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Brian Behlendorf a76f3d0437
Fix deadlock in IO pipeline 
In vdev_queue_aggregate() the zio_execute() bypass should not be
called under the vdev queue lock.  This can result in a deadlock
as shown in the stack traces below.

Drop the vdev queue lock then walk the parents of the aggregate IO
to determine the list of component IOs to be bypassed.  This can
be done safely without holding the io_lock since the new aggregate
IO has not yet been returned and its parents cannot change.

---  THREAD 1 ---
arc_read()
  zio_nowait()
    zio_vdev_io_start()
      vdev_queue_io() <--- mutex_enter(vq->vq_lock)
        vdev_queue_io_to_issue()
          vdev_queue_aggregate()
            zio_execute()
              zio_vdev_io_assess()
                zio_wait_for_children() <- mutex_enter(zio->io_lock)

--- THREAD 2 --- (inverse order)
arc_read()
  zio_change_priority() <- mutex_enter(zio->zio_lock)
    vdev_queue_change_io_priority() <- mutex_enter(vq->vq_lock)

Reviewed-by: Tom Caputi <tcaputi@datto.com>
Reviewed-by: Don Brady <don.brady@delphix.com>
Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov>
Closes #7307
2018-03-16 16:46:06 -07:00
.github Reduce codecov PR comments 2018-01-09 11:15:55 -08:00
cmd Report pool suspended due to MMP 2018-03-15 10:56:55 -07:00
config Add kernel module auto-loading 2018-03-13 10:45:55 -07:00
contrib Fix some typos 2018-02-28 08:57:10 -08:00
etc Add kernel module auto-loading 2018-03-13 10:45:55 -07:00
include Report pool suspended due to MMP 2018-03-15 10:56:55 -07:00
lib Report pool suspended due to MMP 2018-03-15 10:56:55 -07:00
man OpenZFS 9188 - increase size of dbuf cache to reduce indirect block decompression 2018-03-13 10:52:48 -07:00
module Fix deadlock in IO pipeline 2018-03-16 16:46:06 -07:00
rpm Add kernel module auto-loading 2018-03-13 10:45:55 -07:00
scripts Fix free memory calculation on v3.14+ 2018-02-23 08:50:06 -08:00
tests OpenZFS 9076 - Adjust perf test concurrency settings 2018-03-15 10:51:00 -07:00
udev Add kernel module auto-loading 2018-03-13 10:45:55 -07:00
.gitignore Add configure option to enable gcov analysis 2017-09-15 10:24:13 -07:00
.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 Add a missing > to AUTHORS 2014-09-02 14:18:53 -07:00
autogen.sh build: do not call boilerplate ourself 2013-04-02 10:55:20 -07:00
configure.ac Take user namespaces into account in policy checks 2018-03-07 15:40:42 -08:00
copy-builtin Fix copy-builtin to work with ASAN patch 2018-01-12 09:39:36 -08:00
COPYRIGHT Encryption patch follow-up 2017-10-11 16:54:48 -04:00
DISCLAIMER Fix minor typos and update marketing copy. 2013-03-21 12:51:06 -07:00
Makefile.am Allow make checkstyle and paxscript in build dir 2018-02-21 12:35:59 -08:00
META Tag zfs-0.7.0 2017-07-26 10:13:25 -07:00
OPENSOLARIS.LICENSE Add CDDL license file 2008-12-01 14:49:34 -08:00
README.markdown Add scan.coverity.com badge to README 2017-10-30 16:21:24 -07:00
TEST Refresh TEST file to include new variables 2017-11-08 11:09:30 -08:00
zfs.release.in Move zfs.release generation to configure step 2012-07-12 12:22:51 -07:00

README.markdown

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ZFS on Linux is an advanced file system and volume manager which was originally developed for Solaris and is now maintained by the OpenZFS community.

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Official Resources

Installation

Full documentation for installing ZoL on your favorite Linux distribution can be found at our site.

Contribute & Develop

We have a separate document with contribution guidelines.