Update2 for ocxl driver

[bugproxy]

== SRU Justification ==
This commit fixes a regression introduced by mainline commit
5ef3166e8a32. This commit is being requested by IBM as an update to the
ocxl driver.

This fix was also cc'd to upstream stable, but it is still in
linux-next.

== Fix ==
linux-next commit:
d497ebf5fb3a "(ocxl: Fix page fault handler in case of fault on dying process)"

== Regression Potential ==
Low. Limited to the ocxl driver. This commit fixes a current regression.
It was also cc'd to upstream stable, it has had additional upstream review.

== Test Case ==
A test kernel was built with this patch and tested by the original bug reporter.
The bug reporter states the test kernel resolved the bug.

== Comment: #0 - Frederic Barrat - 2018-07-12 09:56:29 ==
---Problem Description---
Update to ocxl driver

Contact Information = <email address hidden>

---uname output---
Linux zaiuslp14 4.15.0-24-generic #26-Ubuntu SMP Wed Jun 13 08:43:33 UTC 2018 ppc64le ppc64le ppc64le GNU/Linux

---Additional Hardware Info---
opencapi adapter

Machine Type = any Power9 with opencapi support

---Debugger---
A debugger is not configured

Stack trace output:
 no

Oops output:
 no

System Dump Info:
  The system is not configured to capture a system dump.

*Additional Instructions for <email address hidden>:
-Attach sysctl -a output output to the bug.

== Comment: #1 - Frederic Barrat - 2018-07-12 11:11:39 ==
Could we have the following fix backported to ubuntu 18.04? It's to address a problem in the relatively new ocxl driver

It's currently in the 'next' tree of the powerpc maintainer:
d497ebf5fb3a026c0817f8c96cde578787f24093 ocxl: Fix page fault handler in case of fault on dying process

https://git.kernel.org/pub/scm/linux/kernel/git/powerpc/linux.git/commit/?id=d497ebf5fb3a026c0817f8c96cde57

[Joseph Salisbury (jsalisbury)]

I built a Bionic test kernel with the patch from:
https://git.kernel.org/pub/scm/linux/kernel/git/powerpc/linux.git/commit/?id=d497ebf5fb3a026c0817f8c96cde57

The test kernel can be downloaded from:
http://kernel.ubuntu.com/~jsalisbury/lp1781436

Can you test this kernel and see if it resolves this bug?

Note about installing test kernels:
• If the test kernel is prior to 4.15(Bionic) you need to install the linux-image and linux-image-extra .deb packages.
• If the test kernel is 4.15(Bionic) or newer, you need to install the linux-modules, linux-modules-extra and linux-image-unsigned .deb packages.

Thanks in advance!

[bugproxy (bugproxy)]

------- Comment From <email address hidden> 2018-07-23 12:58 EDT-------
The test kernel found in
http://kernel.ubuntu.com/~jsalisbury/lp1781436
is for the wrong architecture (s390x instead of ppc64el).

Could you rebuild for ppc64el? Thanks

[Joseph Salisbury (jsalisbury)]

Sorry for that. There is a ppc64el kernel now posted:
http://kernel.ubuntu.com/~jsalisbury/lp1781436

[bugproxy (bugproxy)]

------- Comment From <email address hidden> 2018-07-25 09:30 EDT-------
Thanks for the new kernel and modules.
I've tested it, and the bug is indeed fixed. Thanks!

[Joseph Salisbury (jsalisbury)]

SRU request submitted:
https://lists.ubuntu.com/archives/kernel-team/2018-July/094422.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-bionic' to 'verification-done-bionic'. If the problem still exists, change the tag 'verification-needed-bionic' to 'verification-failed-bionic'.

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)]

------- Comment From <email address hidden> 2018-08-08 04:31 EDT-------
I tested kernel 4.15.0-31-generic found in -proposed and tests passed. I also checked the source tree.

[Launchpad Janitor (janitor)]

This bug was fixed in the package linux - 4.17.0-7.8

---------------
linux (4.17.0-7.8) cosmic; urgency=medium

  * linux: 4.17.0-7.8 -proposed tracker (LP: #1785242)

