[Dell Studio 1569] BUG: soft lockup - CPU#0 stuck for 23s! [kworker/0:3:566]; RIP: 0010:[<ffffffffa00c9d73>] [<ffffffffa00c9d73>] mei_timer+0xc3/0x260 [mei]

Would it be possible for you to test the latest upstream kernel? Refer to https://wiki.ubuntu.com/KernelMainlineBuilds . Please test the latest v3.5kernel[0] (Not a kernel in the daily directory) and install both the linux-image and linux-image-extra .deb packages.

Once you've tested the upstream kernel, please remove the 'needs-upstream-testing' tag(Only that one tag, please leave the other tags). This can be done by clicking on the yellow pencil icon next to the tag located at the bottom of the bug description and deleting the 'needs-upstream-testing' text.

If this bug is fixed in the mainline kernel, please add the following tag 'kernel-fixed-upstream'.

If the mainline kernel does not fix this bug, please add the tag: 'kernel-bug-exists-upstream'.

If you are unable to test the mainline kernel, for example it will not boot, please add the tag: 'kernel-unable-to-test-upstream'.
Once testing of the upstream kernel is complete, please mark this bug as "Confirmed".

Thanks in advance.

[0] http://kernel.ubuntu.com/~kernel-ppa/mainline/v3.5-rc2-quantal/

Ok. Upstream Kernel Installed, Replicating scenario under which it usually locks up.

Usually it does so after it's been running about 4 hours, so we'll see. Please do reply with the command necessary to post additional debugging information to this bug thread just in case it does happen. I'll check back in here in about 6 hours and keep an eye on the machine to see if the bug remanifests.

It's been 10 hours now, and no lock up has occured yet. Marked Confirmed and tagged kernel-fixed-upstream

Just curious, is there any way to tell update manager to ignore or skip certain updates? I don't want to install a 3.2 kernel and have it broken again.

Pachy:
>"Just curious, is there any way to tell update manager to ignore or skip certain updates?"

Please see https://help.ubuntu.com/community/PinningHowto .

Instead of trying the 3.5-rc2 kernel listed above, the first time, I tried the current mainline 3.6.0. Unfortunately this bug is back in 3.6.0.

Using 3.5-rc2 does fix this bug.

You should probably reopen this bug and let the devs know what's going on.
On Aug 8, 2012 10:51 AM, "znorris" <email address hidden> wrote:

