0-35.62-generic 3.13.11.6
  Uname: Linux 3.13.0-35-generic x86_64
  AlsaDevices:
-  total 0
-  crw-rw---- 1 root audio 116,  1 Sep 10 10:02 seq
-  crw-rw---- 1 root audio 116, 33 Sep 10 10:02 timer
+  total 0
+  crw-rw---- 1 root audio 116,  1 Sep 10 10:02 seq
+  crw-rw---- 1 root audio 116, 33 Sep 10 10:02 timer
  AplayDevices: Error: [Errno 2] No such file or directory: 'aplay'
  ApportVersion: 2.14.1-0ubuntu3.3
  Architecture: amd64
  ArecordDevices: Error: [Errno 2] No such file or directory: 'arecord'
  AudioDevicesInUse: Error: command ['fuser', '-v', '/dev/snd/seq', '/dev/snd/timer'] failed with exit code 1:
  CRDA: Error: [Errno 2] No such file or directory: 'iw'
  Date: Fri Sep 12 15:35:25 2014
  IwConfig: Error: [Errno 2] No such file or directory: 'iwconfig'
  MachineType: Supermicro X8DT6
  PciMultimedia:
-  
+ 
  ProcEnviron:
-  TERM=rxvt-unicode-256color
-  PATH=(custom, no user)
-  LANG=en_US.UTF-8
-  SHELL=/usr/bin/zsh
+  TERM=rxvt-unicode-256color
+  PATH=(custom, no user)
+  LANG=en_US.UTF-8
+  SHELL=/usr/bin/zsh
  ProcFB:
-  
+ 
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.13.0-35-generic root=/dev/md0 ro consoleblank=0 console=tty0 console=ttyS2,115200n8 nomdmonddf nomdmonisw bootdegraded=true
  RelatedPackageVersions:
-  linux-restricted-modules-3.13.0-35-generic N/A
-  linux-backports-modules-3.13.0-35-generic  N/A
-  linux-firmware                             1.127.5
+  linux-restricted-modules-3.13.0-35-generic N/A
+  linux-backports-modules-3.13.0-35-generic  N/A
+  linux-firmware                             1.127.5
  RfKill: Error: [Errno 2] No such file or directory: 'rfkill'
  SourcePackage: linux
  UpgradeStatus: No upgrade log present (probably fresh install)
  dmi.bios.date: 05/15/2012
  dmi.bios.vendor: American Megatrends Inc.
  dmi.bios.version: 2.0c
  dmi.board.asset.tag: 1234567890
  dmi.board.name: X8DT6
  dmi.board.vendor: Supermicro
  dmi.board.version: 1234567890
  dmi.chassis.asset.tag: To Be Filled By O.E.M.
  dmi.chassis.type: 17
  dmi.chassis.vendor: Supermicro
  dmi.chassis.version: 1234567890
  dmi.modalias: dmi:bvnAmericanMegatrendsInc.:bvr2.0c:bd05/15/2012:svnSupermicro:pnX8DT6:pvr1234567890:rvnSupermicro:rnX8DT6:rvr1234567890:cvnSupermicro:ct17:cvr1234567890:
  dmi.product.name: X8DT6
  dmi.product.version: 1234567890
  dmi.sys.vendor: Supermicro

-- 
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https://bugs.launchpad.net/bugs/1368991

Title:
  scsi_transport_sas: move bsg destructor into sas_rphy_remove

Status in “linux” package in Ubuntu:
  New

Bug description:
  hello -

  we had a freshly installed 14.04.1 server run into disk access issues
  after swapping out a hard drive.  on further investigation, whenever a
  drive is pulled (on both the mptsas and mpt2sas systems i can test)
  the included warning is logged.

  the message is reproducible simply by pulling a drive, but i have not
  seen a recurrence of the issue where other drives become unresponsive.

  the attached upstream patch (
  https://git.kernel.org/cgit/linux/kernel/git/stable/linux-
  stable.git/commit/?id=6aa6caff30f5dcb9e55b03b9710c30b83750cae5 ) has
  been applied to both 3.12.23 and 3.14.7.  when i applied it locally to
  the packaged linux-source the resulting kernel does not log these
  warnings.

  as it is a fairly trivial patch that has already been applied to other
  kernel versions upstream, i'm hopeful that it could be included as an
  SRU.

  thank you for your time and effort!

