** Changed in: gcc-11 (Ubuntu Impish)
Status: New => Invalid
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Title:
jammy 5.15 kernel soft lockup when zfs.ko is loaded on s390x w/ gcc
Upadting the 'affects jammy' kernel entry as well.
Since commit 'f3b7e73b2c6619884351a3a0a7468642f852b8a2' is included in jammy's
5.15 since Ubuntu-5.15.0-20.20, I'm updating the status to Fix released and
with this the projects entry, too.
** Changed in: linux (Ubuntu Jammy)
Status: Fix
This bug was fixed in the package linux - 5.13.0-37.42
---
linux (5.13.0-37.42) impish; urgency=medium
* impish/linux: 5.13.0-37.42 -proposed tracker (LP: #1964959)
* CVE-2022-0742
- ipv6: fix skb drops in igmp6_event_query() and igmp6_event_report()
linux (5.13.0-36.41)
This bug is awaiting verification that the linux-
azure-5.13/5.13.0-1019.21~20.04.1 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-focal' to
'verification-done-focal'. If the problem
Many thanks Ilya!
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Title:
jammy 5.15 kernel soft lockup when zfs.ko is loaded on s390x w/ gcc >=
11.2.0-10ubuntu1 / gcc-11 PLT regression on
I've installed the impish kernel 5.13.0-32 on top of jammy; zfs module
loads fine:
$ uname -r
5.13.0-32-generic
$ modinfo zfs | grep filename:
filename: /lib/modules/5.13.0-32-generic/updates/dkms/zfs.ko
$ strings /lib/modules/5.13.0-32-generic/updates/dkms/zfs.ko|grep -e vermagic=
-e
This bug is awaiting verification that the linux/5.13.0-32.35 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-impish' to 'verification-done-impish'. If the
problem still exists,
** Changed in: linux (Ubuntu Impish)
Status: New => Fix Committed
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Title:
jammy 5.15 kernel soft lockup when zfs.ko is loaded on s390x w/
JFYI, I've sent an SRU email to apply the kernel fix also to Impish
5.13, just to be safe in case the gcc patch lands in Impish:
https://lists.ubuntu.com/archives/kernel-team/2022-February/127652.html
** Also affects: zfs-linux (Ubuntu Impish)
Importance: Undecided
Status: New
** Also
I would reapply the gcc patch. It should not affect most userspace
binaries - for example, it did not produce any changes whatsoever in
SPEC suite. Even if there are some binaries that are built with kernel-
like options and get extra relocations as a result, ld.so processes such
relocations
@fheimes @iii-i
thank you for this, we will include that patch into our kernels. Do you
expect that the toolchain change may have affected any other binaries
(ie. userspace binaries)? Or should we re-apply the reverted patch back
in our gcc-11 (given the improvements that it brings)?
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Juts had a quick chat with the kernel team,
and it's expected to have this incl. in jammy's 5.15.0-20.20 latest.
** Changed in: ubuntu-z-systems
Status: In Progress => Fix Committed
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Thx for the heads-up, Ilya!
** Changed in: ubuntu-z-systems
Status: Confirmed => In Progress
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Title:
jammy 5.15 kernel soft lockup when
The fix is now in v5.15 stable branch:
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/commit/?h=linux-5.15.y=2025d5cb381e4bf8fecc78015da6ef6168f9ace8
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Yes, the commit has cc:stable and fixes: tags, so it should be picked up
for v4.19 and later.
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Title:
jammy 5.15 kernel soft lockup when zfs.ko
Thanks you, Ilya.
Do you plan to tag this for any of the upstream stable release kernels (like
5.15)?
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Title:
jammy 5.15 kernel soft lockup
We pushed this fix into s390/for-next
(https://git.kernel.org/pub/scm/linux/kernel/git/s390/linux.git/commit/?h=for-
next=f3b7e73b2c6619884351a3a0a7468642f852b8a2).
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The attached patch resolved the issue on my test VM, could you please
give it a try?
