Kolja Waschk wrote:
>> Some Xenomai code is executed before the main function is called. What I
>> do not understand is why gdb does not stop at the place of the segfault?
>
> One step further. After issuing "sharedlibrary" the syms are read. The
> backtrace then is
>
> #0 0x01666f10 in pthread_sighandler_rt (signo=28, si=0x13bd374, uc=0x13bd3f4)
> at libpthread/linuxthreads.old/signals.c:127
> #1 <signal handler called>
> #2 0x0160cf1e in __syscall_rt_sigaction (signum=<value optimized out>,
> act=0x13bd580, oldact=0x13bd4f4, size=8)
> at libc/sysdeps/linux/common/__syscall_rt_sigaction.c:17
> #3 0x0162f482 in __libc_sigaction (sig=28, act=0x13bd638, oact=0xb8995c) at
> libc/signal/sigaction.c:58
> #4 0x01666fba in *___GI_sigaction (sig=28, act=0x13bd6e8, oact=0xb8995c) at
> libpthread/linuxthreads.old/signals.c:163
> #5 0x00b71c9a in xeno_sigshadow_install () at
> ../../../../xenomai-2.5.5.2/src/skins/common/sigshadow.c:70
> #6 0x01665f66 in __pthread_once (once_control=0xb89958,
> init_routine=@0x1545bc4: 0xb71c64 <xeno_sigshadow_install>)
> at libpthread/linuxthreads.old/mutex.c:315
> #7 0x016c4132 in __wrap_pthread_setschedparam (thread=1024, policy=0,
> param=0x13bf9c8)
> at ../../../../xenomai-2.5.5.2/src/skins/posix/thread.c:71
> #8 0x016c376a in __init_posix_interface () at
> ../../../../xenomai-2.5.5.2/src/skins/posix/init.c:90
> #9 0x016c8234 in __do_global_ctors_aux ()
> from
> /opt/uClinux-2010R1-RC5_tools-RC4/blackfin-linux-dist/staging/usr/lib/libpthread_rt.so.1
> #10 0x016c2cb6 in _init () from
> /opt/uClinux-2010R1-RC5_tools-RC4/blackfin-linux-dist/staging/usr/lib/libpthread_rt.so.1
> #11 0x019c41b6 in _dl_get_ready_to_run (tpnt=0xb8836c, load_addr=<value
> optimized out>, auxvt=0x13bfda0, envp=0x13bfe6c,
> argv=0x13bfe64, dl_boot_progmap=0x13bff40, dl_boot_got_pointer=21056480)
> at ldso/ldso/ldso.c:836
> #12 0x019c44a4 in ?? ()
> from
> /opt/uClinux-2010R1-RC5_tools-RC4/bfin-linux-uclibc/bfin-linux-uclibc/runtime/lib/ld-uClibc.so.0
> #13 0x019c0cb0 in _dl_boot () at ./ldso/ldso/bfin/dl-inlines.h:31
> Cannot access memory at address 0x16ffc78
First, you should print the stack pointer, and cat /proc/$pid/map while
the process is stopped inside gdb, to see if you would not have a stack
overflow.
If not, recompile xenomai with --enable-debug, try and put a breakpoint
on the function xeno_sigshadow_handler. If you hit the breakpoint, try
and execute the function step by step, looking whether a pointer could
be invalid.
--
Gilles.
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