Again replying to myself, sorry:
Jack Steiner wrote:
On Fri, Dec 23, 2005 at 11:23:11PM +0100, Manfred Spraul wrote:
Bad race.
Unfortuantely the scenario that you describe is quite frequent:
- autoremove_wake_function()
Not a bug, but for very subtile reasons:
There are no writes to the wait_queue structure except the
list_del_init(), and for list_del_init() no memory barriers are required
because finish_wait() uses list_empty_careful(), i.e. the spin_lock() is
only bypassed if both write operations from list_del_init() have completed.
- ipc/sem.c (search for IN_WAKEUP)
fixed in -rc7.
--
Manfred
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