signed) => Andrea Righi (arighi)
** Changed in: linux (Ubuntu)
Importance: Medium => High
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Title:
kernel crash : net_sched race
** Changed in: linux (Ubuntu)
Importance: Undecided => Medium
** Also affects: linux (Ubuntu Bionic)
Importance: Undecided
Status: New
** Changed in: linux (Ubuntu Bionic)
Status: New => Confirmed
** Changed in: linux (Ubuntu Bionic)
Importance: Undecided => Medium
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This module in attach (similar to the one posted by @mjeanson) has been
used as an effective reproducer for this bug. It looks like we need to
reboot the system a couple of times and load this module to immediately
trigger the bug.
** Attachment added: "vmalloc_sync_all() stress test"
https://
** Description changed:
+ [Impact]
+
+ Commit d653420532d580156c8486686899ea6a9eeb7bf0 in bionic enabled kernel
+ page table isolation for x86_32, but also introduced a kernel bug (the
+ BUG_ON() condition in vmalloc_sync_one()) that seems to happen when
+ vmalloc_sync_all() is called multiple ti
nel-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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** 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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** 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
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** Tags removed: verification-needed-bionic
** Tags added: verification-done-bionic
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Title:
bionic: netlink: potential shift overflo
Update: the patch to downgrade the error "Unable to open file..." to a
warning seems to be already applied to the bionic kernel
(https://git.launchpad.net/~ubuntu-
kernel/ubuntu/+source/linux/+git/bionic/commit/?h=master-
next&id=58441dc86d7b066a2c02079829a96035587a7066) and the cosmic kernel
(http
@manjo thanks for testing again! Now I see, we need to apply another
small patch to security/integrity/digsig.c, that seems to have exactly
the same error message that should be considered a warning instead. I'll
post a fix soon.
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** Description changed:
+ [Impact]
+
+ The integrity subsystem is still reporting error messages like this at
+ boot:
+
+ integrity: Unable to open file: /etc/keys/x509_evm.der (-2)
+
+ In a previous commit we have downgraded these errors to warnings:
+
+ https://git.launchpad.net/~ubuntu-
+
** Description changed:
[Impact]
The integrity subsystem is still reporting error messages like this at
boot:
- integrity: Unable to open file: /etc/keys/x509_evm.der (-2)
+ integrity: Unable to open file: /etc/keys/x509_evm.der (-2)
- In a previous commit we have downgraded the
And about the error "vio vio: uevent:" happening at boot, it could be
triggered by something in the initramfs. I think the best thing we can
do from a kernel perspective is to add extra information to the error
message to figure out exactly which task is triggering this error, and
maybe also print
nel-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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** Tags removed: verification-needed-cosmic
** Tags added: verification-done-cosmic
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Title:
systemd cause kernel trace "BUG: unable
nel-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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** 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)
*
Verification done using the test case reported in the description
(https://launchpadlibrarian.net/416589265/lp1262692)
** Tags removed: verification-needed-xenial
** Tags added: verification-done-xenial
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** Tags removed: verification-needed-xenial
** Tags added: verification-done-xenial
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Title:
Remove btrfs module after a failed fallo
Verification done in bionic using the test case reported in the
description (https://launchpadlibrarian.net/416589265/lp1262692)
** Tags removed: verification-needed-bionic
** Tags added: verification-done-bionic
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Can you try to set the following before suspend:
echo 0 > /sys/class/net/wlp4s0/device/d3cold_allowed
And then test a suspend/resume cycle.
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I've uploaded a new test kernel based on the latest bionic kernel from
master-next:
https://kernel.ubuntu.com/~arighi/LP-1796292/4.15.0-56.62~lp1796292/
In addition to that I've backported all the recent upstream bcache fixes
and applied my proposed fix for the potential deadlock in
bch_allocator
Thanks Ryan, this is very interesting:
[ 259.411486] bcache: register_bcache() error /dev/vdg: device already
registered (emitting change event)
[ 259.537070] bcache: register_bcache() error /dev/vdg: device already
registered (emitting change event)
[ 259.797830] bcache: register_bcache() error
I can confirm that the problem is present on the 7th Generation X1
Carbon as well.
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Title:
Touchpad and/or trackpoint stop working a
Ryan, unfortunately the last reproducer script is giving me a lot of
errors and I'm still trying to figure out how to make it run to the end
(or at least to a point where it's start to run some bcache commands).
In the meantime (as anticipated on IRC) I've uploaded a test kernel
reverting the patc
After some help from Ryan (on IRC) I've been able to run the last
reproducer script and trigger the same trace. Now I should be able to
collect all the information that I need and hopefully post a new test
kernel (fixed for real...) soon.
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I don't have the NFC chip.
With kernel 5.2.x, it happens always after hibernation, sometimes after
suspension, rarely after reboot. I'm occasionally able to restore it by
unloading/reloading the i2c_hid kernel module.
With kernel 4.19.61, the issue occurs sporadically, and I can always
solve it b
Some additional info about the deadlock:
crash> bt 16588
PID: 16588 TASK: 9ffd7f332b00 CPU: 1 COMMAND: "bcache_allocato"
[exception RIP: bch_crc64+57]
RIP: c093b2c9 RSP: ab9585767e28 RFLAGS: 0286
RAX: f1f51403756de2bd RBX: RCX: 0
** Description changed:
- $ cat /proc/version_signature
+ [Impact]
+
+ bcache_allocator() can call the following:
+
+ bch_allocator_thread()
+ -> bch_prio_write()
+ -> bch_bucket_alloc()
+ -> wait on &ca->set->bucket_wait
+
+ But the wake up event on bucket_wait is supp
Ryan, I've uploaded a new test kernel with the fix mentioned in the
comment before:
https://kernel.ubuntu.com/~arighi/LP-1796292/4.15.0-56.62~lp1796292+4/
I've performed over 100 installations using curtin-nvme.sh
(install_count = 100), no hung task timeout. I'll run other stress tests
to make su
*** This bug is a duplicate of bug 1784665 ***
https://bugs.launchpad.net/bugs/1784665
** This bug has been marked a duplicate of bug 1784665
bcache: bch_allocator_thread(): hung task timeout
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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
Hello,
same problem here!!!
which commands do you use to downgrade intel-microcode.
Thanks,
Andrea
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Title:
Cannot boot
** 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
d anything that includes linux/security.h and check for
warnings/errors.
[Fix]
Fix by removing the trailing semicolon.
[Regression potential]
The problem is an obvious syntax error, fix is trivial, so regression
potential is minimal.
** Affects: linux (Ubuntu)
Importance: Medium
Assign
** 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
(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)
** 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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