Getting stacktrace for userspace applications on crash(SIGSEGV)

[Rami Rosen]

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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