> Instead of trying the 3.5-rc2 kernel listed above, the first time, I
> tried the current mainline 3.6.0. Unfortunately this bug is back in
> 3.6.0.
>
> Using 3.5-rc2 does fix this bug.
>
> --
> You received this bug notification because you are subscribed to the bug
> report.
> https://bugs.launchpad.net/bugs/1011914
>
> Title:
> BUG: soft lockup - CPU#0 stuck for 23s! [kworker/0:3:566]; RIP:
> 0010:[<ffffffffa00c9d73>] [<ffffffffa00c9d73>] mei_timer+0xc3/0x260
> [mei]
>
> Status in “linux” package in Ubuntu:
> Confirmed
>
> Bug description:
> Bug causes system to lock up. Found this in my syslog:
>
> Jun 11 16:41:19 amu-Studio-1569 kernel: [11126.142243] BUG: soft lockup
> - CPU#0 stuck for 23s! [kworker/0:3:566]
> Jun 11 16:41:19 amu-Studio-1569 kernel: [11126.142250] Modules linked
> in: snd_seq_dummy joydev snd_hda_codec_hdmi snd_hda_codec_realtek
> parport_pc ppdev rfcomm bnep btusb bluetooth binfmt_misc arc4 dell_wmi
> sparse_keymap dell_laptop dcdbas snd_hda_intel snd_hda_codec snd_hwdep
> snd_pcm snd_seq_midi snd_rawmidi snd_seq_midi_event snd_seq snd_timer
> snd_seq_device iwlwifi i915 mac80211 drm_kms_helper wmi uvcvideo psmouse
> videodev v4l2_compat_ioctl32 cfg80211 mac_hid intel_ips snd serio_raw drm
> mei(C) soundcore i2c_algo_bit video snd_page_alloc lp parport usbhid hid
> r8169
> Jun 11 16:41:19 amu-Studio-1569 kernel: [11126.142316] CPU 0
> Jun 11 16:41:19 amu-Studio-1569 kernel: [11126.142318] Modules linked
> in: snd_seq_dummy joydev snd_hda_codec_hdmi snd_hda_codec_realtek
> parport_pc ppdev rfcomm bnep btusb bluetooth binfmt_misc arc4 dell_wmi
> sparse_keymap dell_laptop dcdbas snd_hda_intel snd_hda_codec snd_hwdep
> snd_pcm snd_seq_midi snd_rawmidi snd_seq_midi_event snd_seq snd_timer
> snd_seq_device iwlwifi i915 mac80211 drm_kms_helper wmi uvcvideo psmouse
> videodev v4l2_compat_ioctl32 cfg80211 mac_hid intel_ips snd serio_raw drm
> mei(C) soundcore i2c_algo_bit video snd_page_alloc lp parport usbhid hid
> r8169
> Jun 11 16:41:19 amu-Studio-1569 kernel: [11126.142369]
> Jun 11 16:41:19 amu-Studio-1569 kernel: [11126.142373] Pid: 566, comm:
> kworker/0:3 Tainted: G C 3.2.0-24-generic #39-Ubuntu Dell Inc.
> Studio 1569/0R225F
> Jun 11 16:41:19 amu-Studio-1569 kernel: [11126.142381] RIP:
> 0010:[<ffffffffa00c9d73>] [<ffffffffa00c9d73>] mei_timer+0xc3/0x260 [mei]
> Jun 11 16:41:19 amu-Studio-1569 kernel: [11126.142394] RSP:
> 0018:ffff880115149de0 EFLAGS: 00000283
> Jun 11 16:41:19 amu-Studio-1569 kernel: [11126.142398] RAX:
> ffff88012cef17f0 RBX: ffff880133409f00 RCX: ffff88012cef17f0
> Jun 11 16:41:19 amu-Studio-1569 kernel: [11126.142401] RDX:
> 0000000000000000 RSI: ffff88012cef1270 RDI: ffff88012cef1298
> Jun 11 16:41:19 amu-Studio-1569 kernel: [11126.142405] RBP:
> ffff880115149e00 R08: 0000000000000004 R09: 0000000000000004
> Jun 11 16:41:19 amu-Studio-1569 kernel: [11126.142408] R10:
> 0000000000000004 R11: 0000000000000064 R12: 0000000000000000
> Jun 11 16:41:19 amu-Studio-1569 kernel: [11126.142412] R13:
> ffffffff815...

@Pachy

Are you also seeing this issue again in the latest Quantal kernel?

@znorris,

Can you test can confirm the issue happens in v3.5-rc2[0] but not v3.5-rc1[1]?

[0] http://kernel.ubuntu.com/~kernel-ppa/mainline/v3.5-rc2-quantal/
[1] http://kernel.ubuntu.com/~kernel-ppa/mainline/v3.5-rc1-quantal/

@zmorris,

I read your comment wrong. Can you actually test the latest v3.5 kernel and comment back if it has the bug or not:

http://kernel.ubuntu.com/~kernel-ppa/mainline/v3.5.1-quantal/

@Joseph - No, I've got it pinned on the current kernel, still running
precise. So I haven't tested latest.

