[Bug 1749040] Re: KPTI support for arm64 systems

[dann frazier]

** Changed in: linux (Ubuntu Artful)
   Status: In Progress => Fix Released

** Changed in: linux (Ubuntu Bionic)
   Status: Incomplete => Fix Committed

** Changed in: linux (Ubuntu Bionic)
   Status: Fix Committed => Fix Released

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Title:
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[Bug 1749040] Re: KPTI support for arm64 systems

[dann frazier]

I've reproduced the CRB1S panic with the current (non-kpti) kernel and
without crypt lvm (standard MAAS install) and reported bug 1754053 to
track it. We can rule that out as being caused by kpti.

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[Bug 1749040] Re: KPTI support for arm64 systems

[dann frazier]

I rebooted the machine (lundmark) and restarted the test mentioned in
the previous comment, this time the system crashed w/ a Synchronous
External Abort:

[23243.094384] Synchronous External Abort: synchronous parity or ECC
error (0x8618) at 0xb0f74f68

This suggests a non-software issue. I'll seek another CRB machine and
retest.

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[Bug 1749040] Re: KPTI support for arm64 systems

[dann frazier]

** Attachment added: "combined kern.log/serial log of lundmark SEA crash"
   
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1749040/+attachment/5071412/+files/lundmark-cert-failure-sea.log

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Re: [Bug 1749040] Re: KPTI support for arm64 systems

[dann frazier]

On Mon, Mar 5, 2018 at 9:06 AM, dann frazier  wrote:
> On Mon, Mar 5, 2018 at 7:47 AM, Paolo Pisati <1749...@bugs.launchpad.net> 
> wrote:
>> Good, any other pending tests?
>
> Yes, just one more. I'm going to run the same test on the kpti kernel
> on a different system of the same config, but *without* lvm crypt.
> Starting that now.

Unfortunately, that locked up. Not in the disk test, but while running:
stress-ng -k --aggressive --verify --timeout 1560 --brk 0
(I kicked off a full cert re-run)

Those stress-ng process are stuck blocked for I/O, and commands like
'ps -ef' hang.
The system is otherwise idle.


** Attachment added: "kern.log"
   https://bugs.launchpad.net/bugs/1749040/+attachment/5070520/+files/kern.log

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Re: [Bug 1749040] Re: KPTI support for arm64 systems

[dann frazier]

On Mon, Mar 5, 2018 at 7:47 AM, Paolo Pisati <1749...@bugs.launchpad.net> wrote:
> Good, any other pending tests?

Yes, just one more. I'm going to run the same test on the kpti kernel
on a different system of the same config, but *without* lvm crypt.
Starting that now.

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[Bug 1749040] Re: KPTI support for arm64 systems

[Paolo Pisati]

Good, any other pending tests?

If not, i'll move forward and send a the above v2 arm64 kpti patchset.

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[Bug 1749040] Re: KPTI support for arm64 systems

[dann frazier]

I was able to reproduce a crash on a crypted LVM system w/ the pre-KPTI
kernel. LP: #1753489.

The backtrace isn't identical, but it does show that crypted LVM was
fragile even before the KPTI patches.

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Re: [Bug 1749040] Re: KPTI support for arm64 systems

[dann frazier]

On Mon, Mar 5, 2018 at 2:34 AM, Paolo Pisati <1749...@bugs.launchpad.net> wrote:
> Is there a way for me to manually run disk/disk_stress_ng_dm-1?

I've just started a run on the server/config that failed the test, but
with a pre-kpti kernel, to see if it follows kpti or the
system/config. The command it generated was:

timeout -s 14 1200 stress-ng --aggressive --verify --timeout 240
--temp-path /tmp/disk_stress_ng_7a89ec14-42ad-4a5c-ae7d-41b3293cd7ee
--aio 0 --hdd-opts dsync --readahead-bytes 16M -k

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[Bug 1749040] Re: KPTI support for arm64 systems

[Paolo Pisati]

Is there a way for me to manually run disk/disk_stress_ng_dm-1?

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[Bug 1749040] Re: KPTI support for arm64 systems

[dann frazier]

All failures expected.

** Attachment added: "Gigabyte R120 (ACPI mode ThunderX) results"
   
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1749040/+attachment/5067656/+files/r120.html

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[Bug 1749040] Re: KPTI support for arm64 systems

[dann frazier]

crb1s results - all expected failures except disk/disk_stress_ng_dm-1
which is what was running when the panic mentioned in comment #39
occurred.

