linux-kernel - linux-next 20170519

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Date:   Sat, 20 May 2017 16:18:50 -0400
From:   valdis.kletnieks@...edu
To:     Manfred Spraul <manfred@...orfullife.com>,
        Kees Cook <keescook@...omium.org>
Cc:     linux-kernel@...r.kernel.org,
        Andrew Morton <akpm@...ux-foundation.org>
Subject: linux-next 20170519 - semaphores broken

Seeing problems with programs that use semaphores.  The one
that I'm getting bit by is jackd.  strace says:

getuid()                                = 967
semget(0x282929, 0, 000)                = 229376
semop(229376, [{0, -1, SEM_UNDO}], 1)   = -1 EIDRM (Identifier removed)
write(2, "JACK semaphore error: semop (Ide"..., 49JACK semaphore error: semop (Identifier removed)
) = 49

Bisects down to this commit, and reverting it from 20170519 makes things work
again.  No idea why this causes indigestion, there's probably something subtly
wrong here....

commit 337f43326737b5eb28eb13f43c27a5788da0f913
Author: Manfred Spraul <manfred@...orfullife.com>
Date:   Fri May 19 07:39:23 2017 +1000

    ipc: merge ipc_rcu and kern_ipc_perm

    ipc has two management structures that exist for every id:
    - struct kern_ipc_perm, it contains e.g. the permissions.
    - struct ipc_rcu, it contains the rcu head for rcu handling and
      the refcount.






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