[LTCTest][Kernel][OP810]Ubuntu14.04.3: kernel call trace while continuously switching between smt on/off and changing subcores

[bugproxy]

== Comment: #0 - Satheesh Rajendran <email address hidden> - 2015-07-14 02:32:22 ==
While running the below script, and nothing else was running in the system, host got the kernel call traces after around 15~20 mins

#!/bin/bash -x
while true;
do for i in 1 2 4;
do ppc64_cpu --subcores-per-core=$i;
ppc64_cpu --info
ppc64_cpu --smt=off;
ppc64_cpu --info
sleep 1;
lscpu
ppc64_cpu --smt=on;
ppc64_cpu --info
sleep 1;
lscpu
done;
sleep 1;
done

Environment:
------------------
$ cat /etc/issue
Ubuntu 14.04.2 LTS \n \l

$ uname -a
Linux tul8fp 3.19.0-22-generic #22~14.04.1-Ubuntu SMP Wed Jun 17 10:03:39 UTC 2015 ppc64le ppc64le ppc64le GNU/Linux

$ lscpu
Architecture: ppc64le
Byte Order: Little Endian
CPU(s): 160
On-line CPU(s) list: 0,4,8,12,16,20,24,28,32,36,40,44,48,52,56,60,64,68,72,76,80,84,88,92,96,100,104,108,112,116,120,124,128,132,136,138-159
Off-line CPU(s) list: 1-3,5-7,9-11,13-15,17-19,21-23,25-27,29-31,33-35,37-39,41-43,45-47,49-51,53-55,57-59,61-63,65-67,69-71,73-75,77-79,81-83,85-87,89-91,93-95,97-99,101-103,105-107,109-111,113-115,117-119,121-123,125-127,129-131,133-135,137
Thread(s) per core: 2
Core(s) per socket: 10
Socket(s): 2
NUMA node(s): 2
Model: 8335-GTA
L1d cache: 64K
L1i cache: 32K
L2 cache: 512K
L3 cache: 8192K
NUMA node0 CPU(s): 0,4,88,92,96,100,104,108,112,116,120,124,128,132,136,138-159
NUMA node8 CPU(s): 8,12,16,20,24,28,32,36,40,44,48,52,56,60,64,68,72,76,80,84

$ tail -10 /proc/cpuinfo
processor : 159
cpu : POWER8 (raw), altivec supported
clock : 2693.000000MHz
revision : 2.0 (pvr 004d 0200)

timebase : 512000000
platform : PowerNV
model : 8335-GTA
machine : PowerNV 8335-GTA
firmware : OPAL v3

