On 6.3.0SP3 I'm debugging a strange deadlock with process communication on a single node.

I have a thread reply-blocked in MsgSend (thread #19)

# pidin -p 1364182
     pid tid name               prio STATE       Blocked
 1364182   1 het/bin/player.bin  10o MUTEX       1364182-07 #1
 1364182   2 het/bin/player.bin  10o CONDVAR     822849c
 1364182   3 het/bin/player.bin  29o CONDVAR     8216898
 1364182   4 het/bin/player.bin  30o RECEIVE     2
 1364182   5 het/bin/player.bin  10o RECEIVE     2
 1364182   6 het/bin/player.bin  10o RECEIVE     5
 1364182   7 het/bin/player.bin  10o CONDVAR     824609c
 1364182   8 het/bin/player.bin  62o CONDVAR     82445cc
 1364182   9 het/bin/player.bin  10o RECEIVE     21
 1364182  10 het/bin/player.bin  10o CONDVAR     824702c
 1364182  11 het/bin/player.bin  10o CONDVAR     8246de4
 1364182  12 het/bin/player.bin  14o CONDVAR     8246b84
 1364182  13 het/bin/player.bin  14o RECEIVE     25
 1364182  14 het/bin/player.bin  10o CONDVAR     82464b4
 1364182  15 het/bin/player.bin  10o CONDVAR     84e8844
 1364182  16 het/bin/player.bin  10o CONDVAR     84e7754
 1364182  17 het/bin/player.bin  10o CONDVAR     852993c
 1364182  18 het/bin/player.bin  10o CONDVAR     85412dc
 1364182  19 het/bin/player.bin  10o REPLY       1364127
 1364182  20 het/bin/player.bin  10o CONDVAR     854f37c
 1364182  21 het/bin/player.bin  10o CONDVAR     8545c14
 1364182  22 het/bin/player.bin  10o CONDVAR     854e1c4
 1364182  23 het/bin/player.bin  10o CONDVAR     8552ecc
 1364182  24 het/bin/player.bin  10o CONDVAR     8590d6c
 1364182  25 het/bin/player.bin  10o CONDVAR     857bbac
 1364182  26 het/bin/player.bin  10o CONDVAR     857b324
 1364182  27 het/bin/player.bin  30o CONDVAR     82fcf90
 1364182  28 het/bin/player.bin  30o CONDVAR     85a5d30
 1364182  32 het/bin/player.bin  30o CONDVAR     85a1718
 1364182  34 het/bin/player.bin  30o RECEIVE     2
 1364182  35 het/bin/player.bin  30o RECEIVE     2
 1364182  36 het/bin/player.bin  30o RECEIVE     2
 1364182  37 het/bin/player.bin  30o RECEIVE     2
 1364182  38 het/bin/player.bin  30o RECEIVE     2
 1364182  39 het/bin/player.bin  30o RECEIVE     2
 1364182  40 het/bin/player.bin  30o RECEIVE     2
 1364182  41 het/bin/player.bin  10o RECEIVE     2
 1364182  42 het/bin/player.bin  10o MUTEX       1364182-19 #1

The thread is blocked on process 1364127 which is a RM, but it's idle.

# pidin -p 1364127
     pid tid name               prio STATE       Blocked
 1364127   1 rophet/bin/drm.bin  10o MUTEX       1364127-04 #1
 1364127   2 rophet/bin/drm.bin  10o CONDVAR     8170bec
 1364127   3 rophet/bin/drm.bin  10o RECEIVE     2
 1364127   4 rophet/bin/drm.bin  10o RECEIVE     30
 1364127   5 rophet/bin/drm.bin  10o RECEIVE     18
 1364127   6 rophet/bin/drm.bin  10o RECEIVE     18
 1364127   7 rophet/bin/drm.bin  10o RECEIVE     22
 1364127   8 rophet/bin/drm.bin  21o RECEIVE     22
 1364127   9 rophet/bin/drm.bin  10o RECEIVE     26
 1364127  10 rophet/bin/drm.bin  10o RECEIVE     26
 1364127  11 rophet/bin/drm.bin  10o RECEIVE     30
 1364127  12 rophet/bin/drm.bin  10o RECEIVE     38
 1364127  13 rophet/bin/drm.bin  10o RECEIVE     38
 1364127  14 rophet/bin/drm.bin  10o RECEIVE     18
 1364127  15 rophet/bin/drm.bin  10o RECEIVE     26
 1364127  16 rophet/bin/drm.bin  10o RECEIVE     26
 1364127  17 rophet/bin/drm.bin  10o RECEIVE     18
 1364127  18 rophet/bin/drm.bin  10o RECEIVE     26
 1364127  19 rophet/bin/drm.bin  21o RECEIVE     26
 1364127  20 rophet/bin/drm.bin  10o RECEIVE     26
 1364127  21 rophet/bin/drm.bin  10o RECEIVE     26
 1364127  22 rophet/bin/drm.bin  10o RECEIVE     26
 1364127  23 rophet/bin/drm.bin  10o RECEIVE     26
 1364127  24 rophet/bin/drm.bin  10o RECEIVE     26
 1364127  25 rophet/bin/drm.bin  10o RECEIVE     18
 1364127  26 rophet/bin/drm.bin  10o RECEIVE     18
 1364127  27 rophet/bin/drm.bin  10o RECEIVE     18
 1364127  28 rophet/bin/drm.bin ...