Andrew, here is the patch I promised :)
Everywhere else in the code, we check sma->sem_perm.deleted under
the semaphore array lock, so we should do teh same here.
The easy fix is to simply not drop and re-take the lock, but keep
it locked.
This patch can be folded into ipcsem-fine-grained-locking-for-semtimedop.patch
Signed-off-by: Rik van Riel <r...@redhat.com>
---
ipc/sem.c | 5 ++---
1 file changed, 2 insertions(+), 3 deletions(-)
diff --git a/ipc/sem.c b/ipc/sem.c
index 5711616..efdaee6 100644
--- a/ipc/sem.c
+++ b/ipc/sem.c
@@ -1243,10 +1243,9 @@ static int semctl_main(struct ipc_namespace *ns, int
semid, int semnum,
err = -EIDRM;
goto out_free;
}
- sem_unlock(sma, -1);
- }
+ } else
+ sem_lock(sma, NULL, -1);
- sem_lock(sma, NULL, -1);
for (i = 0; i < sma->sem_nsems; i++)
sem_io[i] = sma->sem_base[i].semval;
sem_unlock(sma, -1);
--
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