Logs:-
---------

# dmesg
[79081.074088] INFO: task irqbalance:1897 blocked for more than 120 seconds.
[79081.074333] Not tainted 3.19.0-22-generic #22~14.04.1-Ubuntu
[79081.074388] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
[79081.074449] irqbalance D 00003fff9ac39d3c 0 1897 1 0x00040000
[79081.074454] Call Trace:
[79081.074470] [c0000007e8d035f0] [00003fff9af50000] 0x3fff9af50000 (unreliable)
[79081.074477] [c0000007e8d037c0] [c000000000015934] __switch_to+0x204/0x350
[79081.074482] [c0000007e8d03820] [c000000000a11508] __schedule+0x368/0x8d0
[79081.074486] --- interrupt: 1000ba30 at 0xc0000007e8d039f0
[79081.074486] LR = 0x10026a6c1d0
[79081.074490] [c0000007e8d03a40] [c000000000a120a0] schedule_preempt_disabled+0x20/0x30 (unreliable)
[79081.074494] [c0000007e8d03a60] [c000000000a1420c] __mutex_lock_slowpath+0xfc/0x1f0
[79081.074497] [c0000007e8d03ae0] [c000000000a1436c] mutex_lock+0x6c/0x70
[79081.074501] [c0000007e8d03b10] [c00000000064488c] online_show+0x3c/0x90
[79081.074503] [c0000007e8d03b90] [c000000000644fec] dev_attr_show+0x5c/0xc0
[79081.074508] [c0000007e8d03bd0] [c00000000035b7f4] sysfs_kf_seq_show+0x114/0x200
[79081.074511] [c0000007e8d03c20] [c0000000003591e4] kernfs_seq_show+0x54/0x70
[79081.074515] [c0000007e8d03c50] [c0000000002e74fc] seq_read+0xec/0x500
[79081.074519] [c0000007e8d03cf0] [c00000000035a474] kernfs_fop_read+0x184/0x220
[79081.074523] [c0000007e8d03d50] [c0000000002b520c] __vfs_read+0x6c/0x120
[79081.074527] [c0000007e8d03d90] [c0000000002b5364] vfs_read+0xa4/0x1c0
[79081.074530] [c0000007e8d03de0] [c0000000002b54ec] SyS_read+0x6c/0x110
[79081.074534] [c0000007e8d03e30] [c000000000009258] system_call+0x38/0xd0
[79081.074546] INFO: task ppc64_cpu:111047 blocked for more than 120 seconds.
[79081.074597] Not tainted 3.19.0-22-generic #22~14.04.1-Ubuntu
[79081.074802] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
[79081.074865] ppc64_cpu D 00003fff82892d08 0 111047 109995 0x00040000
[79081.074868] Call Trace:
[79081.074871] [c000000f1c67f680] [c000000f1c67f710] 0xc000000f1c67f710 (unreliable)
[79081.074875] [c000000f1c67f850] [c000000000015934] __switch_to+0x204/0x350
[79081.074878] [c000000f1c67f8b0] [c000000000a11508] __schedule+0x368/0x8d0
[79081.074882] [c000000f1c67fad0] [c0000000000aff10] cpu_hotplug_begin+0xa0/0xb0
[79081.074887] [c000000f1c67fb10] [c00000000020b0a0] _cpu_down+0xb0/0x3a0
[79081.074890] [c000000f1c67fbd0] [c00000000020b3e8] cpu_down+0x58/0xa0
[79081.074894] [c000000f1c67fc00] [c00000000064fa0c] cpu_subsys_offline+0x2c/0x50
[79081.074897] [c000000f1c67fc30] [c000000000647aa4] device_offline+0x104/0x140
[79081.074900] [c000000f1c67fc70] [c000000000647c6c] online_store+0x6c/0xc0
[79081.074904] [c000000f1c67fcc0] [c000000000643ab8] dev_attr_store+0x68/0xa0
[79081.074907] [c000000f1c67fd00] [c00000000035b350] sysfs_kf_write+0x80/0xb0
[79081.074910] [c000000f1c67fd40] [c00000000035a28c] kernfs_fop_write+0x18c/0x1f0
[79081.074914] [c000000f1c67fd90] [c0000000002b474c] vfs_write+0xdc/0x260
[79081.074917] [c000000f1c67fde0] [c0000000002b55fc] SyS_write+0x6c/0x110
[79081.074921] [c000000f1c67fe30] [c000000000009258] system_call+0x38/0xd0
[79201.074065] INFO: task irqbalance:1897 blocked for more than 120 seconds.
[79201.074312] Not tainted 3.19.0-22-generic #22~14.04.1-Ubuntu
[79201.074361] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
[79201.074421] irqbalance D 00003fff9ac39d3c 0 1897 1 0x00040000
[79201.074424] Call Trace:
[79201.074428] [c0000007e8d035f0] [00003fff9af50000] 0x3fff9af50000 (unreliable)
[79201.074432] [c0000007e8d037c0] [c000000000015934] __switch_to+0x204/0x350
[79201.074436] [c0000007e8d03820] [c000000000a11508] __schedule+0x368/0x8d0
[79201.074439] --- interrupt: 1000ba30 at 0xc0000007e8d039f0
[79201.074439] LR = 0x10026a6c1d0
[79201.074443] [c0000007e8d03a40] [c000000000a120a0] schedule_preempt_disabled+0x20/0x30 (unreliable)
[79201.074447] [c0000007e8d03a60] [c000000000a1420c] __mutex_lock_slowpath+0xfc/0x1f0
