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For the null pointer issue shown below, the solution is to initialize the
contents of the object before changing its type, so that concurrent accessors
will see it as non-zapified until it is ready for access via the ZAP.
BAD TRAP: type=e (#pf Page fault) rp=ffffff00ff520440 addr=20 occurred
in module "zfs" due to a NULL pointer dereference
ffffff00ff520320 unix:die+df ()
ffffff00ff520430 unix:trap+dc0 ()
ffffff00ff520440 unix:cmntrap+e6 ()
ffffff00ff520590 zfs:zap_leaf_lookup+46 ()
ffffff00ff520640 zfs:fzap_lookup+a9 ()
ffffff00ff5206e0 zfs:zap_lookup_norm+111 ()
ffffff00ff520730 zfs:zap_contains+42 ()
ffffff00ff520760 zfs:dsl_dataset_has_resume_receive_state+47 ()
ffffff00ff520900 zfs:get_receive_resume_stats+3e ()
ffffff00ff520a90 zfs:dsl_dataset_stats+262 ()
ffffff00ff520ac0 zfs:dmu_objset_stats+2b ()
ffffff00ff520b10 zfs:zfs_ioc_objset_stats_impl+64 ()
ffffff00ff520b60 zfs:zfs_ioc_objset_stats+33 ()
ffffff00ff520bd0 zfs:zfs_ioc_dataset_list_next+140 ()
ffffff00ff520c80 zfs:zfsdev_ioctl+4d7 ()
ffffff00ff520cc0 genunix:cdev_ioctl+39 ()
ffffff00ff520d10 specfs:spec_ioctl+60 ()
ffffff00ff520da0 genunix:fop_ioctl+55 ()
ffffff00ff520ec0 genunix:ioctl+9b ()
ffffff00ff520f10 unix:brand_sys_sysenter+1c9 ()
Porting Notes:
* DMU_OT_BYTESWAP conditional in zap_lockdir_impl() kept.
Authored by: Matthew Ahrens <mahrens@delphix.com>
Reviewed by: Pavel Zakharov <pavel.zakharov@delphix.com>
Reviewed by: Brad Lewis <brad.lewis@delphix.com>
Reviewed-by: George Melikov <mail@gmelikov.ru>
Approved by: Dan McDonald <danmcd@joyent.com>
Ported-by: Brian Behlendorf <behlendorf1@llnl.gov>
OpenZFS-issue: https://illumos.org/issues/9329
OpenZFS-commit: https://github.com/openzfs/openzfs/commit/e8e0f97
Closes #7578
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