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Andriy Gapon b55ae64b50 MFV r308988: 7199, 7200 dsl_dataset_rollback_sync may try to free
already free blocks

7199 dsl_dataset_rollback_sync may try to free already free blocks
7200 no blocks must be born in a txg after a snaphot is created

illumos/illumos-gate@bfaed0b91e
bfaed0b91e

https://www.illumos.org/issues/7199
  dsl_dataset_rollback_sync may try to free already freed blocks when it calls
  dsl_destroy_head_sync_impl to destroy a temporary clone.
  That happens if a snapshot to which we are rolling back and from which the
  clone is created has some ZIL records.

https://www.illumos.org/issues/7200
  No new blocks must be born in a dataset in the same TXG after a snapshot of the
  dataset is taken.
  Those blocks would have the same blk_birth as the dataset's ds_prev_snap_txg
  and as such they would be presumed to belong o the snapshot while in fact they
  do not.
  All the datasets must be clean before sync tasks are run, so the described
  scenario may happen only if one of the sync tasks dirties the dataset and
  another sync task takes its snapshot.
  Then, there will be another sync pass because of the dirty data and the new
  blocks will be born in the same TXG when the data is written out.
  It seems that almost all of the existing sync tasks modify only MOS and do not
  dirty any objsets.
  The only exception that I've been able to identify so far is the rollback which
  can modify an objset when it zeroes out the objset's ZIL.

Reviewed by: Matthew Ahrens <mahrens@delphix.com>
Reviewed by: Brad Lewis <brad.lewis@delphix.com>
Approved by: Gordon Ross <gordon.w.ross@gmail.com>
Author: Andriy Gapon <andriy.gapon@clusterhq.com>

MFC after:	3 weeks
2016-11-24 10:29:21 +00:00
bin [dd] Revert the capsicum bits for now until it gets fixed. 2016-11-19 18:19:21 +00:00
cddl MFV r308989: 6428 set canmount=off on unmounted filesystem tries to 2016-11-24 10:11:09 +00:00
contrib Replay r304721 in contrib/ so the change won't get lost across import. 2016-11-22 08:30:32 +00:00
crypto MFV r308196: 2016-11-02 06:49:25 +00:00
etc rc.subr: $(ps -p $$ -o jid=) is always 0, so do not fork ps for it. 2016-11-20 18:21:05 +00:00
gnu Add full softfloat and hardfloat support for RISC-V. 2016-11-16 15:21:32 +00:00
include Vendor import of ntp-4.2.8p9. 2016-11-22 06:28:26 +00:00
kerberos5 DIRDEPS_BUILD: Update dependencies 2016-06-14 16:55:05 +00:00
lib Remove debugging code. 2016-11-23 10:52:19 +00:00
libexec Fix _mips_rtld_bind() to handle ELF filters. 2016-11-23 20:21:53 +00:00
release Set the 'vital' flag on the runtime and jail packages. 2016-11-21 23:29:28 +00:00
rescue DIRDEPS_BUILD: Update dependencies. 2016-11-13 00:11:30 +00:00
sbin Allocate a struct ifreq rather than using a (wrong) computed size for 2016-11-22 22:45:15 +00:00
secure Prefer ACFLAGS over CFLAGS for compiling aarch64 assembly files. 2016-10-26 20:12:30 +00:00
share Fix path for per-user nsmb.conf file 2016-11-24 10:04:20 +00:00
sys MFV r308988: 7199, 7200 dsl_dataset_rollback_sync may try to free 2016-11-24 10:29:21 +00:00
targets DIRDEPS_BUILD: Connect new dependencies. 2016-11-13 00:11:23 +00:00
tests Vendor import of ntp-4.2.8p9. 2016-11-22 06:28:26 +00:00
tools Fix comment typo. 2016-11-23 16:54:27 +00:00
usr.bin locale: fix display of "grouping" and "mon_grouping" values 2016-11-19 02:09:58 +00:00
usr.sbin Pass the correct size argument to ioctl(DIOCGSECTORSIZE) 2016-11-22 22:10:58 +00:00
.arcconfig callsign isn't required anymore 2016-09-29 06:19:45 +00:00
.arclint
COPYRIGHT
LOCKS
MAINTAINERS Remove myself from kern_timeout.c yeah! 2016-07-27 20:37:32 +00:00
Makefile Add full softfloat and hardfloat support for RISC-V. 2016-11-16 15:21:32 +00:00
Makefile.inc1 Add full softfloat and hardfloat support for RISC-V. 2016-11-16 15:21:32 +00:00
Makefile.libcompat Fix in-tree GCC builds after r304681. 2016-08-23 19:29:37 +00:00
ObsoleteFiles.inc share/man/man4/Makefile: Only install Hyper-V man pages on amd64 and i386 2016-11-24 05:52:28 +00:00
README README: remove nonexistent 'games' directory. 2016-05-18 10:43:13 +00:00
UPDATING Fix buildworld for powerpc. 2016-11-20 06:10:12 +00:00

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