SRU pull request sent to the kernel-team mailing list:
https://lists.ubuntu.com/archives/kernel-team/2019-August/102784.html
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Title:
** Also affects: linux (Ubuntu Eoan)
Importance: High
Assignee: Andrea Righi (arighi)
Status: Confirmed
** Also affects: linux (Ubuntu Disco)
Importance: Undecided
Status: New
** Changed in: linux (Ubuntu Disco)
Assignee: (unassigned) => Andrea Righi (ari
** No longer affects: linux (Ubuntu Cosmic)
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Title:
bcache: bch_allocator_thread(): hung task timeout
Status in linux package in Ub
** Changed in: linux (Ubuntu Disco)
Status: New => Confirmed
** Changed in: linux (Ubuntu Disco)
Importance: Undecided => High
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signed) => Andrea Righi (arighi)
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Title:
bcache: bch_allocator_thread(): hung task timeout
Status in linux package in Ubuntu:
Confirmed
eam (canonical-kernel-team) => Andrea Righi
(arighi)
** Changed in: kernel-sru-workflow/prepare-package-meta
Status: New => In Progress
** Changed in: kernel-sru-workflow/prepare-package-meta
Assignee: Canonical Kernel Team (canonical-kernel-team) => Andrea Righi
(arighi)
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** Description changed:
Additional AWS-specific and mainline patches are required to support
hibernation across the various types of AWS instances.
The following patch sets for linux-aws-xenial and linux-aws-bionic
provide the necessary functionality, and should only impact the
hibern
Weird that kprobe-perf isn't working... I've just tried it on a fresh
new installed 20.04 instance and:
ubuntu@ubuntu:~$ uname -a
Linux ubuntu 5.4.0-12-generic #15-Ubuntu SMP Tue Jan 21 15:12:29 UTC 2020
x86_64 x86_64 x86_64 GNU/Linux
ubuntu@ubuntu:~$ sudo ls -l /sys/kernel/debug/tracing/availabl
I also built a 5.4 based test kernel (with the extra drm/i915 patches
from https://cgit.freedesktop.org/~ickle/linux-2.6/log/?h=bug112315):
https://kernel.ubuntu.com/~arighi/LP-1853044/
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Ah! You're right, that's the reason! When the kernel is locked down
ftrace is explicitly disabled. To confirm that, you should have 0 in
/proc/sys/kernel/ftrace_enabled.
Can you try to set it back to 1 and see if kprobe-perf works after that?
Otherwise I'll figure out an alternative way to trace d
TL;DR @seth-arnold, as a test can you try to set the following options?
$ echo $((32 * 1024 * 1024)) | sudo tee /proc/sys/vm/dirty_bytes
$ echo $((32 * 1024 * 1024)) | sudo tee /proc/sys/vm/dirty_background_bytes
Repeat the test and see if the system is still unresponsive.
Details below.
Th
x27;s
only affecting the selftests, not the kernel, so regression potential is
minimal.
** Affects: linux (Ubuntu)
Importance: Medium
Assignee: Andrea Righi (arighi)
Status: New
** Affects: linux (Ubuntu Eoan)
Importance: Medium
Assignee: Andrea Righi (arighi)
S
u Eoan)
** No longer affects: linux-signed-hwe (Ubuntu Focal)
** Changed in: linux (Ubuntu Eoan)
Importance: Undecided => Medium
** Changed in: linux (Ubuntu Focal)
Importance: Undecided => Medium
** Changed in: linux (Ubuntu Eoan)
Assignee: (unassigned) => Andrea Righi (arig
Hi Seth, sorry for my late response.
I did more tests this morning on my laptop tracing the callers of
__alloc_pages_nodemask() and I noticed that pretty much all the time it
is called by the i915 shrinker. So I tried to disable it and I have to
say that on my laptop (at least) the system is alway
I've uploaded another test kernel (5.4.0-24.28+lp1861359v2):
https://kernel.ubuntu.com/~arighi/LP-1861359/
In this one, instead of completely disabling the i915 shrinker, I'm only
preventing to swap out the i915 caches when the system is short on
memory.
I'm testing this new one on my laptop righ
Seth, thanks for the update!
