[Discuss-gnuradio] gnuradio on ARM: gr_vmcircbuf_sysv_shm: shmat (3): Invalid argument

[Monahan-Mitchell, Tim]

gnuradio maint branch, v.3.6.4.1

'make test' fails, due to gr-core-test-all failing.

At first, I was getting an error due to the "shmat (2)" line above where this 
error occurs, but it has settled on (3).
I added a couple lines of extra debug output (source code is below the error 
output).

test 6
        Start   6: gr-core-test-all

6: Test command: /bin/sh 
"/src/gnuradio/build/gnuradio-core/src/tests/gr-core-test-all_test.sh"
6: Test timeout computed to be: 9.99988e+06
6: Testing gr_vmcircbuf_createfilemapping_factory...
6: gr_vmcircbuf_createfilemapping: createfilemapping is not available
6: ....... gr_vmcircbuf_createfilemapping_factory: Doesn't work
6: Testing gr_vmcircbuf_sysv_shm_factory...
6: gr_vmcircbuf_sysv_shm: shmat (3): Invalid argument
6: gr_vmcircbuf_sysv_shm: shmid1=163842, first_copy+pagesize=0x40039000
6: ....... gr_vmcircbuf_sysv_shm_factory: Doesn't work
6: Testing gr_vmcircbuf_mmap_shm_open_factory...
6: ....... gr_vmcircbuf_mmap_shm_open_factory: OK
6: Testing gr_vmcircbuf_mmap_tmpfile_factory...
6: ....... gr_vmcircbuf_mmap_tmpfile_factory: OK
6: ...........................NOTICE: test from c++ NOTICE
6: DEBUG: test from c++ DEBUG
6: INFO: test from c++ INFO
6: WARN: test from c++ WARN
6: ERROR: test from c++ ERROR
6: FATAL: test from c++ FATAL
6: .....Using Volk machine: generic

Snippet from gr_vmcircbuf_sysv_shm.cc :

  // There may be a race between our detach and attach.
  //
  // If the system allocates all shared memory segments at the same
  // virtual addresses in all processes and if the system allocates
  // some other segment to first_copy or first_copoy + size between
  // our detach and attach, the attaches below could fail [I've never
  // seen it fail for this reason].

  //shmdt (first_copy);

  if (shmdt (first_copy) == -1){
    perror("gr_vmcircbuf_sysv_shm: shmdt (a)"); // Debug line added
  }

  // first read-only guard page
  if (shmat (shmid_guard, first_copy, SHM_RDONLY) == (void *) -1){
    perror ("gr_vmcircbuf_sysv_shm: shmat (2)");
    fprintf (stderr, "gr_vmcircbuf_sysv_shm: shmid_guard=%d, 
first_copy=0x%x\n", shmid_guard, (unsigned int) first_copy);
    shmctl (shmid_guard, IPC_RMID, 0);
    shmctl (shmid1, IPC_RMID, 0);
    throw std::runtime_error ("gr_vmcircbuf_sysv_shm");
  }

  // first copy
  if (shmat (shmid1, (char *) first_copy + pagesize, 0) == (void *) -1){
    perror ("gr_vmcircbuf_sysv_shm: shmat (3)");
    fprintf (stderr, "gr_vmcircbuf_sysv_shm: shmid1=%d, 
first_copy+pagesize=0x%x\n", shmid1, (unsigned int) ((char *) first_copy + 
pagesize));
    shmctl (shmid_guard, IPC_RMID, 0);
    shmctl (shmid1, IPC_RMID, 0);
    shmdt (first_copy);
    throw std::runtime_error ("gr_vmcircbuf_sysv_shm");
  }

On an earlier test run where the shmat (2) line failed, this was the debug 
output from the above code:

6: Testing gr_vmcircbuf_sysv_shm_factory...
6: gr_vmcircbuf_sysv_shm: shmat (2): Invalid argument
6: gr_vmcircbuf_sysv_shm: shmid_guard=98304, first_copy=0x400e9000

Not sure how this will affect my system. Posting this more of an FYI.

I can add more details about the build if needed.