On Fri, Aug 10, 2012 at 2:53 PM, Joseph Salisbury <
<email address hidden>> wrote:

> @zmorris,
>
> I read your comment wrong. Can you actually test the latest v3.5 kernel
> and comment back if it has the bug or not:
>
> http://kernel.ubuntu.com/~kernel-ppa/mainline/v3.5.1-quantal/
>
> --
> You received this bug notification because you are subscribed to the bug
> report.
> https://bugs.launchpad.net/bugs/1011914
>
> Title:
> BUG: soft lockup - CPU#0 stuck for 23s! [kworker/0:3:566]; RIP:
> 0010:[<ffffffffa00c9d73>] [<ffffffffa00c9d73>] mei_timer+0xc3/0x260
> [mei]
>
> Status in “linux” package in Ubuntu:
> Confirmed
>
> Bug description:
> Bug causes system to lock up. Found this in my syslog:
>
> Jun 11 16:41:19 amu-Studio-1569 kernel: [11126.142243] BUG: soft lockup
> - CPU#0 stuck for 23s! [kworker/0:3:566]
> Jun 11 16:41:19 amu-Studio-1569 kernel: [11126.142250] Modules linked
> in: snd_seq_dummy joydev snd_hda_codec_hdmi snd_hda_codec_realtek
> parport_pc ppdev rfcomm bnep btusb bluetooth binfmt_misc arc4 dell_wmi
> sparse_keymap dell_laptop dcdbas snd_hda_intel snd_hda_codec snd_hwdep
> snd_pcm snd_seq_midi snd_rawmidi snd_seq_midi_event snd_seq snd_timer
> snd_seq_device iwlwifi i915 mac80211 drm_kms_helper wmi uvcvideo psmouse
> videodev v4l2_compat_ioctl32 cfg80211 mac_hid intel_ips snd serio_raw drm
> mei(C) soundcore i2c_algo_bit video snd_page_alloc lp parport usbhid hid
> r8169
> Jun 11 16:41:19 amu-Studio-1569 kernel: [11126.142316] CPU 0
> Jun 11 16:41:19 amu-Studio-1569 kernel: [11126.142318] Modules linked
> in: snd_seq_dummy joydev snd_hda_codec_hdmi snd_hda_codec_realtek
> parport_pc ppdev rfcomm bnep btusb bluetooth binfmt_misc arc4 dell_wmi
> sparse_keymap dell_laptop dcdbas snd_hda_intel snd_hda_codec snd_hwdep
> snd_pcm snd_seq_midi snd_rawmidi snd_seq_midi_event snd_seq snd_timer
> snd_seq_device iwlwifi i915 mac80211 drm_kms_helper wmi uvcvideo psmouse
> videodev v4l2_compat_ioctl32 cfg80211 mac_hid intel_ips snd serio_raw drm
> mei(C) soundcore i2c_algo_bit video snd_page_alloc lp parport usbhid hid
> r8169
> Jun 11 16:41:19 amu-Studio-1569 kernel: [11126.142369]
> Jun 11 16:41:19 amu-Studio-1569 kernel: [11126.142373] Pid: 566, comm:
> kworker/0:3 Tainted: G C 3.2.0-24-generic #39-Ubuntu Dell Inc.
> Studio 1569/0R225F
> Jun 11 16:41:19 amu-Studio-1569 kernel: [11126.142381] RIP:
> 0010:[<ffffffffa00c9d73>] [<ffffffffa00c9d73>] mei_timer+0xc3/0x260 [mei]
> Jun 11 16:41:19 amu-Studio-1569 kernel: [11126.142394] RSP:
> 0018:ffff880115149de0 EFLAGS: 00000283
> Jun 11 16:41:19 amu-Studio-1569 kernel: [11126.142398] RAX:
> ffff88012cef17f0 RBX: ffff880133409f00 RCX: ffff88012cef17f0
> Jun 11 16:41:19 amu-Studio-1569 kernel: [11126.142401] RDX:
> 0000000000000000 RSI: ffff88012cef1270 RDI: ffff88012cef1298
> Jun 11 16:41:19 amu-Studio-1569 kernel: [11126.142405] RBP:
> ffff880115149e00 R08: 0000000000000004 R09: 0000000000000004
> Jun 11 16:41:19 amu-Studio-1569 kernel: [11126.142408] R10:
> 0000000000000004 R11: 0000000000000064 R12: 0000000000000000
> Jun 11...

