On Mon, 29 Feb 2016, Michal Hocko wrote:
From: Michal Hocko <mhocko@xxxxxxxx>
shmat and shmdt rely on mmap_sem for write. If the waiting task
gets killed by the oom killer it would block oom_reaper from
asynchronous address space reclaim and reduce the chances of timely
OOM resolving. Wait for the lock in the killable mode and return with
EINTR if the task got killed while waiting.
Cc: Davidlohr Bueso <dave@xxxxxxxxxxxx>
Cc: Hugh Dickins <hughd@xxxxxxxxxx>
Signed-off-by: Michal Hocko <mhocko@xxxxxxxx>
I have no objection to this perse, just one comment below.
Acked-by: Davidlohr Bueso <dave@xxxxxxxxxxxx>
---
ipc/shm.c | 9 +++++++--
1 file changed, 7 insertions(+), 2 deletions(-)
diff --git a/ipc/shm.c b/ipc/shm.c
index 331fc1b0b3c7..b8cfa05940d2 100644
--- a/ipc/shm.c
+++ b/ipc/shm.c
@@ -1200,7 +1200,11 @@ long do_shmat(int shmid, char __user *shmaddr, int shmflg, ulong *raddr,
if (err)
goto out_fput;
- down_write(¤t->mm->mmap_sem);
+ if (down_write_killable(¤t->mm->mmap_sem)) {
+ err = -EINVAL;
+ goto out_fput;
+ }
This should be EINTR, no?
Thanks,
Davidlohr
+
if (addr && !(shmflg & SHM_REMAP)) {
err = -EINVAL;
if (addr + size < addr)
@@ -1271,7 +1275,8 @@ SYSCALL_DEFINE1(shmdt, char __user *, shmaddr)
if (addr & ~PAGE_MASK)
return retval;
- down_write(&mm->mmap_sem);
+ if (down_write_killable(&mm->mmap_sem))
+ return -EINTR;
/*
* This function tries to be smart and unmap shm segments that
--
2.7.0
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