  andy

  kern  :warn  : [Thu Sep 11 14:50:08 2014] ------------[ cut here ]------------
  kern  :warn  : [Thu Sep 11 14:50:08 2014] WARNING: CPU: 0 PID: 27756 at /build/buildd/linux-3.13.0/fs/sysfs/group.c:214 sysfs_remove_group+0xc6/0xd0()
  kern  :warn  : [Thu Sep 11 14:50:08 2014] sysfs group ffffffff81cabde0 not found for kobject 'end_device-6:1:23'
  kern  :warn  : [Thu Sep 11 14:50:08 2014] Modules linked in: drbd lru_cache libcrc32c 8021q garp mrp autofs4 ib_iser rdma_cm iw_cm ib_cm ib_sa ib_mad ib_core ib_addr iscsi_tcp libiscsi_tcp libiscsi scsi_transport_iscsi nfsv3 sch_sfq nfsd auth_rpcgss nfs_acl nfs lockd sunrpc fscache bridge stp llc bonding gpio_ich joydev intel_powerclamp dm_multipath coretemp scsi_dh kvm_intel kvm i7core_edac lpc_ich vhost_net edac_core ioatdma serio_raw vhost macvtap macvlan mac_hid ipmi_si ipmi_devintf usbkbd ses enclosure raid10 raid456 async_raid6_recov async_memcpy async_pq async_xor async_tx xor hid_generic usbhid hid raid6_pq raid1 igb raid0 mptsas i2c_algo_bit mptscsih ahci multipath dca ptp mptbase libahci psmouse linear scsi_transport_sas pps_core
  kern  :warn  : [Thu Sep 11 14:50:08 2014] CPU: 0 PID: 27756 Comm: kworker/u49:6 Not tainted 3.13.0-35-generic #62-Ubuntu
  kern  :warn  : [Thu Sep 11 14:50:08 2014] Hardware name: Supermicro X8DT3/X8DT3, BIOS 2.0a    09/14/2010
  kern  :warn  : [Thu Sep 11 14:50:08 2014] Workqueue: mpt/0 mptsas_firmware_event_work [mptsas]
  kern  :warn  : [Thu Sep 11 14:50:08 2014]  0000000000000009 ffff880126a01ac8 ffffffff8171e320 ffff880126a01b10
  kern  :warn  : [Thu Sep 11 14:50:08 2014]  ffff880126a01b00 ffffffff8106775d 0000000000000000 ffffffff81cabde0
  kern  :warn  : [Thu Sep 11 14:50:08 2014]  ffff880bf9410c10 ffff880bf986e400 5003048000d2e6da ffff880126a01b60
  kern  :warn  : [Thu Sep 11 14:50:08 2014] Call Trace:
  kern  :warn  : [Thu Sep 11 14:50:08 2014]  [<ffffffff8171e320>] dump_stack+0x45/0x56
  kern  :warn  : [Thu Sep 11 14:50:08 2014]  [<ffffffff8106775d>] warn_slowpath_common+0x7d/0xa0
  kern  :warn  : [Thu Sep 11 14:50:08 2014]  [<ffffffff810677cc>] warn_slowpath_fmt+0x4c/0x50
  kern  :warn  : [Thu Sep 11 14:50:08 2014]  [<ffffffff81234b3e>] ? sysfs_get_dirent_ns+0x4e/0x70
  kern  :warn  : [Thu Sep 11 14:50:08 2014]  [<ffffffff81235e26>] sysfs_remove_group+0xc6/0xd0
  kern  :warn  : [Thu Sep 11 14:50:08 2014]  [<ffffffff8149bb23>] dpm_sysfs_remove+0x43/0x50
  kern  :warn  : [Thu Sep 11 14:50:08 2014]  [<ffffffff81491525>] device_del+0x45/0x1c0
  kern  :warn  : [Thu Sep 11 14:50:08 2014]  [<ffffffff814916be>] device_unregister+0x1e/0x60
  kern  :warn  : [Thu Sep 11 14:50:08 2014]  [<ffffffff813507de>] bsg_unregister_queue+0x5e/0xa0
  kern  :warn  : [Thu Sep 11 14:50:08 2014]  [<ffffffffa001516c>] sas_rphy_free+0xac/0xe0 [scsi_transport_sas]
  kern  :warn  : [Thu Sep 11 14:50:08 2014]  [<ffffffffa0017085>] sas_port_delete+0x35/0x170 [scsi_transport_sas]
  kern  :warn  : [Thu Sep 11 14:50:08 2014]  [<ffffffff81235033>] ? sysfs_remove_link+0x23/0x30
  kern  :warn  : [Thu Sep 11 14:50:08 2014]  [<ffffffffa009e745>] mptsas_del_end_device+0x185/0x270 [mptsas]
  kern  :warn  : [Thu Sep 11 14:50:08 2014]  [<ffffffffa00a45d4>] mptsas_hotplug_work+0x1f4/0x9b0 [mptsas]
  kern  :warn  : [Thu Sep 11 14:50:08 2014]  [<ffffffffa00a56c1>] mptsas_firmware_event_work+0x3e1/0xf4c [mptsas]
  kern  :warn  : [Thu Sep 11 14:50:08 2014]  [<ffffffff8101b763>] ? native_sched_clock+0x13/0x80
  kern  :warn  : [Thu Sep 11 14:50:08 2014]  [<ffffffff8101b7d9>] ? sched_clock+0x9/0x10
  kern  :warn  : [Thu Sep 11 14:50:08 2014]  [<ffffffff8109d415>] ? sched_clock_cpu+0xb5/0x100
  kern  :warn  : [Thu Sep 11 14:50:08 2014]  [<ffffffff810125c6>] ? __switch_to+0x126/0x4c0
  kern  :warn  : [Thu Sep 11 14:50:08 2014]  [<ffffffff810839d2>] process_one_work+0x182/0x450
  kern  :warn  : [Thu Sep 11 14:50:08 2014]  [<ffffffff810847c1>] worker_thread+0x121/0x410
  kern  :warn  : [Thu Sep 11 14:50:08 2014]  [<ffffffff810846a0>] ? rescuer_thread+0x430/0x430
  kern  :warn  : [Thu Sep 11 14:50:08 2014]  [<ffffffff8108b4a2>] kthread+0xd2/0xf0
  kern  :warn  : [Thu Sep 11 14:50:08 2014]  [<ffffffff8108b3d0>] ? kthread_create_on_node+0x1c0/0x1c0
  kern  :warn  : [Thu Sep 11 14:50:08 2014]  [<ffffffff8172ecbc>] ret_from_fork+0x7c/0xb0
  kern  :warn  : [Thu Sep 11 14:50:08 2014]  [<ffffffff8108b3d0>] ? kthread_create_on_node+0x1c0/0x1c0
  kern  :warn  : [Thu Sep 11 14:50:08 2014] ---[ end trace ad4ab1f037505d41 ]---

