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Gvozden Neskovic
d22323e89f
Reported by kmemleak during testing of a new patch:
```
unreferenced object 0xffff9f1c12e38800 (size 1024):
comm "z_upgrade", pid 17842, jiffies 4296870904 (age 8746.268s)
backtrace:
kmemleak_alloc+0x7a/0x100
__kmalloc_node+0x26c/0x510
range_tree_create+0x39/0xa0 [zfs]
dmu_zfetch_init+0x73/0xe0 [zfs]
dnode_create+0x12c/0x3b0 [zfs]
dnode_hold_impl+0x1096/0x1130 [zfs]
dnode_hold+0x23/0x30 [zfs]
dmu_bonus_hold_impl+0x6b/0x370 [zfs]
dmu_bonus_hold+0x1e/0x30 [zfs]
dmu_objset_space_upgrade+0x114/0x310 [zfs]
dmu_objset_userobjspace_upgrade_cb+0xd8/0x150 [zfs]
dmu_objset_upgrade_task_cb+0x136/0x1e0 [zfs]
kthread+0x119/0x150
```
Reviewed-by: George Melikov <mail@gmelikov.ru>
Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov>
Reviewed-by: Giuseppe Di Natale <dinatale2@llnl.gov>
Signed-off-by: Gvozden Neskovic <neskovic@gmail.com>
Closes #6575
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