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1e9231ada8
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Mark Roper 1e9231ada8
Prevent deadlock in arc_read in Linux memory reclaim callback 
Using zfs with Lustre, an arc_read can trigger kernel memory allocation
that in turn leads to a memory reclaim callback and a deadlock within a
single zfs process. This change uses spl_fstrans_mark and
spl_trans_unmark to prevent the reclaim attempt and the deadlock
(https://zfsonlinux.topicbox.com/groups/zfs-devel/T4db2c705ec1804ba).
The stack trace observed is:

    __schedule at ffffffff81610f2e
    schedule at ffffffff81611558
    schedule_preempt_disabled at ffffffff8161184a
    __mutex_lock at ffffffff816131e8
    arc_buf_destroy at ffffffffa0bf37d7 [zfs]
    dbuf_destroy at ffffffffa0bfa6fe [zfs]
    dbuf_evict_one at ffffffffa0bfaa96 [zfs]
    dbuf_rele_and_unlock at ffffffffa0bfa561 [zfs]
    dbuf_rele_and_unlock at ffffffffa0bfa32b [zfs]
    osd_object_delete at ffffffffa0b64ecc [osd_zfs]
    lu_object_free at ffffffffa06d6a74 [obdclass]
    lu_site_purge_objects at ffffffffa06d7fc1 [obdclass]
    lu_cache_shrink_scan at ffffffffa06d81b8 [obdclass]
    shrink_slab at ffffffff811ca9d8
    shrink_node at ffffffff811cfd94
    do_try_to_free_pages at ffffffff811cfe63
    try_to_free_pages at ffffffff811d01c4
    __alloc_pages_slowpath at ffffffff811be7f2
    __alloc_pages_nodemask at ffffffff811bf3ed
    new_slab at ffffffff81226304
    ___slab_alloc at ffffffff812272ab
    __slab_alloc at ffffffff8122740c
    kmem_cache_alloc at ffffffff81227578
    spl_kmem_cache_alloc at ffffffffa048a1fd [spl]
    arc_buf_alloc_impl at ffffffffa0befba2 [zfs]
    arc_read at ffffffffa0bf0924 [zfs]
    dbuf_read at ffffffffa0bf9083 [zfs]
    dmu_buf_hold_by_dnode at ffffffffa0c04869 [zfs]

Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov>
Signed-off-by: Mark Roper <markroper@gmail.com>
Closes #9987
2020-03-12 10:24:43 -07:00
.github Add an .editorconfig; document git whitespace settings 2020-01-27 13:32:52 -08:00
cmd Add trim support to zpool wait 2020-03-04 15:07:11 -08:00
config Fix CONFIG_MODULES=no Linux kernel config 2020-02-28 09:23:48 -08:00
contrib Fix zfs-functions packaging bug 2020-03-10 09:53:20 -07:00
etc Fix zfs-functions packaging bug 2020-03-10 09:53:20 -07:00
include Improve zfs send performance by bypassing the ARC 2020-03-10 10:51:04 -07:00
lib Change default to overlay=on 2020-03-06 09:28:19 -08:00
man Change default to overlay=on 2020-03-06 09:28:19 -08:00
module Prevent deadlock in arc_read in Linux memory reclaim callback 2020-03-12 10:24:43 -07:00
rpm Change http://zfsonlinux.org links to https://zfsonlinux.org 2020-01-13 16:43:59 -08:00
scripts zloop.sh should call ZDB with pool name 2020-03-11 10:02:23 -07:00
tests ZTS: Add a failsafe callback to run after each test 2020-03-10 11:00:56 -07:00
udev Create symbolic links in /dev/disk/by-vdev for nvme disk devices 2019-12-17 17:50:20 -08:00
.editorconfig Add an .editorconfig; document git whitespace settings 2020-01-27 13:32:52 -08:00
.gitignore Adapt gitignore for modules 2019-12-02 13:23:47 -08:00
.gitmodules Add zimport.sh compatibility test script 2014-02-21 12:10:31 -08:00
.travis.yml Add .travis.yml 2017-11-13 09:18:18 -08:00
AUTHORS Update build system and packaging 2018-05-29 16:00:33 -07:00
autogen.sh Cause autogen.sh to fail if autoreconf fails 2018-07-06 09:27:37 -07:00
CODE_OF_CONDUCT.md Add CODE_OF_CONDUCT.md 2019-04-30 10:58:45 -07:00
configure.ac Fix zfs-functions packaging bug 2020-03-10 09:53:20 -07:00
copy-builtin bash scripts: use /usr/bin/env for bash shebangs 2020-02-10 13:13:46 -08:00
COPYRIGHT ICP: Improve AES-GCM performance 2020-02-10 12:59:50 -08:00
LICENSE Update build system and packaging 2018-05-29 16:00:33 -07:00
Makefile.am Perform KABI checks in parallel 2019-10-01 12:50:34 -07:00
META Update maximum kernel version to 5.4 2019-12-23 14:24:36 -08:00
NEWS Add NEWS file 2018-09-18 12:03:47 -07:00
NOTICE Update build system and packaging 2018-05-29 16:00:33 -07:00
README.md Update README for OpenZFS 2020-02-25 11:43:20 -08:00
TEST Update build system and packaging 2018-05-29 16:00:33 -07:00
zfs.release.in Move zfs.release generation to configure step 2012-07-12 12:22:51 -07:00

README.md

img

OpenZFS is an advanced file system and volume manager which was originally developed for Solaris and is now maintained by the OpenZFS community. This repository contains the code for running OpenZFS on Linux and FreeBSD.

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Official Resources

  • Wiki - for using and developing this repo
  • ZoL Site - Linux release info & links
  • Mailing lists
  • OpenZFS site - for conference videos and info on other platforms (illumos, OSX, Windows, etc)

Installation

Full documentation for installing OpenZFS on your favorite Linux distribution can be found at the ZoL Site.

FreeBSD support is a work in progress. See the PR.

Contribute & Develop

We have a separate document with contribution guidelines.

We have a Code of Conduct.

Release

OpenZFS is released under a CDDL license. For more details see the NOTICE, LICENSE and COPYRIGHT files; UCRL-CODE-235197

Supported Kernels

  • The META file contains the officially recognized supported Linux kernel versions.