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ilbsmart 779a6c0bf6 deadlock between mm_sem and tx assign in zfs_write() and page fault 
The bug time sequence:
1. thread #1, `zfs_write` assign a txg "n".
2. In a same process, thread #2, mmap page fault (which means the
   `mm_sem` is hold) occurred, `zfs_dirty_inode` open a txg failed,
   and wait previous txg "n" completed.
3. thread #1 call `uiomove` to write, however page fault is occurred
   in `uiomove`, which means it need `mm_sem`, but `mm_sem` is hold by
   thread #2, so it stuck and can't complete,  then txg "n" will
   not complete.

So thread #1 and thread #2 are deadlocked.

Reviewed-by: Chunwei Chen <tuxoko@gmail.com>
Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov>
Reviewed-by: Matthew Ahrens <mahrens@delphix.com>
Signed-off-by: Grady Wong <grady.w@xtaotech.com>
Closes #7939
2018-10-16 11:11:24 -07:00
.github Add new wiki page to CONTRIBUTING 2018-09-18 08:58:15 -07:00
cmd OpenZFS 9847 - leaking dd_clones (DMU_OT_DSL_CLONES) objects (#7979) 2018-10-12 11:28:26 -07:00
config Fix statfs(2) for 32-bit user space 2018-09-24 17:11:25 -07:00
contrib Check scheduler for "noop" before setting "noop" 2018-10-10 08:46:22 -07:00
etc Minor documentation, logging, and testing typos 2018-06-07 09:38:39 -07:00
include deadlock between mm_sem and tx assign in zfs_write() and page fault 2018-10-16 11:11:24 -07:00
lib Fix changelist mounted-dataset iteration 2018-10-10 21:13:13 -07:00
man OpenZFS 9617 - too-frequent TXG sync causes excessive write inflation 2018-10-04 13:13:28 -07:00
module deadlock between mm_sem and tx assign in zfs_write() and page fault 2018-10-16 11:11:24 -07:00
rpm Add zts-report.py to python shebang exclusion 2018-10-15 16:59:28 -07:00
scripts OpenZFS 9689 - zfs range lock code should not be zpl-specific 2018-10-11 10:19:33 -07:00
tests deadlock between mm_sem and tx assign in zfs_write() and page fault 2018-10-16 11:11:24 -07:00
udev Add kernel module auto-loading 2018-03-13 10:45:55 -07:00
.gitignore Ignore *.o.ur-safe build artifacts 2018-05-13 18:59:02 -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 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
configure.ac Fixes for procfs files backed by linked lists 2018-09-26 11:08:12 -07:00
copy-builtin Create /proc/sys/kernel/spl/gitrev with git hash 2018-10-08 21:57:02 -07:00
COPYRIGHT Update build system and packaging 2018-05-29 16:00:33 -07:00
LICENSE Update build system and packaging 2018-05-29 16:00:33 -07:00
Makefile.am Create /proc/sys/kernel/spl/gitrev with git hash 2018-10-08 21:57:02 -07:00
META Tag 0.8.0-rc1 2018-09-07 09:35:09 -07:00
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 Explicitly state supported Linux versions 2018-05-30 20:11:19 -07:00
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

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.

Release

ZFS on Linux 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 kernel versions.