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authorJustin T. Gibbs <[email protected]>2015-04-02 14:44:32 +1100
committerBrian Behlendorf <[email protected]>2015-04-28 16:25:34 -0700
commit0c66c32d1d8b64a261cceb5f50a9e86777c5d0b2 (patch)
tree82f5630e8a4e77931e9992db3a7fac1964414716 /config/kernel-evict-inode.m4
parentd683ddbb7272a179da3918cc4f922d92a2195ba2 (diff)
Illumos 5056 - ZFS deadlock on db_mtx and dn_holds
5056 ZFS deadlock on db_mtx and dn_holds Author: Justin Gibbs <[email protected]> Reviewed by: Will Andrews <[email protected]> Reviewed by: Matt Ahrens <[email protected]> Reviewed by: George Wilson <[email protected]> Approved by: Dan McDonald <[email protected]> References: https://www.illumos.org/issues/5056 https://github.com/illumos/illumos-gate/commit/bc9014e Porting Notes: sa_handle_get_from_db(): - the original patch includes an otherwise unmentioned fix for a possible usage of an uninitialised variable dmu_objset_open_impl(): - Under Illumos list_link_init() is the same as filling a list_node_t with NULLs, so they don't notice if they miss doing list_link_init() on a zero'd containing structure (e.g. allocated with kmem_zalloc as here). Under Linux, not so much: an uninitialised list_node_t goes "Boom!" some time later when it's used or destroyed. dmu_objset_evict_dbufs(): - reduce stack usage using kmem_alloc() Ported-by: Chris Dunlop <[email protected]> Signed-off-by: Brian Behlendorf <[email protected]>
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