My current kernel is the quantal 3.5 rc2, that was suggested to me in this same bug.

Summary of kernels tested by me:
3.2.0-23 - Bug
3.2.0-27 - Bug
3.2.0-29 - Fixed
3.5.0-030500rc2 - Fixed
3.5.1-030501 -Fixed
3.6.0-999 - Bug

I'm receiving this error again in 3.2.0-29. Just installed 12.04.1 alternate amd64.

Got something similar:

Nov 15 00:24:38 lister kernel: [578296.072009] BUG: soft lockup - CPU#0 stuck for 23s! [umount:30662]
Nov 15 00:24:38 lister kernel: [578296.072015] Modules linked in: btusb vboxpci(O) vboxnetadp(O) vboxnetflt(O) vboxdrv(O) isofs nls_iso8859_1 nls_cp437 vfat fat nls_utf8 udf crc_itu_t pci_stub bnep rfcomm bluetooth parport_pc ppdev nfsd nfs lockd binfmt_misc fscache auth_rpcgss nfs_acl sunrpc vesafb snd_hda_codec_hdmi snd_hda_codec_realtek snd_usb_audio snd_usbmidi_lib snd_seq_midi psmouse snd_rawmidi snd_hda_intel snd_hda_codec snd_hwdep snd_seq_midi_event snd_pcm snd_seq lp ses uvcvideo videodev edac_core snd_timer pl2303 sp5100_tco enclosure v4l2_compat_ioctl32 hid_logitech_dj snd_seq_device usbserial snd soundcore i2c_piix4 edac_mce_amd asus_atk0110 joydev fglrx(P) mac_hid snd_page_alloc k10temp wmi serio_raw parport usb_storage usbhid hid pata_atiixp sky2 [last unloaded: vboxdrv]
Nov 15 00:24:38 lister kernel: [578296.072099] CPU 0
Nov 15 00:24:38 lister kernel: [578296.072101] Modules linked in: btusb vboxpci(O) vboxnetadp(O) vboxnetflt(O) vboxdrv(O) isofs nls_iso8859_1 nls_cp437 vfat fat nls_utf8 udf crc_itu_t pci_stub bnep rfcomm bluetooth parport_pc ppdev nfsd nfs lockd binfmt_misc fscache auth_rpcgNov 15 07:20:22 lister kernel: imklog 5.8.6, log source = /proc/kmsg started.

Linux lister 3.2.0-32-generic #51-Ubuntu SMP Wed Sep 26 21:33:09 UTC 2012 x86_64 x86_64 x86_64 GNU/Linux

From kern.log:

