Errors from shared memory functions are ignored

[yurivict]

I had SC failing with "Exception in World_New: Permission denied" on FreeBSD 11.1. ktrace shows that only the third error from shm_* functions was reported to the user:

 16151 scsynth  CALL  shm_unlink(0x803fdb3e0)
 16151 scsynth  NAMI  "/SuperColliderServer_57110"
 16151 scsynth  RET   shm_unlink -1 errno 13 Permission denied
...
 16151 scsynth  CALL  shm_open(0x803fdb3e0,0xa02<O_RDWR|O_CREAT|O_EXCL>,0644<S_IRUSR|S_IWUSR|S_IRGRP|S_IROTH>)
 16151 scsynth  NAMI  "/SuperColliderServer_57110"
 16151 scsynth  RET   shm_open -1 errno 17 File exists
...
 16151 scsynth  CALL  shm_open(0x803fdb3e0,0x2<O_RDWR>,0644<S_IRUSR|S_IWUSR|S_IRGRP|S_IROTH>)
 16151 scsynth  NAMI  "/SuperColliderServer_57110"
 16151 scsynth  RET   shm_open -1 errno 13 Permission denied
 16151 scsynth  CALL  write(0x1,0x803f8d000,0x2a)
 16151 scsynth  GIO   fd 1 wrote 42 bytes
       "Exception in World_New: Permission denied
       "

SC should report every error. It should print what functions failed with what errors. Instead, it only printed the third error in this cryptic form: "Exception in World_New: Permission denied"

Somehow, "/SuperColliderServer_57110" became "undeletable", and this situation occurred. I don't really understand how this is possible.