[79201.074450] [c0000007e8d03ae0] [c000000000a1436c] mutex_lock+0x6c/0x70
[79201.074453] [c0000007e8d03b10] [c00000000064488c] online_show+0x3c/0x90
[79201.074456] [c0000007e8d03b90] [c000000000644fec] dev_attr_show+0x5c/0xc0
[79201.074459] [c0000007e8d03bd0] [c00000000035b7f4] sysfs_kf_seq_show+0x114/0x200
[79201.074462] [c0000007e8d03c20] [c0000000003591e4] kernfs_seq_show+0x54/0x70
[79201.074465] [c0000007e8d03c50] [c0000000002e74fc] seq_read+0xec/0x500
[79201.074468] [c0000007e8d03cf0] [c00000000035a474] kernfs_fop_read+0x184/0x220
[79201.074472] [c0000007e8d03d50] [c0000000002b520c] __vfs_read+0x6c/0x120
[79201.074475] [c0000007e8d03d90] [c0000000002b5364] vfs_read+0xa4/0x1c0
[79201.074479] [c0000007e8d03de0] [c0000000002b54ec] SyS_read+0x6c/0x110
[79201.074482] [c0000007e8d03e30] [c000000000009258] system_call+0x38/0xd0
[79201.074499] INFO: task ppc64_cpu:111047 blocked for more than 120 seconds.
[79201.074638] Not tainted 3.19.0-22-generic #22~14.04.1-Ubuntu
[79201.074726] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
[79201.074786] ppc64_cpu D 00003fff82892d08 0 111047 109995 0x00040000
[79201.074789] Call Trace:
[79201.074792] [c000000f1c67f680] [c000000f1c67f710] 0xc000000f1c67f710 (unreliable)
[79201.074795] [c000000f1c67f850] [c000000000015934] __switch_to+0x204/0x350
[79201.074798] [c000000f1c67f8b0] [c000000000a11508] __schedule+0x368/0x8d0
[79201.074802] [c000000f1c67fad0] [c0000000000aff10] cpu_hotplug_begin+0xa0/0xb0
[79201.074805] [c000000f1c67fb10] [c00000000020b0a0] _cpu_down+0xb0/0x3a0
[79201.074808] [c000000f1c67fbd0] [c00000000020b3e8] cpu_down+0x58/0xa0
[79201.074811] [c000000f1c67fc00] [c00000000064fa0c] cpu_subsys_offline+0x2c/0x50
[79201.074814] [c000000f1c67fc30] [c000000000647aa4] device_offline+0x104/0x140
[79201.074817] [c000000f1c67fc70] [c000000000647c6c] online_store+0x6c/0xc0
[79201.074821] [c000000f1c67fcc0] [c000000000643ab8] dev_attr_store+0x68/0xa0
[79201.074824] [c000000f1c67fd00] [c00000000035b350] sysfs_kf_write+0x80/0xb0
[79201.074827] [c000000f1c67fd40] [c00000000035a28c] kernfs_fop_write+0x18c/0x1f0
[79201.074831] [c000000f1c67fd90] [c0000000002b474c] vfs_write+0xdc/0x260
[79201.074834] [c000000f1c67fde0] [c0000000002b55fc] SyS_write+0x6c/0x110
[79201.074837] [c000000f1c67fe30] [c000000000009258] system_call+0x38/0xd0
[79321.074029] INFO: task irqbalance:1897 blocked for more than 120 seconds.
[79321.074269] Not tainted 3.19.0-22-generic #22~14.04.1-Ubuntu
[79321.074319] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
[79321.074378] irqbalance D 00003fff9ac39d3c 0 1897 1 0x00040000
[79321.074382] Call Trace:
[79321.074386] [c0000007e8d035f0] [00003fff9af50000] 0x3fff9af50000 (unreliable)
[79321.074390] [c0000007e8d037c0] [c000000000015934] __switch_to+0x204/0x350
[79321.074393] [c0000007e8d03820] [c000000000a11508] __schedule+0x368/0x8d0
[79321.074396] --- interrupt: 1000ba30 at 0xc0000007e8d039f0
[79321.074396] LR = 0x10026a6c1d0
[79321.074400] [c0000007e8d03a40] [c000000000a120a0] schedule_preempt_disabled+0x20/0x30 (unreliable)
[79321.074404] [c0000007e8d03a60] [c000000000a1420c] __mutex_lock_slowpath+0xfc/0x1f0
[79321.074407] [c0000007e8d03ae0] [c000000000a1436c] mutex_lock+0x6c/0x70
[79321.074410] [c0000007e8d03b10] [c00000000064488c] online_show+0x3c/0x90
[79321.074412] [c0000007e8d03b90] [c000000000644fec] dev_attr_show+0x5c/0xc0
[79321.074416] [c0000007e8d03bd0] [c00000000035b7f4] sysfs_kf_seq_show+0x114/0x200
[79321.074419] [c0000007e8d03c20] [c0000000003591e4] kernfs_seq_show+0x54/0x70
[79321.074422] [c0000007e8d03c50] [c0000000002e74fc] seq_read+0xec/0x500
[79321.074425] [c0000007e8d03cf0] [c00000000035a474] kernfs_fop_read+0x184/0x220
[79321.074429] [c0000007e8d03d50] [c0000000002b520c] __vfs_read+0x6c/0x120
[79321.074432] [c0000007e8d03d90] [c0000000002b5364] vfs_read+0xa4/0x1c0
[79321.074436] [c0000007e8d03de0] [c0000000002b54ec] SyS_read+0x6c/0x110
[79321.074439] [c0000007e8d03e30] [c000000000009258] system_call+0x38/0xd0
[79321.074453] INFO: task ppc64_cpu:111047 blocked for more than 120 seconds.