  ProblemType: Bug
  DistroRelease: Ubuntu 14.04
  Package: linux-image-3.13.0-35-generic 3.13.0-35.62
  ProcVersionSignature: Ubuntu 3.13.0-35.62-generic 3.13.11.6
  Uname: Linux 3.13.0-35-generic x86_64
  AlsaDevices:
   total 0
   crw-rw---- 1 root audio 116,  1 Sep 10 10:02 seq
   crw-rw---- 1 root audio 116, 33 Sep 10 10:02 timer
  AplayDevices: Error: [Errno 2] No such file or directory: 'aplay'
  ApportVersion: 2.14.1-0ubuntu3.3
  Architecture: amd64
  ArecordDevices: Error: [Errno 2] No such file or directory: 'arecord'
  AudioDevicesInUse: Error: command ['fuser', '-v', '/dev/snd/seq', '/dev/snd/timer'] failed with exit code 1:
  CRDA: Error: [Errno 2] No such file or directory: 'iw'
  Date: Fri Sep 12 15:35:25 2014
  IwConfig: Error: [Errno 2] No such file or directory: 'iwconfig'
  MachineType: Supermicro X8DT6
  PciMultimedia:

  ProcEnviron:
   TERM=rxvt-unicode-256color
   PATH=(custom, no user)
   LANG=en_US.UTF-8
   SHELL=/usr/bin/zsh
  ProcFB:

  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.13.0-35-generic root=/dev/md0 ro consoleblank=0 console=tty0 console=ttyS2,115200n8 nomdmonddf nomdmonisw bootdegraded=true
  RelatedPackageVersions:
   linux-restricted-modules-3.13.0-35-generic N/A
   linux-backports-modules-3.13.0-35-generic  N/A
   linux-firmware                             1.127.5
  RfKill: Error: [Errno 2] No such file or directory: 'rfkill'
  SourcePackage: linux
  UpgradeStatus: No upgrade log present (probably fresh install)
  dmi.bios.date: 05/15/2012
  dmi.bios.vendor: American Megatrends Inc.
  dmi.bios.version: 2.0c
  dmi.board.asset.tag: 1234567890
  dmi.board.name: X8DT6
  dmi.board.vendor: Supermicro
  dmi.board.version: 1234567890
  dmi.chassis.asset.tag: To Be Filled By O.E.M.
  dmi.chassis.type: 17
  dmi.chassis.vendor: Supermicro
  dmi.chassis.version: 1234567890
  dmi.modalias: dmi:bvnAmericanMegatrendsInc.:bvr2.0c:bd05/15/2012:svnSupermicro:pnX8DT6:pvr1234567890:rvnSupermicro:rnX8DT6:rvr1234567890:cvnSupermicro:ct17:cvr1234567890:
  dmi.product.name: X8DT6
  dmi.product.version: 1234567890
  dmi.sys.vendor: Supermicro

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