** Patch added:
"0001-s390-module-fix-loading-modules-with-a-lot-of-reloca.patch"
A quick update: zfs.ko gets quite a lot of relocations with the gcc
patch, and the total size of PLT entries generated by kernel's
apply_rela() exceeds 64k. Each PLT entry contains a short jump to an
expoline thunk located at the end of the PLT array, which is out of
range for the first PLT
Just as a side-note, Ilya:
The previous message that this bug is fixed, is only because we reverted the
following:
"debian/patches/gcc-ibmz-plt-revert.diff: Revert PLT changes from the gcc-11
branch, as causing kernel dkms missbuilts on s390x. LP: #1954676"
to become unblocked.
It's still
This bug was fixed in the package gcc-11 - 11.2.0-14ubuntu1
---
gcc-11 (11.2.0-14ubuntu1) jammy; urgency=medium
* Merge with Debian; remaining changes:
- Build from upstream sources.
gcc-11 (11.2.0-14) unstable; urgency=medium
* Update to git 20220112 from the gcc-11
** Changed in: gcc-11 (Ubuntu Jammy)
Status: New => Confirmed
** Changed in: ubuntu-z-systems
Status: New => Confirmed
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Title:
z13 appears to have been the key: I can reproduce this on a z13 LPAR.
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Title:
jammy 5.15 kernel soft lockup when zfs.ko is loaded on s390x w/
@arighi
Explicit nack on zfs-linux patches, that is incomplete merge that drops
ubuntu delta & zsys support.
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Title:
jammy 5.15 kernel soft
@ilja
Now this is starting to be more fun then. Note our mainframe is z13 2964
and we have reproduced the bug in both LPAR and KVM. I'll try to package
up a more concrete reproducer (to the point of tarring up a full chroot
with all the deps).
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Oh, my bad - I remember checking that I had the right compiler version,
and even verifying that the patch is in by compiling some samples, but I
guess then I ran a full upgrade after adding -proposed.
Unfortunately, downgrading the toolchain did not help - both manually
built and dkms-built
GCC: (Ubuntu 11.2.0-14ubuntu1) 11.2.0
^ This version of gcc is reverting the patch that introduces the bug. It
is possible to reproduce the bug with gcc <= 11.2.0-13ubuntu1.
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Hi, modules built with gcc-11 14ubuntu1 toolchain have the gcc-11 stable
ibmz PLT patch already reverted to make things work again.
One needs to downgrade gcc-11 to 13ubuntu1 to experience the breakage.
You can fetch older gcc-11 from
Thanks, Frank! I managed to install the jammy kernel, but the zfs module
still loads successfully. Here is some information from the manually
built module:
$ strings module/zfs/zfs.ko|grep -e vermagic= -e GCC -e ^version=|sort -u
GCC: (Ubuntu 11.2.0-14ubuntu1) 11.2.0
vermagic=5.15.0-16-generic
Hi Ilya, there is a 5.15 kernel for jammy aka 22.04 in the proposed section of
the archive.
Just enable proposed with:
"sudo add-apt-repository "deb http://us.ports.ubuntu.com/ubuntu-ports/
$(lsb_release -sc)-proposed main"
(for the src use "sudo add-apt-repository "deb-src
I don't seem to be able to reproduce this. What I tried so far:
1. Installed a clean VM using an image from http://ftp.uni-
kl.de/pub/linux/ubuntu-dvd/ubuntu-server/daily-live/pending/, ran apt
install zfs-dkms - zfs.ko initialization successful.
2. Built zfs master myself and loaded the modules
Sorry about that, I'm investigating.
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Title:
jammy 5.15 kernel soft lockup when zfs.ko is loaded on s390x w/ gcc >=
11.2.0-10ubuntu1 / gcc-11
** Also affects: ubuntu-z-systems
Importance: Undecided
Status: New
** Tags added: s390x
** Changed in: ubuntu-z-systems
Assignee: (unassigned) => bugproxy (bugproxy)
** Changed in: ubuntu-z-systems
Importance: Undecided => Critical
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