== Comment: #1 - Satheesh Rajendran <email address hidden> - 2015-07-14 02:34:55 ==
Tried to get sosreport but the same got stuck during info gathering at processor.

# sosreport
...
Please enter your first initial and last name [tul8fp]: satheesh
Please enter the case number that you are generating this report for: trace

 Running plugins. Please wait ...

  Running 51/64: processor...

== Comment: #3 - Ranjal G. Shenoy <email address hidden> - 2015-07-14 05:18:17 ==
Hi Sandhya,

From the call trace it looks like ppc64_task which is trying to offline a cpu is blocked inside cpu_hotplug_begin(). This happens when someone else is trying to prevent a cpu-hotplug using the get_online_cpus()/put_online_cpus() call. It is not clear from the logs what is that entity that's preventing this.

That said, I don't think the patch that you are referring to has anything to do with it. The problem lies elsewhere. If you see that the ppc64_cpu task is not making any progress at all, then it might be prudent to enable lockdep which will at least list out all the locks that are held at any point.

== Comment: #4 - Ranjal G. Shenoy <email address hidden> - 2015-07-14 05:48:39 ==
(In reply to comment #3)
> Hi Sandhya,
>
> From the call trace it looks like ppc64_task which is trying to offline a
> cpu is blocked inside cpu_hotplug_begin(). This happens when someone else is
> trying to prevent a cpu-hotplug using the
> get_online_cpus()/put_online_cpus() call. It is not clear from the logs what
> is that entity that's preventing this.
>
> That said, I don't think the patch that you are referring to has anything
> to do with it. The problem lies elsewhere. If you see that the ppc64_cpu
> task is not making any progress at all, then it might be prudent to enable
> lockdep which will at least list out all the locks that are held at any
> point.

To add to that, I recall seeing a similar issue where cpu-offline operation was blocking inside cpu_hotplug_begin. The fix for that is present in the mainline with commit id : 87af9e7ff9. You can try backporting that one.

== Comment: #13 - Satheesh Rajendran <email address hidden> - 2015-07-27 12:06:19 ==
Ran script mentioned in bug description continuously for 6 hours and not have seen the mentioned call traces.

