From c65b5b47c4c8c6e67e245edc2c918d75f5f2e714 Mon Sep 17 00:00:00 2001 From: Alex Elder Date: Wed, 26 Dec 2012 10:43:57 -0600 Subject: [PATCH] libceph: WARN, don't BUG on unexpected connection states (cherry picked from commit 122070a2ffc91f87fe8e8493eb0ac61986c5557c) A number of assertions in the ceph messenger are implemented with BUG_ON(), killing the system if connection's state doesn't match what's expected. At this point our state model is (evidently) not well understood enough for these assertions to trigger a BUG(). Convert all BUG_ON(con->state...) calls to be WARN_ON(con->state...) so we learn about these issues without killing the machine. We now recognize that a connection fault can occur due to a socket closure at any time, regardless of the state of the connection. So there is really nothing we can assert about the state of the connection at that point so eliminate that assertion. Reported-by: Ugis Tested-by: Ugis Signed-off-by: Alex Elder Reviewed-by: Sage Weil Signed-off-by: Greg Kroah-Hartman --- net/ceph/messenger.c | 11 +++++------ 1 file changed, 5 insertions(+), 6 deletions(-) diff --git a/net/ceph/messenger.c b/net/ceph/messenger.c index d14d3c7900d4..dfaa09e49353 100644 --- a/net/ceph/messenger.c +++ b/net/ceph/messenger.c @@ -561,7 +561,7 @@ void ceph_con_open(struct ceph_connection *con, mutex_lock(&con->mutex); dout("con_open %p %s\n", con, ceph_pr_addr(&addr->in_addr)); - BUG_ON(con->state != CON_STATE_CLOSED); + WARN_ON(con->state != CON_STATE_CLOSED); con->state = CON_STATE_PREOPEN; con->peer_name.type = (__u8) entity_type; @@ -1509,7 +1509,7 @@ static int process_banner(struct ceph_connection *con) static void fail_protocol(struct ceph_connection *con) { reset_connection(con); - BUG_ON(con->state != CON_STATE_NEGOTIATING); + WARN_ON(con->state != CON_STATE_NEGOTIATING); con->state = CON_STATE_CLOSED; } @@ -1635,7 +1635,7 @@ static int process_connect(struct ceph_connection *con) return -1; } - BUG_ON(con->state != CON_STATE_NEGOTIATING); + WARN_ON(con->state != CON_STATE_NEGOTIATING); con->state = CON_STATE_OPEN; con->peer_global_seq = le32_to_cpu(con->in_reply.global_seq); @@ -2132,7 +2132,6 @@ more: if (ret < 0) goto out; - BUG_ON(con->state != CON_STATE_CONNECTING); con->state = CON_STATE_NEGOTIATING; /* @@ -2160,7 +2159,7 @@ more: goto more; } - BUG_ON(con->state != CON_STATE_OPEN); + WARN_ON(con->state != CON_STATE_OPEN); if (con->in_base_pos < 0) { /* @@ -2374,7 +2373,7 @@ static void ceph_fault(struct ceph_connection *con) dout("fault %p state %lu to peer %s\n", con, con->state, ceph_pr_addr(&con->peer_addr.in_addr)); - BUG_ON(con->state != CON_STATE_CONNECTING && + WARN_ON(con->state != CON_STATE_CONNECTING && con->state != CON_STATE_NEGOTIATING && con->state != CON_STATE_OPEN); -- 2.39.5