JFYI, I've just upladed also a v3 kernel (5.4.0-24.28+lp1861359v3) that
I'm currently testing on my laptop with positive result. This change is
even smaller than the previous one (v2), because we simply disable the
direct swap out in the i915 shrinker (I915_SHRINK_WRIT
@phausman sorry for the late response, is this bug still happening?
Unfortunately I don't see any error or potential problem in the attached
kernel.log or syslog. I guess the only way to debug this issue is to
reproduce the problem and run some commands via ssh...
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@phausman thanks for the update! To be more specific, it would be
interesting to take a look at dmesg while the problem is happening (I
would expect to see a kernel oops: hung task timeout). It would be also
interesting to take a look at the parent of these zombie tasks and try
to figure out if it'
The error "access beyond end of device" could mean that the USB boot
device wasn't created properly or the live system isn't detecting the
size of the USB device properly.
Have you tried to put another ISO on the same USB stick? Does this
problem happen only with the focal ISO?
Have you tried to
** Description changed:
[Impact]
- High watermark boosting can cause large swap activity under certain
- memory intensive workloads, making the system very unresponsive (screen
- does not refresh, keyboard not responding, etc.).
-
- This large swap activity seems to be prevented disabling hi
I've just tried to provision a new VM (via uvtools) using the latest
focal kernel (5.4.0-25-generic) and it seems to boot fine with 256MB of
memory. However, I haven't tried to do the release upgrade from 19.10
(I'll test this later).
If you have a way to boot into the previous kernel you can try
According to comment #106 it looks like the bug is still happening also
in 5.3.0-52-generic, so maybe we have just reduced the probability to
hit the bug.
Let's try a different approach.
Assuming that the bug wasn't happening in -45 and it started to happen
in -46, the bug is likely to be introdu
@pcworld @rhardy @benjamin-gemmill thank you very much for the feedback!
We will keep investigating about this bug.
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Title:
5.3.0-46
** Description changed:
+ [Impact]
+
+ High watermark boosting can cause large swap activity under certain
+ memory intensive workloads, making the system very unresponsive (screen
+ does not refresh, keyboard not responding, etc.).
+
+ This large swap activity seems to be prevented disabling hi
@mclemenceau do you have another pc / device that you can use to ssh
into your laptop when the screen is black? If you can do that it'd be
nice to see how a dmesg looks like when the screen is all black. Thanks!
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** Changed in: linux (Ubuntu)
Status: Confirmed => Fix Committed
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Title:
5.4.0-24.28 does not seem to apply rtprio, whereas -
This looks similar to LP: #1861395
I've prepared a test kernel (5.3.0-48.41+lp1861395v1), backporting the
following fixes that seems to have fixed the problem in 5.4:
b1339ecac661 drm/i915/execlists: Always force a context reload when rewinding
RING_TAIL
f26a9e959a7b drm/i915/gt: Detect if we
** Also affects: linux (Ubuntu Eoan)
Importance: Undecided
Status: New
** Changed in: linux (Ubuntu Eoan)
Status: New => Confirmed
** Changed in: linux (Ubuntu Eoan)
Importance: Undecided => Critical
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** Changed in: linux (Ubuntu Eoan)
Status: Invalid => Confirmed
** Changed in: linux (Ubuntu Eoan)
Importance: Undecided => Critical
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@sanette-linux thanks for testing! Can you provide some details about
the demo that seems to be slower? Do you notice the same slowness also
with a simple glxgears for example?
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** No longer affects: linux (Ubuntu Eoan)
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Title:
system hang: i915 Resetting rcs0 for hang on rcs0
Status in Linux:
Fix Released
@hbogert I've uploaded all the required deb's, it should be easier to
install the test kernel now:
https://kernel.ubuntu.com/~arighi/LP-1861395/5.3/
Thanks!
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cts: linux-aws (Ubuntu)
Importance: Undecided
Status: New
** Affects: linux-aws (Ubuntu Focal)
Importance: High
Assignee: Andrea Righi (arighi)
Status: New
** Also affects: linux (Ubuntu Focal)
Importance: Undecided
Status: New
** Package changed: lin
** Description changed:
[Impact]
The option CONFIG_DMA_CMA seems to cause resume problems on the t2.*
instance types (Xen).