Nov 15 00:00:15 lister kernel: [576836.444343] EXT4-fs (sdc1): warning: checktime reached, running e2fsck is recommended
Nov 15 00:00:15 lister kernel: [576836.448622] EXT4-fs (sdc1): mounted filesystem with ordered data mode. Opts: (null)
Nov 15 00:24:38 lister kernel: [578296.072009] BUG: soft lockup - CPU#0 stuck for 23s! [umount:30662]
Nov 15 00:24:38 lister kernel: [578296.072015] Modules linked in: btusb vboxpci(O) vboxnetadp(O) vboxnetflt(O) vboxdrv(O) isofs nls_iso8859_1 nls_cp437 vfat fat nls_utf8 udf crc_itu_t pci_stub bnep rfcomm bluetooth parport_pc ppdev nfsd nfs lockd binfmt_misc fscache auth_rpcgss nfs_acl sunrpc vesafb snd_hda_codec_hdmi snd_hda_codec_realtek snd_usb_audio snd_usbmidi_lib snd_seq_midi psmouse snd_rawmidi snd_hda_intel snd_hda_codec snd_hwdep snd_seq_midi_event snd_pcm snd_seq lp ses uvcvideo videodev edac_core snd_timer pl2303 sp5100_tco enclosure v4l2_compat_ioctl32 hid_logitech_dj snd_seq_device usbserial snd soundcore i2c_piix4 edac_mce_amd asus_atk0110 joydev fglrx(P) mac_hid snd_page_alloc k10temp wmi serio_raw parport usb_storage usbhid hid pata_atiixp sky2 [last unloaded: vboxdrv]
Nov 15 00:24:38 lister kernel: [578296.072099] CPU 0
Nov 15 00:24:38 lister kernel: [578296.072101] Modules linked in: btusb vboxpci(O) vboxnetadp(O) vboxnetflt(O) vboxdrv(O) isofs nls_iso8859_1 nls_cp437 vfat fat nls_utf8 udf crc_itu_t pci_stub bnep rfcomm bluetooth parport_pc ppdev nfsd nfs lockd binfmt_misc fscache auth_rpcgss nfs_acl sunrpc vesafb snd_hda_codec_hdmi snd_hda_codec_realtek snd_usb_audio snd_usbmidi_lib snd_seq_midi psmouse snd_rawmidi snd_hda_intel snd_hda_codec snd_hwdep snd_seq_midi_event snd_pcm snd_seq lp ses uvcvideo videodev edac_core snd_timer pl2303 sp5100_tco enclosure v4l2_compat_ioctl32 hid_logitech_dj snd_seq_device usbserial snd soundcore i2c_piix4 edac_mce_amd asus_atk0110 joydev fglrx(P) mac_hid snd_page_alloc k10temp wmi serio_raw parport usb_storage usbhid hid pata_atiixp sky2 [last unloaded: vboxdrv]
Nov 15 00:24:38 lister kernel: [578296.072166]
Nov 15 00:24:38 lister kernel: [578296.072171] Pid: 30662, comm: umount Tainted: P O 3.2.0-32-generic #51-Ubuntu System manufacturer System Product Name/M3A78-T
Nov 15 00:24:38 lister kernel: [578296.072180] RIP: 0010:[<ffffffff8103dc4d>] [<ffffffff8103dc4d>] __ticket_spin_lock+0xd/0x30
Nov 15 00:24:38 lister kernel: [578296.072193] RSP: 0018:ffff88017c747e28 EFLAGS: 00000282
Nov 15 00:24:38 lister kernel: [578296.072197] RAX: 00000000b9d0b9d0 RBX: ffff880100000000 RCX: 0000000000000002
Nov 15 00:24:38 lister kernel: [578296.072201] RDX: 000000000000b9cf RSI: ffff88002f227830 RDI: ffff88002f226de0
Nov 15 00:24:38 lister kernel: [578296.072204] RBP: ffff88017c747e28 R08: 0000000000000000 R09: 0000000000000000
Nov 15 00:24:38 lister kernel: [578296.072208] R10: 0000000000001000 R11: 0000000000000000 R12: ffff88017c747d90
Nov 15 00:24:38 lister kernel: [578296.072212] R13: ffff88017c747d80 R14: ffff88017c747d80 R15: 0000000091827364
Nov 15 00:24:38 lister kernel: [578296.072216] FS: 00007fdd7889e800(0000) GS:ffff88022fc00000(0000) knlGS:00000000f75786c0
Nov 15 00:24...

