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ilbsmart 98bb45e27a 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
2019-02-22 09:47:34 -08:00
.github Bump commit subject length to 72 characters 2019-02-22 09:47:34 -08:00
cmd Add enclosure_symlinks option to vdev_id 2019-02-22 09:47:34 -08:00
config Rename macro ZFS_MINOR due to Lustre conflict 2019-02-22 09:47:34 -08:00
contrib Honor --with-mounthelperdir where applicable 2019-02-22 09:47:34 -08:00
etc Add enclosure_symlinks option to vdev_id 2019-02-22 09:47:34 -08:00
include deadlock between mm_sem and tx assign in zfs_write() and page fault 2019-02-22 09:47:34 -08:00
lib Add kernel module auto-loading 2019-02-22 09:47:34 -08:00
man zfs.8 uses wrong snapshot names in Example 15 2019-02-22 09:47:34 -08:00
module deadlock between mm_sem and tx assign in zfs_write() and page fault 2019-02-22 09:47:34 -08:00
rpm Add kernel module auto-loading 2019-02-22 09:47:34 -08:00
scripts dkms: Enable debuginfo option to be set with zfs sysconfig file 2019-02-22 09:47:34 -08:00
tests deadlock between mm_sem and tx assign in zfs_write() and page fault 2019-02-22 09:47:34 -08:00
udev Add enclosure_symlinks option to vdev_id 2019-02-22 09:47:34 -08:00
.gitignore Add configure option to enable gcov analysis 2018-03-14 16:10:36 -07:00
.gitmodules Add zimport.sh compatibility test script 2014-02-21 12:10:31 -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 contrib/initramfs: switch to automake 2019-02-22 09:47:33 -08:00
copy-builtin Allow c99 when building ZFS in the kernel tree 2017-03-27 12:31:15 -07:00
COPYRIGHT Update ZED copyright boilerplate 2015-05-11 15:07:00 -07:00
DISCLAIMER Fix minor typos and update marketing copy. 2013-03-21 12:51:06 -07:00
Makefile.am Add support for "--enable-code-coverage" option 2018-03-14 16:10:36 -07:00
META Tag zfs-0.7.12 2018-11-08 14:38:37 -08:00
OPENSOLARIS.LICENSE Add CDDL license file 2008-12-01 14:49:34 -08:00
README.markdown Update codecov.yml 2018-03-14 16:10:36 -07:00
TEST Retire filebench testing 2017-06-01 06:24:28 -07:00
zfs-script-config.sh.in zpool iostat/status -c improvements 2017-06-05 10:52:15 -07:00
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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