** Attachment added: "results from thunderx crb1s"
   
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1749040/+attachment/5067655/+files/crb1s.html

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Re: [Bug 1749040] Re: KPTI support for arm64 systems

[dann frazier]

On Fri, Mar 2, 2018 at 4:48 AM, Paolo Pisati <1749...@bugs.launchpad.net> wrote:
> If the bug in #39 is not related to kpti, can you spawn it into a
> separate LP bug and add a reproducer?

If it is shown to not be related to KPTI after I run those further
tests, that is the plan.

  -dann

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[Bug 1749040] Re: KPTI support for arm64 systems

[Paolo Pisati]

If the bug in #39 is not related to kpti, can you spawn it into a
separate LP bug and add a reproducer?

Thanks.

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[Bug 1749040] Re: KPTI support for arm64 systems

[Manoj Iyer]

Merlin system cert results.

** Attachment added: "results of cert on merlin"
   
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1749040/+attachment/5066621/+files/submission_2018-03-02T03.59.13.971794.html

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[Bug 1749040] Re: KPTI support for arm64 systems

[dann frazier]

I've seen a couple crashes on a ThunderX CRB1S system - though at this
point I don't have reason to believe it is related to KPTI. This system
happened to be installed with LVM + crypted home, and we haven't ran the
cert tests on such a config before. After the remaining tests complete,
I plan to re-run with the pre-kpti kernel on this config, as well as
running cert on the "usual" config w/ a kpti kernel. I was only able to
capture the console of one of the crashes, I'll attach it here.

I also have a cert run still in-progress from a Gigabyte R120. This
system is very similar to the CRB1S, and has not seen any problems yet.

** Attachment added: "thunderx panic console log"
   
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1749040/+attachment/5066573/+files/console.log

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[Bug 1749040] Re: KPTI support for arm64 systems

[dann frazier]

** Attachment added: "sabre test results - all errors expected"
   
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1749040/+attachment/5066572/+files/submission_2018-03-01T15.11.01.312793.html

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[Bug 1749040] Re: KPTI support for arm64 systems

[dann frazier]

D05 & QDF2400 errors are all expected, thanks Manoj!

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Re: [Bug 1749040] Re: KPTI support for arm64 systems

[dann frazier]

On Thu, Mar 1, 2018 at 8:50 AM, Paolo Pisati <1749...@bugs.launchpad.net> wrote:
> I see 5 failures marked as blocker there: 4 couldn't complete due to the
> test environment, and 1[*], apparently, is a CONFIG issue (so something
> that predates this patchset).

Sorry - I didn't have time to analyze it last night when I posted. All
5 are expected:
  - disk/disk_stress_ng_sda is a test bug (LP: #1751167)
  - ethernet/multi_iperf3_* requires a client/server setup we don't
have in place
  - miscellanea/bmc_info - this system doesn't have a conventional BMC
  - miscellanea/efi_boot_mode - this system boots w/ u-boot
  - miscellanea/ipmi_test - this system doesn't have a conventional BMC

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[Bug 1749040] Re: KPTI support for arm64 systems

[Manoj Iyer]

cert testing on QDF2400

** Attachment added: "cert testing on QDF2400"
   
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1749040/+attachment/5066200/+files/submission_2018-03-01T15.40.44.388832.html

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[Bug 1749040] Re: KPTI support for arm64 systems

[Manoj Iyer]

Hisilicon D05-0 testing.

** Attachment added: "cert testing on Hisilicon"
   
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1749040/+attachment/5066199/+files/submission_2018-03-01T15.37.19.324054.html

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[Bug 1749040] Re: KPTI support for arm64 systems

[Paolo Pisati]

I see 5 failures marked as blocker there: 4 couldn't complete due to the
test environment, and 1[*], apparently, is a CONFIG issue (so something
that predates this patchset).

Let's see what the other boards report.

1:
https://launchpadlibrarian.net/359043692/submission_2018-03-01T05.58.16.640032.html#7-10-log

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[Bug 1749040] Re: KPTI support for arm64 systems

[dann frazier]

Refreshed kernel now in ppa:dannf/kpti

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[Bug 1749040] Re: KPTI support for arm64 systems

[dann frazier]

** Attachment added: "Updated test results from an HP m400 (X-Gene) system"
   
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1749040/+attachment/5065762/+files/submission_2018-03-01T05.58.16.640032.html

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Re: [Bug 1749040] Re: KPTI support for arm64 systems

[dann frazier]

On Wed, Feb 28, 2018 at 10:12 AM, Paolo Pisati
<1749...@bugs.launchpad.net> wrote:
> Found && fixed.
>
> https://git.launchpad.net/~p-pisati/ubuntu/+source/linux/log/?h=artful-
> master-next-arm64-kpti-414-backport
>
> I pushed two fixes on top of it:
>
> 1) 'syscalls: Use CHECK_DATA_CORRUPTION for addr_limit_user_check' fixes a 
> FTBFS for armhf
> 2) 'arm64: mm: fix thinko in non-global page table attribute check' fixes 
> this kvm boot race
>
> We probably need to test it again on all arm64 boards now...