Running as a VM appliance:

Feb 25 09:02:48 OURHOST kernel: [253017.087819] BUG: soft lockup - CPU#1 stuck for 23s! [jbd2/dm-0-8:256]
Feb 25 09:02:49 OURHOST kernel: [253017.087920] BUG: soft lockup - CPU#0 stuck for 23s! [postgres:11401]
Feb 25 09:02:49 OURHOST kernel: [253017.176442] Modules linked in: ext2 psmouse
Feb 25 09:02:49 OURHOST kernel: [253017.547731] Modules linked in: ext2 psmouse ppdev vmw_balloon ppdev vmw_balloon vmwgfx vmwgfx serio_raw serio_raw parport_pc parport_pc shpchp shpchp i2c_piix4 i2c_piix4 ttm mac_hid ttm mac_hid drm drm lp lp parport vmxnet3 vmw_pvscsi floppy
Feb 25 09:02:50 OURHOST kernel: [253017.907797] CPU 1 parport vmxnet3
Feb 25 09:02:50 OURHOST kernel: [253017.907802] Modules linked in: vmw_pvscsi ext2 floppy
Feb 25 09:02:50 OURHOST kernel: [253017.907806] psmouseCPU 0
Feb 25 09:02:50 OURHOST kernel: [253017.907808] Modules linked in: ext2 psmouse ppdev ppdev vmw_balloon vmwgfx vmw_balloon vmwgfx serio_raw serio_raw parport_pc parport_pc shpchp shpchp i2c_piix4 i2c_piix4 ttm ttm mac_hid mac_hid drm drm lp lp parport vmxnet3 vmw_pvscsi floppy
Feb 25 09:02:50 OURHOST kernel: [253017.907828] parport
Feb 25 09:02:50 OURHOST kernel: [253017.907830] vmxnet3 vmw_pvscsi floppy
Feb 25 09:02:50 OURHOST kernel: [253017.907832]
Feb 25 09:02:50 OURHOST kernel: [253017.943844] Pid: 256, comm: jbd2/dm-0-8 Not tainted 3.2.0-37-generic #58-Ubuntu VMware, Inc. VMware Virtual Platform
Feb 25 09:02:50 OURHOST kernel: [253017.970349] Pid: 11401, comm: postgres Not tainted 3.2.0-37-generic #58-Ubuntu VMware, Inc. VMware Virtual Platform/440BX Desktop Reference Platform
Feb 25 09:02:50 OURHOST kernel: [253017.970360] RIP: 0010:[<ffffffff81660dfa>] /440BX Desktop Reference Platform
Feb 25 09:02:50 OURHOST kernel: [253018.714895] [<ffffffff81660dfa>] do_page_fault+0x1fa/0x520
Feb 25 09:02:50 OURHOST kernel: [253018.714901] RIP: 0010:[<ffffffff811a9ae7>] [<ffffffff811a9ae7>] __find_get_block_slow+0xa7/0x190
Feb 25 09:02:50 OURHOST kernel: [253019.017738] RSP: 0018:ffff88001215da98 EFLAGS: 00000202
Feb 25 09:02:50 OURHOST kernel: [253019.017742] RAX: 0000000000000000 RBX: 000000000000c350 RCX: ffffffff8165d76d
Feb 25 09:02:51 OURHOST kernel: [253019.017745] RSP: 0018:ffff880326a03bf0 EFLAGS: 00010202
Feb 25 09:02:51 OURHOST kernel: [253019.017747] RAX: ffff8802a16ffc98 RBX: 000000000000761c RCX: ffff8802a16ffc98
Feb 25 09:02:51 OURHOST kernel: [253019.017750] RDX: 000000000000d950 RSI: 0000000000000001 RDI: ffff880332c27d20
Feb 25 09:02:51 OURHOST kernel: [253019.017752] RBP: ffff880326a03c60 R08: ffffea0000b9941c R09: ffff880319fb1728
Feb 25 09:02:51 OURHOST kernel: [253019.017755] R10: fcb7e8e81df89a00 R11: 0000000000000000 R12: ffff880326a03ba0
Feb 25 09:02:51 OURHOST kernel: [253019.017757] R13: ffffffff00000020 R14: 000000010000761c R15: 0000000000b0f61c
Feb 25 09:02:51 OURHOST kernel: [253019.017760] RDX: 0000000000000000 RSI: 0000000000000002 RDI: ffff88001215dba8
Feb 25 09:02:51 OURHOST kernel: [253019.017762] FS: 0000000000000000(0000) GS:ffff88033fd00000(0000) knlGS:0000000000000000
Feb 25 09:02:51 OURHOST kernel: [253019.017765] CS: 0010 DS: 0000 ES: 0000 CR0: 000000008005003b
Feb 25 09:02:51 OURHOST kernel: ...

