Getting stacktrace for userspace applications on crash(SIGSEGV)

[Harish]

   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

> On 10-Sep-2016, at 12:46 AM, Rami Rosen <roszenrami at gmail.com> 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
> 
> 
>> On 9 September 2016 at 21:21, Daniel. <danielhilst at gmail.com> 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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