Once this fix is available as part of ubuntu14.04.3 released kernel, this bug can be closed.

Thanks in advance.

Regards,
-Satheesh.

== Comment: #14 - Brahadambal Srinivasan <email address hidden> - 2015-08-04 09:31:21 ==
Cherry picked bug backported to the trusty kernel to resolve the issue reported in this bug

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Default Comment by Bridge

[bugproxy (bugproxy)]

Default Comment by Bridge

[Ubuntu Foundations Team Bug Bot (crichton)]

Thank you for taking the time to report this bug and helping to make Ubuntu better. It seems that your bug report is not filed about a specific source package though, rather it is just filed against Ubuntu in general. It is important that bug reports be filed about source packages so that people interested in the package can find the bugs about it. You can find some hints about determining what package your bug might be about at https://wiki.ubuntu.com/Bugs/FindRightPackage. You might also ask for help in the #ubuntu-bugs irc channel on Freenode.

To change the source package that this bug is filed about visit https://bugs.launchpad.net/ubuntu/+bug/1481357/+editstatus and add the package name in the text box next to the word Package.

[This is an automated message. I apologize if it reached you inappropriately; please just reply to this message indicating so.]

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------- Comment From <email address hidden> 2016-01-26 14:28 EDT-------
*** Bug 128070 has been marked as a duplicate of this bug. ***

[Tim Gardner (timg-tpi)]

https://lists.ubuntu.com/archives/kernel-team/2016-January/070030.html

[Brad Figg (brad-figg)]

This bug is awaiting verification that the kernel in -proposed solves the problem. Please test the kernel and update this bug with the results. If the problem is solved, change the tag 'verification-needed-vivid' to 'verification-done-vivid'.

If verification is not done by 5 working days from today, this fix will be dropped from the source code, and this bug will be closed.

See https://wiki.ubuntu.com/Testing/EnableProposed for documentation how to enable and use -proposed. Thank you!

[bugproxy (bugproxy)]

Default Comment by Bridge

[Tim Gardner (timg-tpi)]

This patch has already been backported for 3.19 and will be released with Ubuntu-3.19.0-50.56 (currently in -proposed)

[bugproxy (bugproxy)]

------- Comment From <email address hidden> 2016-02-08 13:16 EDT-------
You need to get this kernel from the -proposed archive, please enable the proposed repository and download kernel 3.19 specifically, as:

# apt-get install linux-image-3.19.0-50-generic

[bugproxy (bugproxy)]

------- Comment From <email address hidden> 2016-02-18 03:18 EDT-------
Provided 3.19.0-50-generic linux kernel image is not bootable in my machine, as it does not have the ipr module in initramfs, hence failing to find the root disk.

Steps:
1. Installed 3.19.0-50-generic kernel
2. reboot, choose the above kernel/ kexec to the above kernel
----> both result in below error

Begin: Mounting root file system ... Begin: Running /scripts/local-top ... done.
Gave up waiting for root device. Common problems:
- Boot args (cat /proc/cmdline)
- Check rootdelay= (did the system wait long enough?)
- Check root= (did the system wait for the right device?)
- Missing modules (cat /proc/modules; ls /dev)
ALERT! /dev/disk/by-uuid/1e999814-80ae-4ef9-89a0-c7fda8d968c5 does not exist. Dropping to a shell!

BusyBox v1.21.1 (Ubuntu 1:1.21.0-1ubuntu1) built-in shell (ash)
Enter 'help' for a list of built-in commands.

(initramfs)

3. Tried boot back to 4.2 kernel, it is working fine
4. extracted and compared the initramfs content and found 4.2 kernel has ipr in modules.dep whereas 3.19.0-50-generic does not have.

