Hugh Dickins 732ed55823
mm/thp: try_to_unmap() use TTU_SYNC for safe splitting ...
Stressing huge tmpfs often crashed on unmap_page()'s VM_BUG_ON_PAGE
(!unmap_success): with dump_page() showing mapcount:1, but then its raw
struct page output showing _mapcount ffffffff i.e. mapcount 0.
And even if that particular VM_BUG_ON_PAGE(!unmap_success) is removed,
it is immediately followed by a VM_BUG_ON_PAGE(compound_mapcount(head)),
and further down an IS_ENABLED(CONFIG_DEBUG_VM) total_mapcount BUG():
all indicative of some mapcount difficulty in development here perhaps.
But the !CONFIG_DEBUG_VM path handles the failures correctly and
silently.
I believe the problem is that once a racing unmap has cleared pte or
pmd, try_to_unmap_one() may skip taking the page table lock, and emerge
from try_to_unmap() before the racing task has reached decrementing
mapcount.
Instead of abandoning the unsafe VM_BUG_ON_PAGE(), and the ones that
follow, use PVMW_SYNC in try_to_unmap_one() in this case: adding
TTU_SYNC to the options, and passing that from unmap_page().
When CONFIG_DEBUG_VM, or for non-debug too? Consensus is to do the same
for both: the slight overhead added should rarely matter, except perhaps
if splitting sparsely-populated multiply-mapped shmem. Once confident
that bugs are fixed, TTU_SYNC here can be removed, and the race
tolerated.
Link: https://lkml.kernel.org/r/c1e95853-8bcd-d8fd-55fa-e7f2488e78f@google.com
Fixes: fec89c109fhughd@google.com >
Cc: Alistair Popple <apopple@nvidia.com >
Cc: Jan Kara <jack@suse.cz >
Cc: Jue Wang <juew@google.com >
Cc: Kirill A. Shutemov <kirill.shutemov@linux.intel.com >
Cc: "Matthew Wilcox (Oracle)" <willy@infradead.org >
Cc: Miaohe Lin <linmiaohe@huawei.com >
Cc: Minchan Kim <minchan@kernel.org >
Cc: Naoya Horiguchi <naoya.horiguchi@nec.com >
Cc: Oscar Salvador <osalvador@suse.de >
Cc: Peter Xu <peterx@redhat.com >
Cc: Ralph Campbell <rcampbell@nvidia.com >
Cc: Shakeel Butt <shakeelb@google.com >
Cc: Wang Yugui <wangyugui@e16-tech.com >
Cc: Yang Shi <shy828301@gmail.com >
Cc: Zi Yan <ziy@nvidia.com >
Cc: <stable@vger.kernel.org >
Signed-off-by: Andrew Morton <akpm@linux-foundation.org >
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org >
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Hugh Dickins
732ed55823