OK - I'll get a PPA kernel built and we'll begin another test cycle.

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[Bug 1749040] Re: KPTI support for arm64 systems

[Paolo Pisati]

Found && fixed.

https://git.launchpad.net/~p-pisati/ubuntu/+source/linux/log/?h=artful-
master-next-arm64-kpti-414-backport

I pushed two fixes on top of it:

1) 'syscalls: Use CHECK_DATA_CORRUPTION for addr_limit_user_check' fixes a 
FTBFS for armhf
2) 'arm64: mm: fix thinko in non-global page table attribute check' fixes this 
kvm boot race

We probably need to test it again on all arm64 boards now...

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[Bug 1749040] Re: KPTI support for arm64 systems

[Paolo Pisati]

Yep, if it boots fine, i usually retry 2/3 times, and it has happened
that it failed only the second or the third time i tried.

Anyhow, now i'm down to this delta .config (the initial one had ~2k
entries), so the bug appears to be ACPI related:

---
CONFIG_ACPI=y
CONFIG_ACPI_APEI=y
CONFIG_ACPI_APEI_GHES=y
CONFIG_ACPI_APEI_MEMORY_FAILURE=y
CONFIG_ACPI_APEI_PCIEAER=y
CONFIG_ACPI_APEI_SEA=y
CONFIG_ACPI_BGRT=y
CONFIG_ACPI_BUTTON=y
CONFIG_ACPI_CCA_REQUIRED=y
CONFIG_ACPI_CONTAINER=y
CONFIG_ACPI_CPPC_LIB=y
CONFIG_ACPI_DOCK=y
CONFIG_ACPI_FAN=y
CONFIG_ACPI_GENERIC_GSI=y
CONFIG_ACPI_GTDT=y
CONFIG_ACPI_HED=y
CONFIG_ACPI_HOTPLUG_CPU=y
CONFIG_ACPI_I2C_OPREGION=y
CONFIG_ACPI_IORT=y
CONFIG_ACPI_MCFG=y
CONFIG_ACPI_NUMA=y
CONFIG_ACPI_PCI_SLOT=y
---

How to reproduce it from d05-6 - 192.168.122.14 is my kvm instance:

$ make defconfig
$ cat $abovedelta >> .config
$ make olddefconfig
$ make -j65
$ scp arch/arm64/boot/Image ubuntu@192.168.122.14:.
$ ssh ubuntu@192.168.122.14

and inside the kvm instance:

$ sudo cp Image /boot/
and when rebooting, presc Esc at the grub menu, select the "Image" entry 
previously created[*]

*: in /boot/grub/grub.cfg create a copy of the default Ubuntu instance,
but use /boot/Image instead of /boot/vmlinuz-x.y.z, remove "quiet
splash" from the default argument and rename it 'Image'

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[Bug 1749040] Re: KPTI support for arm64 systems

[dann frazier]

Right - I should've mentioned that - the issue follows the guest kernel
for me as well. I tested w/ latest upstream for both just in case the
guest failure is a somehow a side-effect of a host kernel bug.

Also, I should have mentioned that this is an intermittent failure for
me. I sometimes have to reboot the guest several times to observe the
failure. The test also seems sensitive to changes in the test setup -
for example, bumping up the guest cpu count to ~50 made the issue go
into hiding.

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[Bug 1749040] Re: KPTI support for arm64 systems

[Paolo Pisati]

No need to install 4.16-rc3 in both host & guest: i can reproduce it
on d05-6 using 4.13.0-36-generic #40~16.04.1 on host (no KPTI
patchset) and 4.16.0-rc3+ on guest.

Unfortunately defconfig boots fine, so there's something in that .config that 
trips it.
If trying to reproduce it, remove the CONFIG_DEBUG_INFO, to avoid building kmod 
with debug info and ending up with +1Gb of kmods.

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[Bug 1749040] Re: KPTI support for arm64 systems

[dann frazier]

** Summary changed:

- KPTI-enabled kernel fails to boot on Cavium ThunderX CRB
+ KPTI support for arm64 systems

** Attachment added: "config used to build 4.16-rc3 kernel"
   
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1749040/+attachment/5064177/+files/.config

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https://bugs.launchpad.net/bugs/1749040

Title:
  KPTI support for arm64 systems

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