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 gRdHniuT Z10QP+OXJSkgIF3FQUU7xHFc8pSYoyKKH8B2160paXwDJagNlJHZHPLHssqWyg7pH8LUgU2AGI82FZ+2fdjOVRNiPrw+j8MC9uudi2v7Jr+vjHNtcKMYTPO8wG6Z5QxbDIwSwGefLbBb1Sy71f2DgBKVY6tdNRjs1MWJpsWVZHOPQQqYONaq/6WLyFUfeT4KA53rPJzX3wg5WZ7Pt9QPmP73lzBGIMCAofD+88eS6q5C5iBegCJv1Cb/JJC6lJt6Fmr63xM3xCJOgSlheZgEYiBj3u/Orj/J0aUkeCHa7jyoL/VocnY3edKJ9n+fcGqCNPKLksttY3uzzu+NaSitAlIX2eSXkfc3kbvCZF4RbCr+mDlLQBkCR2F09q27FubO1AVAlv9On6P9Rcln8OYmOX2hCalWKBqXThHthHk9c6fU0Tw37l3vuqT1qUbpdkjJJK8ZFAqiALuI95ZE07alINQK5ju6O1EGHO6fV Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: X-Spam-Checker-Version: SpamAssassin 4.0.1 (2024-03-26) on aws-us-west-2-korg-listserv-alma10-1 On Tue, Oct 27, 2026 at 04:09:23PM -0400, Mani Tofigh via B4 Relay wrote: > From: Mani Tofigh > > mm->owner is written with WRITE_ONCE() when ownership moves to another > task, but mm_update_next_owner() reads it with a plain load. The race > is expected, so read it with READ_ONCE() to match the writer. > > [ 14.915975] BUG: KCSAN: data-race in mm_update_next_owner / try_to_set_owner > > [ 14.916154] write (marked) to 0xff11000004471b80 of 8 bytes by task 71 on cpu 0: > [ 14.916204] try_to_set_owner+0x100/0x140 > [ 14.916302] mm_update_next_owner+0x177/0x300 > ... > > [ 14.917246] read to 0xff11000004471b80 of 8 bytes by task 75 on cpu 1: > [ 14.917293] mm_update_next_owner+0x2a/0x300 > [ 14.917396] do_exit+0x575/0x18b0 > ... > > [ 14.923906] value changed: 0xff1100002ec04180 -> 0xff1100002ed3a0c0 > > Found with KCSAN while fuzzing under a deterministic hypervisor that's > currently under development. > > Signed-off-by: Mani Tofigh > --- > kernel/exit.c | 2 +- > 1 file changed, 1 insertion(+), 1 deletion(-) > > diff --git a/kernel/exit.c b/kernel/exit.c > index d5e7bc2af804..cc78596db74d 100644 > --- a/kernel/exit.c > +++ b/kernel/exit.c > @@ -494,7 +494,7 @@ void mm_update_next_owner(struct mm_struct *mm) > * If the exiting or execing task is not the owner, it's > * someone else's problem. > */ > - if (mm->owner != p) > + if (READ_ONCE(mm->owner) != p) > return; > /* > * The current owner is exiting/execing and there are no other > Acked-by: Balbir Singh Balbir