Mark Scott wrote:
> Seems I spoke too soon. While the segfault was prevented in test mode
> by applying Paul's patch, one occurred at a different place when not
> running in test mode. The backtrace doesn't look that helpful -
> presumably the ?? in non-radioclkd code indicates library calls for
> which debugging info isn't available? The binary used is one compiled
> with the patch applied.
>
> Core was generated by `/usr/sbin/radioclkd ttyS0'.
> Program terminated with signal 11, Segmentation fault.
> #0 0xfffff525000008b3 in ?? ()
> (gdb) backtrace
> #0 0xfffff525000008b3 in ?? ()
> #1 0x000008cb000008d6 in ?? ()
> #2 0xfffff85000000963 in ?? ()
> #3 0x00000f8e0000098e in ?? ()
> #4 0xfffff34a000009cc in ?? ()
> #5 0xffffe0c800000a71 in ?? ()
> #6 0xfffffdf803b6e03a in ?? ()
> #7 0xfffffc6a00000ef2 in ?? ()
> #8 0x00002ba800001128 in ?? ()
> #9 0x0000400600001128 in ?? ()
> #10 0xfffff5df000015b2 in ?? ()
> #11 0x000007b000002c34 in ?? ()
> #12 0x0000000000003053 in ?? ()
> #13 0x0000000000004006 in ?? ()
> #14 0x0000000000004006 in ?? ()
> #15 0x0000000000400e1b in _init ()
> #16 0x0000000000402010 in ProcessTimeCode (c=0xb76000006fd, radio=<value
> optimized out>) at radioclkd.c:709
> #17 0x00007fffeef10cb8 in ?? ()
> #18 0x0000000200000000 in ?? ()
> #19 0x00000000004024e0 in ProcessStatusChange () at radioclkd.c:845
> #20 0x0000000000000000 in ?? ()
>
>
> Line 709 in the patched source is:
>
> if (CalculatePPSAverage(c, &average)<0) {
>
> and line 845 is:
>
> c->correct = 0;
>
> (which seems strange - how can that lead, 3 frames later, to line 845?).
>
> Commenting out the if block surrounding the call to CalculatePPSAverage
> on line 709 and always using the else block instead prevents the
> segfault. The preceding comment "if possible use an averaged offset"
> suggests this is OK (but perhaps less accurate or less efficient? I'm
> making changes now without understanding the implications...).
>
I guess the problem is in the libc qsort call, I pass in an array of
timediff which is int's but tell qsort that it is of size long. Not a
problem on an ia32 machine as the two are the same size. However if they
are different it will cause a problem.
JAB.
--
Jonathan A. Buzzard Email: jonathan (at) buzzard.me.uk
Northumberland, United Kingdom. Tel: +44 1661-832195
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