https://github.com/torvalds/linux
Revision 6051d3bd3b91e96c59e62b8be2dba1cc2b19ee40 authored by Henry Burns on 13 August 2019, 22:37:21 UTC, committed by Linus Torvalds on 13 August 2019, 23:06:52 UTC
The constraint from the zpool use of z3fold_destroy_pool() is there are no outstanding handles to memory (so no active allocations), but it is possible for there to be outstanding work on either of the two wqs in the pool. If there is work queued on pool->compact_workqueue when it is called, z3fold_destroy_pool() will do: z3fold_destroy_pool() destroy_workqueue(pool->release_wq) destroy_workqueue(pool->compact_wq) drain_workqueue(pool->compact_wq) do_compact_page(zhdr) kref_put(&zhdr->refcount) __release_z3fold_page(zhdr, ...) queue_work_on(pool->release_wq, &pool->work) *BOOM* So compact_wq needs to be destroyed before release_wq. Link: http://lkml.kernel.org/r/20190726224810.79660-1-henryburns@google.com Fixes: 5d03a6613957 ("mm/z3fold.c: use kref to prevent page free/compact race") Signed-off-by: Henry Burns <henryburns@google.com> Reviewed-by: Shakeel Butt <shakeelb@google.com> Reviewed-by: Jonathan Adams <jwadams@google.com> Cc: Vitaly Vul <vitaly.vul@sony.com> Cc: Vitaly Wool <vitalywool@gmail.com> Cc: David Howells <dhowells@redhat.com> Cc: Thomas Gleixner <tglx@linutronix.de> Cc: Al Viro <viro@zeniv.linux.org.uk Cc: Henry Burns <henrywolfeburns@gmail.com> Cc: <stable@vger.kernel.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
1 parent a53190a
Tip revision: 6051d3bd3b91e96c59e62b8be2dba1cc2b19ee40 authored by Henry Burns on 13 August 2019, 22:37:21 UTC
mm/z3fold.c: fix z3fold_destroy_pool() ordering
mm/z3fold.c: fix z3fold_destroy_pool() ordering
Tip revision: 6051d3b
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kernel | ||
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net | ||
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.cocciconfig | -rw-r--r-- | 59 bytes |
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.gitignore | -rw-r--r-- | 1.7 KB |
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COPYING | -rw-r--r-- | 423 bytes |
CREDITS | -rw-r--r-- | 97.1 KB |
Kbuild | -rw-r--r-- | 1.5 KB |
Kconfig | -rw-r--r-- | 595 bytes |
MAINTAINERS | -rw-r--r-- | 510.2 KB |
Makefile | -rw-r--r-- | 59.7 KB |
README | -rw-r--r-- | 727 bytes |
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