Debugging a crash

[Fernando Apesteguía]

On Sun, Jun 30, 2013 at 5:36 PM, Boris Samorodov <bsam at passap.ru> wrote:

> Hi All,
>
> I get an application crashing. Build some libs with debug symbols.
> Here is the gdb log:
> -----
> Program received signal SIGSEGV, Segmentation fault.
> [Switching to Thread 809806400 (LWP 101133/photoprint)]
> strtol_l (nptr=0x0, endptr=0x0, base=10, locale=<value optimized out>)
> at /usr/src/lib/libc/stdlib/strtol.c:73
> 73              } while (isspace_l((unsigned char)c, locale));
> Current language:  auto; currently minimal
> (gdb) bt
> #0  strtol_l (nptr=0x0, endptr=0x0, base=10, locale=<value optimized
>

                        ^^^^

It seems you are passing a NULL str to strtol.



> out>) at /usr/src/lib/libc/stdlib/strtol.c:73
> #1  0x00000008017d951c in ps_parameters (v=0x809d0dc00, name=0x80996c120
> "JCLBOXHOLDTYPE", description=0x7fffffffd0a8) at print-ps.c:380
> #2  0x00000008017996df in stp_describe_parameter (v=0x809d0dc00,
> name=0x80996c120 "JCLBOXHOLDTYPE", description=0x7fffffffd0a8) at
> print-vars.c:1687
> #3  0x000000000046cfd2 in ?? ()
> #4  0x00000000004627a1 in ?? ()
> #5  0x0000000000461da4 in ?? ()
> #6  0x00000000004657fe in ?? ()
> #7  0x0000000000422863 in ?? ()
> #8  0x0000000000421f45 in ?? ()
> #9  0x000000000041054f in ?? ()
> #10 0x0000000800719000 in ?? ()
> #11 0x0000000000000000 in ?? ()
> (gdb) fr 0
> #0  strtol_l (nptr=0x0, endptr=0x0, base=10, locale=<value optimized
> out>) at /usr/src/lib/libc/stdlib/strtol.c:73
> 73              } while (isspace_l((unsigned char)c, locale));
> (gdb) fr 1
> #1  0x00000008017d951c in ps_parameters (v=0x809d0dc00, name=0x80996c120
> "JCLBOXHOLDTYPE", description=0x7fffffffd0a8) at print-ps.c:380
> 380       num_choices = atoi(stp_mxmlElementGetAttr(option,
> "num_choices"));
> (gdb) fr 2
> #2  0x00000008017996df in stp_describe_parameter (v=0x809d0dc00,
> name=0x80996c120 "JCLBOXHOLDTYPE", description=0x7fffffffd0a8) at
> print-vars.c:1687
> 1687      stp_printer_describe_parameter(v, name, description);
> (gdb)
> -----
>
> How should I proceed with debugging? Thanks!
> --
> WBR, Boris Samorodov (bsam)
> FreeBSD Committer, http://www.FreeBSD.org The Power To Serve
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