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Matthew Ahrens
2ade4a99f0
The sync thread is concurrently modifying dn_phys->dn_nlevels while dbuf_dirty() is trying to assert something about it, without holding the necessary lock. We need to move this assertion further down in the function, after we have acquired the dn_struct_rwlock. Authored by: Matthew Ahrens <mahrens@delphix.com> Reviewed by: Pavel Zakharov <pavel.zakharov@delphix.com> Reviewed by: Serapheim Dimitropoulos <serapheim@delphix.com> Approved by: Robert Mustacchi <rm@joyent.com> Reviewed-by: George Melikov <mail@gmelikov.ru> Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov> Ported-by: Giuseppe Di Natale <dinatale2@llnl.gov> OpenZFS-issue: https://www.illumos.org/issues/8126 OpenZFS-commit: https://github.com/openzfs/openzfs/commit/0ef125d Closes #6314
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