  * Cosmic update to 4.17.12 stable release (LP: #1785211)
    - spi: spi-s3c64xx: Fix system resume support
    - Input: elan_i2c - add ACPI ID for lenovo ideapad 330
    - Input: i8042 - add Lenovo LaVie Z to the i8042 reset list
    - Input: elan_i2c - add another ACPI ID for Lenovo Ideapad 330-15AST
    - mm: disallow mappings that conflict for devm_memremap_pages()
    - kvm, mm: account shadow page tables to kmemcg
    - delayacct: fix crash in delayacct_blkio_end() after delayacct init failure
    - tracing: Fix double free of event_trigger_data
    - tracing: Fix possible double free in event_enable_trigger_func()
    - kthread, tracing: Don't expose half-written comm when creating kthreads
    - tracing/kprobes: Fix trace_probe flags on enable_trace_kprobe() failure
    - tracing: Quiet gcc warning about maybe unused link variable
    - arm64: fix vmemmap BUILD_BUG_ON() triggering on !vmemmap setups
    - drm/i915/glk: Add Quirk for GLK NUC HDMI port issues.
    - mlxsw: spectrum_switchdev: Fix port_vlan refcounting
    - kcov: ensure irq code sees a valid area
    - mm: check for SIGKILL inside dup_mmap() loop
    - drm/amd/powerplay: Set higher SCLK&MCLK frequency than dpm7 in OD (v2)
    - xen/netfront: raise max number of slots in xennet_get_responses()
    - hv_netvsc: fix network namespace issues with VF support
    - skip LAYOUTRETURN if layout is invalid
    - ixgbe: Fix setting of TC configuration for macvlan case
    - ALSA: emu10k1: add error handling for snd_ctl_add
    - ALSA: fm801: add error handling for snd_ctl_add
    - NFSv4.1: Fix the client behaviour on NFS4ERR_SEQ_FALSE_RETRY
    - nfsd: fix error handling in nfs4_set_delegation()
    - nfsd: fix potential use-after-free in nfsd4_decode_getdeviceinfo
    - vfio: platform: Fix reset module leak in error path
    - vfio/mdev: Check globally for duplicate devices
    - vfio/type1: Fix task tracking for QEMU vCPU hotplug
    - kernel/hung_task.c: show all hung tasks before panic
    - mem_cgroup: make sure moving_account, move_lock_task and stat_cpu in the
      same cacheline
    - mm: /proc/pid/pagemap: hide swap entries from unprivileged users
    - mm: vmalloc: avoid racy handling of debugobjects in vunmap
    - mm/slub.c: add __printf verification to slab_err()
    - rtc: ensure rtc_set_alarm fails when alarms are not supported
    - rxrpc: Fix terminal retransmission connection ID to include the channel
    - perf tools: Fix pmu events parsing rule
    - netfilter: ipset: forbid family for hash:mac sets
    - netfilter: ipset: List timing out entries with "timeout 1" instead of zero
    - irqchip/ls-scfg-msi: Map MSIs in the iommu
    - watchdog: da9063: Fix updating timeout value
    - media: arch: sh: migor: Fix TW9910 PDN gpio
    - printk: drop in_nmi check from printk_safe_flush_on_panic()
    - bpf, arm32: fix inconsistent naming about emit_a32_lsr_{r64,i64}
    - ceph: fix alignment of rasize
    - ceph: fix use-after-free in ceph_statfs()
    - e1000e: Ignore TSYNCRXCTL when getting I219...

[Launchpad Janitor (janitor)]

This bug was fixed in the package linux - 4.15.0-33.36

---------------
linux (4.15.0-33.36) bionic; urgency=medium

  * linux: 4.15.0-33.36 -proposed tracker (LP: #1787149)

  * RTNL assertion failure on ipvlan (LP: #1776927)
    - ipvlan: drop ipv6 dependency
    - ipvlan: use per device spinlock to protect addrs list updates
    - SAUCE: fix warning from "ipvlan: drop ipv6 dependency"

  * ubuntu_bpf_jit test failed on Bionic s390x systems (LP: #1753941)
    - test_bpf: flag tests that cannot be jited on s390

  * HDMI/DP audio can't work on the laptop of Dell Latitude 5495 (LP: #1782689)
    - drm/nouveau: fix nouveau_dsm_get_client_id()'s return type
    - drm/radeon: fix radeon_atpx_get_client_id()'s return type
    - drm/amdgpu: fix amdgpu_atpx_get_client_id()'s return type
    - platform/x86: apple-gmux: fix gmux_get_client_id()'s return type
    - ALSA: hda: use PCI_BASE_CLASS_DISPLAY to replace PCI_CLASS_DISPLAY_VGA
    - vga_switcheroo: set audio client id according to bound GPU id

  * locking sockets broken due to missing AppArmor socket mediation patches
    (LP: #1780227)
    - UBUNTU SAUCE: apparmor: fix apparmor mediating locking non-fs, unix sockets

  * Update2 for ocxl driver (LP: #1781436)
    - ocxl: Fix page fault handler in case of fault on dying process

  * netns: unable to follow an interface that moves to another netns
    (LP: #1774225)
    - net: core: Expose number of link up/down transitions
    - dev: always advertise the new nsid when the netns iface changes
    - dev: advertise the new ifindex when the netns iface changes

  * [Bionic] Disk IO hangs when using BFQ as io scheduler (LP: #1780066)
    - block, bfq: fix occurrences of request finish method's old name
    - block, bfq: remove batches of confusing ifdefs
    - block, bfq: add requeue-request hook

  * HP ProBook 455 G5 needs mute-led-gpio fixup (LP: #1781763)
    - ALSA: hda: add mute led support for HP ProBook 455 G5

  * [Bionic] bug fixes to improve stability of the ThunderX2 i2c driver
    (LP: #1781476)
    - i2c: xlp9xx: Fix issue seen when updating receive length
    - i2c: xlp9xx: Make sure the transfer size is not more than
      I2C_SMBUS_BLOCK_SIZE

  * x86/kvm: fix LAPIC timer drift when guest uses periodic mode (LP: #1778486)
    - x86/kvm: fix LAPIC timer drift when guest uses periodic mode

  * Please include ax88179_178a and r8152 modules in d-i udeb (LP: #1771823)
    - [Config:] d-i: Add ax88179_178a and r8152 to nic-modules

  * Nvidia fails after switching its mode (LP: #1778658)
    - PCI: Restore config space on runtime resume despite being unbound

  * Kernel error "task zfs:pid blocked for more than 120 seconds" (LP: #1781364)
    - SAUCE: (noup) zfs to 0.7.5-1ubuntu16.3

  * CVE-2018-12232
    - PATCH 1/1] socket: close race condition between sock_close() and
      sockfs_setattr()

  * CVE-2018-10323
    - xfs: set format back to extents if xfs_bmap_extents_to_btree

  * change front mic location for more lenovo m7/8/9xx machines (LP: #1781316)
    - ALSA: hda/realtek - Fix the problem of two front mics on more machines
    - ALSA: hda/realtek - two more lenovo models need fixup of MIC_LOCATION

  * Cephfs + fscache: unab...