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- Also allocate a default private futex hash on vfork()

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as well, to avoid races with (private) futex waiters
    (Peter Zijlstra)
 
 Signed-off-by: Ingo Molnar <mingo@kernel.org>
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Merge tag 'locking-urgent-2026-09-20' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip

Pull futex fix from Ingo Molnar:

 - Also allocate a default private futex hash on vfork() as well, to
   avoid races with (private) futex waiters (Peter Zijlstra)

* tag 'locking-urgent-2026-09-20' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
  futex: Also allocate private hash on vfork()
This commit is contained in:
Linus Torvalds 2026-09-20 08:15:23 -07:00
commit bdab18633a
1 changed files with 2 additions and 2 deletions
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4
kernel/fork.c
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@ -1996,9 +1996,9 @@ static bool need_futex_hash_allocate_default(u64 clone_flags)
{
/*
* Allocate a default futex hash for any sibling that will
* share the parent's mm, except vfork.
* share the parent's mm.
*/
return (clone_flags & (CLONE_VM | CLONE_VFORK)) == CLONE_VM;
return clone_flags & CLONE_VM;
}
/*