Pls provide updated kernel image to proceed with tests.
Thanks inadvance.

output of extracted initramfs
????
# grep -r ipr 4.2/*
Binary file 4.2/bin/busybox matches
Binary file 4.2/initrd.img-4.2.0-27-generic matches
Binary file 4.2/initrd.img-4.2.0-27-generic.bk matches
Binary file 4.2/lib/powerpc64le-linux-gnu/libtinfo.so.5 matches
Binary file 4.2/lib/powerpc64le-linux-gnu/libc.so.6 matches
4.2/lib/modules/4.2.0-27-generic/modules.dep:kernel/drivers/scsi/ipr.ko:
Binary file 4.2/lib/modules/4.2.0-27-generic/modules.dep.bin matches
4.2/lib/modules/4.2.0-27-generic/modules.alias:alias pci:v00001014d0000034Asv00001014sd000004C9bc*sc*i* ipr
...
4.2/lib/modules/4.2.0-27-generic/modules.alias:alias pci:v00001069d0000B166sv00001014sd00000266bc*sc*i* ipr
Binary file 4.2/lib/modules/4.2.0-27-generic/kernel/drivers/scsi/megaraid/megaraid_sas.ko matches
Binary file 4.2/lib/modules/4.2.0-27-generic/kernel/drivers/scsi/libsas/libsas.ko matches
Binary file 4.2/lib/modules/4.2.0-27-generic/kernel/drivers/scsi/ipr.ko matches
Binary file 4.2/lib/modules/4.2.0-27-generic/kernel/drivers/net/ethernet/jme.ko matches
4.2/lib/modules/4.2.0-27-generic/modules.order:kernel/drivers/scsi/ipr.ko
4.2/lib/modules/4.2.0-27-generic/modules.order:kernel/drivers/mtd/chips/chipreg.ko
4.2/lib/modules/4.2.0-27-generic/modules.order:kernel/net/netfilter/xt_iprange.ko
Binary file 4.2/lib/modules/4.2.0-27-generic/modules.alias.bin matches
?????
# grep -r ipr 3.19/*
Binary file 3.19/bin/busybox matches
Binary file 3.19/initrd.img-3.19.0-50-generic matches
Binary file 3.19/lib/powerpc64le-linux-gnu/libtinfo.so.5 matches
Binary file 3.19/lib/powerpc64le-linux-gnu/libc.so.6 matches
Binary file 3.19/lib/modules/3.19.0-50-generic/kernel/drivers/scsi/libsas/libsas.ko matches
3.19/lib/modules/3.19.0-50-generic/modules.order:kernel/drivers/scsi/ipr.ko
3.19/lib/modules/3.19.0-50-generic/modules.order:kernel/drivers/mtd/chips/chipreg.ko
3.19/lib/modules/3.19.0-50-generic/modules.order:kernel/net/netfilter/xt_iprange.ko

#lsscsi
...
[1:2:0:0] disk IBM IPR-0 5EC29900 /dev/sdc
[1:2:1:0...

[Launchpad Janitor (janitor)]

This bug was fixed in the package linux - 3.19.0-51.57

---------------
linux (3.19.0-51.57) vivid; urgency=low

  [ Seth Forshee ]

  * SAUCE: cred: Add clone_cred() interface
    - LP: #1531747, #1534961, #1535150
    - CVE-2016-1575 CVE-2016-1576
  * SAUCE: overlayfs: Use mounter's credentials instead of selectively
    raising caps
    - LP: #1531747, #1534961, #1535150
    - CVE-2016-1575 CVE-2016-1576
  * SAUCE: overlayfs: Skip permission checking for trusted.overlayfs.*
    xattrs
    - LP: #1531747, #1534961, #1535150
    - CVE-2016-1575 CVE-2016-1576
  * SAUCE: overlayfs: Be more careful about copying up sxid files
    - LP: #1534961, #1535150
    - CVE-2016-1575 CVE-2016-1576
  * SAUCE: overlayfs: Propogate nosuid from lower and upper mounts
    - LP: #1534961, #1535150
    - CVE-2016-1575 CVE-2016-1576

linux (3.19.0-50.56) vivid; urgency=low

  [ Brad Figg ]

  * Release Tracking Bug
    - LP: #1540576

  [ J. R. Okajima ]