- With this option enabled device drivers are allowed to use the Contiguous
Memory Allocator (CMA) for DMA operations. So, drivers can allocate large
physically
ee: Andrea Righi (arighi)
Status: Confirmed
** Affects: linux (Ubuntu Focal)
Importance: Medium
Assignee: Andrea Righi (arighi)
Status: Confirmed
** Package changed: linux-oem-5.6 (Ubuntu) => linux (Ubuntu)
** Changed in: linux (Ubuntu)
Assignee: (unassigned) =&
** Also affects: linux (Ubuntu Groovy)
Importance: Medium
Assignee: Andrea Righi (arighi)
Status: Confirmed
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Title
Xen.
** Affects: linux-aws (Ubuntu)
Importance: High
Assignee: Andrea Righi (arighi)
Status: New
** Affects: linux-aws (Ubuntu Eoan)
Importance: High
Assignee: Andrea Righi (arighi)
Status: New
** Affects: linux-aws (Ubuntu Focal)
Importance: High
** Summary changed:
- linux-aws: fix Xen / hibernation issues
+ linux-aws: Xen / hibernation: xen-netfront panic + resume hangs
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** Changed in: linux-aws (Ubuntu Eoan)
Status: New => Confirmed
** Changed in: linux-aws (Ubuntu Focal)
Status: New => Confirmed
** Changed in: linux-aws (Ubuntu)
Status: New => Confirmed
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** Changed in: linux-aws (Ubuntu Eoan)
Assignee: (unassigned) => Andrea Righi (arighi)
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https://bugs.launchpad.net/bugs/1879711
Title:
aws: disable CONFIG_DMA_
Hi Ryan, these boot delays are happening with a particular instance type
or a particular configuration? Is this slowness consistent across
reboots (rebooting the same instance multiple times)?
I'm doing some tests (profiling kernel initcalls and user-space boot
time via systemd-analize) using an i
I'm trying to reproduce this issue, but scrub always completes in a
reasonable amount of time in my case and `zpool status` seems to report
the correct statistics. I've tried with different pool sizes (all
smaller than 256GB). Are you using any special configuration for the
zpool?
I was wondering
I guess we can't use ftrace and secure boot at the same time then...
would it be possible to disable secure boot / kernel lockdown on your
side and run a test using that kprobe-perf command?
If it's not possible or too complicated we'll find an alternative way,
maybe I can create a custom kernel a
I've uploaded a test kernel here:
https://kernel.ubuntu.com/~arighi/LP-1853044/
It's basically 5.4.0-15-generic with the following upstream patches on
top:
8ee36e048c98 drm/i915/execlists: Minimalistic timeslicing
b1339ecac661 drm/i915/execlists: Always force a context reload when rewinding
RI
Hello, can you provide more details about your hardware? Is this a
laptop? What model?
Can you easily reproduce the bug? Did you notice if the problem started
to happen with a specific kernel (e.g., after a kernel update)?
Thanks!
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eam) => Andrea Righi
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** Changed in: kernel-sru-workflow/prepare-package-meta
Status: New => In Progress
** Changed in: kernel-sru-workflow/prepare-package-meta
Assignee: Canonical Kernel Team (canonical-kernel-team) => Andrea Righi
(arighi)
** Changed in: kernel-
There was an off by one error in the patch backported to 5.4.0-16.19 (same with
my the test kernel). For those who wants to test it, please try the latest
kernel from the unstable ppa (5.4.0-17.21):
https://launchpad.net/~canonical-kernel-team/+archive/ubuntu/unstable/+packages
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Many thanks for the reproducer Seth! I've been able to reproduce the
swapping issue on my laptop! Now I can investigate more on my side. I'll
keep you posted!
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Seth, can you try to see if you can reproduce the problem with the
latest unstable kernel (5.4.0-17.21)? https://launchpad.net/~canonical-
kernel-team/+archive/ubuntu/unstable
I can't reproduce the problem with it. I have not verified yet, but I
suspect it might be related to this commit:
d92ff
Hi Chris, thanks for reporting this. Did you start to notice this
problem after a kernel update or just when you started using the Eclipse
IDE? I'm wondering if this was a regression introduced by a specific
kernel update...
