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
I can only make it halt at pthread_sighandler_rt. To me it seems the attempt
to call the user handler fails, not the call itself
Breakpoint 2, pthread_sighandler_rt (signo=28, si=0x16bd3ac, uc=0x16bd42c) at
libpthread/linuxthreads.old/signals.c:112
112 {
(gdb) next
113 pthread_descr self = thread_self();
(gdb) next
117 if (THREAD_GETMEM(self, p_sigwaiting)) {
(gdb) next
124 in_sighandler = THREAD_GETMEM(self, p_in_sighandler);
(gdb) next
125 if (in_sighandler == NULL)
(gdb) next
126 THREAD_SETMEM(self, p_in_sighandler, CURRENT_STACK_FRAME);
(gdb) next
127 sighandler[signo].rt(signo, si, uc);
(gdb) print signo
$1 = 28
(gdb) print si
$2 = (struct siginfo *) 0x16bd3ac
(gdb) print *si
$4 = {si_signo = 28, si_errno = 0, si_code = -1, _sifields = {_pad = {0, 0, 2, 0
<repeats 26 times>}, _kill = {
si_pid = 0, si_uid = 0}, _timer = {si_tid = 0, si_overrun = 0, si_sigval
= {sival_int = 2, sival_ptr = 0x2}},
_rt = {si_pid = 0, si_uid = 0, si_sigval = {sival_int = 2, sival_ptr =
0x2}}, _sigchld = {si_pid = 0, si_uid = 0,
si_status = 2, si_utime = 0, si_stime = 0}, _sigfault = {si_addr = 0x0},
_sigpoll = {si_band = 0, si_fd = 0}}}
(gdb) print uc
$3 = (struct ucontext *) 0x16bd42c
(gdb) print *uc
$5 = {uc_flags = 0, uc_link = 0x0, uc_stack = {ss_sp = 0x0, ss_flags = 2,
ss_size = 0}, uc_mcontext = {gregs = {0,
23844280, 23844140, 8, 23849124, 28, 23598632, 23844280, 174, 31,
23844140, 23598632, 23640412, 23844464, 23844100,
0, 0, 0, 0, 33562689, 25097346, 24956702, 24956702, 23844112, 23844596,
1, 2, 6, 180, 1, 6146, 91, 0, 0, 0, 0, 311,
192, 2147479552, 0, 0, 1023, 25035906, 24737144, 25035907, 24737185,
393216}}, uc_sigmask = {__val = {2147483648,
0, 0, 0, 0, 23844420, 25097346, 23844280, 0, 0, 0, 8, 0, 0, 23139796, 0
<repeats 17 times>}}}
(gdb) print sighandler[signo]
$2 = {old = <error reading variable>, rt = <error reading variable>}
(gdb) print sighandler
$3 = {{old = <error reading variable>, rt = <error reading variable>} <repeats 24
times>, {
old = @0x204a94: 0x15c965c <xeno_handle_mlock_alert>, rt = @0x204a94: 0x15c965c
<xeno_handle_mlock_alert>}, {
old = <error reading variable>, rt = <error reading variable>} <repeats 40
times>}
(gdb) step
Program received signal SIGSEGV, Segmentation fault.
Kolja
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