  * SAUCE: ubuntu: aufs: tiny, extract a new func xino_fwrite_wkq()
    - LP: #1533043
  * SAUCE: ubuntu: aufs: for 4.3, XINO handles EINTR from the dying process
    - LP: #1533043

  [ John Johansen ]

  * SAUCE: (no-up): apparmor: fix for failed mediation of socket that is
    being shutdown
    - LP: #1446906

  [ Upstream Kernel Changes ]

  * drivers/base/memory.c: fix kernel warning during memory hotplug on
    ppc64
    - LP: #1463654
  * sched/wait: Fix signal handling in bit wait helpers
    - LP: #1537859
  * sched/wait: Fix the signal handling fix
    - LP: #1537859
  * ARC: Fix silly typo in MAINTAINERS file
    - LP: #1537859
  * ip6mr: call del_timer_sync() in ip6mr_free_table()
    - LP: #1537859
  * gre6: allow to update all parameters via rtnl
    - LP: #1537859
  * atl1c: Improve driver not to do order 4 GFP_ATOMIC allocation
    - LP: #1537859
  * sctp: use the same clock as if sock source timestamps were on
    - LP: #1537859
  * sctp: update the netstamp_needed counter when copying sockets
    - LP: #1537859
  * sctp: also copy sk_tsflags when copying the socket
    - LP: #1537859
  * net: qca_spi: fix transmit queue timeout handling
    - LP: #1537859
  * ipv6: sctp: clone options to avoid use after free
    - LP: #1537859
  * net: add validation for the socket syscall protocol argument
    - LP: #1537859
  * sh_eth: fix kernel oops in skb_put()
    - LP: #1537859
  * net: fix IP early demux races
    - LP: #1537859
  * vlan: Fix untag operations of stacked vlans with REORDER_HEADER off
    - LP: #1537859
  * skbuff: Fix offset error in skb_reorder_vlan_header
    - LP: #1537859
  * pptp: verify sockaddr_len in pptp_bind() and pptp_connect()
    - LP: #1537859
  * bluetooth: Validate socket address length in sco_sock_bind().
    - LP: #1537859
  * fou: clean up socket with kfree_rcu
    - LP: #1537859
  * af_unix: Revert 'lock_interruptible' in stream receive code
    - LP: #1537859
  * KEYS: Fix race between read and revoke
    - LP: #1537859
  * tools: Add a "make all" rule
    - LP: #1537859
  * efi: Disable interrupts around EFI calls, not in the epilog/prolog
    calls
    - LP: #1537859
  * fuse: break infinite loop in fuse_fill_write_pages()
    - LP: #1537859
  * usb: gadget: pxa2...

[bugproxy (bugproxy)]

------- Comment From <email address hidden> 2016-02-29 13:19 EDT-------
(In reply to comment #35)
> Provided 3.19.0-50-generic linux kernel image is not bootable in my
> machine, as it does not have the ipr module in initramfs, hence failing to
> find the root disk.

I just double check and kernel 3.19 (Ubuntu 14.04.3) is still supported until August. So, we need to have this fixed.

[Tim Gardner (timg-tpi)]

14.04.2 worked at some point, so what has changed ? The install failure seems unrelated to the original bug.

[Breno Leitão (breno-leitao)]

Tim,

From what I understand, it seems a regression from what we have in 14.04.2.

Satheesh, is it correct? Is this a regression?

[bugproxy (bugproxy)]

------- Comment From <email address hidden> 2016-03-07 19:07 EDT-------
(In reply to comment #35)
> Provided 3.19.0-50-generic linux kernel image is not bootable in my
> machine, as it does not have the ipr module in initramfs, hence failing to
> find the root disk.
>
..
...
>
> Regards,
> -Satheesh.

I hit similar problem when I installed 3.19.0-51-generic, but this problem can be fixed by installing the extra package:" linux-image-extra-3.19.0-51-generic"

[Tim Gardner (timg-tpi)]

Install linux-generic which depends on all of the required kernel packages.