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*** This bug is a duplicate of bug 1863261 ***
https://bugs.launchpad.net/bugs/1863261
** This bug has been marked a duplicate of bug 1863261
modinfo prints an error message if modules.builtin.bin is missing
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Hi Levi, thanks for reporting this. Can you reproduce this problem
easily (how often does it happen)? Did it start to happen after a
specific kernel update?
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If you can still ssh to the system when the problem happens, can you run
dmesg and post the output here? Thanks!
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Title:
Ubuntu Bion
Looking at the kernel version (4.15.18+) it seems like you are running a
custom kernel. Does this problem happen also with the stock Ubuntu
kernel? Thanks.
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The depmod error messages have been fixed in initramfs-tools (see
https://bugs.launchpad.net/bugs/1863261). It doesn't actually prevent
the kernel from booting, so you can safely reboot.
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@rbalint if you can reproduce the problem easily, it would be
interesting to monitor the received ACPI events via acpi_listen.
What I see during my tests is that acpi_listen is always showing the
sleep events, meaning that the kernel receives them correctly at least,
and then the failure happens i
@rbalint unfortunately bisecting the kernel is not a trivial task...
there are many changes between the stock 4.15 and the 5.0 kernels and
the process is probably going to take a long time. I'll check if it's
possible to identify only a subset of potential commits that might have
caused this proble
@seth-arnold ok I'll do this tests also on my side and see if I can
reproduce the problem. If you find a specific web page that can trigger
the problem easily let me know. Thanks!
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** Also affects: linux (Ubuntu Focal)
Importance: Undecided
Status: Incomplete
** Changed in: linux (Ubuntu Focal)
Assignee: (unassigned) => Andrea Righi (arighi)
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Patch posted to the kernel-team list. Thanks for reporting it!
https://lists.ubuntu.com/archives/kernel-team/2020-March/108017.html
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https://bugs.launchpad.net/bugs/1865332
@cbrauner just to make sure, you are talking about this patchset
correct?
https://lore.kernel.org/linux-
pm/20200217165854.4ywtbxbaenha3iti@wittgenstein/T/
** Also affects: linux (Ubuntu Focal)
Importance: Undecided
Status: Confirmed
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@oded-geek sorry, there was an off by one bug in my custom kernel (I've
removed it just to make sure nobody is doing other tests with it), could
you try the latest kernel from the unstable ppa (5.4.0-17.21)?
https://launchpad.net/~canonical-kernel-
team/+archive/ubuntu/unstable/+packages
Thanks!
Thanks for reporting this.
The CurrentDmesg.txt that you posted doesn't seem to include the part
when you close the lid, am I correct?
In that case could you run `dmesg -w` on a console session, close the
lid and post what you get in dmesg?
Another interesting test could be to check if the ACPI
Hi Colton, thanks for testing it! It looks like the kernel correctly
receives and delivers the ACPI events, but then it fails to perform the
actual suspend to mem.
Can you try one more test?
echo 1 > /sys/power/pm_debug_messages
echo 0 > /sys/power/pm_async
echo mem > /sys/power/state
The fir
eam (canonical-kernel-team) => Andrea Righi
(arighi)
** Changed in: kernel-sru-workflow/prepare-package-meta
Status: New => In Progress
** Changed in: kernel-sru-workflow/prepare-package-meta
Assignee: Canonical Kernel Team (canonical-kernel-team) => Andrea Righi
(arighi)
*
** Tags removed: verification-needed-bionic
** Tags added: verification-done-bionic
** Tags removed: verification-needed-disco
** Tags added: verification-done-disco
** Tags removed: verification-needed-eoan verification-needed-xenial
** Tags added: verification-done-eoan verification-done-xenial
Public bug reported:
[Impact]
A caching bug in the hibernation code can lead to potential memory
corruptions on resume.