Pachy, this bug was reported a while ago and there hasn't been any activity in it recently. We were wondering if this is still an issue? If so, could you please test for this with the latest development release of Ubuntu? ISO images are available from http://cdimage.ubuntu.com/daily-live/current/ .

If it remains an issue, could you please run the following command in the development release from a Terminal (Applications->Accessories->Terminal), as it will automatically gather and attach updated debug information to this report:

apport-collect -p linux <replace-with-bug-number>

Also, could you please test the latest upstream kernel available following https://wiki.ubuntu.com/KernelMainlineBuilds ? It will allow additional upstream developers to examine the issue. Please do not test the daily folder, but the one all the way at the bottom. Once you've tested the upstream kernel, please comment on which kernel version specifically you tested. If this bug is fixed in the mainline kernel, please add the following tags:
kernel-fixed-upstream
kernel-fixed-upstream-VERSION-NUMBER

where VERSION-NUMBER is the version number of the kernel you tested. For example:
kernel-fixed-upstream-v3.11-rc5

This can be done by clicking on the yellow circle with a black pencil icon next to the word Tags located at the bottom of the bug description. As well, please remove the tag:
needs-upstream-testing

If the mainline kernel does not fix this bug, please add the following tags:
kernel-bug-exists-upstream
kernel-bug-exists-upstream-VERSION-NUMBER

As well, please remove the tag:
needs-upstream-testing

Once testing of the upstream kernel is complete, please mark this bug's Status as Confirmed. Please let us know your results. Thank you for your understanding.

Please don't squish this bug; other users may have experienced it. Give them time to reply; I no longer possess the system in question.

Missing all information from https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1011914/comments/18 .

I am facing something similar. I am already struggling with an issue on this Tyan S3970 (Ubuntu 12.04.03 fully updated), which I am in the process of reporting here:
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1217229

I have a pair of system disks (raid/luks) which I am able to boot. I have a pair of data disks (raid) which, when attacked to the sata controller (along with the system disks) lead to a boot failure and drops me into busybox. When I hit control-d to continue the boot, I get stuff that looks like:

BUG: soft lockup - CUP#7 stuck for 23s! [kworker/7:0:469]
BUG: soft lockup - CUP#7 stuck for 22s! [kworker/7:0:469]
INFO: rcu_sched self-detected stall on CUP { 7} (t=15000 jiffies)
INFO: rcu_sched detected stalls on CPUs/tasks; { 7} (detected by 2, t=15004 jiffies)
INFO: Stall ended before state dump start

I have posted pictures of my screen. The first pic is of one boot. The second pair is of a second boot, both using Ctl-D from busybox:
https://www.dropbox.com/sh/whypnvtkzkdyx3p/u3bnQQBqjb

One more piece of information: When I first booted with all 4 disks attached (zero'th boot, if you like), I was successful. I tried to mount the data disks and got a degraded array. That was odd, as I checked and the disk health was reported as good/healthy for both disks. Also, I had been watching the disks and there has been no sign of either disk developing problems. It's when I shut down and rebooted that I found myself getting dropped into busybox and took the first picture.

More information on my machine is located at the above bug report.

I'll add that if you google: kworker "bug soft lockup"

You will find similar issues reported on the suse and red hat reporting systems, including one that claims to have provided a fix:
https://bugzilla.redhat.com/show_bug.cgi?id=879252

DiagonalArg, this report wouldn't have anything to do with your problem. Please continue to comment in your report 1217229 so it may get addressed as soon as possible.

Thank you for your understanding.