About HEAP error

[Gedare Bloom]

On Wed, Mar 3, 2021 at 12:08 AM Richi Dubey <richidubey at gmail.com> wrote:
>
> What's the element written after the free? I set a watch at the exact block location, but it doesn't work:
>
> Hardware watchpoint 7: *0x202ba8
> (gdb) watch *0x206fec
> Hardware watchpoint 8: *0x206fec
That's just the first byte in the block. If you can figure out which
bytes/words in the block get accessed that would help you.

> (gdb) c
> Continuing.
>
> Thread 1 hit Breakpoint 6, Init (argument=2107944) at /home/richi/quick-start/LatestStrong/src/rtems/c/src/../../testsuites/sptests/sp02/init.c:26
> 26  TEST_BEGIN();
> (gdb)
> Continuing.
>
> Thread 1 hit Breakpoint 5, _Terminate (the_source=RTEMS_FATAL_SOURCE_HEAP, the_error=2125180) at /home/richi/quick-start/LatestStrong/src/rtems/c/src/../../cpukit/score/src/interr.c:38
> 38  _User_extensions_Fatal( the_source, the_error );
> (gdb)
> Continuing.
>
> Thread 1 hit Breakpoint 4, bsp_reset () at /home/richi/quick-start/LatestStrong/src/rtems/c/src/lib/libbsp/arm/realview-pbx-a9/../../../../../../bsps/arm/realview-pbx-a9/start/bspreset.c:19
> 19  volatile uint32_t *sys_lock = (volatile uint32_t *) 0x10000020;
> (gdb)
>
> On Wed, Mar 3, 2021 at 12:31 PM Sebastian Huber <sebastian.huber at embedded-brains.de> wrote:
>>
>> On 02/03/2021 05:44, Richi Dubey wrote:
>>
>> >
>> > (gdb) p *(Heap_Error_context*)(0x00206d7c)
>> > $5 = {
>> >   heap = 0x202ba8 <_Workspace_Area>,
>> >   block = 0x206fec,
>> >   reason = HEAP_ERROR_FREE_PATTERN
>> > }
>>
>> If it is always the same address, then you can set a watch point to an
>> element which is written after the free to catch the function which
>> writes into this area.
>>
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