The hibernation code is representing all the allocated pages in memory
(pfn) using a list of extents, inside each extent it uses a radix tree
and each node in the tree contains
cal-kernel-team) => Andrea Righi
(arighi)
** Changed in: kernel-sru-workflow/prepare-package-meta
Status: New => In Progress
** Changed in: kernel-sru-workflow/prepare-package-meta
Assignee: Canonical Kernel Team (canonical-kernel-team) => Andrea Righi
(arighi)
--
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eam (canonical-kernel-team) => Andrea Righi
(arighi)
** Changed in: kernel-sru-workflow/prepare-package-meta
Status: New => In Progress
** Changed in: kernel-sru-workflow/prepare-package-meta
Assignee: Canonical Kernel Team (canonical-kernel-team) => Andrea Righi
(arighi)
*
-sru-workflow/prepare-package
Importance: Medium
Assignee: Andrea Righi (arighi)
Status: In Progress
** Affects: kernel-sru-workflow/prepare-package-meta
Importance: Medium
Assignee: Andrea Righi (arighi)
Status: In Progress
** Affects: kernel-sru-workflow
nel Team (canonical-kernel-team) => Andrea Righi
(arighi)
** Changed in: kernel-sru-workflow/prepare-package-lrm
Status: New => In Progress
** Changed in: kernel-sru-workflow/prepare-package-lrm
Assignee: Canonical Kernel Team (canonical-kernel-team) => Andrea Righi
(arighi)
** Changed in: linux (Ubuntu)
Assignee: Colin Ian King (colin-king) => Andrea Righi (arighi)
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Title:
swap storms ki
Hello Seth, thanks for reporting the problem. I was wondering if this
could be related to the memory cgroup controller.
As a simple test could you try to reboot the system adding
cgroup_disable=memory to the kernel boot parameters?
In this way if the problem goes away at least we know it's relate
OK, so we know that it's not related to the memory cgroup subsystem.
Another reason of such unexpected swapping activity could be due to
memory compaction code that is triggering some direct memory reclaim and
forcing to swap out pages.
What do you have in /proc/sys/vm/swappiness? Could you try t
eam (canonical-kernel-team) => Andrea Righi
(arighi)
** Changed in: kernel-sru-workflow/prepare-package-meta
Status: New => In Progress
** Changed in: kernel-sru-workflow/prepare-package-meta
Assignee: Canonical Kernel Team (canonical-kernel-team) => Andrea Righi
(arighi)
*
eam (canonical-kernel-team) => Andrea Righi
(arighi)
** Changed in: kernel-sru-workflow/prepare-package-lrm
Status: New => In Progress
** Changed in: kernel-sru-workflow/prepare-package-lrm
Assignee: Canonical Kernel Team (canonical-kernel-team) => Andrea Righi
(arighi)
** Change
poff phase.
** Affects: linux-aws (Ubuntu)
Importance: Undecided
Assignee: Andrea Righi (arighi)
Status: New
** Affects: linux-aws (Ubuntu Bionic)
Importance: Undecided
Assignee: Andrea Righi (arighi)
Status: New
** Also affects: linux-aws (Ubuntu Bionic)
** Also affects: linux-aws (Ubuntu Disco)
Importance: Undecided
Status: New
** Changed in: linux-aws (Ubuntu Disco)
Importance: Undecided => High
** Changed in: linux-aws (Ubuntu Disco)
Assignee: (unassigned) => Andrea Righi (arighi)
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** Also affects: linux-aws (Ubuntu Disco)
Importance: Undecided
Status: New
** Changed in: linux-aws (Ubuntu Disco)
Importance: Undecided => High
** Changed in: linux-aws (Ubuntu Disco)
Assignee: (unassigned) => Andrea Righi (arighi)
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** Changed in: linux (Ubuntu)
Assignee: (unassigned) => Andrea Righi (arighi)
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Title:
5.4.0-11 crash on cryptsetup o
After a first look at the kernel bug trace, it seems that
q->make_request_fn(q, bio) (block/blk-core.c:1064) became NULL.
The reason might be a race with a block device not yet properly
initialized when some I/O requests were submitted (or a block device de-
registered too early while some I/O was
** Summary changed:
- focal/linux-5.4: 5.4.0-11.14 -proposed tracker
+ focal/linux-5.4: 5.4.0-12.15 -proposed tracker
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Title:
focal
commit c50532b9d7b623ff98aeaf0b848e58adae54ca75 (HEAD -> master, tag:
Ubuntu-4.15.0-48.51, origin/master, origin/HEAD)
Author: Andrea Righi
Date: Tue Apr 2 18:31:55 2019 +0200
UBUNTU: Ubuntu-4.15.0-48.51
Signed-off-by: Andrea Righi
1. Build a kernel image with 'zfs_enable'
*** This bug is a duplicate of bug 1830433 ***
https://bugs.launchpad.net/bugs/1830433
I think this one is a duplicate of #1830433 (and the fix has been
already applied to bionic).
