Getting stacktrace for userspace applications on crash(SIGSEGV)

Hi Harish, thank you for replying me :)

Here it is a sample of what I see:

(gdb) bt
#0  0x76e5ed64 in __GI_raise (sig=sig at entry=6)
    at ../nptl/sysdeps/unix/sysv/linux/raise.c:56
#1  0x76e627f8 in __GI_abort () at abort.c:89
#2  0x76831b7c in ?? () from /opt/jdk1.8.0_60/jre/lib/arm/client/libjvm.so
#3  0x76831b7c in ?? () from /opt/jdk1.8.0_60/jre/lib/arm/client/libjvm.so
Backtrace stopped: previous frame identical to this frame (corrupt stack?)


Best regards,

2016-09-09 17:00 GMT-03:00 Harish [off-list ref]:

   My guess is that gdb is failing to walk the Java frames. Could you post what you see in the gdb when you ask for the backtrace? I can possibly try and help then.

Regards,
Harish

quoted

On 10-Sep-2016, at 12:46 AM, Rami Rosen [off-list ref] wrote:

Hi,
Do u know where in the kernel it crashes and can add dump_stack()
there and try ? I used dump_stack() in the past many times and it
worked for me. IIRC, kernel hacking->Kernel debugging was selected in
my kernekl config, and I did not had to to anything else

Regards,
Rami Rosen
http://ramirose.wix.com/ramirosen

quoted

On 9 September 2016 at 21:21, Daniel. [off-list ref] wrote:
Hi everybody,

I'm debugging a library that implement some nasty protocol. This
library is used by some JNI library which exports the native library
to Java world. By the way I'm running on ARMv7.

Well, some times, at random times, that library crashes. The problem
is that I can't get stacktrace. Not from JVM's fatal errors logs, not
from core dumps, not from libSegFault... I'm using "-g -rdynamic
-funwind-tables -mapcs-frame" compiler options but still I can't get a
stacktrace. I've tried using glibc backtrace too. What I don't tried
yet: libunwind, valgrid and making kernel do the stacktrace. The cool
part is that when I ran my library outside from the JVM (with native
application) I do get backtraces! [Damn Java]

I'm here to ask: Is it possible to make kernel print the stacktrace
for some userspace application when it crashes?

I saw USER_STACKTRACE_SUPPORT but can't find any help from it's
Kconfig. I saw this https://kernelnewbies.org/FAQ/StackTrace and this
http://processors.wiki.ti.com/index.php/Enabling_Stack_Dumping_in_Linux_Kernel
but can't find "Kernel hacking -> Verbose kernel error messages" even
with "Kernel hacking -> Kernel Debuggin" enabled.

Any help is appreciated! Thanks !!!

--
"Do or do not. There is no try"
 Yoda Master

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