Your message dated Mon, 27 Apr 2020 04:00:09 +
with message-id
and subject line Bug#953017: fixed in linux 4.19.118-1
has caused the Debian Bug report #953017,
regarding linux-image-amd64: Regression from "mm/vmalloc: Sync unmappings in
__purge_vmap_area_lazy()"
to be marked as done.
This means that you claim that the problem has been dealt with.
If this is not the case it is now your responsibility to reopen the
Bug report if necessary, and/or fix the problem forthwith.
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--
953017: https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=953017
Debian Bug Tracking System
Contact ow...@bugs.debian.org with problems
--- Begin Message ---
Package: linux-image-amd64
Version: 5.4.13-1~bpo10+1
Severity: important
Tags: upstream patch
Dear Maintainer,
A performance regression stemming from the patch "mm/vmalloc: Sync
unmappings in __purge_vmap_area_lazy()" in all mainline and current
stable kernels, except 3.16.y, was reported by multiple persons [1].
The regression involves any activity that exercises vmalloc a lot,
such as creating threads with CONFIG_VMAP_STACK=y or tty allocation
(for example by SSH servers).
A fix [2] for this was posted last October and was picked up in the
-mm tree last November [3]. However this fix did not make it into
v5.6-rc or any other release. It is still only in the -mm tree.
AFAICT this regression only impacts x86 platforms, as it is the only
platform that has a custom vmalloc_sync_all() instead of the standard
no-op stub.
As per my report to upstream, I currently have one production server
running with the offending patch reverted. I also have another with
the fix applied, and that seems to work well.
Please consider adding the fix to Debian kernel images until upstream
kernels have it.
[1] https://www.spinics.net/lists/stable/msg349763.html
[2] https://patchwork.kernel.org/patch/11181159/
[3] https://www.spinics.net/lists/mm-commits/msg141749.html
-- System Information:
Debian Release: 10.3
APT prefers stable-updates
APT policy: (500, 'stable-updates'), (500, 'stable')
Architecture: amd64 (x86_64)
Foreign Architectures: armhf, i386, arm64
Kernel: Linux 5.2.0-0.bpo.2-amd64 (SMP w/8 CPU cores)
Locale: LANG=zh_TW.UTF-8, LC_CTYPE=zh_TW.UTF-8 (charmap=UTF-8),
LANGUAGE=zh_TW.UTF-8 (charmap=UTF-8)
Shell: /bin/sh linked to /bin/dash
Init: sysvinit (via /sbin/init)
Versions of packages linux-image-amd64 depends on:
ii linux-image-5.4.0-0.bpo.3-amd64 5.4.13-1~bpo10+1
linux-image-amd64 recommends no packages.
linux-image-amd64 suggests no packages.
-- no debconf information
--- End Message ---
--- Begin Message ---
Source: linux
Source-Version: 4.19.118-1
Done: Ben Hutchings
We believe that the bug you reported is fixed in the latest version of
linux, which is due to be installed in the Debian FTP archive.
A summary of the changes between this version and the previous one is
attached.
Thank you for reporting the bug, which will now be closed. If you
have further comments please address them to 953...@bugs.debian.org,
and the maintainer will reopen the bug report if appropriate.
Debian distribution maintenance software
pp.
Ben Hutchings (supplier of updated linux package)
(This message was generated automatically at their request; if you
believe that there is a problem with it please contact the archive
administrators by mailing ftpmas...@ftp-master.debian.org)
-BEGIN PGP SIGNED MESSAGE-
Hash: SHA512
Format: 1.8
Date: Sun, 26 Apr 2020 14:04:11 +0100
Source: linux
Architecture: source
Version: 4.19.118-1
Distribution: buster
Urgency: medium
Maintainer: Debian Kernel Team
Changed-By: Ben Hutchings
Closes: 947021 951274 953017 955366
Changes:
linux (4.19.118-1) buster; urgency=medium
.
* New upstream stable update:
https://www.kernel.org/pub/linux/kernel/v4.x/ChangeLog-4.19.99
- Revert "efi: Fix debugobjects warning on 'efi_rts_work'"
- xfs: Sanity check flags of Q_XQUOTARM call
- [x86] mfd: intel-lpss: Add default I2C device properties for Gemini Lake
- SUNRPC: Fix svcauth_gss_proxy_init()
- [powerpc*] pseries: Enable support for ibm,drc-info property
- tipc: update mon's self addr when node addr generated
- tipc: fix wrong timeout input for tipc_wait_for_cond()
- mt7601u: fix bbp version check in mt7601u_wait_bbp_ready
- [armhf] crypto: sun4i-ss - fix big endian issues
- perf map: No need to adjust the long name of modules
- ipmi: Fix memory leak in __ipmi_bmc_register (CVE-2019-19046)
- ixgbe: don't clear IPsec sa counters on HW clearing
- drm/virtio: fix bounds check in virtio_gpu_cmd_get_capset()
- iio: fix position relative kernel version
- apparmor: Fix network performance issue in aa_label_sk_perm
- ALSA: hda: fix unused variable warning
-