** This bug has been marked a duplicate of bug 1830433
32-bit x86 kernel 4.15.0-50 crash in vmalloc_sync_all
** Also affects: linux (Ubuntu Bionic)
Importance: Undecided
Status: New
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https://bugs.launchpad.net/bugs/1827884
Title:
Boot problems after upgrade to kernel 4.1
This might be a duplicate of 1830433, could you give it a try with this
test kernel and see if the problem is still happening?
https://kernel.ubuntu.com/~arighi/LP-1827884/
Thanks!
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So, it looks like bug 1830433 didn't fix this problem... assuming it's
still an x86/mm issue, it'd be interesting to test another kernel (I've
applied a few more x86/mm-related fixes).
This new test kernel is available at the same place:
https://kernel.ubuntu.com/~arighi/LP-1827884/
As correctly
>From a kernel perspective this big slowness on shutting down a bcache
volume might be caused by a locking / race condition issue. If I read
correctly this problem has been reproduced in bionic (and in xenial we
even got a kernel oops - it looks like caused by a NULL pointer
dereference). I would t
** Changed in: curtin
Assignee: Terry Rudd (terrykrudd) => Andrea Righi (arighi)
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Title:
Tight timeout for bcache remo
Thanks for the tests and the feedback @dima2017 and @valia0906! Could
you also post the output of the following commands?
$ uname -r
$ cat /proc/cmdline
$ cat /sys/devices/system/cpu/vulnerabilities/meltdown
** Also affects: linux (Ubuntu Xenial)
Importance: Undecided
Status: New
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(arighi)
** Changed in: kernel-sru-workflow/prepare-package-meta
Status: New => In Progress
** Changed in: kernel-sru-workflow/prepare-package-meta
Assignee: Canonical Kernel Team (canonical-kernel-team) => Andrea Righi
(arighi)
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You recei
It would be interesting to try this fix:
https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=37f9579f4c31a6d698dbf3016d7bf132f9288d30
I've uploaded a test kernel (based on 4.15.0-54 + the fix mentioned above):
https://kernel.ubuntu.com/~arighi/LP-1835279/
Claudio, it wou
Thanks tons for the tests Ryan! Well, at least the hung task timeout
trace is different, so we're making some progress.
With the new kernel it seems that we're stuck in bch_bucket_alloc().
I've identified other upstream fixes that could help to prevent this
problem.
If you're willing to do few mo
Michael, first of all thanks for testing. It seems that (in your case at
least) the problem was fixed by the extra commits that I backported into
4.15.0-54, so I think it's worth to have them applied.
To answer your questions, 1) you may want to install also linux-
modules-4.15.0-54-generic_4.15.0
** Changed in: linux (Ubuntu Bionic)
Assignee: (unassigned) => Andrea Righi (arighi)
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https://bugs.launchpad.net/bugs/1827884
Title:
Boot problems after upgrade
** Description changed:
+ [Impact]
+
+ Commit d653420532d580156c8486686899ea6a9eeb7bf0 in bionic enabled kernel
+ page table isolation for x86_32, but also introduced regressions. One of
+ them ("BUG_ON() condition in vmalloc_sync_one()") has been addressed by
+ bug 1830433, but there are other i
Possibly a duplicate of bug 1796292, since we've got the same hung task
timeout trace in bch_bucket_alloc() with the latest test kernel
(4.15.0-55-generic #60+lp796292).
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http
Good news! I've been able to reproduce the hung task in
bch_bucket_alloc() issue locally, using the test case from bug 1784665.
I think we're hitting the same problem now. I'll do more tests and will
keep you updated.
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*** This bug is a duplicate of bug 1796292 ***
https://bugs.launchpad.net/bugs/1796292
** This bug has been marked a duplicate of bug 1796292
Tight timeout for bcache removal causes spurious failures
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eam (canonical-kernel-team) => Andrea Righi
(arighi)
** Changed in: kernel-sru-workflow/prepare-package-meta
Status: New => In Progress
** Changed in: kernel-sru-workflow/prepare-package-meta
Assignee: Canonical Kernel Team (canonical-kernel-team) => Andrea Righi
(arighi)
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You r
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