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| author | dann frazier <dannf@hp.com> | 2008-11-26 15:32:27 -0800 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2008-11-26 15:32:27 -0800 |
| commit | 5f23b734963ec7eaa3ebcd9050da0c9b7d143dd3 (patch) | |
| tree | f82c2265540dd5d32d64f08976cd9b6216842544 /net/unix/af_unix.c | |
| parent | efbbced361f3ff4ff9e85310ccff894185c4d904 (diff) | |
| download | linux-5f23b734963ec7eaa3ebcd9050da0c9b7d143dd3.tar.gz linux-5f23b734963ec7eaa3ebcd9050da0c9b7d143dd3.tar.bz2 linux-5f23b734963ec7eaa3ebcd9050da0c9b7d143dd3.zip | |
net: Fix soft lockups/OOM issues w/ unix garbage collector
This is an implementation of David Miller's suggested fix in:
https://bugzilla.redhat.com/show_bug.cgi?id=470201
It has been updated to use wait_event() instead of
wait_event_interruptible().
Paraphrasing the description from the above report, it makes sendmsg()
block while UNIX garbage collection is in progress. This avoids a
situation where child processes continue to queue new FDs over a
AF_UNIX socket to a parent which is in the exit path and running
garbage collection on these FDs. This contention can result in soft
lockups and oom-killing of unrelated processes.
Signed-off-by: dann frazier <dannf@hp.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net/unix/af_unix.c')
| -rw-r--r-- | net/unix/af_unix.c | 2 |
1 files changed, 2 insertions, 0 deletions
diff --git a/net/unix/af_unix.c b/net/unix/af_unix.c index eb90f77bb0e2..66d5ac4773ab 100644 --- a/net/unix/af_unix.c +++ b/net/unix/af_unix.c @@ -1343,6 +1343,7 @@ static int unix_dgram_sendmsg(struct kiocb *kiocb, struct socket *sock, if (NULL == siocb->scm) siocb->scm = &tmp_scm; + wait_for_unix_gc(); err = scm_send(sock, msg, siocb->scm); if (err < 0) return err; @@ -1493,6 +1494,7 @@ static int unix_stream_sendmsg(struct kiocb *kiocb, struct socket *sock, if (NULL == siocb->scm) siocb->scm = &tmp_scm; + wait_for_unix_gc(); err = scm_send(sock, msg, siocb->scm); if (err < 0) return err; |