Messages in this thread | | | Date | Thu, 14 Apr 2016 13:39:22 -0400 | From | Matthew Wilcox <> | Subject | Re: [PATCH 09/10] huge pagecache: mmap_sem is unlocked when truncation splits pmd |
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On Tue, Apr 05, 2016 at 01:55:23PM -0700, Hugh Dickins wrote: > zap_pmd_range()'s CONFIG_DEBUG_VM !rwsem_is_locked(&mmap_sem) BUG() > will be invalid with huge pagecache, in whatever way it is implemented: > truncation of a hugely-mapped file to an unhugely-aligned size would > easily hit it.
We can reproduce this BUG() in the current Linus tree with DAX PMDs. Andrew, can you send this patch to Linus for inclusion in 4.7?
Tested-by: Matthew Wilcox <willy@linux.intel.com>
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