Corrupt Backtrace
git-dimiz opened this issue · comments
Hi,
I'm trying to integrate your great library into my project. Unfortunately I encounter some problems. My example application looks like this:
void func_3(void)
{
volatile int i = 0;
__builtin_trap();
}
void func_2(void)
{
func_3();
}
void func_1(void)
{
func_2();
}
int main(int argc, char const *argv[])
{
func_1();
return 0;
}
The Crash dump:
63430300
01000000
00000000000000008802002000000000
000000000000000000000000D0FF0320
00000000000000000000032000000000
00000000
D0FF0320
3D0700003207000000000061
B0FF03200000000003000060
00000000000000000000000000000000
00000000000000000000000000000000
00000000000000000000000000000000
00000000000000000000000000000000
00000000000000000000000000000000
00000000000000000000000000000000
00000000000000000000000000000000
00000000000000000000000000000000
00000000
28ED00E03CED00E0
00000100000000400000000034ED00E0
38ED00E0
and the gdb output:
Reading symbols from ./_build/nrf52840_xxaa.out...
Remote debugging using | ./CrashDebug --elf ./_build/nrf52840_xxaa.out --dump crash.txt
0x00000732 in func_3 () at main.c:4
4 volatile int i = 0;
#0 0x00000732 in func_3 () at main.c:4
i = <error reading variable i (Cannot access memory at address 0x2003ffd4)>
Backtrace stopped: Cannot access memory at address 0x2003ffdc
A debugging session is active.
Is there a way to understand the problem in more detail? Why is the stack not fully unwinded until main?
Compiler: Gcc 7.3
MCU: Nordic NRF52840
Compiled with "O0".
It looks like you haven't implemented CrashCatcher_GetMemoryRegions() properly and CrashCatcher isn't dumping the contents of RAM correctly. A sample implementation can be found here. You would need to customize it for your particular microcontroller. I think it should look something like this for the nRF52840:
extern "C" const CrashCatcherMemoryRegion* CrashCatcher_GetMemoryRegions(void)
{
static const CrashCatcherMemoryRegion regions[] = {
{0x20000000, 0x20040000, CRASH_CATCHER_BYTE}
};
return regions;
}What you do see it dump of your call stack is based on the contents of the PC and LR registers. To dump anymore of your call stack will require the contents of RAM, which includes the stack.
I hope that helps.
Yes, the CrashCatcher_GetMemoryRegions function just returned NULL. Because I thought this is sufficient to display the stack trace.
As you recommended I've now implemented the CrashCatcher_GetMemoryRegions function:
const CrashCatcherMemoryRegion* CrashCatcher_GetMemoryRegions(void)
{
static const CrashCatcherMemoryRegion regions[] =
{
{0x2003E000, 0x20040000, CRASH_CATCHER_BYTE}
};
return regions;
}
Now my crash dump looks like this:
63430300
01000000
00000000000000008802002000000000
000000000000000000000000D0FF0320
00000000000000000000032000000000
00000000
D0FF0320
3D0700003207000000000061
B0FF03200000000003000060
00000000000000000000000000000000
00000000000000000000000000000000
00000000000000000000000000000000
00000000000000000000000000000000
00000000000000000000000000000000
00000000000000000000000000000000
00000000000000000000000000000000
00000000000000000000000000000000
00000000
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00000000000000008802002000000000
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0000000000000000000000008F020000
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0000000000000000
0000000000000000
0000000000000000
0000000000000000
0000000000000000
0000000000000000
0000000000000000
0000000000000000
2502000001020000
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00000100000000400000000034ED00E0
38ED00E0
But now I get a different error:
Reading symbols from ./_build/nrf52840_xxaa.out...
Remote debugging using | ./CrashDebug --elf ./_build/nrf52840_xxaa.out --dump crash.txt
ERROR: The dump file failed to load RAM memory region at 0xED55CEAC - 0x00500000.
Encountered unexpected error: 30
Remote connection closed
No stack.
I do not fully understand where the 0xED55CEAC - 0x00500000 addresses are coming from. That is not what the memory region did specify.
It looks like your problem probably started around here in the dump:
ACCE55ED00005000
00000C0010000020
The ACCE55ED bytes in the dump corresponds with the 0xED55CEAC region address noted in your error text. I place this stream of bytes in the dump if I have detected a stack overflow while running the dump code. The CrashCatcher stack is probably not large enough to run your dumping routines. You should try increasing CRASH_CATCHER_STACK_WORD_COUNT to have it work in your environment.
Thank you for the hint. So I think there is something strange happening with the dumpMemoryRegions function
static void dumpMemoryRegions(const CrashCatcherMemoryRegion* pRegion)
{
while (pRegion && pRegion->startAddress != 0xFFFFFFFF)
{
/* Just dump the two addresses in pRegion. The element size isn't required. */
CrashCatcher_DumpMemory(pRegion, CRASH_CATCHER_BYTE, 2 * sizeof(uint32_t));
CrashCatcher_DumpMemory(uint32AddressToPointer(pRegion->startAddress),
pRegion->elementSize,
(pRegion->endAddress - pRegion->startAddress) / pRegion->elementSize);
pRegion++;
}
}
After the first round where it dumped the region 0x2003E000 - 0x20040000 the pRegion->startAddress = 0xED55CEAC and the function continues to dump that stuff. So I don't relay understand why pRegion->startAddress != 0xFFFFFFFF is a valid stop condition.
Ahh now while i was typing I understand.
const CrashCatcherMemoryRegion* CrashCatcher_GetMemoryRegions(void)
{
static const CrashCatcherMemoryRegion regions[] =
{
{0x2003E000, 0x20040000, CRASH_CATCHER_BYTE},
{UINT32_MAX, UINT32_MAX, CRASH_CATCHER_BYTE} /* END OF LIST */
};
return regions;
}
That did the trick :)!
Sorry, that is my fault. Should be:
const CrashCatcherMemoryRegion* CrashCatcher_GetMemoryRegions(void)
{
static const CrashCatcherMemoryRegion regions[] =
{
{0x2003E000, 0x20040000, CRASH_CATCHER_BYTE},
{0xFFFFFFFF, 0xFFFFFFFF, CRASH_CATCHER_BYTE}
};
return regions;
}The 0xFFFFFFFF region is the list terminator.
That did the trick :)!
Excellent. I sent my previous response before seeing your updated one where you figured out the same.