[Xenomai-help] problem with libanalogy

["Alessio Margan]

Hi,

I've got "Segmentation fault" from libanalogy.so.1
Here is part of code ...

int s526Analogy::Open()
{
int ret = 0;
boardIsOpen = false;

ret = a4l_open(&dsc, dev_name);
if (ret < 0) {
fprintf(stderr, "s526Analogy::Open : a4l_open %s failed (ret=%d)\n", 
dev_name, ret);
return boardIsOpen;
}

fprintf(stderr, "s526Analogy::Open : name : %s\nsubd %d\nrd subd %d\nwr 
subd %d\nfd %d\nmagic %x\nsize %d\n",
dsc.board_name,
dsc.nb_subd,
dsc.idx_read_subd,
dsc.idx_write_subd,
dsc.fd,
dsc.magic,
dsc.sbsize);

dsc.sbdata = malloc(dsc.sbsize);
if (dsc.sbdata == NULL) {
ret = -ENOMEM;
fprintf(stderr, "s526Analogy::Open : info buffer allocation failed\n");
return boardIsOpen;
}
ret = a4l_fill_desc(&dsc);
if (ret < 0) {
fprintf(stderr, "s526Analogy::Open : a4l_fill_desc failed (ret=%d)\n", ret);
return boardIsOpen;
}

boardIsOpen = true;
printf("Open %s\n", dev_name);

return boardIsOpen;
}

and here is the back trace from gdb ....

s526Analogy::Open : name : analogy_s526
subd 4
rd subd 1
wr subd 2
fd 0
magic 1234abcd
size 1560

Program received signal SIGSEGV, Segmentation fault.
[Switching to Thread 0xb7151990 (LWP 6138)]
0xb773a64a in a4l_sys_desc () from /usr/xenomai/lib/libanalogy.so.1
Current language: auto; currently asm
(gdb) bt
#0 0xb773a64a in a4l_sys_desc () from /usr/xenomai/lib/libanalogy.so.1
#1 0xb773a748 in a4l_fill_desc () from /usr/xenomai/lib/libanalogy.so.1
#2 0x0804ebb2 in s526Analogy::Open (this=0x805e560) at s526Analogy.cpp:55
#3 0x0804f8c6 in configure_board () at s526Main.cpp:95
#4 0x0804f96a in main () at s526Main.cpp:115
(gdb)

dmesg give me ...

app[6454]: segfault at 40 ip b772964a sp bfd372d0 error 4 in 
libanalogy.so.1.0.0[b7728000+3000]


Yesterday I pull xenomai-head to get last commits, before I've run the 
application without this segfault.

TIA

Alessio


-- 

ISTITUTO ITALIANO
DI TECNOLOGIA

Alessio Margan
/Senior Technician/
mail me <mailto:alessio.margan@domain.hid>

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