| From | Greg Kroah-Hartman <> | Subject | [ 198/221] libceph: WARN, dont BUG on unexpected connection states | Date | Tue, 15 Jan 2013 10:52:05 -0800 |
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3.7-stable review patch. If anyone has any objections, please let me know.
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From: Alex Elder <elder@inktank.com>
(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 <ugis22@gmail.com> Tested-by: Ugis <ugis22@gmail.com> Signed-off-by: Alex Elder <elder@inktank.com> Reviewed-by: Sage Weil <sage@inktank.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org> --- net/ceph/messenger.c | 11 +++++------ 1 file changed, 5 insertions(+), 6 deletions(-)
--- a/net/ceph/messenger.c +++ b/net/ceph/messenger.c @@ -561,7 +561,7 @@ void ceph_con_open(struct ceph_connectio 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_co 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_c 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_conne 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);
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