Hi Joel,

Its possible interrupts are disabled. I am using the
termios RTEMS_IO_RCVWAKEUP callback to get chars from console input. I
accumulate them for a timer tick or two, then in a timer callback
do rtems_message_queue_send()

The callstack above this from the rtems_message_queue_receive() in another
task. The disable / enable interrupts wraps the  rtems_message_queue_send()
and buffer management to protect against the timer being invoked again
during that operation.

Should i be using a semaphore instead ?





On 19 February 2018 at 15:38, Joel Sherrill <j...@rtems.org> wrote:

>
> Based on the code, it looks like you have interrupts disabled
> when you are making the call to  rtems_region_get_segment().
>
> For sure, you shouldn't free memory from an ISR though.
>
> On Mon, Feb 19, 2018 at 9:33 AM, Matthew J Fletcher <ami...@gmail.com>
> wrote:
>
>> For those interested the callstack looks like this;
>>
>> bsp_fatal_extension() at bspclean.c:32 0x700d42ba
>> _User_extensions_Iterate() at userextiterate.c:175 0x700ef42a
>> _User_extensions_Fatal() at userextimpl.h:307 0x700eb9b2
>> _Terminate() at interr.c:35 0x700eb9b2
>> _Internal_error() at interr.c:52 0x700eb9e2
>> _Thread_Do_dispatch() at threaddispatch.c:186 0x700edd0a
>> _Thread_Dispatch_enable() at threaddispatch.h:227 0x700ef0f8
>> _Thread_Change_life() at threadrestart.c:684 0x700ef0f8
>> _Thread_Set_life_protection() at threadrestart.c:691 0x700ef10c
>> _API_Mutex_Lock() at apimutexlock.c:29 0x700eae86
>> _RTEMS_Lock_allocator() at allocatormutex.c:26 0x700eae6a
>> _Region_Get_and_lock() at regionimpl.h:76 0x700e9cdc
>> rtems_region_get_segment() at regiongetsegment.c:68 0x700e9cdc
>> ...
>> ... some of my code ...
>> ...
>> _Thread_Handler() at threadhandler.c:134 0x700edde2
>> _Thread_Get() at threadget.c:38 0x700edda8
>>
>> Its not clear to me what the issue might be.
>>
>>
>> On 19 February 2018 at 13:13, Matthew J Fletcher <ami...@gmail.com>
>> wrote:
>>
>>> All,
>>>
>>> Replying to my own post, with CPU_ENABLE_ROBUST_THREAD_DISPATCH set
>>> FALSE i get a fatal exception, this on a Cortex-M7, rtems 5.0.0 from git.
>>>
>>> I think i will have to work around the new behavior somehow.
>>>
>>> --
>>>
>>> regards
>>> ---
>>> Matthew J Fletcher
>>>
>>>
>>
>>
>> --
>>
>> regards
>> ---
>> Matthew J Fletcher
>>
>>
>> _______________________________________________
>> users mailing list
>> users@rtems.org
>> http://lists.rtems.org/mailman/listinfo/users
>>
>
>


-- 

regards
---
Matthew J Fletcher
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