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| author | Hugh Dickins <hughd@google.com> | 2020-08-20 17:42:02 -0700 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2020-08-26 10:40:48 +0200 |
| commit | 9f4f7c08d50b202a9e4478762f464524215789a6 (patch) | |
| tree | b8c7802ddade8d29b2fdcb4bf6b69a16b1994c74 | |
| parent | 9a05b774af30ec11913c770a2df2522409fb7447 (diff) | |
| download | linux-stable-9f4f7c08d50b202a9e4478762f464524215789a6.tar.gz linux-stable-9f4f7c08d50b202a9e4478762f464524215789a6.tar.bz2 linux-stable-9f4f7c08d50b202a9e4478762f464524215789a6.zip | |
khugepaged: adjust VM_BUG_ON_MM() in __khugepaged_enter()
[ Upstream commit f3f99d63a8156c7a4a6b20aac22b53c5579c7dc1 ]
syzbot crashes on the VM_BUG_ON_MM(khugepaged_test_exit(mm), mm) in
__khugepaged_enter(): yes, when one thread is about to dump core, has set
core_state, and is waiting for others, another might do something calling
__khugepaged_enter(), which now crashes because I lumped the core_state
test (known as "mmget_still_valid") into khugepaged_test_exit(). I still
think it's best to lump them together, so just in this exceptional case,
check mm->mm_users directly instead of khugepaged_test_exit().
Fixes: bbe98f9cadff ("khugepaged: khugepaged_test_exit() check mmget_still_valid()")
Reported-by: syzbot <syzkaller@googlegroups.com>
Signed-off-by: Hugh Dickins <hughd@google.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Acked-by: Yang Shi <shy828301@gmail.com>
Cc: "Kirill A. Shutemov" <kirill.shutemov@linux.intel.com>
Cc: Andrea Arcangeli <aarcange@redhat.com>
Cc: Song Liu <songliubraving@fb.com>
Cc: Mike Kravetz <mike.kravetz@oracle.com>
Cc: Eric Dumazet <edumazet@google.com>
Cc: <stable@vger.kernel.org> [4.8+]
Link: http://lkml.kernel.org/r/alpine.LSU.2.11.2008141503370.18085@eggly.anvils
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
| -rw-r--r-- | mm/khugepaged.c | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/mm/khugepaged.c b/mm/khugepaged.c index 76e3e90dbc16..3623d1c5343f 100644 --- a/mm/khugepaged.c +++ b/mm/khugepaged.c @@ -438,7 +438,7 @@ int __khugepaged_enter(struct mm_struct *mm) return -ENOMEM; /* __khugepaged_exit() must not run from under us */ - VM_BUG_ON_MM(khugepaged_test_exit(mm), mm); + VM_BUG_ON_MM(atomic_read(&mm->mm_users) == 0, mm); if (unlikely(test_and_set_bit(MMF_VM_HUGEPAGE, &mm->flags))) { free_mm_slot(mm_slot); return 0; |