[yocto] Debugging question

[Gary Thomas]

On 2017-01-15 13:44, Gary Thomas wrote:
> I'm trying to find a problem I have with recent [master] OE-core.
> In particular, the X server is crashing on launch, so I thought
> I'd run GDB:
>
> root at teton-p0382:~# gdb /usr/bin/X
>    <... boilerplate snipped ...>
> Reading symbols from /usr/bin/X...Reading symbols from /usr/bin/.debug/Xorg...done.
> done.
> (gdb) r
> Starting program: /usr/bin/X
> [Thread debugging using libthread_db enabled]
> Using host libthread_db library "/lib/libthread_db.so.1".
>
> Program received signal SIGILL, Illegal instruction.
> 0xb6f4a8e8 in ?? () from /usr/lib/libcrypto.so.1.0.0
> _armv7_tick () at armv4cpuid.S:94
> 94              mrrc    p15,1,r0,r1,c14         @ CNTVCT
> (gdb) bt
> #0  _armv7_tick () at armv4cpuid.S:94
> #1  0xb6e6c7d4 in OPENSSL_cpuid_setup () from /usr/lib/libcrypto.so.1.0.0
> #2  0xb6fdf34c in call_init (l=<optimized out>, argc=argc at entry=1, argv=argv at entry=0xbefffe14,
>     env=env at entry=0xbefffe1c) at /usr/src/debug/glibc/2.24-r0/git/elf/dl-init.c:72
> #3  0xb6fdf4a8 in call_init (env=<optimized out>, argv=<optimized out>, argc=<optimized out>,
>     l=<optimized out>) at /usr/src/debug/glibc/2.24-r0/git/elf/dl-init.c:30
> #4  _dl_init (main_map=0xb6fff958, argc=1, argv=0xbefffe14, env=0xbefffe1c)
>     at /usr/src/debug/glibc/2.24-r0/git/elf/dl-init.c:120
> #5  0xb6fcfac4 in _dl_start_user () from /lib/ld-linux-armhf.so.3
> Backtrace stopped: previous frame identical to this frame (corrupt stack?)
> (gdb) info sharedlibrary
> From        To          Syms Read   Shared Object Library
> 0xb6fcf800  0xb6feaad4  Yes         /lib/ld-linux-armhf.so.3
> 0xb6fa5538  0xb6fba9c0  Yes (*)     /lib/libudev.so.1
> 0xb6e6c680  0xb6f4af50  Yes (*)     /usr/lib/libcrypto.so.1.0.0
> 0xb6e1792c  0xb6e187e8  Yes         /lib/libdl.so.2
> 0xb6e02800  0xb6e06848  Yes         /usr/lib/libpciaccess.so.0
> 0xb6de807c  0xb6def3d4  Yes         /usr/lib/libdrm.so.2
> 0xb6d5e028  0xb6dce8b0  Yes         /usr/lib/libpixman-1.so.0
> 0xb6d1f9c0  0xb6d42dd4  Yes         /usr/lib/libXfont2.so.2
> 0xb6d0ba00  0xb6d0c5b0  Yes         /usr/lib/libXau.so.6
> 0xb6cf7f80  0xb6cf9614  Yes         /usr/lib/libXdmcp.so.6
> 0xb6c7cd38  0xb6cb0530  Yes         /lib/libm.so.6
> 0xb6c550c0  0xb6c63d74  Yes         /lib/libpthread.so.0
> 0xb6b2b000  0xb6c1d070  Yes         /lib/libc.so.6
> 0xb6b00cfc  0xb6b035dc  Yes         /usr/lib/libfontenc.so.1
> 0xb6a7e6cc  0xb6ad84c4  Yes         /usr/lib/libfreetype.so.6
> 0xb6a588e8  0xb6a649e0  Yes         /lib/libz.so.1
> (*): Shared library is missing debugging information.
>
> Questions
>
> * Any ideas how upgrading the X server now calls into openssl?
>   I've bisected this error down to the change in the X server
>   recipe to v1.19 from v1.18.4
> * What about the illegal instruction?  I'm running on an i.MX6Q
>   which is cortexa9hf-neon
>
> In trying to track this down, I made a patch to the openssl recipe.
> Madness followed as a TON of packages had to be rebuilt and I can't
> see from the dependencies (or recipes) why.  Here's my build log and
> the dependencies for my build.  Maybe someone can point out what went
> so wacky?
>
> Thanks
>

Sorry, wrong build log file :-(

To be clear, I had a completed build which I was debugging.  I only changed
the openssl recipe and rebuilt my image and this log shows all the stuff
that happened.


-- 
------------------------------------------------------------
Gary Thomas                 |  Consulting for the
MLB Associates              |    Embedded world
------------------------------------------------------------
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